JP2010063247A - Working state monitoring controller and circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working state monitoring controller and a circuit breaker which stop power supply to an electric circuit automatically when a decision is made that a construction work using an electrical device for work has ended and no work is done in a construction site, or the like. <P>SOLUTION: A working state monitoring controller includes: an apparatus use state detection means for detecting a use state of an electrical device for work which is connected to an electric circuit and used and outputting a signal according to the use state of the electrical device for work; a decision means for deciding whether a work using an electrical device for work has ended or not based on a signal output from the apparatus use state detection means and outputting a signal when a decision is made that the work has ended; and an output circuit which is driven based on a signal output from the decision means and delivering the output signal to the outside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an apparatus and a circuit for monitoring an energization state of a working electric device or the like used by being connected to an electric circuit, and automatically cutting off and controlling power supply to the electric circuit according to the energization state of the working electric device. Regarding circuit breakers.

Temporary distribution boards are installed at construction sites, etc., where power usage is required for a certain period of time, depending on the progress of work, to supply power to the work electrical equipment. We are doing construction work.

As such a temporary distribution board, for example, a distribution board as disclosed in Patent Document 1 is used. The temporary distribution board includes a main switch and a branch switch connected to the load side of the main switch in a casing that forms an outer shell. The main switch in the housing is connected by drawing in the wire constituting the primary circuit of the distribution board, and the branch switch is connected by drawing in the cable constituting the secondary circuit of the distribution board. , Used to supply power to the working electrical equipment.
Japanese Patent Laid-Open No. 2001-157328 FIG.

As described above, the temporary distribution board is often used by turning on the main switch and branch switch at the start of each day and turning off at the end of work.

However, at construction sites, etc., it is common for a large number of workers in various industries, such as civil engineering work, building work, and plumbing work to enter and exit the work, and the main switch installed in the temporary distribution board and The ON / OFF operation of the branch switch is usually performed by each contractor or worker as necessary.

And at the end of each day's work, who is responsible for turning off the switch depends on the progress of the work at that time and the workers entering and leaving, and the switch is not turned off even after the end of work. In the case of forgetting to turn off the switch, there are cases where power is continuously supplied to the working electrical equipment until the next day's work starts.

When the switch is not turned off even after the work is completed in this way and the power continues to be supplied to the electric circuit, there are the following disadvantages.

First, there is an environmental problem as extra energy is consumed.

For example, the power consumption when using an AC arc welding machine used for welding at a construction work site is about 1 kW to several kW, depending on the output, and standby power is 200 W to 300 W per unit. Degree.

In other words, as long as power is continuously supplied to the welding machine, the standby power alone will continue to consume hundreds of watts of extra power, resulting in a high environmental load such as CO ₂ emissions. is there.

Temporarily, the standby electric energy for 15 hours at night from the end of work (17:00) to the start of the next morning (8:00) is 200 W × 15 h = 3 kWh. In January, 3 kWh × 30 days = 90 kWh, and in 1 year, 90 kWh × 12 months = 1080 kWh. According to the “Enforcement Ordinance on Promotion of Global Warming Countermeasures”, this is equivalent to about 50 kg of carbon dioxide in one month and equivalent to about 600 kg of carbon dioxide in one year when converted to carbon dioxide. The amount to be.

Second, there are safety issues.

Electrical circuits at temporary sites are mostly electric wires and equipment for movement, and electrical and mechanical protection is often insufficient compared to other facilities. If electricity supply is continued in such an electric circuit and in an unattended state, there is a risk that a discovery will be delayed and a fire may occur if an accident such as a short circuit or a leakage occurs.

In addition, when changing the wiring of equipment at the start of work, it may be mistaken that the switchboard of the temporary distribution board is turned off the previous day, and the live parts may be touched directly, resulting in electric shock and personal injury. is there. For this reason, it is desirable that the switch is turned off after the work is completed at the construction work site.

Therefore, the object of the present invention is to automatically supply power to the electric circuit when it is determined that the construction work using the working electrical equipment is completed at the construction site or the like and the work is not performed. Is to provide a work state monitoring and control device and a circuit breaker.

In order to solve the above problems, in claim 1 of the present invention,
A device usage state detecting means for detecting a usage state of a working electrical device connected to an electric circuit and outputting a signal according to the usage state of the working electrical device;
A determination means for determining whether or not the work using the work electrical equipment has been completed based on the signal output from the equipment use state detection means, and for determining that the work has been completed;
According to the present invention, there is provided a work state monitoring and control device including an output circuit that is driven based on a signal output from the determination unit and outputs an output signal to the outside.

As a result, it is possible to accurately determine that the construction work has been completed and the work has not been performed. Therefore, appropriate control can be performed based on the output signal from the output circuit, and excess energy is consumed. In addition to solving environmental problems associated with this, safety problems can also be solved.

A tripping means that operates based on a signal output from the work state monitoring and control device;
A contact opening / closing mechanism for opening and closing the electric circuit driven and operated by the tripping means and operating the operation handle;
A circuit breaker may be provided as a feature.

As a result, the tripping means is driven based on the output signal from the output circuit, so that the contact switching mechanism does not cut off the electric circuit and power is not continuously supplied to the electric circuit after the work is completed. As well as solving environmental problems associated with the consumption of energy, safety issues can also be solved.

The device usage state detecting means is a detecting means for detecting a current and a voltage flowing in the electric circuit, and a power value obtained from the detected current and the detected voltage detected by the detecting means is less than a predetermined threshold value. If so, a work state monitoring control device or a circuit breaker may be provided, which is characterized in that it is determined that the work is finished.

As a result, the current can be detected by a simple method, and the determination using the power value makes it possible to make a comparison between the detected value and the threshold without being affected by the reactive current, and by appropriately determining the threshold. , It is possible to respond to the current consumption state of the work electrical equipment that differs at various work sites, and when the work electrical equipment at the end of the work is not used by performing a comparison calculation of the threshold value and the detected power The current state can be properly grasped.

The device usage state detection means is a detection means for detecting current and voltage flowing in the electric circuit,
For the power value obtained from the detected current and the detected voltage detected by the detecting means,
Compare the current data sampled every predetermined time with time,
If the change width data as a result of the comparison is equal to or less than a predetermined threshold value, it may be determined that the work is finished, and a work state monitoring control device or a circuit breaker may be provided.

As a result, the current can be detected by a simple method, and the determination can be made based on the change in the power value. Therefore, by appropriately setting the threshold value, it is possible to detect different working electric devices at various work sites. It is possible to respond according to the current consumption state, and by comparing and calculating the amount of change in the magnitude of power that changes between the operating state and the standby state of the working electrical device, the working electrical device at the end of the work It is possible to appropriately grasp the power state when not using the.

The device usage state detection means is detection means for detecting a current flowing in the electric circuit,
For the detected current detected by the detecting means,
Based on current data sampled every predetermined time,
Parameterize the aspect of the current waveform,
Change value data as a result of comparing the parameters over time is:
A work state monitoring control device or a circuit breaker may be provided, characterized in that it is determined that the work is completed if it is equal to or less than a predetermined threshold.

As a result, regardless of the magnitude of the difference in power consumption or current consumption during use and standby of the work electrical equipment, it is always possible to accurately determine whether the work electrical equipment is in use or not. It is possible to provide a work state monitoring control device or a circuit breaker that can be obtained.

According to the present invention, the power supply to the work electrical device can be automatically stopped after the work using the work electrical device connected to the electric circuit is completed at a construction site or the like. It is possible to provide a work state monitoring and control device or a circuit breaker that can solve environmental problems caused by consumption of excess energy and safety problems.

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a work state monitoring control apparatus of the present invention. In FIG. 1, 1, 2 and 3 are electric circuits such as a single-phase three-wire system and a three-phase three-wire system. Reference numeral 4 denotes a contact device, which cuts off the electric circuit by the action of contact release means 9. An electromagnetic contactor or circuit breaker may be used as the contact device. Reference numeral 5 denotes detection means for detecting current and voltage flowing in the electric circuit and inputting a detection signal to the determination means 6. 6 is a determination means that receives the signal output from the detection means 5 and determines whether or not the work using the work electrical equipment has been completed based on a predetermined procedure. If it is determined that the work has been completed, the nine contact breaking means are driven from the eight output circuits to stop the supply of power to the electric circuit.

Next, the first determination method performed by the above-described determination means 6 will be described. The first determination method is to determine the power associated with the use of the working electrical equipment connected to the power circuit, and compare the calculated power level with a predetermined threshold value so that the power is used above the threshold value. If so, it is determined that construction work using the working electrical equipment is being performed.

This first determination method will be described with reference to FIG. In FIG. 1, reference numeral 5 denotes power detection means. The power detection means 5 includes a current detection means 51 and a voltage detection means 52, and outputs a signal based on the detection current and the detection voltage. The current detection means 51 may be configured using a current transformer or a shunt resistor. The voltage detection means 52 may be configured using a voltage sensor or the like. For single-phase two-wire system, the current of one of the two lines, for single-phase three-wire system, the power supply side two-wire, for three-phase three-wire system, the current of two lines of UVW Arrange to detect.

The determination means 6 is configured using a microcomputer. Receiving a signal based on the current detected by the detection means 5 and a signal based on the voltage, the power is obtained by calculation, and it is determined whether or not the power is less than or equal to a threshold value determined in advance by the threshold setting means 61. The timer 62 is reset.

The detected current / voltage signal fluctuates over time due to voltage fluctuations, noise, etc., in addition to the use of electrical equipment for work. For this reason, in order to more accurately determine whether or not the construction work using the work electrical equipment is being performed, the detected current / voltage signal is not subjected to the determination process for each wave, but to some extent. Are divided into one section, and the magnitude of the electric power between them is averaged to avoid misjudgment due to unnecessary fluctuations.

More specifically, an average value of power is calculated by the determination means 621 for every 10 waves of the commercial frequency, and it is determined whether or not the average value is less than or equal to a threshold value determined in advance by the threshold setting means 61. Then, the timer 62 is configured to be reset. In this embodiment, the time is obtained by dividing the common multiple of 50 Hz and 60 Hz, which are commercial frequencies, by an integer, but in addition to this, a time width capable of avoiding erroneous determination due to unnecessary fluctuations may be appropriately determined. .

The count-up time of the timer is set to about 30 minutes or 1 hour with the changeover switch. If the state where the power is below the threshold value continues for the count-up time, it is determined that the work is finished, and the output circuit of 8 is driven. The contact 9 is opened.

The threshold is set whether the power is zero or not because the dark current due to the capacitance between the circuit and the ground flows even when no load is connected, and there is a standby current due to forgetting to switch off the equipment. It is taken into consideration. It is preferable that the threshold can be switched according to the situation at the site.

As this threshold value, by using a changeover switch or the like, for example, 0.5 kW, 1 kW, 1.5 kW, 2 kW, 2.5 kW, 3 kW, etc., in increments of 0.5 kW, the power values that can be assumed at various construction sites are obtained. It is better to be able to switch settings. In addition, you may comprise using the stepless switch which can change the value of a threshold value continuously instead of a changeover switch.

In the single-phase three-wire system and the three-phase three-wire system, the outputs of the two current detection elements such as current transformers and shunt resistors, which are current detection means installed in two of the three wires, are respectively output. It may be configured so that it is determined that no work is performed when either output falls below the threshold, or when the sum of the outputs falls below the threshold It may be configured to determine that no work is performed.

Further, as a determination method, a method of comparing and calculating the magnitude of the detected current and the threshold may be used as a method other than using power. When the working electrical equipment is, for example, an AC arc welding machine often used for construction work, the standby current is about 10 A to 20 A including the reactive current, which is compared with the welding current of about 30 A to 40 A. High percentage of current during standby. For this reason, the difference in current between the standby state and the welding operation is relatively small, but it is possible to detect without calculating the electric power by adjusting the threshold so as to be appropriate according to the situation at the site.

However, as in the case of the first method, if the power is obtained and compared with the threshold value, even in the case of an AC arc welder, the standby power of the welder is about 200 W. Since the welding power is about 2 kW, the strictness of the threshold setting is relaxed, and the state of whether work is being performed or not can be determined more accurately than the strictness of the threshold.

Next, the second determination method performed by the above-described determination means 6 will be described. The second determination method is a method in which power is detected in the same manner as the first determination method described above, but the determination is made based on the variation over time of the magnitude of the detected power.

Also in this case, the configuration is basically the same as the first determination method. As shown in FIG. 1, the power detection means 5 includes a current detection means 51 and a voltage detection means 52, and outputs a signal based on the detection current and the detection voltage. The current detection means 51 may be configured using a current transformer or a shunt resistor. The voltage detection means 52 may be configured using a voltage sensor or the like.

The determination means 6 is configured using a microcomputer. By receiving a signal based on the current detected by the detection means 5 and a signal based on the voltage, the power is obtained by calculation. At that time, the current data and voltage data sampled during a predetermined time are treated as one unit data, The magnitudes of electric power required for each unit data obtained over time are compared, and the change width data (variation) of the magnitude of electric power as a result of the comparison is less than or equal to a threshold predetermined by the threshold setting means 61. If there is, work is determined not to be performed.

The detected current / voltage signal fluctuates over time due to voltage fluctuations, noise, etc., in addition to the use of electrical equipment for work. For this reason, in order to more accurately determine whether or not the construction work using the work electrical equipment is being performed, the detected current / voltage signal is not subjected to the determination process for each wave, but to some extent. Are divided into one section, and the magnitude of the electric power between them is averaged to avoid misjudgment due to unnecessary fluctuations.

More specifically, an average value of power is calculated by the determination means 6 for every 10 waves of the commercial frequency, and it is determined whether or not the average value is less than or equal to a threshold value determined in advance by the threshold setting means 61. Then, the timer 62 is configured to be reset.

The operation of the timer 62 is the same as in the first method. When the obtained change amount data of the power level falls below the threshold value, the timer 62 starts counting, and the change level of the power level is started. If the data exceeds the threshold, the timer 62 count is reset.

Further, in this embodiment, every 10 waves are averaged as one break, and the comparison calculation is performed. For example, every 1 second is divided into one break, and the comparison is performed by averaging with a larger time width. Also good.

The difference between the second determination method and the first method is that the determination means 6 in the figure compares the magnitude of the power for each unit data over time at the time of determination, The difference is that the difference in size is used as change width data, and the change width data is used as a determination material, and the change width data is compared with a preset threshold value by calculation. When the change width data exceeds the threshold value, the timer 622 is reset to count, and the change width data and the threshold value are continuously compared.

In order to correctly perform the determination by the first determination method, a preset threshold value is important. In other words, it is necessary to set an appropriate threshold value while frequently adjusting the threshold value, assuming the number and types of work electrical equipment used at the work site, the current consumption, and the standby current state. is there.

For example, in an AC arc welder frequently used at construction sites, the standby current is about 10 A to 20 A including the reactive current, and the standby current is about 30 A to 40 A compared to the current of about 30 A to 40 A during the welding operation. A large percentage. In addition, the number of welding machines used varies depending on the work site, and the standby current and welding current differ depending on the type of welder used, so the standby current is usually significantly different at each site.

Under these circumstances, when trying to detect the welding operation of one welding machine, the threshold set in advance according to the first method appropriately reflects the power required from the standby current and voltage at the site. Otherwise, it is difficult to detect whether the work using the work electrical equipment is being performed or not. However, according to the second method, the current of each unit data is not detected. Since the judgment is based on the change in magnitude, it is possible to properly judge whether work is being performed or not regardless of the standby current or the power consumption during use. This makes it possible to make an accurate determination without frequently setting the threshold value, and there is a convenience that there is no troublesome setting.

Thus, according to the second determination method, as in the first determination method, the condition for setting the threshold is relaxed, and the work using the work electrical equipment is / is not performed. Can be determined more accurately.

Next, the third determination method of the above-described determination means 6 will be described. The third determination method is a method in which a change in the state of the current waveform is detected and parameterized, and a threshold is provided for the change in the parameter. Then, when the change width of the parameter exceeds the threshold value, it is determined that the work is being performed.

The configuration is the same as in FIG. 1, but the determination unit 6 calculates a parameter value based on the output waveform of the detection unit 5 and determines whether the amount of change in the parameter value exceeds a threshold value. If the threshold is exceeded, the timer 6 is reset. The detection means 5 is composed of a current detection means 51 and outputs a signal based on the detection current. The current detection means 51 may be configured using a current transformer or a shunt resistor.

As parameter values, phase, waveform rate (= effective value / average value), crest factor (= maximum value / effective value), maximum value / average value, order component amount by Fourier series expansion, etc. may be used.

FIG. 2 shows an example of the current waveform of the standby current and welding current of the AC arc welding machine, taking the above-mentioned AC arc welding machine as an example of the working electrical equipment. As shown in Fig. 2, it can be seen that there are differences in the waveform rate, crest factor, and maximum / average value during standby and during welding. These differences are the difference between the standby current and welding current in Fig. 2. Is expanded into a Fourier series, so that component amounts of different orders are calculated for each waveform.

Therefore, the component amount of a specific order, the component ratio of the component amount for each order, and the like can be used as parameters. Since the component amount other than the fundamental wave component is the distortion amount, the distortion rate can be used as a parameter.

The first to third methods described above can be used alone or in combination as a determination method.

Next, the circuit breaker of the present invention will be described with reference to FIG.

In FIG. 3, the external view of the circuit breaker of this invention is shown. Whether the circuit breaker in this embodiment is connected to an electric circuit or not, and is a working block used to calculate the working current and power in the electric circuit and a breaker block having a function of interrupting the electric circuit if necessary. If it is determined whether or not it is determined that the working electrical equipment is being used, a signal is sent to the interruption block, and the determination block that triggers the interruption of the electric circuit is connected by a connecting means. It is.

The blocking block 110 acts on the current detecting means for detecting the current flowing in the electric circuit, the voltage detecting means for detecting the voltage of the electric circuit, the contact opening / closing mechanism section for turning on / off the electric circuit, and the contact opening / closing mechanism section to open the contact. And tripping means for bringing it into a state.

As the current detection means, a current transformer provided through the electric circuit is used. As the voltage detection means, a voltage sensor using a general resistor is used. Further, in the present embodiment, the current detection means is provided in the U phase and the W phase in the electric circuit in the figure, and detects the magnitude of the consumption current generated by performing work using the work electrical equipment. . In the case of a single-phase three-wire system, a current transformer may be provided for each voltage line. In addition to this, the current detecting means may be configured using a shunt resistor, a Hall element, or the like.

The tripping means is configured by using a trip coil having an iron core that acts on the opening / closing mechanism. When a current flows through the trip coil, the iron core is drawn into the coil by electromagnetic force, and the latch provided in the opening / closing mechanism is tripped to open the contact. The tripping means may be configured using a piezoelectric element or an actuator that performs mechanical displacement by supplying energy. As a base of the interruption block 110, a current detection means may be appropriately incorporated and configured using a circuit breaker provided with a tripping means.

Reference numeral 120 denotes a determination block that is used by being connected to the blocking block 100 by a connecting means constituted by a mechanical engagement portion or the like.

Whether the determination block 120 is performing work using the working electrical equipment supplied with power from the electric circuit based on the signals output from the current detection means and voltage detection means provided in the circuit breaker block 110. A determination means for outputting a signal when it is determined that no work is being performed, and a trip driving means for driving the trip means based on the signal output from the determination means. I have.

In this embodiment, the determination means is configured by using a microcomputer having an I / O port, a program data storage area, an arithmetic processing unit, etc., and the trip output means is triggered by a signal output from the microcomputer. The thyristor is driven and configured as a part of the power supply path of the tripping means. The trip driving means may be configured using other relays or semiconductor switches.

The determination block 120 includes a power acquisition unit that is connected to an electric circuit provided in the blocking block 110 to acquire power, a current / voltage detection signal acquisition unit that acquires a signal output from the current detection unit, and a trip unit. A tripping means drive path connection section for driving the power supply and the signal transmission / reception to / from the blocking block is provided.

In this embodiment, holes for arranging lead wires constituting the power source acquisition unit, the current / voltage detection signal acquisition unit, and the trip means driving path connection unit are formed in a part of the body constituting the outline of the blocking block. A section is provided and drawn into the decision block.

The power acquired from the power acquisition unit is full-wave rectified in the determination block, stepped down to a voltage suitable for driving the microcomputer, and supplied to the microcomputer.

The signal output from the current detection means acquired from the current / voltage detection signal acquisition unit is amplified by a voltage amplification circuit as input preprocessing before being input to the microcomputer, and unnecessary noise is removed by a low-pass filter. The signal level adjustment circuit adjusts the input level suitable for the input port of the microcomputer and inputs it to the microcomputer. In this embodiment, a plurality of current / voltage detection means are provided, and the number of input preprocessing systems is provided.

The signal input to the microcomputer is determined by the determination program stored in the microcomputer to determine whether the work is being performed. If it is determined that the work is not being performed, the signal is sent to the trip driving means. A drive signal is output. When the trip signal is output in response to the drive signal, a voltage is applied to the trip means, and the trip means operates to open the contacts of the contact switching mechanism. As a result, the supply of power to the electric circuit is stopped.

The blocking block 110 and the determination block 120 are configured to be connected by a connecting means. In order to use various circuit breakers for the general purpose as the connecting means, a sheet coated with an adhesive is used. In addition, a mechanical hooking portion may be provided in each of the blocking block 110 and the determination block 120 so as to be engaged with each other.

In the determination block 120, reference numeral 123 denotes threshold setting means, which is configured using a changeover switch that can be set from 5A to 30A in increments of 5A. Also, the function OFF can be selected so that the function of the determination operation itself can be turned OFF.

Reference numeral 124 denotes timer setting means for setting a timer time, which can select either 30 minutes or 1 hour.

Reference numeral 125 denotes a power lamp, which is configured using LEDs. The power lamp is electrically connected to the output port of the microcomputer 121 and is lit when the determination block is functioning.

Note that the method of turning on the power lamp may be changed according to the determination status of the determination unit. For example, the lighting may be normally performed, but the determination process may be performed based on the detected current, and when the timer operation starts, it may blink to notify that the power supply will be shut off soon. By letting the surroundings know that energization of the electric circuit is stopped after a predetermined time in advance, it is possible to reduce confusion at the site as compared with the case of sudden power failure.

126 is a test button. When the test button 126 is operated, the microcomputer 121 performs a self-check to check whether the functions of both the determination block and the blocking block are normal.

In this embodiment, when the test button 126 is operated, the shutoff signal of the microcomputer 121 is output after 5 seconds. Since the trip driving means receives the shut-off signal and the anode-cathode becomes conductive, power is applied to the trip means provided in the shut-off block. Then, the tripping means is driven and acts on the contact opening / closing mechanism to open the contact.

Reference numeral 114 denotes a cut-off display button. The shut-off display button 114 is configured to protrude from the casing that forms the outline of the shut-off block when the shut-off operation is performed according to the judgment of the judgment block. Specifically, when the iron core provided in the tripping means 113 is operated, it is configured to project / retract in conjunction with the movement of the iron core.

As a result, when the operation handle of the blocking block 110 is in the OFF position, it is determined whether or not the blocking operation has been performed by determining that the work is not being performed by checking the protruding state of the blocking display button 114 to determine whether the operation is being performed. Judgment can be made.

As described above, the circuit breaker shown in FIG. 3 can be used by modifying the circuit breaker with a tripping means and the earth leakage circuit breaker. Compared to the development of a circuit breaker that can determine whether or not work electrical equipment is used and break the circuit, the development period of the circuit breaker can be shortened. There is an advantage that the manufacturing cost can be reduced.

In this embodiment, the interruption block 110 having the function of the work state monitoring control device is connected to the determination block 120. However, as shown in FIG. 4, the determination block is provided inside the circuit breaker. The function of 120 may be incorporated and configured as a dedicated circuit breaker. As a result, the space of the judgment block portion is saved, and the space can be reduced when installing on a temporary distribution board.

In the present embodiment, an example is shown in which a microcomputer is used to compare and determine the detected current and a predetermined threshold value, and to output to the trip driving means. A capacitor is used to compare the output value obtained from the current detection means with the threshold setting value in an analog manner, and when the threshold setting value becomes large, a circuit for driving the trip driving means is configured. May be. Thus, an inexpensive analog circuit can be used without using an expensive microcomputer.

The present invention can be used for a temporary distribution board used at a construction site or the like. In addition, since it is possible to prevent forgetting to turn off electricity, it can be used for household purposes, factories and other business purposes as much as possible for the same purpose.

The block diagram which shows the working condition monitoring control apparatus and circuit breaker of 1st Example The figure which showed the electric current waveform of the electric equipment for work. The external view of the circuit breaker of this invention. The external view which shows the example of another circuit breaker.

Explanation of symbols

1, 2, 3 Electric circuit 100 Circuit breaker 110 Blocking block 114 Blocking display button 120 Determination block 123 Threshold setting unit 124 Timer setting unit 125 Power lamp 126 Test button 4 Contact device 5 Detection unit 6 Determination unit 8 Output circuit 9 Contact opening means

Claims (5)

A device usage state detecting means for detecting a usage state of a working electrical device connected to an electric circuit and outputting a signal according to the usage state of the working electrical device;
A determination means for determining whether or not the work using the work electrical equipment has been completed based on the signal output from the equipment use state detection means, and for determining that the work has been completed;
An operation state monitoring and control apparatus comprising: an output circuit that is driven based on a signal output from the determination means and outputs an output signal to the outside.
Tripping means that operates based on a signal output from the work state monitoring control device;
A contact opening / closing mechanism for opening and closing the electric circuit driven and operated by the tripping means and opening and closing the electric circuit by operating the operation handle;
A circuit breaker comprising:
The device usage state detecting means is a detecting means for detecting a current and a voltage flowing in an electric circuit,
2. The work state monitoring and control apparatus according to claim 1, wherein if the power value obtained from the detected current and the detected voltage detected by the detecting means is equal to or less than a predetermined threshold value, it is determined that the work is finished. Or the circuit breaker of Claim 2.
The device usage state detecting means is a detecting means for detecting a current and a voltage flowing in an electric circuit,
For the power value obtained from the detected current and the detected voltage detected by the detecting means,
Compare the current data sampled every predetermined time with time,
3. The work state monitoring and control device according to claim 1, or the circuit breaker according to claim 2, wherein if the change width data as a result of the comparison is equal to or less than a predetermined threshold value, it is determined that the work is finished.
The device usage state detecting means is a detecting means for detecting a current flowing in the electric circuit,
For the detected current detected by the detecting means,
Based on current data sampled every predetermined time,
Parameterize the aspect of the current waveform,
Change value data as a result of comparing the parameters over time is:
3. The work state monitoring control device according to claim 1, or the circuit breaker according to claim 2, wherein the work is judged to have been completed if it is equal to or less than a predetermined threshold value.

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