CN112505535A - Circuit breaker opening and closing characteristic testing method and system - Google Patents
Circuit breaker opening and closing characteristic testing method and system Download PDFInfo
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- CN112505535A CN112505535A CN202011245782.7A CN202011245782A CN112505535A CN 112505535 A CN112505535 A CN 112505535A CN 202011245782 A CN202011245782 A CN 202011245782A CN 112505535 A CN112505535 A CN 112505535A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention discloses a method and a system for testing the opening and closing characteristics of a circuit breaker, wherein the method comprises the following steps: acquiring an electric signal to be tested at the side of a power grid where a breaker is located; amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal, and generating a switch driving signal; and identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal. In the embodiment of the invention, the automatic identification of the opening and closing characteristics of the circuit breaker can be realized by utilizing the electric signal to be tested on the power grid side where the circuit breaker is positioned, the field workload of substation operators can be reduced, and the overhauling working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of testing of primary power transformation equipment, in particular to a method and a system for testing opening and closing characteristics of a circuit breaker.
Background
In recent years, the power grid has higher load, and the requirement of users on the operation reliability of the power grid is higher, so that stricter requirements are made on power equipment. A circuit breaker, one of the most important power devices in a power system, plays a role of controlling a load current in accordance with a normal state, and also plays a role of protecting an abnormal current from being carried, turned on or off for a predetermined time. The mechanical characteristic test of the circuit breaker is a specified item for periodic maintenance of the circuit breaker, but the following problems exist at present: when the traditional circuit breaker characteristic tester measures the mechanical characteristics such as switching-on and switching-off time, synchronization, speed and the like of the circuit breaker, grounding disconnecting switches on two sides of the circuit breaker need to be disconnected, and therefore scheduling personnel permission and field operation of transformer substation operating personnel are needed, large workload is brought to the operating personnel and the scheduling personnel, and large invalid maintenance waiting time is also brought to maintenance work.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method and a system for testing the opening and closing characteristics of a circuit breaker.
In order to solve the problems, the invention provides a method for testing the opening and closing characteristics of a circuit breaker, which comprises the following steps:
acquiring an electric signal to be tested at the side of a power grid where a breaker is located;
amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal, and generating a switch driving signal;
and identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
Optionally, the acquiring the electrical signal to be tested at the power grid side where the circuit breaker is located includes:
collecting an induced electric signal at the switch side of the circuit breaker by using a Hall current sensor; or the like, or, alternatively,
and testing loop resistance values at two ends of the circuit breaker based on the direct-current double-arm bridge, and converting the loop resistance values obtained by testing into electric signals to be tested for output.
Optionally, the amplifying the electrical signal to be tested includes:
and based on the level state of the electric signal to be tested, performing voltage amplification on the electric signal to be tested by using a signal amplifier to generate a final voltage comparison signal.
Optionally, the comparing the processed electric signal to be tested based on the set reference signal, and generating the switch driving signal includes:
and acquiring the level state of the voltage comparison signal, calling a signal comparator with a reference signal matched with the level state of the voltage comparison signal to compare and output the voltage comparison signal, and generating a switch driving signal.
Optionally, the identifying and recording the switching-on and switching-off state and the switching-on and switching-off time of the circuit breaker according to the state of the switch driving signal includes:
and performing closing response on the switch driving signal by using a switch triode, recording closing time of the switch triode based on a mechanical characteristic tester, and generating state information of the closed state of the circuit breaker.
In addition, the embodiment of the invention also provides a circuit breaker opening and closing characteristic testing system, which comprises:
the acquisition module is used for acquiring an electric signal to be tested at the power grid side where the circuit breaker is located;
the processing module is used for amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal and generating a switch driving signal;
and the identification module is used for identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
Optionally, the acquisition module is configured to acquire an induced electrical signal at a switch side of the circuit breaker by using a hall current sensor; or the loop resistance values at the two ends of the circuit breaker are tested based on the direct-current double-arm bridge, and the loop resistance values obtained through testing are converted into electric signals to be tested to be output.
Optionally, the processing module is configured to perform voltage amplification on the electrical signal to be tested by using a signal amplifier based on the level state of the electrical signal to be tested, so as to generate a final voltage comparison signal.
Optionally, the processing module is further configured to obtain a level state of the voltage comparison signal, and call a signal comparator with a reference signal adapted to the level state of the voltage comparison signal to compare and output the voltage comparison signal, so as to generate a switch driving signal.
Optionally, the identification module is configured to perform a closing response on the switch driving signal by using a switch triode, record closing time of the switch triode based on a mechanical characteristic tester, and generate state information that the circuit breaker has been closed.
In the embodiment of the invention, the automatic identification of the opening and closing characteristics of the circuit breaker can be realized by analyzing and processing the electric signals to be tested on the power grid side where the circuit breaker is positioned, the grounding disconnecting switches on two sides of the circuit breaker are not required to be disconnected on site by substation operators, a mechanical characteristic tester is favorable for being connected to continuously execute a mechanical characteristic test at a proper time, the site workload of the substation operators can be reduced, the overhauling working efficiency is improved, and the working cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an internal circuit configuration of an auxiliary device for measuring mechanical characteristics of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for testing the opening and closing characteristics of the circuit breaker in the embodiment of the invention;
FIG. 3 is a schematic diagram of a substation primary equipment wiring in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a circuit breaker opening and closing characteristic testing system in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an internal circuit structure of an auxiliary device for measuring mechanical characteristics of a circuit breaker according to an embodiment of the present invention.
As shown in fig. 1, an auxiliary device for measuring mechanical characteristics of a circuit breaker includes a test signal input module, a reference signal generation module, a test signal amplification module, and a switch module; the test signal input module is connected with the test signal amplification module, the reference signal generation module is connected with the test signal amplification module, and the test signal amplification module is connected with the switch module.
In a specific implementation process, the test signal input module is used for acquiring an electric signal to be tested generated by a circuit breaker on a power grid side in an opening state or a closing state, the reference signal generation module can generate a reference signal set by a power technician by means of a voltage signal of peripheral power equipment, the test signal amplification module is used for generating a comparison result of the reference signal and the electric signal to be tested and feeding the comparison result back to the switch module, and finally the switch module directly judges the current working state of the circuit breaker and simultaneously realizes access test of a mechanical characteristic tester during closing of the circuit breaker.
Based on the auxiliary device for measuring the mechanical characteristics of the circuit breaker according to the embodiment of the invention, fig. 2 illustrates a method for testing the opening and closing characteristics of the circuit breaker in detail.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a method for testing opening and closing characteristics of a circuit breaker according to an embodiment of the present invention.
As shown in fig. 2, a method for testing opening and closing characteristics of a circuit breaker includes the following steps:
s101, acquiring an electric signal to be tested at the side of a power grid where a breaker is located;
in the embodiment of the present invention, an acquisition early-stage work description is performed in combination with the wiring schematic diagram of the primary equipment of the substation shown in fig. 3 in the embodiment of the present invention, where 104 is a 110kV high-voltage circuit breaker and the loop resistance in the closed state is about 23 μ Ω, and 10418 and 10438 are both grounding disconnecting links and the respective loop resistances are about 1000 μ Ω. Based on be provided with current output port an, current input port b, signal acquisition port c and spare port d for no use on the circuit breaker mechanical characteristics measures auxiliary device, at first by circuit breaker mechanical characteristics measures auxiliary device and provides 100A's direct current power supply I to the electric wire netting side through current output port a in the test process, usable hall current sensor is right this moment the induced electrical signal of circuit breaker switch side gathers, and the concrete performance is:
(1) when the circuit breaker 104 is opened, the dc power I is imported into the current input port b (the grounding knife-switch 10418 and the grounding knife-switch 10438) only through the grounding knife-switch 10418 and the grounding knife-switch 10438The grounding knife switch 10438 may be connected through a field counterpoise), i.e., I ═ I1、I2When the signal acquisition port c is not connected with the hall current sensor, the hall current sensor is not connected with the signal acquisition port c;
(2) when the circuit breaker 104 is switched on, since the loop resistance of the circuit breaker 104 is much smaller than that of any grounding knife-switch, the direct current power supply I basically sinks into the current input port b through the hall current sensor and the circuit breaker 104, i.e. I ≈ I2、I1And 0, the hall current sensor can acquire an induced current signal flowing through the circuit breaker 104 and inject the induced current signal into the signal acquisition port c for identification.
In addition, in the embodiment of the present invention, by using the difference of the magnitude of the main loop resistance value of the circuit breaker 104 and the branch resistance values of the grounding switch 10418 and the grounding switch 10438, another signal acquisition manner is provided, that is, the loop resistance values at two ends of the circuit breaker are tested based on the dc dual-arm bridge, and the tested loop resistance values are converted into the electrical signals to be tested (which may be voltage signals or current signals), and output to the signal acquisition port c for identification. The method belongs to the prior art, can be used as a backup for the signal acquisition mode, and is not described herein again.
S102, amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal, and generating a switch driving signal;
in the implementation process of the invention, firstly, based on the level state of the electric signal to be tested, a signal amplifier is utilized to amplify the voltage of the electric signal to be tested, and a final voltage comparison signal is generated; and secondly, acquiring the level state of the voltage comparison signal, calling a signal comparator with a reference signal matched with the level state of the voltage comparison signal to compare and output the voltage comparison signal, and generating a switch driving signal.
Specifically, taking the induced current signal obtained in step S101 as an example, the internal circuit structure diagram of the auxiliary device for measuring mechanical characteristics of a circuit breaker shown in fig. 1 is used for analysis: (1) when the induced current signal is at a high level, a-15V voltage signal can be output through the signal amplifier U1, and at the moment, the-15V voltage signal can be compared with a-Vref reference signal through the signal comparator U3 to generate a high-level switch driving signal; (2) when the induced current signal is at a low level, the signal amplifier U1 can output a +15V voltage signal, and at this time, the signal comparator U2 can be used to compare the +15V voltage signal with a + Vref reference signal to generate a high-level switch driving signal, thereby ensuring that the circuit breaker mechanical characteristic measurement auxiliary device can correctly cope with the induced current signal.
According to the specific circuit diagram of the reference signal generation module in fig. 1, the following can be calculated by combining the voltage division principle: -Vref＝[12kΩ/(12kΩ+82kΩ)]X (-15V) ≈ 1.9V, and can obtain + Vref≈+1.9V。
S103, identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
In the implementation process of the invention, a switching triode is used for carrying out closing response on the switching driving signal, the closing time of the switching triode is recorded based on a mechanical characteristic tester, and the closed state information of the circuit breaker is generated.
Specifically, according to the high-level switch driving signal generated in step S102, the switching transistor Q1 may be driven to be in a conducting state, and at this time, a "closed position" state is displayed on the mechanical characteristic tester connected to the P1 terminal, that is, the current circuit breaker 104 is verified to be in a closed state, and the current closing time of the switching transistor Q1 is recorded; on the contrary, if the circuit breaker 104 is tripped into the open state, no inductive current signal is injected into the signal acquisition port c, at this time, the switching transistor Q1 is in the open state due to lack of high-level switching driving signal input, at this time, the mechanical characteristic tester connected to the P1 terminal displays the "open position" state, that is, the current circuit breaker 104 is verified to be in the open state, and at the same time, the current off time of the switching transistor Q1 is recorded, so that the on-off time of the circuit breaker 104 can be reflected.
In the embodiment of the invention, the automatic identification of the opening and closing characteristics of the circuit breaker can be realized by analyzing and processing the electric signals to be tested on the power grid side where the circuit breaker is positioned, the grounding disconnecting switches on two sides of the circuit breaker are not required to be disconnected on site by substation operators, a mechanical characteristic tester is favorable for being connected to continuously execute a mechanical characteristic test at a proper time, the site workload of the substation operators can be reduced, the overhauling working efficiency is improved, and the working cost is reduced.
Based on the auxiliary device for measuring the mechanical characteristics of the circuit breaker according to the embodiment of the invention, fig. 4 illustrates a circuit breaker opening and closing characteristic testing system in detail.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a circuit breaker opening and closing characteristic testing system in an embodiment of the present invention.
As shown in fig. 4, a circuit breaker opening and closing characteristic testing system includes:
the acquisition module 201 is used for acquiring an electric signal to be tested on the power grid side where the circuit breaker is located;
in the embodiment of the present invention, an acquisition early-stage work description is performed in combination with the wiring schematic diagram of the primary equipment of the substation shown in fig. 3 in the embodiment of the present invention, where 104 is a 110kV high-voltage circuit breaker and the loop resistance in the closed state is about 23 μ Ω, and 10418 and 10438 are both grounding disconnecting links and the respective loop resistances are about 1000 μ Ω. Based on be provided with current output port an, current input port b, signal acquisition port c and spare port d for no use on the circuit breaker mechanical characteristics measures auxiliary device, at first by circuit breaker mechanical characteristics measures auxiliary device and provides 100A's direct current power supply I to the electric wire netting side through current output port a in the test process, usable hall current sensor is right this moment the induced electrical signal of circuit breaker switch side gathers, and the concrete performance is:
(1) when the circuit breaker 104 is opened, the dc power I is only shunted to the current input port b through the grounding switch 10418 and the grounding switch 10438 (the grounding switch 10418 and the grounding switch 10438 may be connected through the on-site ground grid), i.e. I ═ I1、I2When the signal acquisition port c is not connected with the hall current sensor, the hall current sensor is not connected with the signal acquisition port c;
(2) when the circuit breaker 104 is closed,since the loop resistance of the breaker 104 is much smaller than that of any grounding disconnecting link, the direct current power supply I basically sinks into the current input port b through the Hall current sensor and the breaker 104, i.e. I ≈ I2、I1And 0, the hall current sensor can acquire an induced current signal flowing through the circuit breaker 104 and inject the induced current signal into the signal acquisition port c for identification.
In addition, in the embodiment of the present invention, by using the difference of the magnitude of the main loop resistance value of the circuit breaker 104 and the branch resistance values of the grounding switch 10418 and the grounding switch 10438, another signal acquisition manner is provided, that is, the loop resistance values at two ends of the circuit breaker are tested based on the dc dual-arm bridge, and the tested loop resistance values are converted into the electrical signals to be tested (which may be voltage signals or current signals), and output to the signal acquisition port c for identification. The method belongs to the prior art, can be used as a backup for the signal acquisition mode, and is not described herein again.
The processing module 202 is configured to amplify the electrical signal to be tested, compare the processed electrical signal to be tested based on a set reference signal, and generate a switch driving signal;
in the implementation process of the invention, firstly, based on the level state of the electric signal to be tested, a signal amplifier is utilized to amplify the voltage of the electric signal to be tested, and a final voltage comparison signal is generated; and secondly, acquiring the level state of the voltage comparison signal, calling a signal comparator with a reference signal matched with the level state of the voltage comparison signal to compare and output the voltage comparison signal, and generating a switch driving signal.
Specifically, taking the induced current signal obtained by operating the acquisition module 201 as an example, the analysis is performed by combining the internal circuit structure diagram of the auxiliary device for measuring the mechanical characteristics of the circuit breaker shown in fig. 1: (1) when the induced current signal is at a high level, a-15V voltage signal can be output through the signal amplifier U1, and at the moment, the-15V voltage signal can be compared with a-Vref reference signal through the signal comparator U3 to generate a high-level switch driving signal; (2) when the induced current signal is at a low level, the signal amplifier U1 can output a +15V voltage signal, and at this time, the signal comparator U2 can compare the +15V voltage signal with a + Vref reference signal to generate a high-level switch driving signal, thereby ensuring that the circuit breaker mechanical characteristic measurement auxiliary device can correctly cope with the induced current signal.
According to the specific circuit diagram of the reference signal generation module in fig. 1, the following can be calculated by combining the voltage division principle: -Vref＝[12kΩ/(12kΩ+82kΩ)]X (-15V) ≈ 1.9V, and can obtain + Vref≈+1.9V。
And the identification module 203 is used for identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
In the implementation process of the invention, a switching triode is used for carrying out closing response on the switching driving signal, the closing time of the switching triode is recorded based on a mechanical characteristic tester, and the closed state information of the circuit breaker is generated.
Specifically, according to the high-level switch driving signal generated by operating the processing module 202, the switching transistor Q1 may be driven to be in a conducting state, and at this time, a "closed position" state is displayed on the mechanical characteristic tester connected to the P1 terminal, that is, the current circuit breaker 104 is verified to be in a closed state, and the current closing time of the switching transistor Q1 is recorded; on the contrary, if the circuit breaker 104 is tripped into the open state, no inductive current signal is injected into the signal acquisition port c, at this time, the switching transistor Q1 is in the open state due to lack of high-level switching driving signal input, at this time, the mechanical characteristic tester connected to the P1 terminal displays the "open position" state, that is, the current circuit breaker 104 is verified to be in the open state, and at the same time, the current off time of the switching transistor Q1 is recorded, so that the on-off time of the circuit breaker 104 can be reflected.
In the embodiment of the invention, the automatic identification of the opening and closing characteristics of the circuit breaker can be realized by analyzing and processing the electric signals to be tested on the power grid side where the circuit breaker is positioned, the grounding disconnecting switches on two sides of the circuit breaker are not required to be disconnected on site by substation operators, a mechanical characteristic tester is favorable for being connected to continuously execute a mechanical characteristic test at a proper time, the site workload of the substation operators can be reduced, the overhauling working efficiency is improved, and the working cost is reduced.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The method and the system for testing the opening and closing characteristics of the circuit breaker provided by the embodiment of the invention are described in detail, a specific example is adopted in the method to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for testing the opening and closing characteristics of a circuit breaker is characterized by comprising the following steps:
acquiring an electric signal to be tested at the side of a power grid where a breaker is located;
amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal, and generating a switch driving signal;
and identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
2. The method for testing the opening and closing characteristics of the circuit breaker according to claim 1, wherein the step of acquiring the electric signals to be tested on the power grid side where the circuit breaker is located comprises the steps of:
collecting an induced electric signal at the switch side of the circuit breaker by using a Hall current sensor; or the like, or, alternatively,
and testing loop resistance values at two ends of the circuit breaker based on the direct-current double-arm bridge, and converting the loop resistance values obtained by testing into electric signals to be tested for output.
3. The method for testing the opening and closing characteristics of the circuit breaker according to claim 1, wherein the amplifying the electric signal to be tested comprises:
and based on the level state of the electric signal to be tested, performing voltage amplification on the electric signal to be tested by using a signal amplifier to generate a final voltage comparison signal.
4. The circuit breaker opening and closing characteristic testing method according to claim 3, wherein the comparing the processed electric signals to be tested based on the set reference signal to generate the switch driving signal comprises:
and acquiring the level state of the voltage comparison signal, calling a signal comparator with a reference signal matched with the level state of the voltage comparison signal to compare and output the voltage comparison signal, and generating a switch driving signal.
5. The method for testing the opening and closing characteristics of the circuit breaker according to claim 4, wherein the identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal comprises:
and performing closing response on the switch driving signal by using a switch triode, recording closing time of the switch triode based on a mechanical characteristic tester, and generating state information of the closed state of the circuit breaker.
6. The utility model provides a circuit breaker divide-shut brake characteristic test system which characterized in that, the system includes:
the acquisition module is used for acquiring an electric signal to be tested at the power grid side where the circuit breaker is located;
the processing module is used for amplifying the electric signal to be tested, comparing the processed electric signal to be tested based on a set reference signal and generating a switch driving signal;
and the identification module is used for identifying and recording the opening and closing state and the opening and closing time of the circuit breaker according to the state of the switch driving signal.
7. The circuit breaker opening and closing characteristic testing system according to claim 6, wherein the collecting module is used for collecting the induced electrical signal at the switch side of the circuit breaker by using a Hall current sensor; or the loop resistance values at the two ends of the circuit breaker are tested based on the direct-current double-arm bridge, and the loop resistance values obtained through testing are converted into electric signals to be tested to be output.
8. The circuit breaker opening and closing characteristic testing system according to claim 6, wherein the processing module is configured to perform voltage amplification on the electrical signal to be tested by using a signal amplifier based on a level state of the electrical signal to be tested, so as to generate a final voltage comparison signal.
9. The circuit breaker opening and closing characteristic testing system according to claim 8, wherein the processing module is further configured to obtain a level state of the voltage comparison signal, and call a signal comparator with a reference signal adapted to the level state of the voltage comparison signal to compare and output the voltage comparison signal, so as to generate a switch driving signal.
10. The circuit breaker opening and closing characteristic testing system according to claim 9, wherein the identification module is configured to perform a closing response on the switch driving signal by using a switch transistor, record closing time of the switch transistor based on a mechanical characteristic tester, and generate state information that the circuit breaker has been closed.
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| CN214335148U (en) * | 2020-11-10 | 2021-10-01 | 广西电网有限责任公司南宁供电局 | Novel circuit breaker mechanical characteristic measurement auxiliary device |
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| CN111208420A (en) * | 2020-02-26 | 2020-05-29 | 南京南瑞继保电气有限公司 | Generator grounding switch state detection method and system based on signal injection |
| CN113138332A (en) * | 2021-03-29 | 2021-07-20 | 杭州西湖电子研究所 | Three-phase high-voltage circuit breaker integrated measurement method based on double-end grounding |
| CN114167268A (en) * | 2021-11-15 | 2022-03-11 | 广西电网有限责任公司南宁供电局 | Circuit breaker characteristic test auxiliary device |
| CN114167268B (en) * | 2021-11-15 | 2024-01-16 | 广西电网有限责任公司南宁供电局 | Circuit breaker characteristic test auxiliary device |
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