TWI775217B - Electronic circuit breaker and circuit breaker system - Google Patents

Abstract

An electronic circuit breaker (1) of the present invention includes a load current characteristic calculation portion (17) and an output portion (20). The load current characteristic calculation portion (17) calculates a short time-limit load current characteristic that is a load current characteristics in a short time-limit zone based on a peak value calculated by a peak value calculation portion (12), and calculates a long time-limit load current characteristic that is a load current characteristics in a long time-limit zone based on an effective value calculated by an effective value calculation portion (13). The output portion (20) outputs information of load current characteristics including the short time-limit load current characteristic and the long time-limit load current characteristic calculated by the load current characteristic calculation portion (17).

Description

Electronic circuit breakers and circuit breaker systems

The present invention relates to an electronic circuit breaker and a circuit breaker system.

In the conventional technology, an electronic circuit breaker provided with a microcomputer or the like can change the overcurrent tripping operation characteristics. Therefore, when a load device is added or the operation mode of the load device is changed after the electronic circuit breaker is installed, the installed electronic circuit breaker can continue to be used without replacement by changing the overcurrent tripping action characteristics.

The setting of the overcurrent tripping action characteristics The operator estimates the load current of the current flowing through the load based on the product specifications of all the load equipment connected to the electronic circuit breaker that constitutes the load. Then, the operator sets the overcurrent tripping operation characteristic with a margin slightly larger than the load current.

However, the above-mentioned work requires estimation of the load current based on the product specification of the load device, and for this purpose, a technique has been developed to facilitate the setting of the overcurrent tripping operation characteristics. For example, the following Patent Document 1 discloses an electronic circuit breaker in which the maximum energization duration for each load current value is measured, and based on the measurement results, a characteristic representing the relationship between the load current value and the maximum energization duration is calculated as Maximum load time limit characteristic. The electronic circuit breaker system will include the maximum load time limit feature and overcurrent tripping The characteristic information of the tripping action characteristic is displayed on the display unit, which enables the change of the overcurrent tripping action characteristic. Thereby, the electronic circuit breaker described in Patent Document 1 can easily set the overcurrent tripping operation characteristics.

(prior art literature) (patent literature)

Patent Document 1: Japanese Patent Laid-Open No. 2010-93946

However, in the electronic circuit breaker described in the aforementioned Patent Document 1, the current product is calculated by multiplying the effective value of the load current by the sampling period, and the overcurrent is detected using the current accumulated value obtained by accumulating the current product. Therefore, in the electronic circuit breaker described in Patent Document 1, for example, when the load is a generator, even if a short-term overcurrent is detected due to the flow of the starting current of the generator and the circuit is disconnected, the maximum load time-limited characteristic is present. There are cases where the value specified by the short-time operating characteristics in the overcurrent tripping operating characteristics is not exceeded, and the overcurrent tripping operating characteristics cannot be properly implemented.

The present invention has been developed in view of the above-mentioned circumstances, and aims to obtain an electronic circuit breaker capable of appropriately performing overcurrent tripping action characteristics for users.

In order to solve the above-mentioned problems and achieve the object, the electronic circuit breaker system of the present invention includes an opening and closing contact, a tripping device, a current detection unit, a peak value calculation unit, an effective value calculation unit, a short-time trip processing unit, and a long-time trip A processing unit, a load current characteristic calculation unit, and an output unit. The switch contacts open and close the line between the power supply and the load. The tripping device changes the open and closed contacts from the closed state to the open state. Current Detection The part detects the current flowing through the line. The peak value calculation unit calculates the peak value of the current detected by the current detection unit. The effective value calculation unit calculates the effective value of the current detected by the current detection unit. The short-time trip processing unit uses a trip device to change the open-close contact from the closed state to the open state when it is determined that there is an overcurrent flowing in the line in the short-time area based on the peak value calculated by the peak value calculation unit. The long-time trip processing unit uses the trip device to open and close the contact when it is determined that there is an overcurrent flowing in the line in the area belonging to the long-time period that is longer than the short-time period, based on the effective value calculated by the effective value calculation unit. From closed state to open state. The load current characteristic calculating unit calculates the current characteristic of the load in the short-time region, that is, the short-time load current characteristic, based on the peak value calculated by the peak value calculating unit, and calculates the long-term load current characteristic based on the effective value calculated by the effective value calculating unit. The current characteristic of the load in the time-limited region is the long-time load current characteristic. The output unit outputs load current characteristic information including the short-time load current characteristic and the long-time load current characteristic calculated by the load current characteristic calculation unit.

According to the present invention, the effect that the user can properly implement the overcurrent tripping action characteristic can be achieved.

1: Electronic circuit breaker

2: Power

3: load

3 ₁ : Electrical Machines

3 ₂ : Electrical equipment

4,4 ₁ ~4 ₃ : Open and close contacts

5: tripping device

6,6 ₁ ~6 ₃ : line

7: Current detection section

8 ₁ ~8 ₃ : Comparator

9: Voltage conversion section

10: Processing Department

11: AD conversion section

12: Peak calculation section

13: Effective value calculation section

14: Instantaneous trip processing section

15: Short-time trip processing department

16: Long time limit trip processing section

17: Load current characteristic calculation part

18: Advance Alert Handling Department

19,62: Suggested value calculation section

20: Output part

21,51: Department of Communications

22: Setting section

23,55: Memory Department

30: trip circuit

31,53: Input section

32: Reporting Department

50: Information processing device

52: Display part

54: Control Department

60: Display processing part

61: Setting processing section

70: Update image

71: Characteristic display area

72: Now set value display area

73: Block display area

74: Setting value change bar

75: Get button

76: Suggested value calculation button

77: Suggested value setting button

78: Update button

79: Write button

100: Circuit Breaker System

101: Processor

102: Memory

103: AD Converter

104: Input and output interface

105: Communication device

106: Busbar

S: trip signal

FIG. 1 is a diagram showing a configuration example of a circuit breaker system according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing the overcurrent tripping action characteristic and the pre-alarm action characteristic of Embodiment 1. FIG.

FIG. 3 is a diagram showing an example of the configuration of the information processing apparatus according to the first embodiment.

FIG. 4 is a diagram showing an example of characteristic information displayed in the information processing apparatus of Embodiment 1. FIG.

FIG. 5 is a diagram showing another example of characteristic information displayed in the information processing apparatus of the first embodiment.

FIG. 6 is a flowchart showing an example of processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1. FIG.

FIG. 7 is a diagram showing an example of the overcurrent tripping action characteristic of the electronic circuit breaker of Embodiment 1. FIG.

FIG. 8 is a flowchart showing an example of short-time counter processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1. FIG.

9 is a flowchart showing an example of the load current characteristic calculation process performed by the processing unit of the electronic circuit breaker according to the first embodiment.

FIG. 10 is a flowchart showing an example of TxP update processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1. FIG.

FIG. 11 is a diagram showing an example of the load current when the load of Embodiment 1 is a generator.

FIG. 12 is a diagram for explaining the TxP update process in the first cycle shown in FIG. 11 .

FIG. 13 is a diagram for explaining the TxP update process in the second cycle shown in FIG. 11 .

FIG. 14 is a diagram for explaining the TxP update process in the third cycle shown in FIG. 11 .

FIG. 15 is a diagram for explaining the TxP update process in the fourth cycle shown in FIG. 11 .

FIG. 16 is a diagram for explaining the TxP update process in the fifth cycle shown in FIG. 11 .

FIG. 17 is a diagram for explaining the TxP update process in the sixth cycle shown in FIG. 11 .

FIG. 18 is a diagram for explaining the TxP update process in the seventh cycle shown in FIG. 11 .

FIG. 19 is a diagram for explaining the TxP update process of the 99th cycle shown in FIG. 11 .

FIG. 20 is a diagram for explaining the TxS update processing in the first cycle and the second cycle shown in FIG. 11 .

FIG. 21 is a diagram for explaining the TxS update processing in the third cycle and the fourth cycle shown in FIG. 11 .

FIG. 22 is a diagram for explaining the TxS update processing in the fifth cycle and the sixth cycle shown in FIG. 11 .

FIG. 23 is a diagram for explaining the TxS update processing of the 7th cycle and the 99th cycle shown in FIG. 11 . picture.

FIG. 24 is a diagram showing an example of the hardware configuration of the processing unit of the electronic circuit breaker according to the first embodiment.

Hereinafter, the electronic circuit breaker and the circuit breaker system according to the embodiments of the present invention will be described in detail with reference to the drawings. In addition, the present invention is not limited to the following embodiments.

Implementation type 1.

FIG. 1 is a diagram showing a configuration example of a circuit breaker system according to Embodiment 1 of the present invention. As shown in FIG. 1 , the circuit breaker system 100 of the first embodiment includes an electronic circuit breaker 1 and an information processing device 50 . The information processing device 50 is, for example, a mobile device such as a smart phone, a tablet computer, or a notebook computer. The electronic circuit breaker 1 and the information processing device 50 are communicatively connected to each other by short-range wireless communication such as Bluetooth (registered trademark).

The electronic circuit breaker 1 connects and disconnects a three-phase three-wire line 6 that connects the power source 2 and the load 3 . Here, the line 6 connecting the power source 2 and the load 3 is not limited to a three-phase three-wire line, and may be, for example, a single-phase two-wire line, a single-phase three-wire line, or a three-phase four-wire line. In the example shown in FIG. 1 , the load 3 includes electrical equipment 3 ₁ and electrical equipment 3 ₂ , but the load 3 is not limited to the example shown in FIG. 1 .

The electronic circuit breaker 1 includes a switch contact 4 that opens and closes the line 6 , a trip device 5 that changes the switch contact 4 from a closed state to an open state, and a load current that detects a current flowing to the load 3 via the line 6 . the current detection section 7. The switch contact 4 has switch contacts 4 ₁ to 4 ₃ , and the switch contacts 4 ₁ to 4 ₃ respectively open and close the corresponding circuit among the three circuits 6 ₁ to 6 ₃ constituting the circuit 6 .

Each of the opening and closing contacts 41 to ₄₃ has _a fixed contact (not shown) and a movable contact (not shown). When the movable contacts of the switch contacts 4 ₁ to 4 ₃ come into contact with the fixed contacts to be in a closed state, the power source 2 provided in connection with the electronic circuit breaker 1 is electrically connected to the load 3 . Thereby, the electronic circuit breaker 1 is brought into an on state, and current flows through the lines 6 ₁ to 6 ₃ .

In addition, when the movable contact of each of the switch contacts 41 to ₄₃ is separated from the fixed contact, the switch contact ₄ is changed from the closed state to the open state, and the power supply 2 and the load 3 are electrically disconnected. Thereby, the electronic circuit breaker ₁ is brought into an off state, and the current of each of the lines 61 to ₆₃ is interrupted.

The current detection unit 7 is provided with a plurality of current comparators 8 ₁ to 8 ₃ , and outputs an analog current signal proportional to the instantaneous value of the load current flowing through the corresponding line among the lines 6 ₁ to 6 ₃ , and a voltage, respectively. The converting unit ₉ converts the plurality of analog current signals output by the current converters 81 to 83 into _a plurality of analog voltage signals.

Further, the electronic circuit breaker 1 includes a processing unit 10 , a trip circuit 30 , an input unit 31 , and a notification unit 32 . The processing unit 10 has information on the overcurrent tripping operation characteristic which is an overcurrent detection characteristic, and determines whether or not the load current detected by the current detecting unit 7 is an overcurrent based on the overcurrent tripping operation characteristic. When the processing unit 10 determines that the load current is an overcurrent, it outputs the trip signal S to the trip circuit 30 .

For example, when the trip circuit 30 receives the trip signal S output from the processing unit 10, the trip device 5 is driven so that the trip device 5 executes the trip operation. The tripping action is an action that changes the switch contact 4 from the closed state to the open state. The input unit 31 includes a plurality of knobs for setting the information of the overcurrent tripping action characteristic and the advance warning action characteristic, a measurement start button for allowing the processing unit 10 to calculate the load current time-limited characteristic described later, and the like. The notification unit 32 includes, for example, any one of a speaker, an indicator light, or a display unit, and issues an advance warning by sound, light, or image in accordance with a request from the processing unit 10 .

The processing unit 10 is based on information having a pre-alert action characteristic, and acts according to the pre-alarm. As a characteristic, it is determined whether or not the load current detected by the current detection unit 7 is in a state in which an advance warning should be issued. The processing unit 10 outputs an advance alarm when it is determined that the load current is in a state in which an advance alarm should be performed.

Here, the overcurrent tripping action characteristic and the advance warning action characteristic will be described. FIG. 2 is a diagram showing the overcurrent tripping action characteristic and the pre-alarm action characteristic of Embodiment 1. FIG. In Fig. 2, the horizontal axis represents the load current, and the vertical axis represents the operation time.

The overcurrent tripping action characteristic is a characteristic showing the relationship between the overcurrent judgment threshold value and the tripping action time for determining whether or not an overcurrent is flowing. The overcurrent tripping action characteristics of the electronic circuit breaker 1 include instantaneous tripping characteristics, short-time tripping characteristics, and long-time tripping characteristics. Instantaneous tripping characteristic is to specify the overcurrent judgment threshold value for the instantaneous tripping action of the tripping action in the instantaneous tripping area. The short-time tripping characteristic is to specify the overcurrent judgment threshold value for the short-time tripping action of the tripping action in the short-time tripping area. The long-time tripping characteristic defines the overcurrent judgment threshold for the long-time tripping action of the tripping action in the long-time tripping area. In addition, in the following, there may be cases where the short-time escape area is described as a short-time area, and the long-time escape area is described as a long-time area.

The pre-alarm operation characteristic is a characteristic showing the relationship between the pre-alarm threshold value smaller than the overcurrent judgment threshold value and the pre-alarm operation time. Output an alarm. Since this alarm is performed before the overcurrent flows through the line 6, it is called a pre-event alarm.

In Figure 2, in addition to the overcurrent tripping action characteristic and the pre-alarm action characteristic, it also shows the maximum load current time limit characteristic. The maximum load current time limit characteristic is the load current time limit characteristic obtained by measuring the load current value during the period when the load current becomes the maximum, and shows the relationship between each load current value and the maximum energization time. The load current time limit characteristic represents the relationship between each load current value and the energization time. characteristics of the system. The energization time is the time compared with the action time of the overcurrent tripping action characteristic. When the energization time exceeds the action time specified by the overcurrent tripping action characteristic, the electronic circuit breaker 1 performs the tripping action.

Returning to FIG. 1 , the processing unit 10 of the electronic circuit breaker 1 will be described. The processing unit 10 includes: an analog-to-digital (AD) conversion unit 11 , a peak value calculation unit 12 , an effective value calculation unit 13 , an instantaneous trip processing unit 14 , a short-time trip processing unit 15 , and a long-time trip The removal processing unit 16 , the load current characteristic calculation unit 17 , the advance warning processing unit 18 , the advice value calculation unit 19 , the output unit 20 , the communication unit 21 , the setting unit 22 , and the memory unit 23 .

The AD conversion unit 11 converts each of the plurality of analog voltage signals output from the current detection unit 7 into digital signals every predetermined period T1 . The digital signal contains a digital value representing the instantaneous value of the load current. The period T1 is, for example, 1 [ms; milliseconds]. The AD conversion unit 11 outputs the converted plural digital signals to the peak value calculation unit 12 , the effective value calculation unit 13 , and the instantaneous trip processing unit 14 .

The peak value calculation unit 12 detects the peak value of the load current flowing through the line 6, that is, the load current peak value Ipeak, based on the plurality of digital signals output from the AD conversion unit 11 every predetermined period T2. The period T2 is, for example, 20 [ms].

The peak value calculation unit 12 calculates the peak value of the maximum value of the instantaneous value of the load current in a preset period T3 as the load current peak value Ipeak based on, for example, a plurality of digital signals output from the AD conversion unit 11 . When the frequency of the AC voltage output from the power source 2 is 50 [Hz], the period T3 is, for example, 20 [ms].

In addition, the effective value calculation unit 13 calculates the effective value of the load current flowing through the line 6, that is, the effective value of the load current Irms, based on the plurality of digital signals output from the AD conversion unit 11 every period T2. For example, the effective value calculation unit 13 calculates the value included in the digital signal output from the AD conversion unit 11 . The value obtained by squaring the instantaneous value of the load current is taken as a moving average, and the effective value of the load current Irms can be obtained by calculating the square root of the result of the moving average.

The instantaneous trip processing unit 14 determines whether or not the instantaneous value of the load current flowing through the line 6 exceeds the overcurrent determination threshold defined by the instantaneous trip operation characteristic, based on the plurality of digital signals output from the AD conversion unit 11 in each period T1. limit. When the instantaneous trip processing unit 14 determines that the instantaneous value of the load current flowing in the line 6 exceeds the overcurrent determination threshold value, the trip signal S is output from the output unit 20 to the trip circuit 30 .

The short-time trip processing unit 15 determines whether an overcurrent flows through the line 6 in the short-time region based on the load current peak value Ipeak. Specifically, the short-time trip processing unit 15 outputs the trip signal S from the output unit 20 when the load current peak value Ipeak in each period T2 exceeds the overcurrent determination threshold value defined by the short-time trip characteristic. to trip circuit 30.

The long-time trip processing unit 16 determines whether an overcurrent flows through the line 6 in the long-time area based on the effective value Irms of the load current. Specifically, the long-time trip processing unit 16 sends the trip signal S from the output unit 20 when the load current effective value Irms in each period T2 exceeds the overcurrent determination threshold value defined by the long-time trip characteristic. Output to trip circuit 30 . In addition, the long-time trip processing unit 16 can also determine whether there is an overcurrent flowing through the line 6 in the long-time region according to the load current effective value Irms and the load current peak value Ipeak.

The load current characteristic calculation unit 17 calculates a load current time-limit characteristic that represents the relationship between the load current and the energization time. The load current characteristic calculation unit 17 can calculate the maximum load current time-limit characteristic representing the relationship between the load current and the maximum conduction time by measuring the load current value during the period when the load current becomes the maximum.

According to the load current peak value Ipeak, calculate the load current time limit in the short-time region The characteristic is the short-time load current characteristic. In addition, the load current characteristic calculating unit 17 calculates the long-time load current characteristic, which is the load current time-limit characteristic in the long-time area, based on the load current effective value Irms. The short-time load current characteristic is the characteristic of the relationship between the load current in the short-time area and the energization time, and the long-time load current characteristic is the characteristic of the relationship between the load current in the long-time area and the energization time.

In this way, the load current characteristic calculating unit 17 calculates the short-time load current characteristic based on the load current peak value Ipeak used for the trip determination in the short-time trip processing unit 15 , and uses the short-time trip processing unit 16 for tripping The determined load current effective value Irms is used to calculate the long-term load current characteristics. In this way, the electronic circuit breaker 1 can prompt the user to obtain the load current time limit characteristic integrated with the overcurrent tripping action characteristic, so the user can appropriately implement the overcurrent tripping action characteristic.

The load current characteristic calculation unit 17 calculates the long-time load current characteristic and the short-time load current characteristic when the user operates the measurement start button of the input unit 31 . The user can operate the measurement start button at the start timing of the period in which the load current is at the maximum, thereby causing the load current characteristic calculation unit 17 to calculate the maximum load current time-limit characteristic. The load current characteristic calculation unit 17 associates the calculated information of the load current time-limited characteristic with the information of the measurement period, and stores it in the memory unit 23 . Here, the storage unit 23 stores information on the overcurrent tripping operation characteristic and information on the advance warning operation characteristic in addition to the information on the time-limited characteristic of the load current.

The advance warning processing unit 18 determines whether or not to cause the notification unit 32 to output an advance warning based on the load current effective value Irms. The advance warning processing unit 18 is information having an advance warning action characteristic. Specifically, the advance warning processing unit 18 determines whether or not the load current effective value Irms exceeds the advance warning threshold value defined by the advance warning operating characteristic. The advance warning processing unit 18 causes the notification unit 32 to output an advance warning when the effective load current value Irms exceeds the advance warning current threshold value Ip.

The recommended value calculation unit 19 calculates the recommended value of the pre-alarm operating characteristic based on the information on the load current time limit characteristic and the information on the overcurrent tripping operating characteristic. For example, the recommended value calculation unit 19 calculates the recommended value of the advance warning operation characteristic as a characteristic in the middle between the load current time limit characteristic and the overcurrent tripping operation characteristic. The advice value calculation unit 19 stores the calculated advice value of the advance warning operation characteristic in the memory unit 23 . In addition, the electronic circuit breaker 1 may have a configuration that does not include the recommended value calculation unit 19 .

The output unit 20 outputs the trip signal S to the trip circuit 30 according to requests from the instantaneous trip processing unit 14 , the short-time trip processing unit 15 , and the long-time trip processing unit 16 . The communication unit 21 communicates with the information processing device 50 by performing short-range wireless communication such as Bluetooth, for example. For example, when the communication unit 21 receives an information transmission request, which is a transmission request for characteristic information, from the information processing device 50, it stores in the memory unit 23 the characteristics of the overcurrent tripping operation, the pre-alarm operation characteristic, and the load current time limit characteristic. The characteristic information is sent to the information processing device 50 .

The setting unit 22 can set the information of the overcurrent tripping operation characteristic and the information of the advance warning operation characteristic according to the operation of the input unit 31 by the user or the information output from the communication unit 21 . For example, the setting unit 22 sets new overcurrent tripping operation characteristics for the short-time trip processing unit 15 and the long-time trip processing unit 16 according to the user's operation on the input unit 31 or the information output from the communication unit 21 . information, and the information of the new overcurrent tripping operation characteristic is stored in the memory unit 23 . In addition, the setting unit 22 sets the information of the new advance alarm operation characteristic to the advance alarm processing unit 18 according to the operation of the user on the input unit 31 or the information output from the communication unit 21, and makes the information of the new advance alarm operation characteristic memorized in the memory unit 23 .

When the information processing device 50 receives characteristic information from the electronic circuit breaker 1, it displays the received characteristic information. FIG. 3 shows an example of the configuration of the information processing apparatus according to the first embodiment map. FIG. 4 is a diagram showing an example of characteristic information displayed in the information processing apparatus of Embodiment 1. FIG. FIG. 5 is a diagram showing another example of characteristic information displayed in the information processing apparatus of the first embodiment.

As shown in FIG. 3 , the information processing device 50 includes a communication unit 51 , a display unit 52 , an input unit 53 , a control unit 54 , and a memory unit 55 . The communication unit 51 communicates with the electronic circuit breaker 1 by performing short-range wireless communication such as Bluetooth, for example. The display part 52 is, for example, an LCD (Liquid Crystal Display; liquid crystal display) or an organic EL (ElectroLuminescence; electroluminescence) display. The input unit 53 includes, for example, a keyboard, a mouse, an auxiliary keyboard, or a touch panel.

The control unit 54 causes the communication unit 51 to transmit an information transmission request, which is a transmission request of characteristic information, to the electronic circuit breaker 1 according to the operation of the input unit 53 by the user. The control unit 54 acquires the characteristic information transmitted from the electronic circuit breaker 1 in response to the information transmission request received by the communication unit 51 from the communication unit 51 , and stores the acquired characteristic information in the memory unit 55 . The control unit 54 acquires characteristic information from the memory unit 55 according to the operation of the input unit 53 by the user, and displays the acquired characteristic information on the display unit 52 as shown in FIG. 4 .

In addition, the control unit 54 includes a display processing unit 60 , a setting processing unit 61 , and a recommendation value calculation unit 62 . The display processing unit 60 acquires the characteristic information and the information for generating the updated image from the memory unit 55 , and can display the updated image on the display unit 52 based on the acquired information.

As shown in FIG. 5, the update image 70 displayed on the display unit 52 of the information processing device 50 includes a characteristic display area 71, a current setting value display area 72 for displaying the current setting value, and a block display area for inputting a new setting value 73. The update image 70 includes a setting value change bar 74 , an acquisition button 75 , a suggested value calculation button 76 , a suggested value setting button 77 , an update button 78 , and a write button 79 .

The characteristic display area 71 is arranged with graphs showing the overcurrent tripping action characteristic, the advance warning action characteristic, and the load current time limit characteristic. The current set value display area 72 displays each characteristic The current set values of are "Iu", "TL", "Is", "Ts", "Ii", and "Ip". "Iu" is a continuous current value, and is set within a range of, for example, 0.8 to 1.0 times the rated current In.

"TL" is the long-time trip action time that specifies the action time in the long-time trip zone. "Is" shown in FIG. 5 is an overcurrent judgment threshold value in the short-time tripping area, that is, a short-time operating current threshold value, and is set in the range of 1.5 to 10 times the rated current In, for example. "Ts" is the short-time trip action time that specifies the action time in the short-time trip zone. "Ii" is the overcurrent judgment threshold value in the instantaneous trip zone. "Ip" is the pre-alarm current threshold value.

The box display area 73 includes a text box in which new setting values of each characteristic can be input, and the user of the information processing device 50 can input new setting values in each text box by operating the input unit 53 .

The setting value change bar 74 is a graphical user interface (GUI) for changing the setting of the characteristic selected by the operation of the input unit 53 among the plurality of characteristics. The user of the information processing apparatus 50 can change the setting value by operating the setting value changing bar 74 by operating the input unit 53 .

The acquire button 75 is a GUI button for acquiring information on the load current time limit characteristic from the electronic circuit breaker 1 . The user operates the acquire button 75 to transmit the load characteristic transmission request requesting the information of the load current time limit characteristic to the electronic circuit breaker 1, thereby acquiring the load current time limit characteristic transmitted from the electronic circuit breaker 1 in response to the load characteristic transmission request information.

The suggested value calculation button 76 is a GUI button for calculating the suggested value of the action characteristic of the advance warning. When the user operates the recommended value calculation button 76, the recommended value calculation unit 62 of the control unit 54 calculates the recommended value of the pre-alarm operating characteristic based on the information on the load current time limit characteristic and the information on the overcurrent tripping operating characteristic. For example, the recommended value calculation unit 62 is designed to be a load current time limit characteristic and an overcurrent The recommended value of the pre-alarm operation characteristic is calculated by flowing the intermediate characteristic between the jumping operation characteristics. Then, the display processing unit 60 arranges the suggested advance alarm operation characteristic in the characteristic display area 71 based on the suggested value of the advance alarm operation characteristic calculated by the suggested value calculation unit 62 . In addition, the display processing unit 60 can also input the advice value of the advance warning operation characteristic calculated by the advice value calculation unit 62 into the text box of the box display area 73 .

In addition, the information processing device 50 may not be provided with the suggested value calculation unit 62 . At this time, the control unit 54 of the information processing device 50 can transmit a request for calculation of the recommended value to the electronic circuit breaker 1, so that the recommended value calculation unit 19 of the electronic circuit breaker 1 can calculate the recommended value of the advance warning operating characteristic. The advice value calculation unit 19 transmits the information of the advice value of the advance warning operation characteristic to the information processing device 50 via the communication unit 21 . The control unit 54 of the information processing device 50 acquires information on the recommended value of the advance warning operation characteristic via the communication unit 51 . The display processing unit 60 arranges the suggested advance alarm operation characteristic in the characteristic display area 71 based on the suggested value of the advance alarm operation characteristic calculated by the electronic circuit breaker 1 . In addition, the display processing unit 60 can also input the suggested value of the advance warning operation characteristic calculated by the electronic circuit breaker 1 into the text block of the block display area 73 .

The recommended value setting button 77 is a GUI button for setting the recommended value of the advance warning operation characteristic to the electronic circuit breaker 1 as a new set value of the advance warning operation characteristic. When the user operates the advice value setting button 77, the advice value calculation unit 62 of the control unit 54 calculates the advice value of the advance warning operation characteristic. Next, the setting processing unit 61 of the control unit 54 causes the communication unit 51 to transmit to the electronic circuit breaker 1 the setting request information of the new setting value of the advance alarm operation characteristic including the suggested value of the advance alarm operation characteristic. The setting unit 22 of the electronic circuit breaker 1 acquires the setting request information via the communication unit 21, and sets the new setting value of the pre-alarm operating characteristic, which is the recommended value of the pre-alarm operating characteristic included in the acquired setting request information, to the pre-alarm processing unit 18 .

The update button 78 is a GUI button for inputting a value corresponding to the position of the setting value change bar 74 to the text box of the box display area 73 . When the user operates the update button 78 , the display processing unit 60 of the control unit 54 inputs a value corresponding to the position of the setting value change bar 74 into the text block of the block display area 73 .

The write button 79 is a GUI button for setting the new setting value of the text block input in the block display area 73 to the electronic circuit breaker 1 . When the user operates the write button 79 , the setting processing unit 61 of the control unit 54 causes the communication unit 51 to transmit setting request information including the new setting value of the text block input to the block display area 73 to the electronic circuit breaker 1 . The setting unit 22 of the electronic circuit breaker 1 obtains setting request information via the communication unit 21, and sets the information contained in the acquired setting request information to the short-time trip processing unit 15, the long-time trip processing unit 16, and the The advance warning processing unit 18 .

Next, the process performed by the processing part 10 of the electronic circuit breaker 1 is demonstrated using a flowchart. 6 is a flowchart showing an example of the processing performed by the processing unit of the electronic circuit breaker according to the first embodiment, which is repeatedly executed every time the processing program time ΔTroop elapses.

As shown in FIG. 6, the processing part 10 sets the energization time data Tx to 0, and performs initialization (step S10). The power-on time data Tx includes the power-on time TxP[i] data and the power-on time TxS[i] data according to each current level Ilevel[i]. "i" is any integer from "1" to "n", and the power-on time data Tx includes the power-on time TxP[1] to TxP[n] of the current levels Ilevel[1] to [n] and the power-on time TxS [1] to TxS[n] data.

n is the maximum value of the current level Ilevel. The maximum value of the current level Ilevel is a value obtained by dividing the maximum value of the horizontal axis of the graph shown in FIG. 2 by the unit current value Imin. The unit current value Imin is the smallest unit of the value of the horizontal axis of the graph shown in FIG. 2 .

Next, the processing unit 10 calculates the load based on the digital value output by the AD conversion unit 11 Current effective value Irms (step S11). The processing unit 10 determines whether or not the load current effective value Irms calculated in step S11 exceeds the advance warning current threshold value Ip (step S12 ).

When the processing unit 10 determines that the load current effective value Irms exceeds the pre-alarm current threshold value Ip (step S12: YES), it determines whether the load current effective value Irms calculated in step S11 exceeds the short-time operating current threshold value Is (step S12: YES). S13). When the processing unit 10 determines that the effective value of the load current Irms exceeds the short-time operating current threshold value Is (step S13: YES), the processing program time ΔTroop is multiplied by the short-time operating current threshold value for the current accumulated current value S1. The current product obtained by the square value Is ² of the value Is is added to the previous accumulated current value S2, and then, for the next processing procedure, the previous accumulated current value S2 is set to the same value as the current accumulated current value S1 (step S14).

Here, the current accumulated current value S1 will be described. FIG. 7 is a diagram showing an example of the overcurrent tripping action characteristic of the electronic circuit breaker of Embodiment 1. FIG. When the load current of the load current effective value Irms1 shown in FIG. 7 continues to flow during the time Te2, the current accumulated current value S1 is surrounded by the line segment from 0 to Te2 on the vertical axis and the line segment from 0 to Irms1 ² on the horizontal axis The area of the rectangle can be represented by S1=Te2×Irms1 ² .

In step S13 shown in FIG. 6 , when the processing unit 10 determines that the effective value of the load current Irms does not exceed the short-time operating current threshold value Is (step S13 : NO), the processing unit 10 sets the overcurrent excess flag Flg to "1" (step S15). Next, the processing unit 10 adds the current product obtained by multiplying the processing program time ΔTroop by the square value Irms ² of the effective value of the load current Irms to the previous accumulated current value S2 for the current accumulated current value S1 . In the processing procedure, the previous accumulated current value S2 is set to the same value as the current accumulated current value S1 (step S16).

When the processing unit 10 determines that the effective load current value Irms does not exceed the advance warning current threshold value Ip (step S12 : NO), it determines whether the overcurrent excess flag Flg is “1” (step S18 ). where When the processing unit 10 determines that the overcurrent excess flag Flg is "1" (step S18: YES), the process proceeds to the residual current product correction process in step S19.

Specifically, the processing unit 10 subtracts the current product obtained by multiplying the processing program time ΔTroop and the heat dissipation coefficient P from the previous accumulated current value S2 for the current accumulated current value S1, and then, for the next processing program, the previous The second accumulated current value S2 is set to the same value as the current accumulated current value S1 (step S19). By subtracting the current product obtained by multiplying the processing program time ΔTroop and the heat dissipation coefficient P from the previous accumulated current value S2, when the effective value of the load current Irms becomes equal to or less than the pre-alarm current threshold value Ip, the current accumulated current value S1 can be obtained from the current product. Subtract the equivalent of cooling. The heat dissipation coefficient P is the heat dissipation coefficient per unit time. The unit time is, for example, 1 second.

Next, the processing unit 10 determines whether or not the current accumulated current value S1 is a value smaller than "0" (step S20). When the processing unit 10 determines that the current accumulated current value S1 is a value smaller than "0" (step S20: "Yes"), the processing unit 10 sets the current accumulated current value S1 and the previous accumulated current value S2 to "0" (step S21) , and the overcurrent exceeding flag Flg is set to "0" (step S22).

The processing unit 10 determines whether or not the current accumulated current value S1 is equal to or larger than the constant K when the processing of step S14 or the processing of step S16 is completed (step S17 ). The constant K is the overcurrent judgment threshold specified by the long-time tripping characteristic preset in the overcurrent tripping action area. The long-time trip characteristic is set according to the value of "TL" shown in FIG. 5 . "TL" means, for example, the long-term tripping operation time when a load current twice the rated current In flows.

In the long-time tripping characteristics in FIG. 7 , the long-time tripping action time Te1 is expressed as Te1=K/Irms1 ² . The constant K is a value corresponding to the area S0 shown in FIG. 7 . The area S0 is the area of the rectangle surrounded by the line segment from 0 to Te1 on the vertical axis and the line segment from 0 to Irms1 ² on the horizontal axis. That is, the constant K is a value represented by K=S0=Te1×Irms1 ² .

The processing unit 10 determines that the current accumulation current value S1 is not equal to or greater than the constant K (step S17 : NO), or when the overcurrent excess flag Flg is not determined to be “1” (step S18 : NO) When the current value S1 is not a value smaller than "0" (step S20: NO), or when the processing of step S22 ends, the short-time counter processing is performed (step S23). The short-time counter processing is the processing of steps S30 to S33 shown in FIG. 8 , and the details will be described later.

Next, the processing unit 10 determines whether the current short-time counter STD1 is equal to or greater than the constant L (step S24). The constant L is the value specified by the preset short-time tripping characteristic in the overcurrent tripping action area. For example, the constant L is an overcurrent determination threshold value obtained by multiplying the short-time operating current threshold value Is by the short-time operating time Ts.

When the processing unit 10 determines that the short-time-out processing unit 15 is tripped and the short-time counter STD1 is not equal to or greater than the constant L this time (step S24: NO), the processing unit 10 performs the load current characteristic calculation processing (step S25), and causes the processing to jump. Go to step S11. This load current characteristic calculation process is the process of steps S40 to S44 shown in FIG. 9 , and the details will be described later.

When the processing unit 10 determines that the current short-time counter STD1 is equal to or larger than the constant L (step S24: YES) or determines that the current accumulated current value S1 is equal to or larger than the constant K (step S17: YES), the processing unit 10 sends a trip signal. S is output to the trip circuit 30, the switch contact 4 is changed from the closed state to the open state by the trip device 5 (step S26), and the process shown in FIG. 6 is ended.

The processing of step S11 is executed by the effective value calculation unit 13 of the processing unit 10 , and the processing of steps S12 to S22 is executed by the long-time skip processing unit 16 of the processing unit 10 . In addition, the processing of steps S23 and S24 is performed by the peak value calculation unit 12 and the short-time trip processing unit 15 of the processing unit 10 , and the processing of step S25 is performed by the load current characteristic calculation unit 17 . In addition, the process of step S26 is performed by the output part 20 of the processing part 10.

FIG. 8 is a flowchart showing an example of short-time counter processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1. FIG. As shown in FIG. 8 , the peak value calculation unit 12 of the processing unit 10 calculates the load current peak value Ipeak based on the digital value output from the AD conversion unit 11 (step S30 ).

Next, the short-time trip processing unit 15 of the processing unit 10 determines whether or not the load current peak value Ipeak calculated in step S30 exceeds the short-time operating current threshold value Is (step S31 ). When the short-time trip processing unit 15 determines that the load current peak value Ipeak exceeds the short-time operating current threshold value Is (step S31: "Yes"), the value obtained by adding "1" to the value of the previous short-time counter STD2 is used as this value. The value of the next short time counter STD1 is then set to the same value as the current short time counter STD1 for the next processing routine (step S32).

In addition, when the short-time trip processing unit 15 determines that the load current peak value Ipeak does not exceed the short-time operating current threshold value Is (step S31: NO), the value obtained by subtracting “1” from the previous short-time counter STD2 The value is set as the value of the current short-time counter STD1, and the value of the previous short-time counter STD2 is set to the same value as the current short-time counter STD1 for the next processing routine (step S33). The processing unit 10 ends the process shown in FIG. 8 when the process of step S32 ends or the process of step S33 ends.

9 is a flowchart showing an example of the load current characteristic calculation process performed by the processing unit of the electronic circuit breaker according to the first embodiment. As shown in FIG. 9 , the load current characteristic calculation unit 17 of the processing unit 10 performs TxS update processing in order to obtain the energization time TxS[i] (step S40 ).

In step S40, the load current characteristic calculation unit 17 calculates the current level I1level by dividing the current accumulated current value S1 by the unit current value Imin. The load current characteristic calculation unit 17 acquires the information of the current accumulated current value S1 from the long-time trip processing unit 16 . In addition, the load current characteristic calculation unit 17 may calculate the current accumulated current by the same calculation as that of the long-time trip processing unit 16 . The composition of the stream value S1.

Next, the load current characteristic calculation unit 17 calculates the energization times TxS[1] to TxS[I1level]. When the current level Ilevel below the current level I1level is set to "x", the load current characteristic calculation unit 17 calculates the energization time TxS[x] by calculation of the following formula (1). "x" is an integer from "1" to "I1level", which represents the current level Ilevel.

TxS[x]=△Troop×S1/(x×Imin) ² …(1)

Specifically, the load current characteristic calculation unit 17 multiplies the unit current value Imin by each of a plurality of current levels Ilevel[1] to Ilevel[I1level] from the current current level I1level to the current accumulated current value S1 The value of the squared value is divided and then the value of the maximum current counters Icntm[1] to Icntm[I1level] is obtained. Then, the load current characteristic calculation unit 17 calculates the energization time TxS[1] to TxS[I1level] by multiplying the value of each of the maximum current counters Icntm[1] to Icntm[I1level] by the processing program time ΔTroop .

Since the accumulated current value S1 this time is calculated based on the effective value of the load current Irms, the energization time TxS integrated with the long-term tripping area of the overcurrent tripping action characteristic can be obtained through step S40, but the pre-alarm current is When the load current below the limit value Ip continues to flow, the process of step S19 shown in FIG. 6 is performed. Therefore, when the load current below the advance warning current threshold value Ip continues to flow, the current accumulated current value S1 becomes "0", and the energization time TxS[x] cannot be calculated. In addition, in the short-time tripping area and the instantaneous tripping area, since the overcurrent tripping action is performed according to the load current peak value Ipeak, it is not possible to obtain an integration with the short-time tripping area and the instantaneous tripping area in the tripping action characteristics. Power-on time.

In contrast, the load current characteristic calculation unit 17 performs TxP update processing for obtaining the energization time TxP[x] using the load current peak value Ipeak (step S41 ). The TxP update process is shown in Figure 10 The processing of steps S50 to S56 shown will be described in detail later.

Next, the load current characteristic calculation unit 17 determines whether the value of the energization time TxS[x] is greater than the value of the energization time TxP[x] for each current level Ilevel[x] (step S42 ). For example, the load current characteristic calculation unit 17 determines whether the value of the energization time TxS[1] is larger than the value of the energization time TxP[1], and determines whether the value of the energization time TxS[I1level] is larger than the value of the energization time TxP[I1level].

When the load current characteristic calculation unit 17 determines that the value of the energization time TxS[x] is greater than the value of the energization time TxP[x] (step S42: YES), the value of the energization time TxS[x] is set to the maximum energization time Txmax[ x] (step S43). For example, when the value of the energization time TxS[1] is larger than the value of the energization time TxP[1], the load current characteristic calculation unit 17 sets the value of the energization time TxS[1] to the value of the maximum energization time Txmax[1]. The load current characteristic calculation unit 17 sets the value of the energization time TxS[I1level] to the value of the maximum energization time Txmax[I1level] when the value of the energization time TxS[I1level] is greater than the value of the energization time TxP[I1level].

In addition, when the load current characteristic calculation unit 17 determines that the value of the energization time TxS[x] is not greater than the value of the energization time TxP[x] (step S42: NO), the value of the energization time TxP[x] is set to the maximum energization time Time Txmax[x] (step S44). For example, the load current characteristic calculation unit 17 sets the value of the energization time TxP[1] to the maximum energization time Txmax[1] when the value of the energization time TxS[1] is not greater than the value of the energization time TxP[1]. Further, the load current characteristic calculation unit 17 sets the value of the energization time TxP[I1level] to the maximum energization time Txmax[I1level] when the value of the energization time TxS[I1level] is not larger than the value of the energization time TxP[I1level].

In this way, the load current characteristic calculation unit 17 uses the larger of the value of the energization time TxS[x] and the value of the energization time TxP[x]. Thereby, for example, when the load current periodically fluctuates and falls below the pre-alarm current threshold value Ip or the like, the energization time TxP[x] can be used. because Therefore, for example, the load current time limit characteristic can be calculated more appropriately from the viewpoint of reference when setting the advance warning operation characteristic.

The load current characteristic calculation unit 17 stores the maximum energization time Txmax[x] in the storage unit 55 when the processing of step S43 is completed or when the processing of step S44 is completed, and updates the information of the load current time limit characteristic (step S45 ). The load current characteristic calculation unit 17 ends the process shown in FIG. 9 when the process of step S45 ends.

The load current characteristic calculation unit 17 can store the information of the load current time limit characteristic including the information of the maximum energization time Txmax[n] of each current level Ilevel in the storage unit 55 by repeating the above-mentioned processing.

In addition, the load current characteristic calculation unit 17 uses the energization time TxP[k] in the short-time trip area, and can use only the energization time in the long-time trip area and in the area longer than the long-time trip area TxS[p]. Here, "k" is the current level Ilevel corresponding to the short time, and "p" is the current level corresponding to the trip area of the long time and the area whose time is longer than the trip area of the long time.

FIG. 10 is a flowchart showing an example of TxP update processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1. FIG. As shown in FIG. 10 , the load current characteristic calculation unit 17 calculates the current current level I1level by dividing the load current peak value Ipeak calculated in step S30 shown in FIG. 8 by the unit current value Imin (step S50 ).

For example, when the range of the horizontal axis of the load current characteristic is 0% to 2000% of the rated current In and the unit current value Imin is 5% In, the current level I1level is in the range of 1 to 400. When the load current peak value Ipeak is 1000%In, the current level I1level becomes 1000%In/5%In=200. Here, "5%In" means 5% of the rated current In, and "1000%In" means 1000% of the rated current In.

Next, the load current characteristic calculation unit 17 adds "1" to the value of the current current counter Icnt[x] of the current current level I1level or lower among the current current counters Icnt[1] to Icnt[n] (step S51). "x" shown in step S51 of Fig. 10 is an integer from "1" to "I1level". Therefore, in the process of step S51, the value of each of the current current counters Icnt[1] to Icnt[I1level] below the current current level I1level among the current current counters Icnt[1] to Icnt[n] Add "1".

Next, the load current characteristic calculation unit 17 determines whether the previous current level I0level is greater than the current current level I1level (step S52 ). When the processing unit 10 determines that the previous current level I0level is greater than the current current level I1level (step S52: YES), the processing unit 10 sets the value of the current current counter Ient whose current level Ilevel is greater than the current current level I1level to “0” (step S52: YES). S53).

Specifically, the load current characteristic calculation unit 17 sets the current current counter Ient[I1level+1 corresponding to the current level Ilevel greater than the current current level I1level among the current levels Ilevel in the range up to the previous current level I0level ] to Icnt[I0level] is set to "0" and cleared.

Next, the load current characteristic calculation unit 17 determines the current level of the current counter Icnt[x] when the processing of step S53 is completed or when it is determined that the previous current level I0level is not greater than the current current level I1level (step S52: NO) Is the value greater than the value of the maximum current counter Icntm[x] (step S54).

"x" shown in step S54 of Fig. 10 is an integer from "1" to "I1level". Therefore, in the process of step S54, it is determined whether the current value of each of the current counters Icnt[1] to Icnt[I1level] is greater than the corresponding maximum current value among the plurality of maximum current counters Icntm[1] to Icntm[I1level] The value of the current counter Icntm.

When the load current characteristic calculation unit 17 determines that the value of the current counter Icnt[x] is greater than the value of the maximum current counter Icntm[x] (step S54: YES), the value of the maximum current counter Icntm[x] is set to the same value as the value of the maximum current counter Icntm[x]. The current counter Icnt[x] has the same value this time (step S55).

For example, when the value of the current counter Icnt[1] is larger than the value of the maximum current counter Icntm[1], the load current characteristic calculation unit 17 sets the value of the maximum current counter Icntm[1] to the same value as the current counter Icnt [1] Same value. In addition, the load current characteristic calculation unit 17 does not update the value of the maximum current counter Icntm[1] when the current value of the current counter Icnt[1] is not larger than the value of the maximum current counter Icntm[1].

In addition, the load current characteristic calculation unit 17 sets the value of the maximum current counter Icntm[1] to the same value as the current counter Icnt when the value of the current counter Icnt[I1level] is larger than the value of the maximum current counter Icntm[I1level] [I1level] Same value. In addition, the load current characteristic calculation unit 17 does not update the value of the maximum current counter Icntm[I1level] when the current value of the current counter Icnt[I1level] is not greater than the value of the maximum current counter Icntm[1].

Next, the load current characteristic calculation unit 17 calculates the value of the current counter Icnt[x] that is not greater than the value of the maximum current counter Icntm[x] when the process of step S55 is completed or when the value of the current counter Icntm[x] is determined (step S54: NO) The value obtained by multiplying the value of the maximum current counter Icntm[x] by the processing program time ΔTroop is used as the energization time TxP[x] (step S56 ).

"x" shown in step S56 of Fig. 10 is an integer from "1" to "I1level". Therefore, in the process of step S56, the load current characteristic calculation unit 17 calculates the energization time TxP[1] to TxP[Ilevel]. When the load current characteristic calculation unit 17 ends the process of step S56, the process shown in FIG. 10 ends.

Here, the TxP update process and the TxS update process will be described in more detail. FIG. 11 is a diagram showing an example of the load current when the load of Embodiment 1 is a generator. When the load 3 is a generator, a starting current as shown in FIG. 11 flows. In Fig. 11, the vertical axis represents the instantaneous value of the load current, The horizontal axis represents time. In addition, each cycle in the horizontal axis represents the cycle of the processing program time ΔTroop.

In the example shown in FIG. 11 , the peak value of the load current is the largest in the first cycle, and after that, the generator is accelerated to the rated speed and the peak value gradually decreases. Specifically, the load current shown in FIG. 11 has the largest peak value in the first cycle, which is 500% In. In addition, the extreme value of the load current decreases with time, the peak value in the fifth cycle becomes 50% In, and the peak value after the sixth cycle is maintained at 50% In. "500%In" represents the value of 500% of the rated current In, and "50%In" represents the value of 50% of the rated current In.

Hereinafter, the unit current value Imin is assumed to be 50% In. In the initial state, the initial value of each current current counter Icnt[i] is “0”, the initial value of each maximum current counter Icntm[i] is “0”, and the initial value of each previous current level I0level[i] The value is "n".

FIG. 12 is a diagram for explaining the TxP update process in the first cycle shown in FIG. 11 . FIG. 13 is a diagram for explaining the TxP update process in the second cycle shown in FIG. 11 . FIG. 14 is a diagram for explaining the TxP update process in the third cycle shown in FIG. 11 . FIG. 15 is a diagram for explaining the TxP update process in the fourth cycle shown in FIG. 11 . FIG. 16 is a diagram for explaining the TxP update process in the fifth cycle shown in FIG. 11 . FIG. 17 is a diagram for explaining the TxP update process in the sixth cycle shown in FIG. 11 . FIG. 18 is a diagram for explaining the TxP update process in the seventh cycle shown in FIG. 11 . FIG. 19 is a diagram for explaining the TxP update process of the 99th cycle shown in FIG. 11 .

In the first cycle, since the load current peak value Ipeak is 500%In, the processing unit 10 calculates by the calculation of I1level=Ipeak/Imin=500%In/50%In in the process of step S50 shown in FIG. 10 . The current level I1level this time is "10".

The current current counters Icnt of the current level Ilevel below the current current level I1level are the current current counters Icnt[1] to Icnt[10]. Therefore, the processing unit 10 adds "1" to the values of the current counters Icnt[1] to Icnt[10] in step S51 shown in FIG. 10 .

In the first cycle, the previous current level I0level is "0". The processing unit 10 determines in step S52 shown in FIG. 10 that it is not I0level>I1level, and jumps the process to step S54. In step S54 shown in FIG. 10 , the processing unit 10 determines whether or not the values of the current current counters Icnt[1] to Icnt[10] are larger than the corresponding ones of the maximum current counters Icntm[1] to Icntm[10] The value of the maximum current counter Icntm.

In the first cycle, the values of the maximum current counters Icntm[1] to Icntm[10] are "1". Therefore, in step S55 shown in FIG. 10 , the processing unit 10 sets “1” of the values of the respective maximum current counters Icntm[1] to Icntm[10] to be the same as the current current counters Icnt[1] to Icnt[ 10] The value of the current counter Icnt corresponding to this time.

Next, in step S56 shown in FIG. 10 , the processing unit 10 multiplies the processing program time ΔTroop by the values of the maximum current counters Icntm[1] to Icntm[10] to calculate the energization times TxP[1] to TxP[10 ]. The processing program time △Troop is 20ms, so each power-on time TxP[1] to TxP[10] is 20ms.

Next, the processing of the processing unit 10 in the second cycle will be described. In the second cycle, since the load current peak value Ipeak is 400%In, the processing unit 10 is in the process of step S50 shown in FIG. 10 . Regarding the current level I1level, Ipeak/Imin=400%In/50% The calculation of the current level I1level is calculated to be "8".

The current current counters Icnt of the current level Ilevel below the current current level I1level are the current current counters Icnt[1] to Icnt[8]. Therefore, the processing unit 10 adds "1" to the values of the current counters Icnt[1] to Icnt[8] in step S51 shown in FIG. 10 . Since the previous current level I0level was "10", the processing unit 10 sets the current value of the current counters Icnt[9] and Icnt[10] to "0" in the process of step S53 shown in FIG. 10 .

The processing unit 10 determines each current current counter in step S54 shown in FIG. 10 . Whether the values of Icnt[1] to Icnt[8] are greater than the value of the corresponding maximum current counter Icntm among the maximum current counters Icntm[1] to Icntm[8]. The values of the current counters Icnt[1] to Icnt[8] this time are “2”, which is larger than the values of the maximum current counters Icntm[1] to Icntm[8]. Therefore, in step S55 shown in FIG. 10 , the processing unit 10 sets “2” of the values of the respective maximum current counters Icntm[1] to Icntm[8] to be the same as the current current counters Icnt[1] to Icnt[ 8] The corresponding value of this current counter Icnt.

As shown in FIGS. 15 to 19 , the processing unit 10 performs the same processing as the first cycle and the second cycle for each of the third cycle to the 99th cycle, and calculates the energization times TxP[1] to TxP[10] . Thereby, the processing unit 10 can calculate the energization time TxP integrated with the load current peak value Ipeak.

Next, the TxS update process will be described. FIG. 20 is a diagram for explaining the TxS update processing in the first cycle and the second cycle shown in FIG. 11 . FIG. 21 is a diagram for explaining the TxS update processing in the third cycle and the fourth cycle shown in FIG. 11 . FIG. 22 is a diagram for explaining the TxS update processing in the fifth cycle and the sixth cycle shown in FIG. 11 . FIG. 23 is a diagram for explaining the TxS update processing in the seventh cycle and the 99th cycle shown in FIG. 11 .

In the TxS update process shown in FIG. 9 , the processing unit 10 squares the value obtained by multiplying each of a plurality of current levels Ilevel up to the current current level I1level by the unit current value Imin for the current accumulated current value S1 . The latter value is divided to obtain the value of each maximum current counter Icntm[x]. In addition, in the following, the unit current value Imin is set to 50% In.

In the example shown in FIG. 20 , in the first cycle, the effective value of the load current Irms is 500% In, and the previous accumulated current value S2 is 0. Therefore, the current level 11level is 500%In/50%In=10, and the current accumulated current value S1 is Irms ² ×ΔTroop=500 ² ×0.02=5000.

The current value of the current counter Icnt[1] is 5000÷(1×50) ² =2. Therefore, the value of the maximum current counter Icntm[1] calculated by the processing unit 10 is “2” as shown in FIG. 20 . . In addition, the value of the current counter Icnt[2] this time is 5000÷(2×50) ² =0.5. Therefore, according to rounding, the value of the maximum current counter Icntm[2] calculated by the processing unit 10 is as shown in FIG. 20 . shown as "1".

In addition, the value of the current counter Icnt[3] this time is 5000÷(3×50) ² =0.2. Therefore, according to rounding, the value of the maximum current counter Icntm[3] calculated by the processing unit 10 is as shown in FIG. 20 . displayed as "0". Similarly, the values of the maximum current counters Icntm[4] to Icntm[10] calculated by the processing unit 10 are also "0" as shown in FIG. 20 .

The processing unit 10 calculates the energization time TxS[1] to TxS[10 by multiplying the value of each maximum current counter Icntm[1] to [10] by the processing program time ΔTroop in the TxS update process shown in FIG. 9 . ]. The power-on time TxS[1] is Icntm[1]×△Troop=2×20=40[ms]. The power-on time TxS[2] is Icntm[2]×△Troop=1×20=20[ms]. In addition, the power-on time TxS[3] to TxS[10] are 0 [ms].

In the example shown in Fig. 20, in the second cycle, the effective value of the load current Irms is 400% In. Therefore, the current level I1level is 400%In/50%In=8, and the current accumulated current value S1 is S2+Irms ² ×△Troop=5000+400 ² ×0.02=8200.

The value of the current counter Icnt[1] this time is 8200÷(1×50) ² =3.28. Therefore, the value of the maximum current counter Icntm[1] calculated by the processing unit 10 is “3” as shown in FIG. 20 . . In addition, the value of the current counter Icnt[2] this time is 8200÷(2×50) ² =0.82. Therefore, according to rounding, the value of the maximum current counter Icntm[2] calculated by the processing unit 10 is as shown in FIG. 20 . shown as "1".

In addition, the value of the current counter Icnt[3] this time is 8200÷(3×50) ² =0.36. Therefore, according to rounding, the value of the maximum current counter Icntm[3] calculated by the processing unit 10 is as shown in FIG. 20 . displayed as "0". Similarly, the values of the maximum current counters Icntm[4] to Icntm[10] calculated by the processing unit 10 are also "0" as shown in FIG. 20 .

The processing unit 10 processes by multiplying the values of the respective maximum current counters Icntm[1] to [10] The energization time TxS[1] to TxS[10] is calculated according to the program time ΔTroop. The power-on time TxS[1] is Icntm[1]×△Troop=3×20=60[ms]. The power-on time TxS[2] is Icntm[2]×△Troop=2×20=20[ms]. In addition, the power-on time TxS[3] to TxS[10] is 0 ms.

As shown in FIGS. 21 to 23 , the processing unit 10 performs the same processing as the first cycle and the second cycle for each of the third cycle to the 99th cycle, and calculates the energization time TxS[1] to TxS[10] . Thereby, the processing unit 10 can calculate the energization time TxS integrated with the load current effective value Irms.

FIG. 24 is a diagram showing an example of the hardware configuration of the processing unit of the electronic circuit breaker according to the first embodiment. As shown in FIG. 24 , the processing unit 10 of the electronic circuit breaker 1 includes a computer including a processor 101 , a memory 102 , an AD converter 103 , an input/output interface 104 , and a communication device 105 .

The processor 101 , the memory 102 , the AD converter 103 , the input/output interface 104 , and the communication device 105 can exchange data with each other through, for example, the bus bar 106 . The AD conversion unit 11 is realized by the AD converter 103 . The communication unit 21 is realized by the communication device 105 . The output unit 20 is realized by the input/output interface 104 . The processor 101 reads out and executes the program stored in the memory 102, thereby executing the peak value calculation unit 12, the effective value calculation unit 13, the instantaneous trip processing unit 14, the short-time trip processing unit 15, and the long-time trip. Functions of the processing unit 16 , the load current characteristic calculation unit 17 , the advance warning processing unit 18 , the recommended value calculation unit 19 , and the setting unit 22 . The processor 101 is, for example, an example of a processing circuit, and includes one of a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a system LSI (Large Scale Integration) above.

The memory 102 includes RAM (Random Access Memory), ROM (Read Only Memory), flash memory (Flash memory), One or more of EPROM (Erasable Programmable Read Only Memory; Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory; Electronically Erasable Programmable Read Only Memory) . In addition, the memory 102 includes a recording medium on which a computer-readable program is recorded. The recording medium includes non-volatile or volatile semiconductor memory, magnetic disc, flexible memory, optical disc, compact disc, and DVD (Digital Versatile Disc; Digital Versatile Disc; Digital Versatile Disc). function disc) one or more of them. In addition, the electronic circuit breaker 1 may also include integrated circuits such as ASIC (Application Specific Integrated Circuit) and FPGA (Field Programmable Gate Array).

Moreover, the control part 54 of the information processing apparatus 50 is comprised by the processor 101, the memory 102, the AD converter 103, the input-output interface 104, and the bus bar 106 shown in FIG. The processor 101 reads out and executes the program stored in the memory 102 , thereby executing the functions of the display processing unit 60 , the setting processing unit 61 , and the recommended value calculation unit 62 .

As described above, the electronic circuit breaker 1 of the first embodiment includes the switching contact 4 , the trip device 5 , the current detection unit 7 , the peak value calculation unit 12 , the effective value calculation unit 13 , and the short-time trip processing unit 15 , a long-time trip processing unit 16 , a load current characteristic calculation unit 17 , and an output unit 20 . The switch contact 4 opens and closes the line 6 between the power source 2 and the load 3 . The tripping device 5 changes the switch contact 4 from the closed state to the open state. The current detection unit 7 detects the current flowing through the line 6 . The peak value calculation unit 12 calculates the load current peak value Ipeak which is the peak value of the current detected by the current detection unit 7 . The effective value calculation unit 13 calculates the load current effective value Irms which is the effective value of the current detected by the current detection unit 7 . The short-time trip processing unit 15 uses the trip device 5 to change the switch contact 4 from the closed state to the open state when it is determined from the load current peak value Ipeak that an overcurrent flows in the line 6 in the short-time area. long time escape The processing unit 16 uses the tripping device 5 to change the open/close contact 4 from the closed state to the open state when it is determined from the load current effective value Irms that there is an overcurrent flowing in the line 6 in the long-time area that is longer than the short-time period. . The load current characteristic calculating unit 17 calculates the current characteristic of the load 3 in the short-time region, that is, the short-time load current characteristic, based on the load current peak value Ipeak, and calculates the current characteristic of the load 3 in the long-time region, that is, from the load current effective value Irms. Long-term load current characteristics. The output unit 20 outputs information including the load current time-limit characteristic including the short-time load current characteristic and the long-time load current characteristic calculated by the load current characteristic calculation unit 17 . In this way, the electronic circuit breaker 1 can prompt the user to obtain the load current time limit characteristic integrated with the overcurrent tripping action characteristic, so the user can appropriately implement the overcurrent tripping action characteristic.

In addition, the load current characteristic calculation unit 17 calculates the long-term load current characteristic based on the load current effective value Irms and the load current peak value Ipeak. Thereby, the electronic circuit breaker 1 can accurately calculate the long-term load current characteristics.

Moreover, the electronic circuit breaker 1 is provided with the advance warning processing part 18 and the advice value calculation part 19. The pre-alarm processing unit 18 determines whether or not the pre-alarm is necessary based on the pre-alarm operating characteristic that defines the pre-alarm current threshold value Ip that is lower than the overcurrent specified by the overcurrent tripping operational characteristic. Determine the threshold value. The recommended value calculation unit 19 calculates the recommended value of the pre-alarm operating characteristic based on the information on the load current time limit characteristic and the information on the overcurrent tripping operating characteristic. Thereby, in the electronic circuit breaker 1, the user can appropriately perform the advance warning operation characteristic.

Further, the circuit breaker system 100 of the first embodiment includes the electronic circuit breaker 1 and the information processing device 50 that can be connected to the electronic circuit breaker 1 in a communicative manner. The electronic circuit breaker 1 includes a pre-alarm processing unit 18 that determines whether or not a pre-alarm is necessary based on a pre-alarm operating characteristic that defines a pre-alarm current threshold value Ip, the pre-alarm current threshold value Ip to be lower than The threshold value of the overcurrent judgment threshold value specified by the overcurrent tripping action characteristic. The information processing device 50 includes a communication unit 51 and a suggested value calculation unit 62 . The communication unit 51 receives information on the load current time limit characteristics and information on the overcurrent tripping operation characteristics from the electronic circuit breaker 1 . The recommended value calculation unit 62 calculates a recommended value of the pre-alarm current threshold value Ip based on the information on the load current time limit characteristics and the information on the overcurrent tripping operation characteristics received by the communication unit 51 . Thereby, in the circuit breaker system 100, the user can appropriately perform the advance warning operation characteristic.

In addition, the communication unit 51 transmits to the electronic circuit breaker 1 the advice value information including the information of the advice value of the pre-alarm current threshold value Ip calculated by the advice value calculation unit 62 . The electronic circuit breaker 1 includes a setting unit 22 that sets information on the advance warning operating characteristics in the advance warning processing unit 18 based on the recommended value information transmitted from the information processing device 50 . Thereby, in the circuit breaker system 100, the user can appropriately perform the advance warning operation characteristic.

In addition, the communication unit 51 transmits to the electronic circuit breaker 1 the advice value information including the information of the advice value of the pre-alarm current threshold value Ip calculated by the advice value calculation unit 62 . The electronic circuit breaker 1 includes an input unit 31 having a knob for setting information on the advance alarm operation characteristic in the advance alarm processing unit 18 . Thereby, in the circuit breaker system 100, the user can appropriately perform the advance warning operation characteristic.

The configurations disclosed in the above-described embodiments are merely examples of the contents of the present invention, and the present invention can be combined with other known techniques, and a part of the configurations can be omitted or modified without departing from the gist of the present invention.

1: Electronic circuit breaker

2: Power

3: load

3 ₁ : Electrical Machines

3 ₂ : Electrical equipment

4,4 ₁ ~4 ₃ : Open and close contacts

5: tripping device

6,6 ₁ ~6 ₃ : line

7: Current detection section

8 ₁ ~8 ₃ : Comparator

9: Voltage conversion section

10: Processing Department

11: AD conversion section

12: Peak calculation section

13: Effective value calculation section

14: Instantaneous trip processing section

15: Short-time trip processing department

16: Long time limit trip processing section

17: Load current characteristic calculation part

18: Advance Alert Handling Department

19: Suggested value calculation section

20: Output part

21: Department of Communications

22: Setting section

23: Memory Department

30: trip circuit

31: Input part

32: Reporting Department

50: Information processing device

100: Circuit Breaker System

S: trip signal

Claims (6)

An electronic circuit breaker is provided with: The opening and closing contacts are used to open and close the line between the power supply and the load; A tripping device, which makes the aforementioned opening and closing contacts change from a closed state to an open state; The current detection part detects the current flowing through the circuit; a peak value calculation unit for calculating the peak value of the current detected by the current detection unit; an effective value calculation unit for calculating the effective value of the current detected by the current detection unit; The short-time trip processing unit uses the trip device to change the open/close contact from the closed state when it is determined that there is an overcurrent flowing in the line in the short-time area based on the peak value calculated by the peak value calculation unit. open state; The long-time trip processing unit determines, based on the effective value calculated by the effective value calculation unit, that there is an overcurrent flowing in the line in an area belonging to a long-time period that is longer than the short-time period. The disconnecting device makes the aforementioned opening and closing contacts change from a closed state to an open state; The load current characteristic calculating unit calculates the current characteristic of the load in the short-time region, that is, the short-time load current characteristic based on the peak value calculated by the peak value calculating unit, and calculates the short-time load current characteristic according to the value calculated by the effective value calculating unit The aforesaid effective value of , calculates the current characteristic of the aforesaid load in the aforesaid long-time region, that is, the long-time load current characteristic; and The output unit outputs information on load current characteristics including the short-time load current characteristics and the long-time load current characteristics calculated by the load current characteristic calculating unit. The electronic circuit breaker according to claim 1, wherein the load current characteristic calculation unit calculates the long-term load based on the effective value calculated by the effective value calculation unit and the peak value calculated by the peak value calculation unit current characteristics. The electronic circuit breaker as described in claim 1 or 2 is provided with: The pre-alarm processing unit determines whether or not a pre-alarm is necessary based on the pre-alarm operating characteristic that specifies the pre-alarm current threshold value that is lower than the over-current determination specified by the over-current tripping operating characteristic the threshold value of the threshold value, and the overcurrent tripping action characteristic includes the overcurrent detection characteristics of each of the short-time trip processing unit and the long-time trip processing unit; and The recommended value calculation unit calculates the recommended value of the pre-alarm operating characteristic based on the information on the load current time limit characteristic and the information on the overcurrent tripping operating characteristic; and, The output unit outputs the advice value calculated by the advice value calculation unit. A circuit breaker system comprising: an electronic circuit breaker as described in claim 1 or 2; and An information processing device capable of being communicatively connected to the aforementioned electronic circuit breaker; The above-mentioned electronic circuit breaker is provided with a pre-alarm processing unit, and the pre-alarm processing unit determines whether or not the pre-alarm is necessary based on the pre-alarm operating characteristic that specifies the pre-alarm current threshold value, which is lower than or below the pre-alarm current threshold value. The threshold value of the overcurrent judgment threshold value specified by the overcurrent tripping action characteristic, which includes the overcurrent of each of the short-time trip processing unit and the long-time trip processing unit detection characteristics; The aforementioned information processing device is provided with: The communication part receives the information of the load current time limit characteristic and the information of the overcurrent tripping action characteristic from the electronic circuit breaker; and The recommended value calculation unit calculates the recommended value of the pre-alarm current threshold value based on the information on the load current time limit characteristics and the information on the overcurrent tripping operation characteristics received by the communication unit. The circuit breaker system according to claim 4, wherein the communication unit transmits the suggested value information including the information of the suggested value of the pre-alarm current threshold value calculated by the suggested value calculation unit to the electronic system breaker; The electronic circuit breaker includes a setting unit that sets the information of the advance alarm operation characteristic in the advance alarm processing unit based on the recommended value information transmitted from the information processing device. The circuit breaker system according to claim 4, wherein the communication unit transmits the suggested value information including the information of the suggested value of the pre-alarm current threshold value calculated by the suggested value calculation unit to the electronic system breaker; The said electronic circuit breaker is provided with the input part which has the knob for setting the information of the said advance alarm operation characteristic in the said advance alarm processing part.

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