A testing device and testing equipment for circuit breakers

Abstract

The application provides a kind of testing device and testing equipment of circuit breaker, belongs to circuit breaker testing technical field, and the testing device of circuit breaker includes the testing device of circuit breaker including incoming electrical connection terminal, outgoing electrical connection terminal, tripping assembly and leakage wiring assembly. Wherein, incoming electrical connection terminal is used to access the AC power supply signal to the power supply of the circuit board to be tested;Outgoing electrical connection terminal is connected with the power supply end of the circuit board to be tested;Tripping assembly is connected between incoming electrical connection terminal and outgoing electrical connection terminal;Leakage wiring assembly is connected with tripping assembly, for detachable connection power transmission line, power transmission line is used to pass through the mutual inductor connected with the circuit board to be tested and is used to transmit leakage current. Through the response of tripping assembly when transmitting leakage current on power transmission line, the test of the circuit board to be tested is realized. In this way, the test of the circuit board to be tested can be realized without installing the circuit board to be tested as a complete product, so as to improve the test efficiency.

Description

Technical Field

[0001] This application relates to the field of circuit breaker testing technology, specifically to a circuit breaker testing device and testing equipment. Background Technology

[0002] Circuit breakers are critical devices for ensuring electrical safety. Their basic structure mainly includes a circuit board, a trip unit, a tripping mechanism, and a contact system. The trip unit detects abnormal signals such as residual current and transmits them to the circuit board for further signal processing. When leakage current or other faults are detected, the circuit board issues an action command. Upon receiving the action command, the tripping mechanism drives the contact system to actuate, quickly disconnecting the circuit. Throughout this process, the performance of the circuit board is crucial to the normal operation of the circuit breaker. Therefore, during the research and development or testing phases of the circuit breaker, it is necessary to accurately test various performance aspects of the circuit board to ensure the quality of the circuit breaker.

[0003] However, current testing of circuit boards in circuit breakers typically requires a significant amount of time for soldering and assembling the boards into the complete product structure before testing can proceed. Furthermore, during the R&D or testing phases, multiple circuit boards often need to be tested, leading to inefficiency and substantial time consumption. Utility Model Content

[0004] In view of the shortcomings of the prior art, this application provides a circuit breaker testing device and testing equipment.

[0005] Firstly, this application provides a circuit breaker testing apparatus, comprising: The power input terminal is used to connect the AC power signal that supplies power to the circuit board under test; The power output terminal is connected to the power supply terminal of the circuit board under test; A tripping assembly is connected between the power input terminal and the power output terminal; A leakage current wiring assembly, connected to the tripping assembly, is used for detachably connecting a power transmission line, which is used to pass through a current transformer connected to the circuit board under test and to transmit leakage current. Specifically, the circuit board under test is tested based on the response of the tripping component when leakage current is transmitted on the power transmission line.

[0006] Optionally, the power input terminal includes a live wire input terminal and a neutral wire input terminal; the power output terminal includes a live wire output terminal and a neutral wire output terminal. The tripping assembly includes a tripping device and a tripping actuator; The tripping actuator includes a first stationary contact connected to the live wire inlet, a first moving contact connected to the trip unit, a second stationary contact connected to the neutral wire inlet, a second moving contact connected to the neutral wire outlet, and a signal input terminal connected to the trip unit; The trip unit includes a first end connected to the first moving contact of the trip actuator, a second end connected to the live wire output end, and a signal output end connected to the signal input end of the trip actuator.

[0007] Optionally, the circuit board under test obtains a leakage current detection signal based on the leakage current transmitted through the power transmission line passing through the current transformer, and transmits a leakage current control signal to the trip unit based on the leakage current detection signal, so that the trip unit outputs a trigger signal to the signal input terminal of the trip actuator to trigger the trip actuator to operate.

[0008] Optionally, the power transmission line includes a first transmission line and a second transmission line; the leakage current wiring assembly includes a first connector and a second connector; One end of the first connector is connected to the first moving contact of the tripping actuator and the first end of the tripping device, and the other end of the first connector is detachably connected to the first transmission line. One end of the second connector is connected to the second moving contact of the tripping actuator, and the other end is detachably connected to the second transmission line.

[0009] Optionally, it may also include a connection component disposed between the power output connection terminal and the power supply terminal of the circuit board under test, wherein the power output connection terminal is detachably connected to the power supply terminal of the circuit board under test via the connection component.

[0010] Optionally, the power supply terminal of the circuit board under test includes a first power supply terminal and a second power supply terminal; the connection component includes a third connector and a fourth connector; One end of the third connector is connected to the live wire output terminal, and the other end is detachably connected to the first power supply terminal. One end of the fourth connector is connected to the neutral wire output terminal, and the other end is detachably connected to the second power supply terminal.

[0011] Optionally, the first connector, the second connector, the third connector, and the fourth connector are all spring clips.

[0012] Optionally, the circuit board under test is further provided with pads for connecting the tripping structure in the circuit breaker, and the pads are left empty during the test.

[0013] Secondly, in one embodiment, this application provides a circuit breaker testing device, including a leakage current tester, a power transmission line, and the aforementioned circuit breaker testing apparatus. The leakage current tester is connected to the power input terminal and is used to output the AC power signal to the power input terminal. One end of the power transmission line is connected to the leakage current tester, and the other end passes through the current transformer and is detachably connected to the leakage current wiring assembly. The leakage current tester is used to transmit leakage current to the power transmission line.

[0014] Optionally, the power transmission line includes a first transmission line and a second transmission line; The first transmission line and the second transmission line pass through the current transformer connected to the circuit board under test and are detachably connected to the test device of the circuit breaker.

[0015] Through the above technical solution, this application includes at least the following beneficial technical effects: An AC power signal is connected via the power inlet terminal, and the power outlet terminal is connected to the power supply terminal of the circuit board under test (PCB). With the tripping assembly in the ON state, the AC power signal is transmitted sequentially through the power inlet terminal, the tripping assembly, and the power outlet terminal to the PCB, thus powering the PCB. A leakage current connection assembly is connected to the tripping assembly and can be detachably connected to the power transmission line, allowing the line to pass through the current transformer connected to the PCB and transmit leakage current. This provides a test environment with leakage current to the current transformer without the need for soldering. Finally, the tripping assembly can be used to perform leakage current testing on the PCB. This allows for testing of the PCB without requiring it to be assembled as a complete product, thereby improving testing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a test apparatus for a circuit breaker in one embodiment of this application; Figure 2 This is a circuit connection diagram of a test device for a circuit breaker in one embodiment of this application; Figure 3 This is a schematic diagram of a test device for a circuit breaker in one embodiment of this application; Figure 4 This is a circuit connection diagram of a test device for a circuit breaker in one embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 10. Circuit breaker testing device; 1. Power input terminal; 2. Power output terminal; 3. Tripping assembly; 31. Tripping device; 32. Tripping actuator; 4. Leakage current wiring assembly; 41. First connector; 42. Second connector; 5. Connecting assembly; 51. Third connector; 52. Fourth connector; 20. Power transmission line; 201. First transmission line; 202. Second transmission line; 30. Leakage current tester. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified. In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use this application. In the following description, details are set forth for illustrative purposes. It should be understood that those skilled in the art will recognize that this application can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid unnecessary detail that would obscure the description of this application. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0021] Firstly, such as Figure 1As shown, in one embodiment, this application provides a circuit breaker testing device, which includes an input connection terminal 1, an output connection terminal 2, a trip assembly, and a leakage current wiring assembly 4. The input connection terminal is used to connect an AC power signal supplying power to the circuit board under test (PCB). The output connection terminal 2 is connected to the power supply terminal of the PCB. The trip assembly 3 is connected between the input connection terminal 1 and the output connection terminal 2. The leakage current wiring assembly 4 is connected to the trip assembly 3 and is used to detachably connect a power transmission line 20, which passes through a current transformer connected to the PCB and transmits leakage current.

[0022] The power input terminal 1 includes a live wire input terminal Lin and a neutral wire input terminal Nin; the power output terminal 2 includes a live wire output terminal Lout and a neutral wire output terminal Nout; the power supply terminals of the circuit board under test (PCB) include a first power supply terminal L and a second power supply terminal N; the AC power signal includes neutral wire current and live wire current. The tripping assembly 3 is a normally closed assembly. After the power output terminal 2 is connected to the power supply terminal of the PCB, the live wire current is transmitted through the live wire input terminal Lin, the tripping assembly 3, and the live wire output terminal Lout to the first power supply terminal L of the PCB. At the same time, the neutral wire current is transmitted through the neutral wire input terminal Nin, the tripping assembly 3, and the neutral wire output terminal Nout to the second power supply terminal N of the PCB. This achieves the effect of powering the PCB after the power output terminal 2 is connected to the power supply terminal of the PCB, without the need to install the PCB into a complete product for power supply.

[0023] The power transmission line 20 includes a first transmission line 201 and a second transmission line 202. The power transmission line 20 is connected to the tripping assembly 3 via a leakage current connection assembly 4, allowing the tripping assembly 3 to provide an AC power signal to the power transmission line 20. The first transmission line 201 and the second transmission line 202 are then connected to the live wire and neutral wire respectively to create a leakage current branch, thus enabling leakage current transmission in the power transmission line 20. Furthermore, the power transmission line 20 is detachably connected to the leakage current connection assembly 4. When replacing the circuit board under test, the power transmission line 20 can be directly separated from the leakage current connection assembly 4, passed through the current transformer of the new circuit board under test, and then reconnected to the leakage current connection assembly 4. This allows for rapid replacement of the circuit board under test and provides an environment with leakage current to the current transformer without the need for soldering.

[0024] The test involves evaluating the circuit board under test based on the response of the tripping assembly 3 when leakage current is transmitted on the power transmission line 20. For example, when leakage current is transmitted on the power transmission line 20 passing through the transformer: if the tripping assembly 3 is in an open state, cutting off the AC power supply to the circuit board under test, the test result is that the circuit board is functioning normally. In this case, the leakage current connection assembly 4 also cannot provide AC power to the power transmission line 20, causing the leakage current to disappear and improving test safety. If the tripping assembly 3 is in a closed state, continuously supplying AC power to the circuit board under test, the test result is that the circuit board is malfunctioning.

[0025] In addition, if the circuit board under test functions normally, leakage current can be transmitted multiple times on the power transmission line 20 to test parameters such as the tripping time of the tripping component 3 triggered by the circuit board under test.

[0026] In the above embodiment, an AC power signal is connected to the power input terminal 1, and the power output terminal 2 is connected to the power supply terminal of the circuit board under test (PCB). With the tripping assembly 3 in the conducting state, the AC power signal is transmitted sequentially through the power input terminal, the tripping assembly 3, and the power output terminal 2 to the PCB, thus powering the PCB. The leakage current wiring assembly 4 is connected to the tripping assembly 3 and is detachably connected to the power transmission line 20, allowing the power transmission line 20 to pass through the current transformer connected to the PCB and transmit leakage current. This provides a test environment with leakage current to the current transformer without the need for soldering. Finally, the tripping assembly 3 can be used to perform leakage current testing on the PCB. Thus, testing of the PCB can be performed without assembling it as a complete product, thereby improving testing efficiency.

[0027] Reference Figure 2 As one embodiment of the trip assembly 3, the trip assembly 3 includes a trip unit 31 and a trip actuator 32; the trip actuator 32 includes a first stationary contact connected to the live wire inlet terminal Lin, a first moving contact connected to the trip unit 31, a second stationary contact connected to the neutral wire inlet terminal Nin, a second moving contact connected to the neutral wire outlet terminal Nout, and a signal input terminal connected to the trip unit 31; the trip unit 31 includes a first end connected to the first moving contact of the trip actuator 32, a second end connected to the live wire outlet terminal Lout, and a signal output terminal connected to the signal input terminal of the trip actuator 32.

[0028] In some embodiments, the circuit board under test obtains a leakage detection signal based on the leakage current transmitted on the power transmission line 20 passing through the current transformer, and transmits a leakage control signal to the trip unit 31 based on the leakage detection signal, so that the trip unit 31 outputs a trigger signal to the signal input terminal of the trip actuator 32 to trigger the trip actuator 32 to operate.

[0029] As an example, when the AC power signal is connected through the power input terminal 1, it flows to the live wire input terminal Lin and the neutral wire input terminal Nin, respectively. Under normal circumstances, the trip unit 31 has no action signal output, the first moving contact and the first stationary contact remain closed, and the current flows from the live wire input terminal Lin through the first stationary contact and the first moving contact, and then through the first end and the second end of the trip unit 31 to the live wire output terminal Lout; at the same time, the second moving contact and the second stationary contact remain closed, and the current flows from the neutral wire input terminal Nin through the second stationary contact and the second moving contact to the neutral wire output terminal Nout, thereby supplying power to the circuit board under test and the power transmission line 20. When leakage current is transmitted on the power transmission line 20, the current transformer detects the leakage current, causing the circuit board under test to output a leakage detection signal and transmit the leakage detection signal to the trip unit 31. After detecting the leakage detection signal, the trip unit 31 sends a trigger signal from its signal output terminal to the signal input terminal of the trip actuator 32. After receiving the signal, the first moving contact separates from the first stationary contact, cutting off the transmission of the live wire current. The second moving contact also separates from the second stationary contact, cutting off the transmission of the neutral wire current, thereby de-energizing the circuit board under test and the power transmission line 20.

[0030] It should be noted that the specific structure of the trip unit 31 and the trip actuator 32 is not specifically limited here, as long as they can trigger the action of the trip actuator 32 according to the leakage current detection signal output by the circuit board under test.

[0031] Reference Figure 2 As one embodiment of the leakage current wiring assembly 4, the leakage current wiring assembly 4 includes a first connector 41 and a second connector 42. One end of the first connector 41 is connected to the first moving contact of the tripping actuator 32 and the first end of the trip unit 31, and the other end of the first connector 41 is detachably connected to the first transmission line 201; one end of the second connector 42 is connected to the second moving contact of the tripping actuator 32, and the other end is detachably connected to the second transmission line 202.

[0032] In the above embodiments, by connecting one end of the first connector 41 to the first moving contact of the tripping actuator 32 and the first end of the trip unit 31, and detachably connecting the other end to the first transmission line 201, and connecting one end of the second connector 42 to the second moving contact of the tripping actuator 32, and detachably connecting the other end to the second transmission line 202, a detachable connection between the power transmission line 20 and the tripping assembly 3 can be achieved, so that the power transmission line 20 can pass through the transformer without welding, thereby improving the efficiency of providing a leakage current environment to the transformer.

[0033] Reference Figure 2 As a further embodiment of the circuit breaker testing device, the circuit breaker testing device also includes a connection component 5 disposed between the power output connection terminal 2 and the power supply terminal of the circuit board under test. The power output connection terminal 2 is detachably connected to the power supply terminal of the circuit board under test through the connection component 5.

[0034] As one embodiment of the connecting component 5, the connecting component 5 includes a third connector 51 and a fourth connector 52. One end of the third connector 51 is connected to the live wire output terminal Lout, and the other end is detachably connected to the first power supply terminal; one end of the fourth connector 52 is connected to the neutral wire output terminal Nout, and the other end is detachably connected to the second power supply terminal.

[0035] As an example, the first power supply terminal and the second power supply terminal can be conductive structures such as pads or connecting lines on the circuit board under test (TBD) for connecting to power, so that the live wire output terminal Lout can be connected to the first power supply terminal of the TBD through the third connector 51, and the neutral wire output terminal Nout can be connected to the second power supply terminal of the TBD through the fourth connector 52. The specific locations of the first power supply terminal and the second power supply terminal can vary depending on the actual design of the TBD.

[0036] In the above embodiments, the third connector 51 detachably connects the live wire output terminal Lout to the first power supply terminal, and the fourth connector 52 detachably connects the neutral wire output terminal Nout to the second power supply terminal, so that when testing the circuit board under test, power can be supplied to the circuit board under test quickly without a complicated soldering process, thus improving testing efficiency.

[0037] As an example, the first connector 41, the second connector 42, the third connector 51 and the fourth connector 52 are spring clips.

[0038] A spring clip, also known as a duckbill clip or electrical clip, is a method of temporarily connecting electrical circuits. A spring clip consists of two metal jaws and a spring structure connecting the two jaws. The two metal jaws are typically made of copper alloy, stainless steel, or iron that has undergone rust-proofing treatment such as nickel or zinc plating. The opposing sides of the two jaws have serrated textures to increase friction and ensure that the connection is not easily slipped. The spring structure provides the force to close the two jaws together. To connect, open the two jaws, place the component to be connected between them, and then close the jaws. To disconnect, press the jaws together to separate them and remove the connected component.

[0039] As an example, the first connector 41, the second connector 42, the third connector 51, and the fourth connector 52 can also be other detachable connectors with conductive functions, and no specific limitation is made here. In addition, the first connector 41 and the second connector 42 can also be provided on the power transmission line 20, as long as a detachable connection between the power transmission line 20 and the tripping assembly 3 can be achieved.

[0040] As an example, the circuit board under test is also provided with pads for connecting the tripping structure in the circuit breaker. The pads are left empty during the test.

[0041] The tripping structure refers to the tripping mechanism in the circuit breaker product when the circuit board under test is installed. During the R&D or testing phase, the tripping structure may not be installed; only the corresponding solder pads are required. The tripping structure differs from the tripping assembly 3 in the circuit breaker's testing device. Tripping assembly 3 can be a qualified product that has undergone testing to eliminate interference with the testing of the circuit board under test caused by performance differences in tripping assembly 3.

[0042] In the above embodiments, the pads on the circuit board under test (TBT) are used to connect to the tripping structure in the circuit breaker, and they function when the TBT is installed into the complete circuit breaker product. During the current R&D or testing phase, the pads used to connect to the tripping structure in the circuit breaker are left unused. This allows for performance testing of the TBT independently without the need to install the tripping structure, avoiding interference from performance differences between different tripping structures and making the testing of the TBT more accurate.

[0043] Reference Figure 3Secondly, in one embodiment, this application provides a circuit breaker testing device, including a leakage current tester 30, a power transmission line 20, and the aforementioned circuit breaker testing apparatus 10; the leakage current tester 30 is connected to the power input connection terminal 1 and is used to output an AC power signal to the power input connection terminal 1; one end of the power transmission line 20 is connected to the leakage current tester 30, and the other end passes through a current transformer and is detachably connected to the leakage current wiring assembly 4; the leakage current tester 30 is used to transmit leakage current to the power transmission line 20.

[0044] As an example, the leakage current tester 30 typically has an internal signal generation circuit that can generate an alternating current signal of a specific magnitude and frequency to simulate leakage current. Connected to the leakage current tester 30 via the power transmission line 20, the leakage current tester 30 and the power transmission line 20 form a closed loop. This allows the alternating current signal generated by the leakage current tester 30 to be transmitted through the power transmission line 20, thereby simulating the scenario of leakage current transmission on the power transmission line 20 and providing a leakage current detection environment for the current transformer.

[0045] Reference Figure 4 As one embodiment of the power transmission line 20, the power transmission line 20 includes a first transmission line 201 and a second transmission line 202; the first transmission line 201 and the second transmission line 202 pass through an instrument transformer connected to the circuit board under test and are detachably connected to the test device of the circuit breaker.

[0046] It should be noted that the testing equipment for this circuit breaker includes the aforementioned testing apparatus for circuit breakers. This testing equipment possesses all the beneficial effects of the aforementioned testing apparatus for circuit breakers, which will not be elaborated upon here.

[0047] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0048] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0049] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A testing device for a circuit breaker, characterized in that, include: The power input terminal is used to connect the AC power signal that supplies power to the circuit board under test; The power output terminal is connected to the power supply terminal of the circuit board under test; A tripping assembly is connected between the power input terminal and the power output terminal; A leakage current wiring assembly, connected to the tripping assembly, is used for detachably connecting a power transmission line, which is used to pass through a current transformer connected to the circuit board under test and to transmit leakage current. Specifically, when leakage current is transmitted on the power transmission line, the circuit board under test is tested based on the response of the tripping component.

2. The circuit breaker testing apparatus according to claim 1, characterized in that, The power input terminal includes a live wire power input terminal and a neutral wire power input terminal; the power output terminal includes a live wire power output terminal and a neutral wire power output terminal. The tripping assembly includes a tripping device and a tripping actuator; The tripping actuator includes a first stationary contact connected to the live wire inlet, a first moving contact connected to the trip unit, a second stationary contact connected to the neutral wire inlet, a second moving contact connected to the neutral wire outlet, and a signal input terminal connected to the trip unit; The trip unit includes a first end connected to the first moving contact of the trip actuator, a second end connected to the live wire output end, and a signal output end connected to the signal input end of the trip actuator.

3. The circuit breaker testing apparatus according to claim 2, characterized in that, The circuit board under test obtains a leakage detection signal based on the leakage current transmitted through the power transmission line passing through the current transformer, and transmits a leakage control signal to the trip unit based on the leakage detection signal, so that the trip unit outputs a trigger signal to the signal input terminal of the trip actuator to trigger the trip actuator to operate.

4. The circuit breaker testing apparatus according to claim 2, characterized in that, The power transmission line includes a first transmission line and a second transmission line; the leakage current wiring assembly includes a first connector and a second connector. One end of the first connector is connected to the first moving contact of the tripping actuator and the first end of the tripping device, and the other end of the first connector is detachably connected to the first transmission line. One end of the second connector is connected to the second moving contact of the tripping actuator, and the other end is detachably connected to the second transmission line.

5. The circuit breaker testing apparatus according to claim 4, characterized in that, It also includes a connection component disposed between the power output connection terminal and the power supply terminal of the circuit board under test, wherein the power output connection terminal is detachably connected to the power supply terminal of the circuit board under test via the connection component.

6. The circuit breaker testing apparatus according to claim 5, characterized in that, The power supply terminals of the circuit board under test include a first power supply terminal and a second power supply terminal; the connection components include a third connector and a fourth connector. One end of the third connector is connected to the live wire output terminal, and the other end is detachably connected to the first power supply terminal. One end of the fourth connector is connected to the neutral wire output terminal, and the other end is detachably connected to the second power supply terminal.

7. The circuit breaker testing apparatus according to claim 6, characterized in that, The first connector, the second connector, the third connector, and the fourth connector are all spring clips.

8. The testing apparatus for a circuit breaker according to any one of claims 1 to 7, characterized in that, The circuit board under test is also provided with pads, which are used to connect to the tripping structure in the circuit breaker. The pads are left empty during the test.

9. A test device for a circuit breaker, characterized in that, include: Leakage current tester, power transmission line, and test apparatus for circuit breaker as described in any one of claims 1 to 8; The leakage current tester is connected to the power input terminal and is used to output the AC power signal to the power input terminal. One end of the power transmission line is connected to the leakage current tester, and the other end passes through the current transformer and is detachably connected to the leakage current wiring assembly. The leakage current tester is used to transmit leakage current to the power transmission line.

10. The test equipment for a circuit breaker according to claim 9, characterized in that, The power transmission line includes a first transmission line and a second transmission line; The first transmission line and the second transmission line pass through the current transformer connected to the circuit board under test and are detachably connected to the test device of the circuit breaker.

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