CN112098826A - System, equipment and method for batch detection of quality of residual current circuit breakers - Google Patents
System, equipment and method for batch detection of quality of residual current circuit breakers Download PDFInfo
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- CN112098826A CN112098826A CN202010909518.2A CN202010909518A CN112098826A CN 112098826 A CN112098826 A CN 112098826A CN 202010909518 A CN202010909518 A CN 202010909518A CN 112098826 A CN112098826 A CN 112098826A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
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Abstract
The invention relates to a mass detection system, equipment and method for residual current circuit breakers. A mass detection system for the quality of residual current circuit breakers comprises a control module, a zero sequence power supply and a plurality of detection modules; each detection module comprises a phase sequence power supply and a switch state detection unit; the phase sequence power supply is connected with a three-phase wire inlet end of the circuit breaker, and the switch state detection unit is connected with a three-phase wire outlet end of the circuit breaker; a plurality of circuit breakers to be detected are connected in series through respective zero sequence circuits and then are connected with the output end of the zero sequence power supply; the control module is respectively connected with the circuit breaker, the phase sequence power supply, the switch state detection unit and the zero sequence power supply. The batch detection system provided by the invention realizes the simultaneous detection of a plurality of circuit breakers under the condition of ensuring that a zero sequence power supply is not added, improves the detection efficiency, and is quick and convenient.
Description
Technical Field
The invention relates to electronic product detection, in particular to a system, equipment and method for detecting the quality of residual current circuit breakers in batches.
Background
Residual current circuit breaker is in low voltage distribution application and extensive, and its output is huge, and traditional residual current circuit breaker's production inspection can only detect alone, if will realize that batch detection needs increase detection source quantity, perhaps switches production in proper order, causes the problem that production detection device investment is huge, detection efficiency is low.
The existing residual current circuit breaker provides three-phase voltage signals for the circuit breaker through a driving power supply, and the circuit breaker is used for enabling the circuit breaker to normally work. A constant current source is used for simulating a residual current signal to check the residual current protection function of the circuit breaker. According to the detection method, if a plurality of circuit breakers need to be detected simultaneously, a driving power supply and a constant current source need to be configured for detection of each circuit breaker. And thus the apparatus cost thereof is high. If a single detection mode is adopted, the production time is too long, and the efficiency is too low.
Patent document No. cn201510723954.x discloses an extra-high voltage direct current transmission simulation system, which is used for performing simulation analysis on an extra-high voltage direct current transmission system, fully utilizing various real-time simulation resources of a current simulation center, selecting an alternating current/direct current system model ratio to perform system modeling, establishing an extra-high voltage direct current transmission control system and a control mode, analyzing transmission limit capacity, simulating extra-high voltage direct current transmission, simulating a converter valve and control protection of the direct current system in detail, and correctly reflecting the operation condition of the direct current system. But fails to effectively solve the above problems.
Therefore, the existing circuit breaker inspection technology has defects and needs to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a system, a device and a method for mass detection of residual current circuit breakers, so as to solve the technical problems mentioned in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mass detection system for the quality of residual current circuit breakers comprises a control module, a zero sequence power supply and a plurality of detection modules;
each detection module comprises a phase sequence power supply and a switch state detection unit; the phase sequence power supply is connected with a three-phase wire inlet end of the circuit breaker, and the switch state detection unit is connected with a three-phase wire outlet end of the circuit breaker;
a plurality of circuit breakers to be detected are connected in series through respective zero sequence circuits and then are connected with the output end of the zero sequence power supply;
the control module is respectively connected with the circuit breaker, the phase sequence power supply, the switch state detection unit and the zero sequence power supply.
Preferably, the mass of residual current circuit breaker is detecting system in batches, control module with communication connection between the circuit breaker for realize:
sending a driving instruction to a plurality of circuit breakers, and collecting the running state of each circuit breaker;
and acquiring the opening and closing state of the circuit breaker, and determining whether the circuit breaker is qualified or not by matching with the running state.
Preferably, in the system for detecting the mass of the residual current circuit breakers in batches, the zero sequence power supply generates a simulated residual current signal, and the simulated residual current signal is input into the plurality of circuit breakers connected in series to realize that:
controlling residual current signals input to the plurality of circuit breakers, and determining the running state of the circuit breakers according to the flowing residual current value; the operation state at least comprises opening and closing information and residual current information;
the operating state of each circuit breaker is obtained through the switch state detection unit, and whether the circuit breaker is qualified or not is determined.
Preferably, the system for detecting the quality of the residual current circuit breakers in batches is characterized in that the phase sequence power supply outputs commercial power to the outside and simulates the normal power distribution working environment of the circuit breakers.
Preferably, in the mass batch detection system for the current breakers, the zero-sequence power supply is used for driving and outputting a zero-sequence current according to the control module.
The circuit breaker batch detection equipment using the detection system comprises a processor, a constant current source and a plurality of detection devices;
the detection device comprises a driving power supply, a switch detection device and a detection position; the detection position is provided with a phase sequence inlet joint, a phase sequence outlet joint, a zero sequence inlet joint, a zero sequence outlet joint and a communication joint and is used for installing a circuit breaker to be detected; the driving power supply is connected with the phase sequence inlet joint, the switch detection device is connected with the phase sequence outlet joint, and the processor is connected with the communication joint; the detection positions are sequentially connected in series through the zero sequence inlet joint and the zero sequence outlet joint and then connected with the output end of the constant current source;
the driving power supply, the switch detection device and the constant current source are respectively connected with the processor.
Preferably, circuit breaker batch check out test set, will wait to detect the circuit breaker and install in detecting the position, each joint in detecting the position corresponds the butt joint with the circuit breaker respectively for realize:
and sending a driving instruction to the plurality of to-be-detected circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers.
Preferably, the batch detection device for circuit breakers, the constant current source simulates to generate a zero sequence current, and the zero sequence current is input into the circuit breakers to be detected which are connected in series, so as to realize that:
the control is input to a plurality of residual currents of waiting to detect the circuit breaker, detects the divide-shut brake state of waiting to detect the circuit breaker through each, confirms whether qualified the circuit breaker.
Preferably, the serial connection mode between the detection positions of the batch detection equipment for the circuit breakers is dynamic serial connection, and the specific serial connection number is determined by the number of the circuit breakers to be detected.
A circuit breaker detection method of the detection system comprises the following steps:
sending a driving instruction to a plurality of circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers;
controlling residual current signals input to the plurality of circuit breakers, and comparing residual current measurement data of each circuit breaker with a residual current value generated by an actual zero-sequence power supply to determine whether the circuit breaker is qualified or not;
the residual current signals input to the plurality of circuit breakers are controlled, and whether the circuit breakers are qualified or not is determined by detecting the protection action execution condition of each circuit breaker under the condition that the residual current protection function of the circuit breakers is started.
Compared with the prior art, the system, the device and the method for detecting the quality of the residual current circuit breakers in batches have the following beneficial effects:
1) the batch detection system provided by the invention realizes the simultaneous detection of a plurality of circuit breakers under the condition of ensuring that a zero sequence power supply is not added, improves the detection efficiency, and is quick and convenient;
2) the batch detection equipment provided by the invention has low manufacturing cost, realizes the simultaneous detection of a plurality of circuit breakers, reduces the production period and improves the production efficiency.
Drawings
FIG. 1 is a block diagram of a batch inspection system provided by the present invention;
FIG. 2 is a block diagram of a batch test apparatus according to the present invention;
FIG. 3 is a flow chart of a batch inspection method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1 and fig. 3 together, the invention provides a mass detection system for residual current circuit breakers, which includes a control module 1, a zero sequence power supply 2 and a plurality of detection modules 3; the phase sequence power supply is preferably an isolated power supply.
Each of the detection modules 3 includes a phase-sequence power supply 31 and a switch state detection unit 32; the phase sequence power supply 31 is connected with a three-phase incoming line end of the circuit breaker, and the switch state detection unit 32 is connected with a three-phase outgoing line end of the circuit breaker; preferably, the switch state detection unit 32 determines the switching-on/off state of the circuit breaker by determining whether the phase sequence outlet terminal of the circuit breaker is electrified.
A plurality of circuit breakers to be detected are connected in series through respective zero sequence lines and then are connected with the output end of the zero sequence power supply 2; at this moment, a plurality of circuit breakers are connected in series through the zero sequence circuit, and in the normal detection process, the zero sequence currents received by the circuit breakers are the same.
The control module 1 is connected to the circuit breaker, the phase-sequence power supply 31, the switch state detection unit 32, and the zero-sequence power supply 2, respectively. The phase sequence power supply 31 is driven by the control module 1, provides a power supply for the circuit breaker, is used for simulating a power distribution working environment of a normal circuit breaker, and simultaneously performs communication interaction with the circuit breaker to perform remote control on the circuit breaker and receive operation information (including switching-on and switching-off log information and the like) of the circuit breaker; the switch state detection unit 32 is configured to detect whether a voltage signal exists at a three-phase line outgoing end of the circuit breaker, and send a determination result to the control module 1, specifically, the determination result is connected to a phase line outgoing end of the circuit breaker, where the determination result needs to include a voltage signal determination condition of the phase line outgoing end; the zero-sequence power supply 2 is configured to simulate a zero-sequence current state of a normal distribution line according to the control module 1, and can output zero-sequence currents in different states, such as a fault state zero-sequence current and a normal state zero-sequence current.
As a preferable scheme, in this embodiment, the control module 1 is in communication connection with the circuit breaker, so as to implement:
sending a driving instruction to a plurality of circuit breakers, and collecting the running state of each circuit breaker;
and acquiring the opening and closing state of the circuit breaker, and determining whether the circuit breaker is qualified or not by matching with the running state.
As a preferred scheme, in this embodiment, the zero sequence power supply 2 generates an analog residual current signal, and inputs the analog residual current signal into a plurality of circuit breakers connected in series, so as to implement:
controlling residual current signals input to the plurality of circuit breakers, and determining the running state of the circuit breakers according to the flowing residual current value; the operation state at least comprises opening and closing information and residual current information;
the operating state of each circuit breaker is obtained by the switch state detection unit 32, and whether the circuit breaker is qualified or not is determined.
Specifically, the working principle of the circuit breaker quality batch detection system is as follows:
connecting a plurality of circuit breakers according to the system mode;
and (3) detecting the remote control opening and closing function: a1, the control module 1 drives the phase-sequence power supply 31 to provide power for the circuit breaker according to the normal working power utilization environment; a2, the control module 1 sends switching-on and switching-off information (the switching-off information can be all phase line contacts of the circuit breaker, or can be part of the phase line contacts, depending on whether the circuit breaker has corresponding functions) to the circuit breaker, and receives the judgment result of the switch state detection unit 32; a3, judging whether the remote control function of the breaker is normal.
Detecting the residual current protection fault function of the circuit breaker: the control module 1 drives the phase-sequence power supply 31 to provide power and the zero-sequence power supply 2 to simulate the residual current of the distribution line; b2, the control module 1 sends an instruction to the circuit breaker and reads the current fault information of the circuit breaker. b3, the control module 1 receives the judgment result of the switch state detection unit 32, and judges whether the fault detection function of the circuit breaker is normal.
Monitoring the residual current measuring function of the circuit breaker: c1, the control module 1 drives the phase-sequence power supply 31 to provide power and the zero-sequence power supply 2 to simulate the residual current of the distribution line; c2, the control module 1 sends an instruction to the circuit breaker and reads the residual current measurement information of the current circuit breaker; c3, the control module 1 judges whether the residual current measuring function of the circuit breaker is normal by comparing the simulated residual current value generated in the zero line power supply with the residual current measuring value read by the circuit breaker.
Of course, it should be noted that the present invention is not limited to a specific method for determining whether or not to be normally used, and an existing determination method may be used.
As a preferable scheme, in this embodiment, the phase sequence power supply 31 outputs commercial power to the outside, so as to simulate a normal power distribution working environment of the circuit breaker.
Preferably, in this embodiment, the phase-sequence power source 31 is connected to the zero-sequence power source 2. The phase-sequence power supply 31 and the zero-sequence power supply 2 can be better matched for use.
Correspondingly, referring to fig. 3, the present invention further provides a circuit breaker detection method for the detection system, including the steps of:
sending a driving instruction to a plurality of circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers;
controlling residual current signals input into the plurality of circuit breakers, and comparing residual current measurement data of each circuit breaker with a residual current value generated by the actual zero-sequence power supply 2 to determine whether the circuit breaker is qualified or not;
the residual current signals input to the plurality of circuit breakers are controlled, and whether the circuit breakers are qualified or not is determined by detecting the protective action execution condition of each circuit breaker under the condition that the residual current protection function of the circuit breakers is started, namely the process of converting from a closing state to an opening state.
Example 2
Referring to fig. 2 and 3, the invention also provides a circuit breaker batch detection device using the detection system, which comprises a processor 4, a constant current source 5 and a plurality of detection devices 6;
the detection device 6 comprises a driving power supply 61, a switch detection device 62 and a detection position 63; the detection position 63 is provided with a phase sequence inlet joint, a phase sequence outlet joint, a zero sequence inlet joint, a zero sequence outlet joint and a communication joint and is used for installing a circuit breaker to be detected; the driving power supply 61 is connected with the phase sequence inlet joint, the switch detection device 62 is connected with the phase sequence outlet joint, and the processor 4 is connected with the communication joint; the detection positions 63 are sequentially connected in series through the zero sequence inlet joint and the zero sequence outlet joint and then connected with the output end of the constant current source 5;
the driving power source 61, the switch detection device 62, and the constant current source 5 are connected to the processor 4, respectively.
Specifically, the system access, function and execution modes between the processor 4 and the control module 1, between the constant current source 5 and the zero sequence power supply 2, between the driving power supply 61 and the phase sequence power supply 31, and between the switch detection device 62 and the switch state detection unit 32 in embodiment 1 are the same, and are not described herein again. The detection position 63 is used for installing a circuit breaker to be detected, it should be noted that the detection position 63 may be an independent device, or a position for detection may be provided on the detection equipment provided by the present invention, the simplest detection position 63 is a set of all functional connectors, and is conveniently connected to the circuit breaker, all the wires required for detection in the detection equipment are connected to the corresponding connectors, and when detection is required, each connection end of the circuit breaker is connected to the corresponding connector of the detection position 63.
Specifically, before beginning to detect, install a plurality of circuit breakers that wait according to the above-mentioned requirement on check out test set's detection position 63, treater 4 control drive power supply 61 provides power supply for the circuit breaker, and drive constant current source 5 produces simulation residual current signal simultaneously, through receiving switch detection device 62's information identification circuit breaker's divide-shut brake state, communicates with the circuit breaker simultaneously, gathers circuit breaker trip information. And the simultaneous batch production detection is realized.
Specifically, when the method is implemented on site, the driving power supply 61 is an isolation power supply and is connected to a phase voltage inlet end of the circuit breaker. The switch detection device 62 is connected to a phase voltage outlet end of the circuit breaker, and the constant current source 5 is sequentially connected with a zero sequence current input and output end of the circuit breaker. The processor 4 is connected with the circuit breaker through a communication line to realize data communication.
A, B, C phase (phase voltage circuit) poles of the tested circuit breaker are independent, and N poles (zero sequence current circuit) are sequentially connected in series, namely the outlet end of the tested No. 1 circuit breaker is connected with the inlet end of the No. 2 circuit breaker. The output 1 end of the constant current source 5 is connected with the N-pole wire inlet end of the No. 1 circuit breaker, and is connected to the output 2 end of the constant current source 5 from the N-pole wire outlet end of the No. N circuit breaker after being connected with the circuit breakers in series.
After the circuit breakers to be tested in batches are placed into the detection equipment, all the circuit breakers are placed in a closing state. The processor 4 controls the driving power source 61 to be powered on, so that the tested circuit breaker starts to work normally. Meanwhile, the opening and closing state of the current circuit breaker to be tested is judged by inquiring the switch detection device 62. And the communication line is communicated with the tested circuit breaker to confirm the operating state of the circuit breaker.
And when the control module 1 confirms that the circuit breaker works normally, starting the constant current source 5 to output the simulated zero sequence current so as to simulate the residual current for testing.
And when the tested circuit breaker detects that the current is greater than the preset residual current protection action threshold value, executing a tripping action, wherein the A, B, C phase contact is switched to be opened from a closed jump. The corresponding switch detection device 62 detects a switch trip. After receiving the displacement signal of the switch detection device 62, the processor 4 records the current output current value of the constant current source 5, and reads the data of the corresponding circuit breaker executing the protection action through communication, so as to confirm whether the event of generating the residual current protection action occurs. And finally, whether the residual current protection function of the circuit breaker is normal or not is confirmed through comparing data.
Generally, the circuit breaker is measured to be a 3P + N (A, B, C, N mode) structure, in which A, B, C phases have a breaking function, and N is a straight-through. Therefore, when the circuit breaker is in trip protection, the A, B, C phase pole can be converted from a closed state to an open state, and the N pole is still in a through state.
The current outputs of the constant current source 5 are thus connected in sequence from the N-pole inlet and outlet lines of the circuit breaker under test. Because N is the direct structure, therefore even a certain tested circuit breaker triggers protection action to execute tripping operation during batch detection, the current output of the cross current source cannot be influenced, and still can normally output analog leakage current, and the residual current detection of other circuit breakers cannot be influenced.
As a preferable scheme, in this embodiment, the circuit breaker to be detected is installed in the detection position 63, and each connector in the detection position 63 is correspondingly butted with the circuit breaker, so as to implement:
and sending a driving instruction to the plurality of to-be-detected circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers.
As a preferable scheme, in this embodiment, the constant current source 5 generates a zero sequence current in a simulation manner, and inputs the zero sequence current to the circuit breaker to be detected, which is connected in series, so as to implement:
the control is input to a plurality of residual currents of waiting to detect the circuit breaker, detects the divide-shut brake state of waiting to detect the circuit breaker through each, confirms whether qualified the circuit breaker.
Preferably, in this embodiment, the serial connection mode between the detection positions 63 is dynamic serial connection, and the specific serial number is determined by the number of the circuit breakers to be detected. The dynamic series connection means that the number of the detection positions 63 can be adjusted according to the number of the circuit breakers to be detected when the circuit breakers are used specifically, and the adjustment mode is common knowledge in the field.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A mass detection system for the quality of residual current circuit breakers is characterized by comprising a control module, a zero sequence power supply and a plurality of detection modules;
each detection module comprises a phase sequence power supply and a switch state detection unit; the phase sequence power supply is connected with a three-phase wire inlet end of the circuit breaker, and the switch state detection unit is connected with a three-phase wire outlet end of the circuit breaker;
a plurality of circuit breakers to be detected are connected in series through respective zero sequence circuits and then are connected with the output end of the zero sequence power supply;
the control module is respectively connected with the circuit breaker, the phase sequence power supply, the switch state detection unit and the zero sequence power supply.
2. The mass detection system for residual current circuit breakers according to claim 1, characterized in that said control module is communicatively connected to said circuit breakers for implementing:
sending a driving instruction to a plurality of circuit breakers, and collecting the running state of each circuit breaker;
and acquiring the opening and closing state of the circuit breaker, and determining whether the circuit breaker is qualified or not by matching with the running state.
3. The mass batch detection system for the residual current circuit breakers according to claim 1, wherein the zero sequence power supply generates an analog residual current signal, which is input to a plurality of circuit breakers connected in series, so as to realize:
controlling residual current signals input to the plurality of circuit breakers, and determining the running state of the circuit breakers according to the flowing residual current value; the operation state at least comprises opening and closing information and residual current information;
the operating state of each circuit breaker is obtained through the switch state detection unit, and whether the circuit breaker is qualified or not is determined.
4. The mass detection system for the residual current circuit breakers according to claim 1, wherein the phase sequence power supply outputs commercial power to the outside to simulate the normal power distribution working environment of the circuit breakers.
5. The mass batch detection system for current breakers according to claim 1, wherein the zero sequence power supply is configured to output a zero sequence current according to a control module drive.
6. A circuit breaker batch test apparatus using the test system of any one of claims 1 to 5, comprising a processor, a constant current source and a plurality of test devices;
the detection device comprises a driving power supply, a switch detection device and a detection position; the detection position is provided with a phase sequence inlet joint, a phase sequence outlet joint, a zero sequence inlet joint, a zero sequence outlet joint and a communication joint and is used for installing a circuit breaker to be detected; the driving power supply is connected with the phase sequence inlet joint, the switch detection device is connected with the phase sequence outlet joint, and the processor is connected with the communication joint; the detection positions are sequentially connected in series through the zero sequence inlet joint and the zero sequence outlet joint and then connected with the output end of the constant current source;
the driving power supply, the switch detection device and the constant current source are respectively connected with the processor.
7. The batch detection equipment for circuit breakers according to claim 6, wherein the circuit breakers to be detected are installed in the detection positions, and each joint in the detection positions is correspondingly butted with the circuit breakers respectively to realize that:
and sending a driving instruction to the plurality of to-be-detected circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers.
8. The batch testing equipment of circuit breakers according to claim 7, wherein the constant current source simulates to generate a zero sequence current, which is input to the series-connected circuit breakers to be tested to realize:
the control is input to a plurality of residual currents of waiting to detect the circuit breaker, detects the divide-shut brake state of waiting to detect the circuit breaker through each, confirms whether qualified the circuit breaker.
9. The batch testing equipment of circuit breakers of claim 6, wherein the serial connection mode between the testing positions is dynamic serial connection, and the specific serial number is determined by the number of the circuit breakers to be tested.
10. A circuit breaker detection method to be applied to the detection system according to any one of claims 1 to 5, comprising the steps of:
sending a driving instruction to a plurality of circuit breakers, and determining whether the circuit breakers are qualified or not by detecting the opening and closing states of the circuit breakers;
controlling residual current signals input to the plurality of circuit breakers, and comparing residual current measurement data of each circuit breaker with a residual current value generated by an actual zero-sequence power supply to determine whether the circuit breaker is qualified or not;
the residual current signals input to the plurality of circuit breakers are controlled, and whether the circuit breakers are qualified or not is determined by detecting the protection action execution condition of each circuit breaker under the condition that the residual current protection function of the circuit breakers is started.
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| CN202010909518.2A CN112098826A (en) | 2020-09-02 | 2020-09-02 | System, equipment and method for batch detection of quality of residual current circuit breakers |
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| CN202010909518.2A CN112098826A (en) | 2020-09-02 | 2020-09-02 | System, equipment and method for batch detection of quality of residual current circuit breakers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848473A (en) * | 2021-10-22 | 2021-12-28 | 国网山东省电力公司商河县供电公司 | Residual current operated protective device verifying attachment |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848473A (en) * | 2021-10-22 | 2021-12-28 | 国网山东省电力公司商河县供电公司 | Residual current operated protective device verifying attachment |
| CN113848473B (en) * | 2021-10-22 | 2024-03-15 | 国网山东省电力公司商河县供电公司 | Residual current operated protector verifying attachment |
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