Multi-device circuit connector for primary and secondary load testing

Abstract

The present invention discloses a multi-device circuit connector for primary and secondary load testing, which belongs to the technical field of circuit connectors and includes a secondary side socket and a device socket, wherein the secondary side socket and the device socket are respectively provided with a plurality of groups of secondary side connection posts and a plurality of groups of device connection posts. The present invention can continuously change the direction of the magnetic field formed on the periphery of the current transformer according to the change in the direction of the current on the secondary side connection post in the secondary side circuit of the current transformer through the setting of the polarity conversion component, and utilize the influence of the magnetic field force on the charge of the arc guide plate to convert the direction change of the current on the secondary side of the current transformer into the voltage change on the arc guide plate, so as to facilitate the determination of the polarity of the secondary current loop. At the same time, the setting of the disassembly protection component can be used to make the two short-circuit semicircular plates dock with each other by using a telescopic rod during disassembly, so that the secondary side of the current transformer is continuously in a short-circuit state after the test is completed, thereby ensuring the safe use of the current transformer during the entire test process.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit connectors, in particular to a multi-device circuit connector for primary and secondary load testing. Background Art

[0002] A current transformer is an instrument that converts large primary current into small secondary current for measurement based on the principle of electromagnetic induction. In an AC circuit, the direction of current changes at any time. At a given moment, one of the terminals of the current transformer coil must have current flowing in and the other out. The current induced by the secondary coil also has a direction of inflow and outflow. With the continuous development and innovation of technology, traditional substations are developing towards smart substations.

[0003] In smart substations, the electrical analog signals from current and voltage transformers are converted to digital signals by a merging unit and then connected to relay protection devices and other secondary equipment via optical fiber. This makes conventional secondary voltage application and secondary current flow tests difficult to conduct at the same site, especially when the current and voltage merging units are located in different locations. Previous primary equipment current flow tests were limited to checking the secondary current amplitude of secondary equipment such as protection devices to verify the correctness of the current transformer's ratio. Confirming the polarity of the secondary current circuit was difficult. Furthermore, the wiring of current and voltage circuit systems is complex, and when many devices are connected, the circuits are prone to open and short circuit faults. Given that a large number of secondary AC circuits throughout the plant and station have already been wired, especially some critical circuits that can only be verified correctly during the load phase, how to effectively detect wiring defects and ensure the correct integrity of the circuits before energizing them is a very difficult problem. To address this issue, a multi-device circuit connector for primary and secondary load testing is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a multi-device circuit connector for primary and secondary load testing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-device circuit connector for primary and secondary load testing, comprising a secondary side socket and a device socket, wherein the secondary side socket and the device socket are respectively provided with multiple sets of secondary side posts and multiple sets of device posts, and each set of secondary side posts and device posts has two in number, and multiple voltage sensors are provided on the outside of the secondary side posts, and the voltage sensors are connected to a polarity conversion component for detecting the direction of the secondary current of the current transformer;

[0007] The top end of the secondary side connecting column is fixedly connected to a piston sleeve, and the piston sleeve is connected to a guide column through a retracting assembly. The guide column and the end of the equipment connecting column are both connected to a docking guide plate. The outer wall of the top end of the guide column is connected to a disconnecting permanent magnet ring. A short-circuit assembly for short-circuit protection in front of the secondary side load of the current transformer is provided between the two secondary side connecting columns of a single group. A disconnecting assembly for equipment protection in front of the secondary side load of the current transformer is provided below the disconnecting permanent magnet ring. A transfer conductive ring is sleeved on the outer wall of the bottom end of the secondary side connecting column, and two adjacent transfer conductive rings are connected by a disassembly protection assembly.

[0008] Preferably, the secondary side connection seat and the equipment connection seat are assembled and connected by a plurality of bolts, and the secondary side connection posts in the secondary side connection seat correspond to the arrangement positions of the equipment connection posts in the equipment connection seat in a one-to-one manner.

[0009] Preferably, the polarity conversion assembly includes a correction power supply ring and a plurality of arc-shaped guide plates, and the plurality of arc-shaped guide plates are arranged in a circular array on the correction power supply ring. The inner end face of the secondary side socket is fixedly connected to the voltage sensor, and the voltage sensor is electrically connected to the two sides of the arc-shaped guide plate through two fixed guide rods. The correction power supply ring is electrically connected to the upper and lower ends of the arc-shaped guide plate.

[0010] Preferably, the retracting assembly includes a return spring arranged in the piston sleeve, the inner end surface of the piston sleeve is slidably connected to the guide column through the return spring, and the top end of the secondary side connecting column is electrically connected to the guide column through a soft wire with a margin.

[0011] Preferably, the guide column is electrically connected to the docking guide plate in the secondary side socket, the equipment column is electrically connected to the docking guide plate in the equipment socket, the side wall of the docking guide plate located in the secondary side socket is electrically connected to a short-circuit plate, and the outer side walls of the two docking guide plates facing each other are fixedly connected with corresponding limit sleeves.

[0012] Preferably, the short-circuit assembly includes a short-circuit magnetic repelling ring and a plurality of short-circuit magnetic attracting columns. The outer side walls of two adjacent piston sleeves are commonly connected to a recess. The bottom end of the recess is fixedly connected to an external power supply. The top end of the recess is fixedly connected to a U-shaped short-circuit rod through a telescopic column. The outer side wall of the bottom end of the telescopic column is fixedly connected to the short-circuit magnetic repelling ring. The plurality of short-circuit magnetic attracting columns are arranged on the outside of the short-circuit magnetic repelling ring. The outer side wall of the top end of the telescopic column is fixedly connected to a short-circuit permanent magnet ring.

[0013] Preferably, the circuit breaker assembly includes a circuit breaker magnetic ring and multiple circuit breaker magnetic repelling columns. The circuit breaker magnetic ring is fixedly connected to the outer wall of the piston sleeve. The multiple circuit breaker magnetic repelling columns are arranged on the outside of the circuit breaker magnetic ring. The circuit breaker permanent magnet ring is fixedly connected to the top of the guide column. The external power supply is electrically connected to the short-circuit magnetic column and the circuit breaker magnetic repelling column respectively.

[0014] Preferably, a shielding cover is fixedly connected to the outer side wall of the secondary-side connecting column, and the top end of the shielding cover is rotatably connected to two mutually symmetrical insulating ceramic plates by controlling a rotating seat.

[0015] Preferably, the disassembly protection assembly includes two conductive springs and two short-circuit semicircular plates. The adapter conductive ring is electrically connected to the short-circuit semicircular plate through the conductive spring. Both ends of the two short-circuit semicircular plates are connected by a telescopic rod. The bottom end of the secondary side socket is fixedly connected with a plurality of trapezoidal columns. The trapezoidal columns are arranged between two adjacent adapter conductive rings, and the two short-circuit semicircular plates are sleeved on the outer wall of the trapezoidal columns.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This solution, through the setting of the polarity conversion component, can continuously change the direction of the magnetic field formed on its periphery according to the change of the current direction on the secondary side terminal in the secondary side circuit of the current transformer. By utilizing the influence of the magnetic field force on the charge of the arc-shaped guide plate, the direction change of the current on the secondary side of the current transformer is converted into the voltage change on the arc-shaped guide plate, which is convenient for determining the current direction of the secondary side circuit.

[0018] 2. This solution uses the short-circuit component and the circuit-breaker component to short-circuit the secondary circuit before the load is applied, and then uses the circuit-breaker component to disconnect the secondary circuit when the load is applied. This ensures that the secondary circuit is short-circuited before disconnecting, ensuring the safe use of the current transformer, and then disconnecting the circuit in time to ensure the safety of the secondary equipment under live load testing.

[0019] 3. This solution uses the disassembly protection component to separate the two short-circuit semicircular plates on the trapezoidal column, ensuring that the two transfer conductive rings are disconnected under the test state. During disassembly, the two short-circuit semicircular plates are docked with each other using a telescopic rod, thereby allowing the secondary side of the current transformer to remain in a short-circuit state after the test is completed, ensuring the safe use of the current transformer during the entire test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0021] Figure 2 This is an assembly diagram of the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0022] Figure 3 This is a structural schematic diagram of the bottom of the secondary side socket in the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the internal structure of the secondary side socket in the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0025] Figure 6 This is a structural schematic diagram of the position of the trapezoidal column in the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0026] Figure 7 This is a schematic diagram of the structure inside the shielding cover of the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0027] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0028] Figure 9 This is a schematic structural diagram of a polarity conversion component in a multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0029] Figure 10 This is a schematic structural diagram of the retractable assembly in the multi-device circuit connector for primary and secondary load testing proposed by the present invention;

[0030] Figure 11 This is a structural schematic diagram of the disassembly protection component in the multi-device circuit connector for primary and secondary load testing proposed by the present invention.

[0031] In the figure: 1. Secondary side socket; 2. Equipment socket; 3. Bolt; 4. Secondary side column; 5. Voltage sensor; 6. Arc guide plate; 7. Correction power supply ring; 8. Shielding cover; 9. Piston sleeve; 10. Reset spring; 11. Guide column; 12. Docking guide plate; 13. Limit sleeve; 14. Equipment column; 15. Recess; 16. External power supply; 17. Circuit breaker magnetic ring; 18. Circuit breaker repelling magnetic column; 19. Circuit breaker permanent magnetic ring; 20. Short-circuit repelling magnetic ring; 21. Short-circuit magnetic column; 22. Telescopic column; 23. Short-circuit permanent magnetic ring; 24. U-shaped shorting rod; 25. Shorting plate; 26. Trapezoidal column; 27. Adapter conductive ring; 28. Conductive spring; 29. ​​Short-circuit semicircular plate; 30. Telescopic rod; 31. Control swivel seat; 32. Isolating ceramic plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] Example, see Figures 1 to 11 A multi-device circuit connector for primary and secondary load testing includes a secondary side socket 1 and a device socket 2. The secondary side socket 1 and the device socket 2 are respectively provided with multiple sets of secondary side posts 4 and multiple sets of device posts 14, and the number of each set of secondary side posts 4 and device posts 14 is two. Multiple voltage sensors 5 are provided on the outer side of the secondary side posts 4. The voltage sensors 5 are connected to a polarity conversion component for detecting the direction of the secondary side current of the current transformer;

[0036] Furthermore, the secondary side socket 1 and the equipment socket 2 are assembled and connected by multiple bolts 3. The secondary side connection column 4 in the secondary side socket 1 corresponds to the setting position of the equipment connection column 14 in the equipment socket 2. The polarity conversion assembly includes a correction power supply ring 7 and multiple arc-shaped guide plates 6. The multiple arc-shaped guide plates 6 are arranged in a circular array on the correction power supply ring 7. The inner end surface of the secondary side socket 1 is fixedly connected to the voltage sensor 5. The voltage sensor 5 is electrically connected to the two sides of the arc-shaped guide plate 6 through two fixed guide rods. The correction power supply ring 7 is electrically connected to the upper and lower ends of the arc-shaped guide plate 6.

[0037] It should be noted that: the adapter conductive ring 27 is tightly sleeved on the secondary side wiring of the current transformer and electrically connected to the bottom end of the secondary side terminal 4 at the bottom of the secondary side socket 1, and then the power equipment on the secondary side of the current transformer that needs to be tested with a live load is electrically connected to the device terminal 14 on the device socket 2. The secondary side socket 1 and the device socket 2 are fixed and assembled by multiple bolts 3. After the assembly is completed, the guide column 11 pushes the docking guide plate 12 in the secondary side socket 1 and the docking guide plate 12 in the device socket 2 to press each other under the action of the elastic force of the return spring 10 (the position of the docking guide plate 12 in the secondary side socket 1 is detailed in the FIG. Figure 2 , the position of the docking guide plate 12 in the equipment socket 2 is detailed in Figure 3 ), the two limit sleeves 13 are adapted to be connected to each other, which can prevent the two docking guide plates 12 from shaking and misaligning in the future. Then, the test AC circuit on the primary side of the current transformer is connected, and the secondary side of the current transformer is electrically connected to the power equipment to be tested through the above-mentioned circuit connector structure;

[0038] During the power-on process, the correction power supply ring 7 applies an external circuit to the upper and lower ends of the arc-shaped guide plate 6, so that electric charges will continuously pass through the arc-shaped guide plate 6. Since there is current passing through the secondary-side terminal 4, a circular magnetic field will be formed on the outside of the secondary-side terminal 4. The electric charges on the arc-shaped guide plate 6 will be affected by the circular magnetic field and move toward one side of the arc-shaped guide plate 6, which will cause a potential difference to be formed on both sides of the arc-shaped guide plate 6. Since the direction of the current on the secondary-side terminal 4 continues to change, the direction of the formed magnetic field will also change accordingly, thereby causing the direction of movement of the electric charges on the arc-shaped guide plate 6 to change. During this process, the voltage sensor 5 will record the change in the voltage of the arc-shaped guide plate 6 and compare it with the direction of the alternating current tested on the primary side of the current transformer;

[0039] The advantages of the above are as follows: in this way, the direction of the magnetic field formed around the secondary terminal 4 of the current transformer secondary circuit can be continuously changed according to the change in the direction of the current on the secondary terminal 4. By utilizing the influence of the magnetic field force on the charge of the arc-shaped guide plate 6, the change in the direction of the current on the secondary side of the current transformer can be converted into the change in the voltage on the arc-shaped guide plate 6, thereby facilitating the determination of the current direction of the secondary circuit;

[0040] The top of the secondary-side connecting post 4 is fixedly connected to a piston sleeve 9, which is connected to a guide post 11 through a retracting assembly. The ends of the guide post 11 and the equipment connecting post 14 are both connected to a docking guide plate 12. The outer wall of the top of the guide post 11 is connected to a disconnecting permanent magnet ring 19. A short-circuit assembly for short-circuit protection before the secondary-side load of the current transformer is provided between the two secondary-side connecting posts 4 of a single group. A disconnecting assembly for equipment protection before the secondary-side load of the current transformer is provided below the disconnecting permanent magnet ring 19.

[0041] Furthermore, the retracting and pulling assembly includes a return spring 10 arranged in the piston sleeve 9, the inner end surface of the piston sleeve 9 is slidably connected to the guide column 11 through the return spring 10, the top of the secondary side connecting column 4 is electrically connected to the guide column 11 through a soft wire with a surplus, the guide column 11 is electrically connected to the docking guide plate 12 in the secondary side connecting seat 1, the equipment connecting column 14 is electrically connected to the docking guide plate 12 in the equipment connecting seat 2, the side wall of the docking guide plate 12 located in the secondary side connecting seat 1 is electrically connected with a short-circuit plate 25, and the outer side walls of the two upper and lower opposite docking guide plates 12 are fixedly connected with corresponding limit sleeves 13, the short-circuit assembly includes a short-circuit repelling magnetic ring 20 and a plurality of short-circuit magnetic attracting columns 21, the outer side walls of the two adjacent piston sleeves 9 are commonly connected with a recess 15, the bottom end of the recess 15 is fixedly connected to an external power supply 16, and the recess 15 The top is fixedly connected to a U-shaped shorting rod 24 through a telescopic column 22, the outer wall of the bottom end of the telescopic column 22 is fixedly connected to the shorting repelling magnetic ring 20, and multiple shorting magnetic attractive columns 21 are arranged on the outside of the shorting repelling magnetic ring 20. The outer wall of the top of the telescopic column 22 is fixedly connected to the shorting permanent magnetic ring 23. The circuit breaker assembly includes a circuit breaker magnetic attractive ring 17 and multiple circuit breaker repelling magnetic columns 18. The circuit breaker magnetic ring 17 is fixedly connected to the outer wall of the piston sleeve 9, and multiple circuit breaker repelling magnetic columns 18 are arranged on the outside of the circuit breaker magnetic attractive ring 17. The circuit breaker permanent magnetic ring 19 is fixedly connected to the top of the guide column 11. The external power supply 16 is electrically connected to the shorting magnetic attractive column 21 and the circuit breaker repelling magnetic column 18 respectively. The outer wall of the secondary side connecting column 4 is fixedly connected to the shielding cover 8. The top of the shielding cover 8 is rotatably connected to two mutually symmetrical insulating ceramic plates 32 by controlling the rotating seat 31;

[0042] It should be noted that: when conducting a live load test on the secondary side equipment, the disconnected magnetic attraction ring 17 and the short-circuit repelling magnetic ring 20 are respectively connected to the secondary side circuit through the rectifier diode, so that the disconnected magnetic attraction ring 17 always generates a magnetic attraction force on the disconnected permanent magnetic ring 19, and the short-circuit repelling magnetic ring 20 always generates a magnetic repulsion force on the short-circuit permanent magnetic ring 23, wherein the external power supply 16 respectively passes current to the disconnected repelling magnetic column 18 and the short-circuit magnetic attraction column 21, so that the disconnected repelling magnetic column 18 always generates a magnetic repulsion force on the disconnected permanent magnetic ring 19. The permanent magnet ring 19 generates a magnetic repulsion force, which makes the short-circuited magnetic column 21 generate a magnetic attraction force on the short-circuited permanent magnet ring 23. The open-circuit permanent magnet ring 19 and the short-circuited permanent magnet ring 23 maintain the magnetic limit stability under the action of their respective magnetic repulsion and magnetic attraction forces. If the secondary side current exceeds the load value, the short-circuited repulsive ring 20 will increase the magnetic repulsion force on the short-circuited permanent magnet ring 23. The short-circuited permanent magnet ring 23 is subjected to a magnetic repulsion force greater than a magnetic attraction force, which will push the short-circuited permanent magnet ring 23 to move upward, thereby driving the telescopic column 2 2, the U-shaped short-circuit rod 24 on the upper part moves up and contacts the two short-circuit plates 25, realizing the short-circuit connection of the two secondary side terminals 4, thereby realizing the short-circuit connection of the secondary side of the current transformer. After that, the large current of the load circuit will also increase the magnetic attraction of the disconnecting magnetic ring 17 to the disconnecting permanent magnetic ring 19, so that the disconnecting permanent magnetic ring 19 drives the docking guide plate 12 to move downward. The retracting assembly does not affect the on-off of the circuit in this process, thereby realizing the disconnection of the secondary side test equipment connection circuit. Before the load, the external power supply 16 is controlled to change the magnetic field direction of the disconnecting magnetic column 18 to magnetically attract the disconnecting permanent magnetic ring 19 to ensure the continuous disconnection state of the test equipment connection circuit. The load current when the short-circuiting permanent magnetic ring 23 moves is set to be less than the load current when the disconnecting permanent magnetic ring 19 moves. At the same time, the control seat 31 controls the rotation of the isolating ceramic plate 32 to insulate and separate the upper and lower sets of docking guide plates 12 to avoid arcing when the current is disconnected.

[0043] The benefits of the above are: the short-circuit component can be used to short-circuit the secondary circuit before the load is applied, and then the circuit breaker component can be used to disconnect the secondary circuit when the load is applied. This ensures that the secondary circuit is short-circuited before disconnecting, ensuring the safety of the current transformer, and then disconnecting in time to ensure the safety of the secondary equipment under live load testing.

[0044] A transfer conductive ring 27 is sleeved on the outer side wall of the bottom end of the secondary side connecting column 4, and two adjacent transfer conductive rings 27 are connected by a disassembly protection component;

[0045] Furthermore, the disassembly protection assembly includes two conductive springs 28 and two short-circuit semicircular plates 29. The transfer conductive ring 27 is electrically connected to the short-circuit semicircular plates 29 through the conductive springs 28. Both ends of the two short-circuit semicircular plates 29 are connected by a telescopic rod 30. A plurality of trapezoidal columns 26 are fixedly connected to the bottom end of the secondary side socket 1. The trapezoidal columns 26 are arranged between two adjacent transfer conductive rings 27, and the two short-circuit semicircular plates 29 are sleeved on the outer wall of the trapezoidal columns 26.

[0046] It should be noted that: after the test is completed, when the circuit connector is removed from the secondary circuit, the two adapter conductive rings 27 are directly unplugged from the secondary-side terminal 4. During the unplugging process, the adapter conductive ring 27 will drive the short-circuit semicircular plate 29 to detach from the trapezoidal column 26 through the conductive spring 28. After the two short-circuit semicircular plates 29 are detached from the trapezoidal column 26, the two short-circuit semicircular plates 29 are butted and pressed together under the action of the telescopic rod 30, thereby achieving direct electrical connection between the two adapter conductive rings 27 (it has been described above that when assembling the circuit, the adapter conductive ring 27 is tightly sleeved on the secondary-side wiring of the current transformer to achieve electrical connection between the adapter conductive ring 27 and the secondary-side wiring of the current transformer, which will not be described in detail here). This ensures that after the circuit connector is removed, the secondary side of the current transformer is still in a short-circuit connection state, thereby continuously ensuring the safety of the current transformer;

[0047] The above advantages are as follows: the two short-circuit semicircular plates 29 can be separated from each other on the trapezoidal column 26 to ensure that the two transfer conductive rings 27 are disconnected in the test state. During disassembly, the two short-circuit semicircular plates 29 can be docked with each other using the telescopic rod 30, thereby ensuring that the secondary side of the current transformer remains in a short-circuit state after the test is completed (in this case, after the current transformer is disconnected from the circuit connector, the wiring of the secondary side wires is short-circuited), ensuring the safe use of the current transformer during the entire test process;

[0048] When the present invention is in use, the adapter conductive ring 27 is tightly sleeved on the secondary side wiring of the current transformer and electrically connected to the bottom end of the secondary side connection column 4 at the bottom of the secondary side socket 1, and then the power equipment on the secondary side of the current transformer that needs to be tested with a live load is electrically connected to the equipment connection column 14 on the equipment socket 2. The secondary side socket 1 and the equipment socket 2 are fixedly assembled by multiple bolts 3. After the assembly is completed, the guide column 11 pushes the docking guide plate 12 in the secondary side socket 1 and the docking guide plate 12 in the equipment socket 2 to press each other under the action of the elastic force of the return spring 10. The two limit sleeves 13 are adapted to be connected, which can prevent the two docking guide plates 12 from shaking and misaligning in the future. Then, the test AC circuit on the primary side of the current transformer is connected, and the secondary side of the current transformer and the power equipment to be tested are electrically connected through the above-mentioned circuit connector structure;

[0049] During the power-on process, the correction power supply ring 7 will apply an external circuit to the upper and lower ends of the arc-shaped guide plate 6, and then charges will continuously pass through the arc-shaped guide plate 6. Since current passes through the secondary-side terminal 4, a circular magnetic field will be formed on the outer side of the secondary-side terminal 4. The charges on the arc-shaped guide plate 6 will be affected by the force of the circular magnetic field and will move to one side of the arc-shaped guide plate 6, which will cause a potential difference to be formed on both sides of the arc-shaped guide plate 6. Since the direction of the current on the secondary-side terminal 4 continues to change, the direction of the magnetic field formed will also change accordingly, thereby causing the direction of the charge movement on the arc-shaped guide plate 6 to change. During this process, the voltage sensor 5 will record the change in the voltage of the arc-shaped guide plate 6 and compare it with the direction of the alternating current tested on the primary side of the current transformer. In this way, the direction of the magnetic field formed on its periphery can be continuously changed according to the change in the current direction on the secondary-side terminal 4 in the secondary circuit of the current transformer. By utilizing the influence of the magnetic field force on the charges on the arc-shaped guide plate 6, the direction change of the secondary current of the current transformer is converted into the voltage change on the arc-shaped guide plate 6, which is convenient for determining the current direction of the secondary circuit.

[0050] When conducting a live load test on the secondary side equipment, the disconnected magnetic attraction ring 17 and the short-circuit repulsive magnetic ring 20 are respectively connected to the secondary side circuit through the rectifier diode, so that the disconnected magnetic attraction ring 17 always generates a magnetic attraction force on the disconnected permanent magnetic ring 19, and the short-circuit repulsive magnetic ring 20 always generates a magnetic repulsive force on the short-circuit permanent magnetic ring 23, wherein the external power supply 16 respectively passes current through the disconnected repulsive magnetic column 18 and the short-circuit magnetic attraction column 21, so that the disconnected repulsive magnetic column 18 generates a magnetic repulsive force on the disconnected permanent magnetic ring 19, and the short-circuit magnetic attraction column 21 generates a magnetic attraction on the short-circuit permanent magnetic ring 23. Force, the open circuit permanent magnet ring 19 and the short circuit permanent magnet ring 23 maintain magnetic limit stability under the action of their respective magnetic repulsion and magnetic attraction. If the secondary side current exceeds the load value, the short circuit repulsion ring 20 will increase the magnetic repulsion force on the short circuit permanent magnet ring 23. The short circuit permanent magnet ring 23 is subjected to a magnetic repulsion force greater than the magnetic attraction force, which will push the short circuit permanent magnet ring 23 to move upward, thereby driving the U-shaped short circuit rod 24 on the telescopic column 22 to move upward and contact the two short circuit plates 25, thereby realizing the short circuit connection of the two secondary side connection columns 4, thereby realizing the connection of the secondary side of the current transformer. The line is short-circuited. After that, the large current of the load circuit will also increase the magnetic attraction of the disconnecting magnetic ring 17 to the disconnecting permanent magnetic ring 19, so that the disconnecting permanent magnetic ring 19 drives the docking guide plate 12 to move downward. The retracting component does not affect the on-off of the circuit in this process, and the secondary side test equipment connection circuit is disconnected. Before the load, the external power supply 16 is controlled to change the magnetic field direction of the disconnecting repelling magnetic column 18 to magnetically attract the disconnecting permanent magnetic ring 19 to ensure the continuous disconnection state of the test equipment connection circuit. The load current when the short-circuiting permanent magnetic ring 23 moves is set to be less than the disconnecting state. The permanent magnet ring 19 generates a load current when it moves. At the same time, the control seat 31 controls the rotation of the isolation ceramic plate 32 to insulate and separate the upper and lower sets of docking guide plates 12 to avoid arcing when the current is disconnected. In this way, the short-circuit component can be used to short-circuit the secondary circuit before the load is applied, and then the circuit breaker component can be used to disconnect the secondary circuit when the load is applied, thereby ensuring that the secondary side is short-circuited before disconnecting, ensuring the safe use of the current transformer, and then disconnecting the circuit in time to ensure the safety of the secondary side equipment under the live load test;

[0051] After the test is completed, when the circuit connector is removed from the secondary circuit, the two transfer conductive rings 27 are directly unplugged from the secondary side terminal 4. During the unplugging process, the transfer conductive ring 27 will drive the short-circuit semicircular plate 29 to detach from the trapezoidal column 26 through the conductive spring 28. After the two short-circuit semicircular plates 29 are detached from the trapezoidal column 26, the two short-circuit semicircular plates 29 are docked and pressed together under the action of the telescopic rod 30, thereby achieving direct electrical connection between the two transfer conductive rings 27 (as described above, when assembling the circuit, the transfer conductive ring 27 is tightly sleeved on the secondary side wiring of the current transformer to achieve the transfer conductive ring 27 and the secondary side wiring of the current transformer). The electrical connection is not described in detail here), thereby ensuring that after the circuit connector is removed, the secondary side of the current transformer is still in a short-circuit connection state, continuously ensuring the safety of the current transformer. In this way, the two short-circuit semicircular plates 29 can be separated from each other on the trapezoidal column 26 to ensure that the two adapter conductive rings 27 are disconnected in the test state. During disassembly, the telescopic rod 30 is used to make the two short-circuit semicircular plates 29 dock with each other, thereby allowing the secondary side of the current transformer to continue to be in a short-circuit state after the test is completed (at this time, after the current transformer is separated from the circuit connector, the connection of the secondary side wire is short-circuited), ensuring the safe use of the current transformer during the entire test process.

[0052] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A multi-device circuit connector for primary and secondary load testing, comprising a secondary side connector (1) and a device connector (2), characterized in that: The secondary side connection seat (1) and the equipment connection seat (2) are respectively provided with a plurality of groups of secondary side connection posts (4) and a plurality of groups of equipment connection posts (14), and the number of each group of secondary side connection posts (4) and equipment connection posts (14) is two. A plurality of voltage sensors (5) are provided outside the secondary side connection posts (4), and the voltage sensors (5) are connected to a polarity conversion component for detecting the direction of the secondary side current of the current transformer; The top of the secondary side connection column (4) is fixedly connected to a piston sleeve (9), the piston sleeve (9) is connected to a guide column (11) through a retracting assembly, the ends of the guide column (11) and the equipment connection column (14) are both connected to a docking guide plate (12), the outer wall of the top of the guide column (11) is connected to a disconnecting permanent magnet ring (19), a short-circuit assembly for short-circuit protection before the secondary side load of the current transformer is provided between the two secondary side connection columns (4) of a single group, a disconnecting assembly for equipment protection before the secondary side load of the current transformer is provided below the disconnecting permanent magnet ring (19), a transfer conductive ring (27) is sleeved on the outer wall of the bottom end of the secondary side connection column (4), and two adjacent transfer conductive rings (27) are connected through a disassembly protection assembly; The short-circuit assembly includes a short-circuit repelling magnetic ring (20) and a plurality of short-circuit magnetic attracting columns (21), the outer side walls of two adjacent piston sleeves (9) are commonly connected to a recess (15), the bottom end of the recess (15) is fixedly connected to an external power supply (16), the top end of the recess (15) is fixedly connected to a U-shaped short-circuit rod (24) through a telescopic column (22), the outer side wall of the bottom end of the telescopic column (22) is fixedly connected to the short-circuit repelling magnetic ring (20), the plurality of short-circuit magnetic attracting columns (21) are arranged on the outside of the short-circuit repelling magnetic ring (20), and the outer side wall of the top end of the telescopic column (22) is fixedly connected to a short-circuit permanent magnet ring (23).

2. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The secondary side connection seat (1) and the equipment connection seat (2) are assembled and connected by a plurality of bolt members (3), and the secondary side connection columns (4) in the secondary side connection seat (1) and the equipment connection columns (14) in the equipment connection seat (2) are arranged in a one-to-one correspondence.

3. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The polarity conversion assembly comprises a correction power supply ring (7) and a plurality of arc-shaped guide plates (6), wherein the plurality of arc-shaped guide plates (6) are arranged in a circumferential array on the correction power supply ring (7), the inner end surface of the secondary side socket (1) is fixedly connected to the voltage sensor (5), the voltage sensor (5) is electrically connected to both sides of the arc-shaped guide plate (6) through two fixed guide rods, and the correction power supply ring (7) is electrically connected to the upper and lower ends of the arc-shaped guide plate (6).

4. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The retracting assembly includes a return spring (10) arranged in a piston sleeve (9); the inner end surface of the piston sleeve (9) is slidably connected to the guide column (11) through the return spring (10); and the top end of the secondary side connecting column (4) is electrically connected to the guide column (11) through a soft wire with a margin.

5. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The guide column (11) is electrically connected to the docking guide plate (12) in the secondary side socket (1), the equipment socket (14) is electrically connected to the docking guide plate (12) in the equipment socket (2), the side wall of the docking guide plate (12) in the secondary side socket (1) is electrically connected to a short-circuit plate (25), and the outer side walls of the two docking guide plates (12) facing each other are fixedly connected with matching limit sleeves (13).

6. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The circuit breaker assembly includes a circuit breaker magnetic attraction ring (17) and a plurality of circuit breaker magnetic repulsion columns (18), wherein the circuit breaker magnetic attraction ring (17) is fixedly connected to the outer wall of the piston sleeve (9), and the plurality of circuit breaker magnetic repulsion columns (18) are arranged outside the circuit breaker magnetic attraction ring (17), and the circuit breaker permanent magnet ring (19) is fixedly connected to the top of the guide column (11), and the external power supply (16) is electrically connected to the short-circuit magnetic attraction column (21) and the circuit breaker magnetic repulsion column (18) respectively.

7. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The outer side wall of the secondary side connection column (4) is fixedly connected to a shielding cover (8), and the top end of the shielding cover (8) is rotatably connected to two mutually symmetrical insulating ceramic plates (32) via a control rotating seat (31).

8. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that: The disassembly protection assembly includes two conductive springs (28) and two short-circuit semicircular plates (29), the transfer conductive ring (27) is electrically connected to the short-circuit semicircular plates (29) through the conductive springs (28), and both ends of the two short-circuit semicircular plates (29) are connected by a telescopic rod (30). The bottom end of the secondary side seat (1) is fixedly connected to a plurality of trapezoidal columns (26), the trapezoidal columns (26) are arranged between two adjacent transfer conductive rings (27), and the two short-circuit semicircular plates (29) are sleeved on the outer wall of the trapezoidal columns (26).

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