CN114746974A - Electronic circuit breaker and circuit breaker system - Google Patents

Abstract

The electronic circuit breaker (1) is provided with a load current characteristic calculation unit (17) and an output unit (20). A load current characteristic calculation unit (17) calculates a short-time load current characteristic, which is a current characteristic of the load in the short-time region, on the basis of the peak value calculated by the peak value calculation unit (12), and calculates a long-time load current characteristic, which is a current characteristic of the load in the long-time region, on the basis of the effective value calculated by the effective value calculation unit (13). An output unit (20) outputs information on load current characteristics including the short-term load current characteristics and the long-term load current characteristics calculated by the load current characteristic calculation unit (17).

Description

Electronic circuit breakers and circuit breaker systems

technical field

The present invention relates to electronic circuit breakers and circuit breaker systems.

Background technique

Conventionally, in an electronic circuit breaker having a microcomputer or the like, the overcurrent tripping operating characteristics can be changed. Therefore, when the electronic circuit breaker is installed after the installation of the load device or the operation mode of the load device is changed, the overcurrent tripping operating characteristic can be changed without replacing the installed electronic circuit breaker. keep using it.

The operator who sets the operating characteristics of the overcurrent trip roughly calculates the current flowing through the load, that is, the load current, based on the product specifications of the full-load equipment connected to the electronic circuit breaker that constitutes the load. Then, the operator sets the overcurrent trip operation characteristic with a margin slightly larger than the load current.

However, in the above-mentioned work, man-hours are required to roughly calculate the load current according to the product specification of the load device, and thus a technique has been developed to facilitate the setting of the overcurrent tripping operation characteristics. For example, Patent Document 1 discloses an electronic circuit breaker that measures the maximum energization continuation time with respect to each load current value, and based on the measurement results, indicates the load current value and the maximum energization continuation time. The relationship between the characteristics is calculated as the maximum load time-limited characteristics. In this electronic circuit breaker, characteristic information including the maximum load time-limiting characteristic and the overcurrent tripping action characteristic is displayed on the display unit, and the overcurrent tripping action characteristic can be changed. As a result, in the electronic circuit breaker described in Patent Document 1, it is possible to facilitate the setting of the overcurrent tripping operation characteristics.

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

SUMMARY OF THE INVENTION

However, in the electronic circuit breaker described in Patent Document 1, an overcurrent is detected using an integrated current value obtained by integrating a current product obtained by multiplying the effective value of the load current by the sampling period. Therefore, in the electronic circuit breaker described in Patent Document 1, for example, when the load is a generator, when the starting current of the generator flows to detect a short-time overcurrent and the circuit is interrupted, there may be cases in which the circuit is interrupted. The maximum load time characteristic does not exceed the value specified by the short-time operation characteristic among the overcurrent tripping operation characteristics, and the overcurrent tripping operation characteristic cannot be properly performed.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to obtain an electronic circuit breaker having an overcurrent trip operation characteristic that can be appropriately performed by a user.

In order to solve the above-mentioned problems and achieve the object, the electronic circuit breaker of the present invention includes an open/close contact, a trip 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 processing unit. part, load current characteristic calculation part and output part. The opening and closing contacts open and close the circuit between the power supply and the load. The trip device changes the open and closed contacts from the closed state to the open state. The current detection unit detects the current flowing in the circuit. 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 causes the trip device to change the open-close contact from the closed state to the open state when it is determined that an overcurrent flows in the circuit in the short-time area based on the peak value calculated by the peak value calculation unit. The long-time trip processing unit determines, based on the effective value calculated by the effective value calculation unit, that an overcurrent flows in the circuit in a time-limited area longer than the short-time, that is, the long-time area, and causes the trip device to open and close the contact from the circuit. The closed state is set to the open state. The load current characteristic calculating unit calculates the short-time load current characteristic, which is the current characteristic of the load in the short-time region, based on the peak value calculated by the peak value calculating unit, and calculates the short-time 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, that is, the long-time load current characteristic is calculated. The output unit outputs information on the load current characteristics including the short-term load current characteristics and the long-term load current characteristics calculated by the load current characteristics calculation unit.

effect of invention

According to the present invention, there is an effect that the user can appropriately perform the overcurrent trip operation characteristic.

Description of drawings

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 an overcurrent trip operation characteristic and an advance warning operation characteristic according to Embodiment 1. FIG.

FIG. 3 is a diagram showing an example of the configuration of the information processing apparatus according to Embodiment 1. FIG.

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

FIG. 5 is a diagram showing another example of characteristic information displayed by the information processing apparatus according to Embodiment 1. 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.

7 is a diagram showing an example of an overcurrent tripping operation characteristic of the electronic circuit breaker according to Embodiment 1. 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 a load current characteristic calculation process performed by a processing unit of the electronic circuit breaker according to Embodiment 1. 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.

11 is a diagram showing an example of a load current when the load according to 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 in 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 in the seventh cycle and the 99th cycle shown in FIG. 11 .

24 is a diagram showing an example of a hardware configuration of a processing unit of the electronic circuit breaker according to Embodiment 1. FIG.

Detailed ways

Hereinafter, the electronic circuit breaker and the circuit breaker system according to the embodiment of the present invention will be described in detail based on the drawings. In addition, this invention is not limited to this embodiment.

Embodiment 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 , a circuit breaker system 100 according to Embodiment 1 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 smartphone, a tablet, or a portable computer. The electronic circuit breaker 1 and the information processing device 50 are communicably connected to each other by short-range wireless communication such as Bluetooth (registered trademark), for example.

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

The electronic circuit breaker 1 includes: an opening and closing contact 4 that opens and closes a circuit 6; a trip device 5 that changes the opening and closing contact 4 from a closed state to an open state; 6. The current flowing in the load 3, that is, the load current, is detected. The opening and closing contacts 4 have opening and closing contacts 4 ₁ to 4 ₃ that respectively open and close corresponding circuits among the three circuits 6 ₁ to 6 ₃ constituting the circuit 6 .

Each of the opening and closing contacts 4 ₁ to 4 ₃ has a fixed contact (not shown) and a movable contact (not shown). At each of the opening and closing contacts 4 ₁ to 4 ₃ , the movable contact and the fixed contact are brought into contact with each other to be in a closed state, and the power supply 2 and the load 3 provided in the electronic circuit breaker 1 are electrically connected. Thereby, electric current flows in each of the circuits 6 ₁ to 6 ₃ , and the electronic circuit breaker 1 is brought into an ON state.

In addition, at each of the opening and closing contacts 4 ₁ to 4 ₃ , the movable contact is separated from the fixed contact, the opening and closing contact 4 is changed from the closed state to the open state, and the power supply 2 and the load 3 are electrically cut off. Thereby, the current of each of the circuits 6 ₁ to 6 ₃ is interrupted, and the electronic circuit breaker 1 is brought into an open state.

The current detection unit 7 includes a plurality of current transformers 8 ₁ , 8 ₂ , and 8 ₃ that simulate analog proportional to the instantaneous value of the load current flowing in the corresponding circuit among the circuits 6 ₁ , 6 ₂ , and 6 ₃ The current signals are respectively output; and the voltage conversion unit 9 converts the plurality of analog current signals output from the current transformers 8 ₁ , 8 ₂ , and 8 ₃ to the 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 trip operation characteristic, which is an overcurrent detection characteristic, and determines whether or not the load current detected by the current detection unit 7 is an overcurrent based on the overcurrent trip operation characteristic. When it is determined that the load current is an overcurrent, the processing unit 10 outputs a trip signal S to the trip circuit 30 .

The trip circuit 30 drives the trip device 5 to cause the trip device 5 to perform a trip operation, for example, when the trip signal S is output from the processing unit 10 . The tripping operation is an operation to change the open/close contact 4 from the closed state to the open state. The input unit 31 includes a plurality of dials for setting information on the overcurrent tripping operating characteristic and advance warning operating characteristic, a measurement start button for causing 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, a lamp, or a display unit, and based on a request from the processing unit 10 , gives an advance warning by sound, light, or image.

The processing unit 10 has information on the advance warning operation characteristic, and based on the advance warning operation characteristic, determines whether or not the load current detected by the current detection unit 7 is in a state that should be advance warning. The processing unit 10 outputs a prior alert when it is determined that the load current is in a state that should be alerted in advance.

Here, the overcurrent trip operation characteristics and the advance warning operation characteristics will be described. FIG. 2 is a diagram showing an overcurrent trip operation characteristic and an advance warning operation characteristic according to Embodiment 1. FIG. In FIG. 2 , the horizontal axis represents the load current, and the vertical axis represents the operation time.

The overcurrent tripping operation characteristic is a characteristic showing the relationship between the overcurrent determination threshold value and the tripping operation time used for determining whether or not an overcurrent flows. The overcurrent tripping action characteristics of the electronic circuit breaker 1 include instantaneous tripping characteristics, short-time tripping characteristics, and long-time tripping characteristics. The instantaneous trip characteristic specifies the overcurrent judgment threshold value for the trip action in the instantaneous trip area, that is, the instantaneous trip action. The short-time tripping characteristic specifies the overcurrent judgment threshold for the tripping action in the short-time tripping area, that is, the short-time tripping action. The long-time trip characteristic specifies the overcurrent judgment threshold for the trip action in the long-time trip area, that is, the long-time trip action. In addition, in the following, the short-time trip area may be described as a short-time area, and the long-time trip area may be 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 determination threshold value and the pre-alarm operation time, and is output from the electronic circuit breaker 1 when the current that should be alarmed flows through the circuit 6 alarm. This warning is performed before the overcurrent flows in the circuit 6, and is therefore called a pre-warning.

In FIG. 2 , in addition to the overcurrent tripping action characteristic and the advance warning action characteristic, the maximum load current time limit characteristic is also shown. The maximum load current time-limit characteristic is a 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 is a characteristic showing the relationship between each load current value and the energization time. The energization time is a time compared with the operating time in the overcurrent tripping operating characteristic, and when the energizing time exceeds the operating time specified by the current tripping operating characteristic, the electronic circuit breaker 1 performs a tripping operation.

Returning to FIG. 1 , the processing unit 10 of the electronic circuit breaker 1 will be described. The processing unit 10 includes an AD (Analog-to-Digital) 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, a long-time trip processing unit 16, and a load current characteristic The calculation unit 17 , the advance warning processing unit 18 , the recommended value calculation unit 19 , the output unit 20 , the communication unit 21 , the setting unit 22 , and the storage 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 for each preset 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]. The AD conversion unit 11 outputs the converted 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 load current peak value Ipeak, which is the peak value of the load current flowing through the circuit 6, based on a plurality of digital signals output from the AD conversion unit 11 for each preset period T2. The period T2 is, for example, 20 [msec].

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

In addition, the effective value calculation unit 13 calculates the effective value of the load current flowing in the circuit 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 for each period T2. For example, the effective value calculation unit 13 obtains a moving average of values obtained by squaring the instantaneous value of the load current included in the digital signal output from the AD conversion unit 11, and calculates the square root of the result of the moving average, thereby obtaining Load current rms Irms.

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

The short-time trip processing unit 15 determines whether or not an overcurrent flows in the short-time region in the circuit 6 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 to the trip circuit 30 when the load current peak value Ipeak exceeds the overcurrent determination threshold value prescribed by the short-time trip characteristic for each period T2.

The long-term trip processing unit 16 determines whether or not an overcurrent flows in the region where the circuit 6 is in the long-term based on the load current effective value Irms. Specifically, the long-time trip processing unit 16 outputs the trip signal S from the output unit 20 to the trip circuit 30 when the effective value of the load current Irms exceeds the overcurrent determination threshold specified by the long-time trip characteristic for each period T2 . In addition, the long-time trip processing unit 16 can also determine whether or not an overcurrent flows in the long-time region of the circuit 6 based on the load current effective value Irms and the load current peak value Ipeak.

The load current characteristic calculation unit 17 calculates the 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 energization time by measuring the load current value during the period when the load current becomes the maximum.

Based on the load current peak value Ipeak, the load current time-limit characteristic in the short-time region, that is, the short-time load current characteristic is calculated. In addition, the load current characteristic calculation unit 17 calculates the long-time load current characteristic, which is a time-limited characteristic of the load current in the long-time area, based on the effective value of the load current Irms. The short-time load current characteristic is a characteristic showing the relationship between the load current in the short-time region and the energization time, and the long-time load current characteristic is the characteristic showing the relationship between the load current and the energization time in the long-time region.

As described above, the load current characteristic calculation unit 17 calculates the short-time load current characteristic based on the load current peak value Ipeak used for the determination of tripping in the short-time trip processing unit 15 , and uses the determination of tripping in the long-time trip processing unit 16 . The rms value of the load current, Irms, is used to calculate the long-term load current characteristics. Thereby, since the electronic circuit breaker 1 can present the load current time limit characteristic matching the overcurrent tripping operation characteristic to the user, the user can appropriately perform the overcurrent tripping operation 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 actuate the measurement start button at the start timing of the period in which the load current becomes the maximum state, and the load current characteristic calculation unit 17 can calculate the maximum load current time-limit characteristic. The load current characteristic calculation unit 17 stores the information of the calculated load current time-limit characteristic in the storage unit 23 in association with the information of the measurement period. In addition to the information on the load current time limit characteristics, the storage unit 23 also stores information on the overcurrent trip operation characteristics and information on the advance warning operation characteristics.

The advance warning processing unit 18 determines whether or not to output the advance warning to the notification unit 32 based on the load current effective value Irms. The advance warning processing unit 18 has information on the advance warning operation characteristics. 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 outputs an advance warning to the notification unit 32 when it is determined that the load current effective value Irms exceeds the advance warning current threshold value Ip.

The recommended value calculation unit 19 calculates the recommended value of the advance warning operation characteristic based on the information of the load current time limit characteristic and the information of the overcurrent trip operation characteristic. For example, the recommended value calculation unit 19 calculates the recommended value of the advance warning operation characteristic so as to be an intermediate characteristic between the load current time limit characteristic and the overcurrent trip operation characteristic. The recommended value calculation unit 19 stores the calculated recommended value of the advance warning action characteristic in the storage unit 23 . In addition, the electronic circuit breaker 1 may not include the recommended value calculation unit 19 .

The output unit 20 outputs a trip signal S to the trip circuit 30 based on 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 performs short-range wireless communication such as Bluetooth, and performs communication with the information processing device 50 . 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 , the communication unit 21 stores in the storage unit 23 the characteristics representing the overcurrent tripping operation, the advance warning 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 trip operation characteristic and the information of the advance warning operation characteristic based on the user's operation to the input unit 31 or the information output from the communication unit 21 . For example, the setting unit 22 sets new information on the overcurrent trip operation characteristics in the short-time trip processing unit 15 and the long-time trip processing unit 16 based on the user's operation to the input unit 31 or the information output from the communication unit 21 , so that the The information on the new overcurrent tripping operating characteristics is stored in the storage unit 23 . In addition, the setting unit 22 sets the information of the new advance alarm operation characteristic in the advance alarm processing unit 18 based on the operation of the user to the input unit 31 or the information output from the communication unit 21, and stores the information of the new advance alarm operation characteristic in the storage 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 is a diagram showing an example of the configuration of the information processing apparatus according to Embodiment 1. FIG. FIG. 4 is a diagram showing an example of characteristic information displayed by the information processing apparatus according to Embodiment 1. FIG. FIG. 5 is a diagram showing another example of characteristic information displayed by the information processing apparatus according to Embodiment 1. FIG.

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 storage unit 55 . The communication unit 51 performs short-range wireless communication such as Bluetooth, and performs communication with the electronic circuit breaker 1 . The display unit 52 is, for example, an LCD (Liquid Crystal Display) or an organic EL (ElectroLuminescence) display. The input unit 53 includes, for example, a keyboard, a mouse, an auxiliary keyboard, a touch panel, or the like.

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 based on the user's operation on the input unit 53 . The control unit 54 acquires from the communication unit 51 the characteristic information transmitted from the electronic circuit breaker 1 in response to the information transmission request and received by the communication unit 51 , and stores the acquired characteristic information in the storage unit 55 . The control unit 54 acquires characteristic information from the storage unit 55 based on the user operation on the input unit 53 , 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 recommended value calculation unit 62 . The display processing unit 60 acquires information for generating the characteristic information and the updated image from the storage unit 55 , and can cause the display unit 52 to display the updated image 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 indicating the current setting value, and a new setting value input area. Box display area 73 . The update image 70 includes a setting value change bar 74 , an acquisition button 75 , a recommended value calculation button 76 , a recommended value setting button 77 , an update button 78 , and a write button 79 .

In the characteristic display area 71, graphs representing the overcurrent trip operation characteristic, the advance warning operation characteristic, and the load current time limit characteristic are arranged. The current set value display area 72 displays the current set values of each characteristic, namely “Iu”, “TL”, “Is”, “Ts”, “Ii” and “Ip”. "Iu" is a continuous energization 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 operation time that specifies the operation time in the long-time trip area. "Is" shown in FIG. 5 is an overcurrent determination threshold value in the short-time tripping region, that is, a short-time operating current threshold value, and is set within a range of, for example, 1.5 to 10 times the rated current In. "Ts" is the short-time trip operation time that specifies the operation time in the short-time trip area. "Ii" is the overcurrent determination threshold in the instantaneous trip area. "Ip" is the pre-alarm current threshold.

The box display area 73 includes text boxes into which new setting values of the respective characteristics can be input, and the user of the information processing apparatus 50 can input new setting values into the respective text boxes by operating the input unit 53 .

The setting value change bar 74 is a GUI (Graphical User Interface) for changing the setting of the characteristic selected by the operation on 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 change bar 74 by operating the input unit 53 .

The acquisition button 75 is a GUI button for acquiring information on the load current time limit characteristic from the electronic circuit breaker 1 . By operating the acquire button 75, the user transmits to the electronic circuit breaker 1 a load characteristic transmission request requesting information on the load current time limit characteristic, and acquires the load transmitted from the electronic circuit breaker 1 in response to the load characteristic transmission request Information on current time limit characteristics.

The recommended value calculation button 76 is a GUI button for calculating the recommended value of the advance warning action characteristic. When the recommended value calculation button 76 is operated by the user, the recommended value calculation unit 62 of the control unit 54 calculates the recommended value of the advance warning operation characteristic based on the information of the load current time limit characteristic and the information of the overcurrent trip operation characteristic. calculate. For example, the recommended value calculation unit 62 calculates the recommended value of the advance warning operation characteristic so as to be an intermediate characteristic between the load current time limit characteristic and the overcurrent trip operation characteristic. Then, the display processing unit 60 arranges the recommended advance warning operation characteristic in the characteristic display area 71 based on the recommended value of the advance warning operation characteristic calculated by the recommended value calculation unit 62 . In addition, the display processing unit 60 can also input the recommended value of the advance warning action characteristic calculated by the recommended value calculation unit 62 into the text box of the frame display area 73 .

In addition, the information processing device 50 may be configured without the recommended value calculation unit 62 . In this case, the control unit 54 of the information processing device 50 transmits a recommended value calculation request 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 recommended value calculation unit 19 transmits the information of the recommended 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, via the communication unit 51 , information on the recommended value of the advance warning operation characteristic. The display processing unit 60 arranges the recommended advance warning operation characteristic in the characteristic display area 71 based on the recommended value of the advance warning operation characteristic calculated by the electronic circuit breaker 1 . In addition, the display processing unit 60 can also input the recommended value of the advance warning operating characteristic calculated by the electronic circuit breaker 1 into the text box of the box display area 73 .

The recommended value setting button 77 is a GUI button for setting the recommended value of the advance warning operating characteristic in the electronic circuit breaker 1 as a new setting value of the advance warning operating characteristic. When the recommended value calculation button 76 is operated by the user, the recommended value calculation unit 62 of the control unit 54 calculates the recommended value of the advance warning operation characteristic. Then, 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 including the recommended value of the advance warning operation characteristic as a new set value of the advance warning operation characteristic send. The setting unit 22 of the electronic circuit breaker 1 acquires the setting request information via the communication unit 21, and uses the recommended value of the advance warning operating characteristic included in the acquired setting request information as a new setting value of the advance warning operating characteristic Instead, it is set in the advance warning 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 into the text box of the frame display area 73 . When the user operates the setting value change bar 74 , 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 box of the frame display area 73 .

The write button 79 is a GUI button for setting a new setting value input to the text box of the box display area 73 in the electronic circuit breaker 1 . When the write button 79 is operated by the user, the setting processing unit 61 of the control unit 54 causes the communication unit 51 to set the setting including the new setting value input to the text box of the box display area 73 . The request information is transmitted to the electronic circuit breaker 1 . The setting unit 22 of the electronic circuit breaker 1 acquires the setting request information via the communication unit 21 , and sets the information included in the acquired setting request information in the short-time trip processing unit 15 and the long-time trip processing unit 16 . and 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 processing performed by the processing unit of the electronic circuit breaker according to Embodiment 1, which is repeatedly executed for each processing routine time ΔTroop.

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

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 current effective value Irms based on the digital value output from the AD conversion unit 11 (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 it is determined that the load current effective value Irms exceeds the advance warning current threshold value Ip (step S12: Yes), the processing unit 10 determines whether the load current effective value Irms calculated in the step S11 exceeds the short-time operating current threshold value Is (step S13). ). When it is determined that the effective load current value Irms exceeds the short-time operating current threshold value Is (step S13: Yes), the processing unit 10 multiplies the processing routine time ΔTroop by the short-time operating current with respect to the current accumulated current value S1. The current product obtained by the square value Is ² of the threshold value Is is added to the previous accumulated current value S2, and the previous accumulated current value S2 is set to be the same as the current accumulated current value S1 in order to perform the next processing routine. value (step S14).

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

In step S13 shown in FIG. 6 , when it is determined that the effective load current value 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). Then, the processing unit 10 adds the current product obtained by multiplying the processing routine time ΔTroop by the square value Irms ² of the effective load current value Irms to the previous accumulated current value S2 with respect to the current accumulated current value S1, and then in order to The next processing routine is performed, and the previous accumulated current value S2 is set to the same value as the current accumulated current value S1 (step S16).

When determining that the effective load current value Irms does not exceed the advance warning current threshold value Ip (step S12: No), the processing unit 10 determines whether the overcurrent excess flag Flg is "1" (step S18). When it is determined that the overcurrent excess flag Flg is "1" (step S18: Yes), the processing unit 10 jumps to the residual current product correction process in step S19.

Specifically, the processing unit 10 subtracts the current product obtained by multiplying the processing routine time ΔTroop by the heat dissipation coefficient P from the previous accumulated current value S2 with respect to the current accumulated current value S1, and then performs the next processing routine. , the previous 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 routine time ΔTroop by the heat dissipation coefficient P from the previous accumulated current value S2, when the effective load current value Irms is less than or equal to the prior warning current threshold value Ip, the current accumulated The value corresponding to cooling is subtracted from the current value S1. 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 it is determined 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 S20: Yes) S21), the overcurrent excess flag Flg is set to "0" (step S22).

The processing unit 10 determines whether the current accumulated current value S1 is greater than or equal to the constant K when the processing of step S14 is completed or when the processing of step S16 is completed (step S17 ). The constant K is an overcurrent determination threshold value defined by a preset long-time trip characteristic in the overcurrent trip operation region. The long-time trip characteristic is set based on the value of "TL" shown in Figure 5 . "TL" represents, for example, the long-time trip operation time when a load current twice as large as the rated current In flows.

In the long-time trip characteristic of FIG. 7 , the long-time trip operation 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 accumulated current value S1 is not greater than or equal to the constant K (step S17: No), and determines that the overcurrent excess flag Flg is not “1” (step S18: No) , when it is determined that the current accumulated current value S1 is not a value smaller than "0" (step S20: No), or when the process of step S22 ends, the short-time counter process is performed (step S23). This short-time counter processing is the processing of steps S30 to S33 shown in FIG. 8 , and will be described in detail later.

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

When it is determined by the short-time trip processing unit 15 that the short-time counter STD1 is not greater than or equal to the constant L this time (step S24: No), the processing unit 10 performs load current characteristic calculation processing (step S25), and transfers the processing to step S24. S11 jumps. This load current characteristic calculation process is the process of steps S40 to S44 shown in FIG. 9 , and will be described in detail later.

When the processing unit 10 determines that the current short-time counter STD1 is greater than or equal to the constant L (step S24: Yes), or when it is determined that the current accumulated current value S1 is greater than or equal to the constant K (step S17: Yes) ), the trip signal S is output to the trip circuit 30, and the trip device 5 changes the open-close contact 4 from the closed state to the open state (step S26), and the process shown in FIG. 6 ends.

In addition, the process of step S11 is performed by the effective value calculation part 13 of the processing part 10, and the process of steps S12-S22 is performed by the long-time trip processing part 16 of the processing part 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.

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 it is determined that the load current peak value Ipeak exceeds the short-time operating current threshold value Is (step S31: Yes), the short-time trip processing unit 15 adds "1" to the value of the previous short-time counter STD2 as a value obtained by adding "1". The value of the short-time counter STD1 of this time is set to the same value as the value of the short-time counter STD1 of the previous time to perform the next processing routine (step S32).

In addition, when it is determined that the load current peak value Ipeak does not exceed the short-time operating current threshold value Is (step S31: No), the short-time trip processing unit 15 subtracts “1” from the value of the previous short-time counter STD2. The value of the short-time counter STD1 this time is set, and the value of the previous short-time counter STD2 is set to the same value as the short-time counter STD1 of this time in order to perform 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 when the process of step S33 ends.

9 is a flowchart showing an example of a load current characteristic calculation process performed by a processing unit of the electronic circuit breaker according to Embodiment 1. FIG. 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 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 be configured to calculate the current accumulated current value S1 by the same calculation as that of the long-time trip processing unit 16 .

Then, the load current characteristic calculation unit 17 calculates the energization times TxS[1] to TxS[I1level]. When the current level Ilevel less than or equal to 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", and represents the current level Ilevel.

TxS[x]=ΔTroop×S1/(x/Imin) ² (1)

Specifically, the load current characteristic calculation unit 17 divides the current accumulated current value S1 by multiplying the respective current levels Ilevel[1] to Ilevel[I1level] up to the current current level I1level by the unit current. The value obtained by squaring the value Imin is used to obtain the values of the maximum current counters Icntm[1] to Icntm[I1level]. Then, the load current characteristic calculation unit 17 calculates the energization times TxS[1] to TxS[I1level] by multiplying the respective values of the maximum current counters Icntm[1] to Icntm[I1level] by the processing routine time ΔTroop.

The accumulated current value S1 this time is calculated based on the effective value of the load current Irms. Therefore, the energization time TxS that matches the long-term tripping area of the overcurrent tripping action characteristic can be obtained through step S40, but when it is less than or equal to the pre-alarm current threshold value When the load current of Ip continues to flow, the process of step S19 shown in FIG. 6 is performed. Therefore, when the load current less than or equal to the advance warning current threshold value Ip continues to flow, the current accumulated current value S1 becomes "0", so the energization time TxS[x] cannot be calculated. In addition, in the short-time trip area and the instantaneous trip area, the overcurrent trip operation is performed based on the load current peak value Ipeak, so the energization time that matches the short-time trip area and the instantaneous trip area in the tripping operation characteristics cannot be obtained.

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

Next, the load current characteristic calculation unit 17 determines whether or not 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 it is determined that the value of the energization time TxS[x] is greater than the value of the energization time TxP[x] (step S42: Yes), the load current characteristic calculation unit 17 sets the value of the energization time TxS[x] to the maximum energization time value of 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] value. In addition, when the value of the energization time TxS[I1level] is greater than the value of the energization time TxP[I1level], 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] value.

In addition, when it is determined 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 load current characteristic calculation unit 17 sets the value of the energization time TxP[x] is the maximum energization time Txmax[x] (step S44). For example, when the value of the energization time TxS[1] is not greater than the value of the energization time TxP[1], the load current characteristic calculation unit 17 sets the value of the energization time TxP[1] as the maximum energization time Txmax[1] . In addition, the load current characteristic calculation unit 17 sets the value of the energization time TxP[I1level] as 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] .

As described above, the load current characteristic calculation unit 17 uses the larger value among the value of the energization time TxS[x] and the value of the energization time TxP[x]. Thus, for example, when there is a period in which the load current periodically fluctuates and becomes less than or equal to the advance warning current threshold value Ip, the energization time TxP[x] is used. Therefore, the load current time-limited characteristic can be calculated more appropriately from the viewpoint of setting the pre-alarm operation characteristic as a reference, for example.

When the process of step S43 is completed, or when the process of step S44 is completed, the load current characteristic calculation unit 17 stores the maximum energization time Txmax[x] in the storage unit 45 and updates the information on the load current time limit characteristic (step S45). When the processing of step S45 is completed, the load current characteristic calculation unit 17 completes the processing shown in FIG. 9 .

The load current characteristic calculation unit 17 repeats the above-described processing, whereby the storage unit 45 can store the load current time-limited characteristic information including the information of the maximum energization time Txmax[n] of each current level Ilevel.

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

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 in 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. In addition, "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] that is less than or equal to the current current level I1level 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 , among the current counters Icnt[1] to Icnt[n], the current current counters Icnt[1] to Icnt[I1level] that are less than or equal to the current current level I1level are respectively set to add "1" to the value.

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 it is determined 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 Icnt whose current level Ilevel is greater than the current current level I1level It is set to "0" (step S53).

Specifically, the load current characteristic calculation unit 17 associates the current current counter with 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 The values of Icnt[I1level+1] to Icnt[I0level] return to "0".

Next, 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), the load current characteristic calculation unit 17 determines that this time Whether the value of the current counter Icnt[x] is 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 or not the respective values of the current counters Icnt[1] to Icnt[I1level] are larger than the corresponding maximum current counters among the plurality of maximum current counters Icntm[1] to Icntm[I1level] The value of Icntm.

When it is determined that the value of the current counter Icnt[x] is larger than the value of the maximum current counter Icntm[x] (step S54: Yes), the load current characteristic calculation unit 17 sets the value of the maximum current counter Icntm[x] is the same value as the current counter Icnt[x] (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 The same value for Icnt[1]. 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 greater than the value of the maximum current counter Icntm[1].

In addition, when the value of the current counter Icnt[I1level] is larger than the value of the maximum current counter Icntm[I1level], 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 Same value for Icnt[I1level]. 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, when the process of step S55 is completed, or when it is determined that the value of the current counter Icnt[x] is not larger than the value of the maximum current counter Icntm[x] (step S54 ) : No), a value obtained by multiplying the value of the maximum current counter Icntm[x] by the processing routine time ΔTroop is calculated 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 multiplies the respective values of the maximum current counters Icntm[1] to Icntm[Ilevel] by the processing routine time ΔTroop, thereby calculating the energization times TxP[1] to TxP [Ilevel] is calculated. 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. 11 is a diagram showing an example of a load current when the load according to Embodiment 1 is a generator. When the load 3 is a generator, it is assumed that the starting current flows as shown in FIG. 11 . In FIG. 11 , the vertical axis represents the instantaneous value of the load current, and the horizontal axis represents time. In addition, each cycle of the horizontal axis shows the cycle of the processing routine time ΔTroop.

In the example shown in FIG. 11 , the peak value of the load current is the largest in the first cycle, and thereafter, the generator accelerates up to the rated speed and the peak value decreases. Specifically, the load current shown in FIG. 11 has the maximum peak value in the first cycle and is 500% In. In addition, the extreme value of the load current decreases with the passage of time, the peak value in the fifth cycle becomes 50% In, and the peak value in the sixth cycle and later remains at 50% In. "500% In" represents a value of 500% of the rated current In, and "50% In" represents a value of 50% of the rated current In.

Hereinafter, the unit current value Imin is set to 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 previous current level I0level[i] The initial value of 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 in 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 performs the calculation of I1level=Ipeak/Imin=500%In/50%In in the process of step S50 shown in FIG. 10 as the current time The current level I1level is calculated as "10".

The current current counters Icnt of the current level Ilevel less than or equal to 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 "0". Therefore, in step S55 shown in FIG. 10 , the processing unit 10 sets “1”, which is the value of each of the maximum current counters Icntm[1] to Icntm[10], to be the same as the current current counters Icnt[1] to Icnt[10 ] Corresponding to the current value of the current counter Icnt.

Next, the processing unit 10 multiplies the processing routine time ΔTroop by the value of the maximum current counters Icntm[1] to Icntm[10] in step S56 shown in FIG. ]Calculation. Since the processing routine time ΔTroop is 20 ms, the respective energization times TxP[1] to TxP[10] are 20 ms.

Next, the processing of the processing unit 10 in the second cycle will be described. In the second cycle, the load current peak value Ipeak is 400%In. Therefore, in the processing of step S50 shown in FIG. 10 , the processing unit 10 calculates the current level I1level by Ipeak/Imin=400%In/50%. "8" is calculated as the current level I1level of this time.

The current current counter Icnt of the current level Ilevel less than or equal to the current current level I1level is the current current counter 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 .

In step S54 shown in FIG. 10 , the processing unit 10 determines whether or not the value of each of the current current counters Icnt[1] to Icnt[8] is larger than the corresponding maximum current value among the maximum current counters Icntm[1] to Icntm[8] The value of the current counter Icntm. The current values of the current counters Icnt[1] to Icnt[8] are "2", which are 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”, which is the value of each of the maximum current counters Icntm[1] to Icntm[8], to be the same as the current current counters Icnt[1] to Icnt[8 ] Corresponding to the current value of the current counter Icnt.

As shown in FIGS. 15 to 19 , the processing unit 10 also performs the same processing as the first cycle and the second cycle for the respective cycles from the third cycle to the 99th cycle. ]Calculation. Thereby, the processing unit 10 can calculate the energization time TxP that matches 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 divides the current accumulated current value S1 by multiplying each of the plurality of current levels Ilevel up to the current current level I1level by the unit current value Imin. The value of the maximum current counter Icntm[x] is obtained by squaring the value of . In addition, below, the unit current value Imin is set to 50% In.

In the example shown in FIG. 20 , in the first cycle, the load current effective value Irms is 500% In, and the previous accumulated current value S2 is 0. Therefore, the current level I1level this time 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, so the value of the maximum current counter Icntm[1] calculated by the processing unit 10 is “2” as shown in FIG. 20 . In addition, since the value of the current counter Icnt[2] this time is 5000÷(2×50) ² =0.5, the value of the maximum current counter Icntm[2] calculated by the processing unit 10 is rounded to “1” as shown in FIG. 20 . ".

In addition, since the value of the current counter Icnt[3] this time is 5000÷(3×50) ² =0.2, by rounding off, the value of the maximum current counter Icntm[3] calculated by the processing unit 10 is shown in FIG. 20 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 .

In the TxS update process shown in FIG. 9 , the processing unit 10 multiplies the value of each of the maximum current counters Icntm[1] to [10] by the processing routine time ΔTroop, and thereby the energization times TxS[1] to TxS[10 ]Calculation. The energization time TxS[1] is Icntm[1]×ΔTroop=2×20=40[ms]. The energization time TxS[2] is Icntm[2]×ΔTroop=1×20=20[ms]. In addition, the energization times TxS[3] to TxS[10] are 0 [ms].

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

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

In addition, since the value of the current counter Icnt[3] this time is 8200÷(3×50) ² =0.36, by rounding off, the value of the maximum current counter Icntm[3] calculated by the processing unit 10 is shown in FIG. 20 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. 21 .

The processing unit 10 calculates the energization times TxS[1] to TxS[10] by multiplying the values of the respective maximum current counters Icntm[1] to [10] by the processing routine time ΔTroop. The energization time TxS[1] is Icntm[1]×ΔTroop=3×20=60[ms]. The energization time TxS[2] is Icntm[2]×ΔTroop=2×20=20[ms]. In addition, the energization time TxS[3] to TxS[10] are 0 ms.

As shown in FIGS. 21 to 23 , the processing unit 10 also performs the same processing as the first cycle and the second cycle for each cycle from the third cycle to the 99th cycle. 10] to perform the calculation. Thereby, the processing unit 10 can calculate the energization time TxS that matches the effective value of the load current Irms.

24 is a diagram showing an example of a hardware configuration of a processing unit of the electronic circuit breaker according to Embodiment 1. FIG. 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, for example, via the bus 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, the long-time trip processing unit 16, Functions of 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 or more of a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a system LSI (Large Scale Integration).

The memory 102 includes one or more of RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically 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 one or more of nonvolatile or volatile semiconductor memory, magnetic disk, flexible memory, optical disk, compact disk and DVD (Digital Versatile Disc). In addition, the electronic circuit breaker 1 may include integrated circuits such as ASIC (Application Specific Integrated Circuit) and FPGA (Field Programmable Gate Array).

In addition, the control unit 54 of the information processing apparatus 50 is constituted by the processor 101, the memory 102, the AD converter 103, the input/output interface 104, and the bus 106 shown in FIG. 24 . 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 according to the first embodiment includes the open/close 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 opening and closing contact 4 opens and closes the circuit 6 between the power source 2 and the load 3 . The trip device 5 changes the open/close contact 4 from the closed state to the open state. The current detection unit 7 detects the current flowing in the circuit 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 effective value of the load current Irms, which is an effective value of the current detected by the current detection unit 7 . The short-time trip processing unit 15 causes the trip device 5 to change the open-close contact 4 from the closed state to the open state when it is determined based on the load current peak value Ipeak that an overcurrent flows in the circuit 6 in the short-time region. The long-time trip processing unit 16 causes the trip device 5 to close the opening and closing contacts 4 when it is determined that an overcurrent flows in the circuit 6 in a region that is longer than the short-time, that is, the long-time, based on the effective value of the load current Irms. The state is set to open circuit state. The load current characteristic calculation 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 load 3 in the long-time region based on the load current effective value Irms The current characteristics of , that is, the long-term load current characteristics are calculated. The output unit 20 outputs information on the load current time-limit characteristics including the short-time load current characteristics and the long-time load current characteristics calculated by the load current characteristic calculation unit 17 . Thereby, since the electronic circuit breaker 1 can present the load current time limit characteristic matching the overcurrent tripping operation characteristic to the user, the user can appropriately perform the overcurrent tripping operation 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. As a result, the electronic circuit breaker 1 can accurately calculate the long-term load current characteristics.

In addition, the electronic circuit breaker 1 includes an advance warning processing unit 18 and a recommended value calculating unit 19 . The pre-alarm processing unit 18 determines whether or not pre-alarm is necessary based on the pre-alarm current threshold Ip, which is a threshold value lower than the over-current determination threshold defined by the over-current trip operational characteristic. The recommended value calculation unit 19 calculates the recommended value of the advance warning operation characteristic based on the information of the load current time limit characteristic and the information of the overcurrent trip operation characteristic. Thereby, in the electronic circuit breaker 1, the user can appropriately perform an advance warning operation characteristic.

In addition, the circuit breaker system 100 according to Embodiment 1 includes the electronic circuit breaker 1 and the information processing device 50 communicably connected to the electronic circuit breaker 1 . The electronic circuit breaker 1 includes a pre-alarm processing unit 18 that determines whether or not pre-alarm is necessary based on a predetermined pre-alarm current threshold Ip, which is a threshold value lower than an over-current determination threshold defined for the over-current tripping operational characteristic. . The information processing device 50 includes a communication unit 51 and a recommended 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 the recommended value of the advance warning current threshold value Ip based on the information on the load current time limit characteristics and the information on the overcurrent trip operation characteristics received by the communication unit 51 . Thereby, in the circuit breaker system 100, the user can appropriately perform an advance warning operation characteristic.

Further, the communication unit 51 transmits recommended value information including information on the recommended value of the advance warning current threshold value Ip calculated by the recommended value calculation unit 62 to the electronic circuit breaker 1 . The electronic circuit breaker 1 has a setting unit 22 that sets information on the advance warning operation characteristic 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 an advance warning operation characteristic.

Further, the communication unit 51 transmits recommended value information including information on the recommended value of the advance warning current threshold value Ip calculated by the recommended value calculation unit 62 to the electronic circuit breaker 1 . The electronic circuit breaker 1 has an input unit 31 having a dial for setting information on the advance warning operation characteristic in the advance warning processing unit 18 . Thereby, in the circuit breaker system 100, the user can appropriately perform an advance warning operation characteristic.

The configurations shown in the above embodiments represent an example of the contents of the present invention, and can be combined with other known technologies, and a part of the configurations can be omitted or changed without departing from the gist of the present invention.

Description of the label

1 electronic circuit breaker, 2 power supply, 3 load, 4, 4 ₁ , 4 ₂ , 4 ₃ open/close contacts, 5 trip device, 6, 6 ₁ , 6 ₂ , 6 ₃ circuits, 7 current detection section, 9 Voltage conversion part, 10 processing part, 11AD conversion part, 12 peak value calculation part, 13 effective value calculation part, 14 instantaneous trip processing part, 15 short time trip processing part, 16 long time trip processing part, 17 load current characteristic calculation part, 18 Advance warning processing unit, 19, 62 Recommended value calculation unit, 20 output unit, 21, 51 communication unit, 22 setting unit, 30 trip circuit, 31, 53 input unit, 32 notification unit, 50 information processing device, 52 display part, 54 control part, 55 storage part, 60 display processing part, 61 setting processing part, 100 circuit breaker system.

Claims (6)

1. An electronic circuit breaker, comprising:

an opening/closing contact for opening/closing an electric circuit between a power supply and a load;

a trip device for setting the opening/closing contact from a closed state to an open state;

a current detection unit that detects a current flowing through the circuit;

a peak value calculation unit that calculates a peak value of the current detected by the current detection unit;

an effective value calculation unit that calculates an effective value of the current detected by the current detection unit;

a short-time trip processing unit that causes the trip device to set the open/close contact from a closed state to an open state when it is determined that an overcurrent flows through the circuit in a short-time region based on the peak value calculated by the peak value calculation unit;

a long-time trip processing unit that causes the trip device to set the opening and closing contacts from a closed state to an open state when it is determined that an overcurrent flows through the circuit in a region of a long time that is a time limit longer than the short time limit based on the effective value calculated by the effective value calculation unit;

a load current characteristic calculation unit that calculates a short-time load current characteristic that is a current characteristic of the load in the short-time region based on the peak value calculated by the peak value calculation unit, and calculates a long-time load current characteristic that is a current characteristic of the load in the long-time region based on the effective value calculated by the effective value calculation unit; and

and an output unit that outputs information of load current time-limit characteristics including the short-time load current characteristics and the long-time load current characteristics calculated by the load current characteristic calculation unit.

2. The electronic circuit breaker according to claim 1,

the load current characteristic calculation unit calculates the load current characteristic in the long term based on the effective value calculated by the effective value calculation unit and the peak value calculated by the peak value calculation unit.

3. The electronic circuit breaker according to claim 1 or 2, characterized by having:

a pre-alarm processing unit that determines whether or not a pre-alarm is required based on a pre-alarm operation characteristic that defines a pre-alarm current threshold that is a threshold lower than an overcurrent determination threshold defined by an overcurrent trip operation characteristic that includes the overcurrent detection characteristic of each of the short-time trip processing unit and the long-time trip processing unit; and

a recommended value calculation unit that calculates a recommended value of the pre-warning operation characteristic based on the information on the load current time limit characteristic and the information on the overcurrent trip operation characteristic,

the output unit outputs the recommended value calculated by the recommended value calculation unit.

4. A circuit breaker system having:

the electronic circuit breaker of claim 1 or 2; and

an information processing device communicably connected to the electronic circuit breaker,

the electronic circuit breaker includes a pre-alarm processing unit that determines whether or not a pre-alarm is required based on pre-alarm operating characteristics that define a pre-alarm current threshold that is a threshold lower than an overcurrent determination threshold defined by overcurrent trip operating characteristics including the overcurrent detection characteristics of the short-time trip processing unit and the long-time trip processing unit,

the information processing apparatus includes:

a communication unit that receives the information on the load current time limit characteristic and the information on the overcurrent trip operation characteristic from the electronic circuit breaker; and

and a recommended value calculation unit that calculates a recommended value of the prior alarm current threshold value based on the information on the load current time limit characteristic and the information on the overcurrent trip operation characteristic received by the communication unit.

5. The circuit breaker system of claim 4,

the communication unit transmits recommended value information including information of the recommended value of the pre-warning current threshold calculated by the recommended value calculation unit to the electronic circuit breaker,

the electronic circuit breaker includes a setting unit that sets the information of the pre-alarm operation characteristic in the pre-alarm processing unit based on the recommended value information transmitted from the information processing device.

6. The circuit breaker system of claim 4,

the communication unit transmits recommended value information including information of the recommended value of the pre-warning current threshold calculated by the recommended value calculation unit to the electronic circuit breaker,

the electronic circuit breaker includes an input unit having a dial for setting information of the pre-alarm operation characteristic to the pre-alarm processing unit.

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