Multi-device circuit connector for primary and secondary load test

Abstract

The invention discloses a multi-device circuit connector for primary and secondary load testing, which belongs to the technical field of circuit connectors and comprises a secondary side connecting seat and a device connecting seat, and multiple groups of secondary side connecting columns and multiple groups of device connecting columns are respectively arranged in the secondary side connecting seat and the device connecting seat. Through the arrangement of the polarity conversion assembly, the direction of a magnetic field formed on the periphery of the current transformer can be continuously changed according to the change of the current direction on a secondary side connecting column in a secondary side circuit of the current transformer; the direction change of the secondary side current of the current transformer is converted into the voltage change condition on the arc-shaped guide plate, the polarity of a secondary current loop can be conveniently determined, meanwhile, the arrangement of the dismounting protection assembly is adopted, and the two short-circuit semicircular plates can be in butt joint with each other through the telescopic rod during dismounting; therefore, the secondary side of the current transformer is continuously in a short-circuit state after the test is completed, and the use safety of the current transformer in the whole test process is ensured.

Description

Technical Field

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

[0002] A current transformer is an instrument that measures by converting a large primary current into a small secondary current based on the principle of electromagnetic induction. In an AC circuit, the direction of the current changes at any moment. At a certain instant, one of the ports of the current transformer coil must have current flowing in, and the other has current flowing out. The current induced in the secondary coil also has an in-out direction. With the continuous development and innovation of technology, traditional substations are evolving towards intelligent substations.

[0003] In an intelligent substation, after the electrical analog quantities from current and voltage transformers are converted into digital quantities by a merging unit, they are connected to relay protection devices and other secondary devices through optical fibers, which makes it difficult to conduct conventional secondary voltage application and secondary current injection tests at the same site, especially when the current and voltage merging units are located in different places. In the past, the primary equipment current injection test was only limited to checking the secondary current amplitude of secondary equipment such as protection to verify the correctness of the current transformer ratio, but it was difficult to confirm the polarity of the secondary current circuit. Moreover, the system wiring of the current and voltage circuits is complex. When there are many connected devices, the circuit is extremely prone to open circuit and short circuit faults. In the case where a large number of secondary AC circuits in the whole plant or substation have been wired, especially for some important circuits that can only be verified for correctness during the load-carrying stage, how to effectively detect wiring defects before energization and ensure the correct integrity of the circuit is a very difficult problem. Based on this, a multi-device circuit connector for primary and secondary load tests is proposed. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A multi-device circuit connector for primary and secondary load tests includes a secondary side socket and a device socket. Multiple groups of secondary side terminals and multiple groups of device terminals are respectively arranged in the secondary side socket and the device socket, and the number of each group of secondary side terminals and device terminals is two. Multiple voltage sensors are arranged outside the secondary side terminals, and the voltage sensors are connected to a polarity conversion component for detecting the current direction on the secondary side of the current transformer; A piston sleeve is fixedly connected to the top end of the secondary side connection post. The piston sleeve is connected to a guide post through a pulling and retracting assembly. Docking guide plates are connected to the ends of the guide post and the equipment connection post respectively. A short-circuit permanent magnet ring is connected to the outer side wall of the top end of the guide post. A short-circuit assembly for short-circuit protection before the secondary side of the current transformer is loaded is arranged between two secondary side connection posts in a single group. An open-circuit assembly for equipment protection before the secondary side of the current transformer is loaded is arranged below the open-circuit permanent magnet ring. A transfer conductive ring is sleeved on the outer side wall of the bottom end of the secondary side connection post. Two adjacent transfer conductive rings are connected through a disassembly protection assembly.

[0006] Preferably, the secondary side connection seat and the equipment connection seat are assembled and connected through a plurality of bolt members. The arrangement positions of the secondary side connection posts in the secondary side connection seat and the equipment connection posts in the equipment connection seat correspond one by one.

[0007] Preferably, the polarity conversion assembly includes a correction power supply ring and a plurality of arc-shaped guide plates. The plurality of arc-shaped guide plates are arranged in a circumferential array on the correction power supply ring. The inner end face of the secondary side connection seat is fixedly connected to a voltage sensor. The voltage sensor is electrically connected to both sides of the arc-shaped guide plate through two fixed guide rods respectively. The correction power supply ring is electrically connected to the upper and lower ends of the arc-shaped guide plate.

[0008] Preferably, the pulling and retracting assembly includes a return spring arranged in the piston sleeve. The inner end face of the piston sleeve is slidably connected to the guide post through the return spring. The top end of the secondary side connection post is electrically connected to the guide post through a flexible wire with a margin.

[0009] Preferably, the guide post is electrically connected to the docking guide plate in the secondary side connection seat, and the equipment connection post is electrically connected to the docking guide plate in the equipment connection seat. A short-circuit plate is electrically connected to the side wall of the docking guide plate located in the secondary side connection seat. Matching limit sleeves are fixedly connected to the outer side walls of two docking guide plates opposite to each other up and down.

[0010] Preferably, the short-circuit assembly includes a short-circuit repelling magnet ring and a plurality of short-circuit attracting magnetic columns. A concave seat is jointly connected to the outer side walls of two adjacent piston sleeves. An external power supply is fixedly connected to the bottom end of the concave seat. A U-shaped short-circuit rod is fixedly connected to the top end of the concave seat through a telescopic column. The outer side wall of the bottom end of the telescopic column is fixedly connected to the short-circuit repelling magnet ring. The plurality of short-circuit attracting magnetic columns are arranged outside the short-circuit repelling magnet ring. A short-circuit permanent magnet ring is fixedly connected to the outer side wall of the top end of the telescopic column.

[0011] Preferably, the open-circuit assembly includes an open-circuit attracting magnet ring and a plurality of open-circuit repelling magnetic columns. The open-circuit attracting magnet ring is fixedly connected to the outer side wall of the piston sleeve. The plurality of open-circuit repelling magnetic columns are arranged outside the open-circuit attracting magnet ring. The open-circuit permanent magnet ring is fixedly connected to the top end of the guide post. The external power supply is electrically connected to the short-circuit attracting magnetic columns and the open-circuit repelling magnetic columns respectively.

[0012] Preferably, a shielding cover is fixedly connected to the outer side wall of the secondary side connection post, and two symmetrically arranged isolation ceramic plates are rotatably connected to the top of the shielding cover through a control turntable.

[0013] Preferably, the disassembly protection component includes two conductive elastic sheets and two short-circuit semi-circular plates. The transfer conductive ring is electrically connected to the short-circuit semi-circular plates through the conductive elastic sheets. Both ends of the two short-circuit semi-circular plates are connected through telescopic rods. A plurality of trapezoidal columns are fixedly connected to the bottom end of the secondary side connection base. The trapezoidal columns are arranged between two adjacent transfer conductive rings. The two short-circuit semi-circular plates are sleeved on the outer side wall of the trapezoidal columns.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the setting of the polarity conversion component, according to the change of the current direction on the secondary side connection post in the secondary side circuit of the current transformer, the direction of the magnetic field formed around it can be continuously changed. By using the influence of the magnetic field force on the charges of the arc-shaped guide plate, the change of the current direction in the secondary side of the current transformer is converted into the change of the voltage on the arc-shaped guide plate, which is convenient for determining the current direction of the secondary side circuit.

[0015] 2. Through the setting of the short-circuit component and the open-circuit component, the secondary side circuit can be made in a short-circuit state by the short-circuit component before the load, and then the secondary side circuit can be disconnected by the open-circuit component during the load, so as to ensure that the secondary side is short-circuited first before the open circuit, ensuring the safe use of the current transformer, and then timely opening the circuit to ensure the safety of the secondary side equipment for the live load test.

[0016] 3. Through the setting of the disassembly protection component, the two short-circuit semi-circular plates can be separated from each other on the trapezoidal column to ensure the disconnection of the two transfer conductive rings in the test state. When disassembling, the telescopic rods are used to make the two short-circuit semi-circular plates butt against each other, so that the secondary side of the current transformer remains in a short-circuit state continuously after the test is completed, ensuring the safe use of the current transformer throughout the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of a multi-device circuit connector for primary and secondary load tests proposed by the present invention; Figure 2 is an assembly diagram of a multi-device circuit connector for primary and secondary load tests proposed by the present invention; Figure 3 is a structural schematic diagram of the bottom of the secondary side connection base in a multi-device circuit connector for primary and secondary load tests proposed by the present invention; Figure 4 is Figure 3 the enlarged view of part A in Figure 5This is a schematic diagram of the structure inside the secondary side socket of the multi-device circuit connector for primary and secondary load testing proposed by the present invention; Figure 6 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; 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; Figure 8 for Figure 7 The enlarged view of point B in the middle; 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; Figure 10 This is a schematic diagram of the structure of the retracting assembly in the multi-device circuit connector for primary and secondary load testing proposed by the present invention; Figure 11 The present invention is a schematic structural diagram of a disassembly protection component in a multi-device circuit connector for primary and secondary load testing.

[0018] 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-breaking magnetic attraction ring; 18. circuit-breaking magnetic repulsion column; 19. circuit-breaking permanent magnetic ring; 20. short-circuiting magnetic repulsion ring; 21. short-circuiting magnetic attraction column; 22. telescopic column; 23. short-circuiting permanent magnetic ring; 24. U-shaped short-circuiting rod; 25. short-circuiting plate; 26. trapezoidal column; 27. transfer conductive ring; 28. conductive spring; 29. ​​short-circuiting semicircular plate; 30. telescopic rod; 31. control swivel seat; 32. insulating ceramic plate. DETAILED DESCRIPTION

[0019] 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.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example, referring to Figures 1 to 11 , a multi-device circuit connector for primary and secondary load testing, including a secondary side socket 1 and a device socket 2. Multiple groups of secondary side connection posts 4 and multiple groups of device connection posts 14 are respectively arranged in the secondary side socket 1 and the device socket 2, and the number of each group of secondary side connection posts 4 and device connection posts 14 is two. Multiple voltage sensors 5 are arranged outside the secondary side connection posts 4, and the voltage sensors 5 are connected to a polarity conversion component for detecting the current direction on the secondary side of the current transformer. Furthermore, the secondary side socket 1 and the device socket 2 are assembled and connected through multiple bolt members 3. The arrangement orientations of the secondary side connection posts 4 in the secondary side socket 1 and the device connection posts 14 in the device socket 2 correspond one by one. The polarity conversion component 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 circumferential array on the correction power supply ring 7. The inner end face 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 respectively. The correction power supply ring 7 is electrically connected to the upper and lower ends of the arc-shaped guide plate 6. It should be noted that: the adapter conductive ring 27 is sleeved tightly on the secondary side wiring of the current transformer and is electrically connected to the bottom end of the secondary side connection post 4 at the bottom of the secondary side socket 1. Then, the power equipment that needs to be tested with a live load on the secondary side of the current transformer is electrically connected to the device connection post 14 on the device socket 2. The secondary side socket 1 and the device socket 2 are fixedly assembled through multiple bolt members 3. After the assembly is completed, under the action of the elastic force of the return spring 10, the guide post 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 be pressed against each other tightly (for the position of the docking guide plate 12 in the secondary side socket 1, see Figure 2, for the position of the docking guide plate 12 inside the device socket 2, see Figure 3 ), the two limit sleeves 13 are adapted for docking, which can prevent the two docking guide plates 12 from shaking and misaligning subsequently. Then, the test AC circuit on the primary side of the current transformer is connected. The secondary side of the current transformer and the power equipment to be tested are electrically connected through the above circuit connector structure; During the power-on process, the calibration power supply ring 7 applies an external circuit to the upper and lower ends of the arc guide plate 6. Then, there will be continuous charges passing through the arc guide plate 6. Since there is current passing through the secondary side terminal 4, a circular magnetic field will be formed outside the secondary side terminal 4. The charges on the arc guide plate 6 are affected by the force of the circular magnetic field and will move to one side of the arc guide plate 6, resulting in a potential difference on both sides of the arc guide plate 6. Since the current direction on the secondary side terminal 4 changes continuously, the direction of the formed magnetic field will also change accordingly, further causing the movement direction of the charges on the arc guide plate 6 to change. The voltage sensor 5 will record the change in the voltage of the arc guide plate 6 during this process and compare it with the direction of the alternating current tested on the primary side of the current transformer; Based on the above advantages: in this way, according to the change in the current direction on the secondary side terminal 4 in the secondary side circuit of the current transformer, the direction of the magnetic field formed outside it can be continuously changed. By utilizing the influence of the magnetic field force on the charges of the arc guide plate 6, the change in the current direction on the secondary side of the current transformer can be converted into the change in the voltage on the arc guide plate 6, which is convenient for determining the current direction of the secondary side circuit; The top of the secondary side terminal 4 is fixedly connected to a piston sleeve 9. The piston sleeve 9 is connected to a guide post 11 through a pulling and retracting assembly. Docking guide plates 12 are connected to the ends of the guide post 11 and the device terminal 14. An open-circuit permanent magnet ring 19 is connected to the outer side wall of the top of the guide post 11. A short-circuit assembly for short-circuit protection before the secondary side of the current transformer is loaded is arranged between the two secondary side terminals 4 in a single group. An open-circuit assembly for device protection before the secondary side of the current transformer is loaded is arranged below the open-circuit permanent magnet ring 19; Further, the retracting and pulling assembly includes a reset spring 10 disposed in the piston sleeve 9. The inner end face of the piston sleeve 9 is slidably connected to the guide post 11 through the reset spring 10. The top end of the secondary side connection post 4 is electrically connected to the guide post 11 through a flexible wire with a margin. The guide post 11 is electrically connected to the docking guide plate 12 in the secondary side connection base 1. The equipment connection post 14 is electrically connected to the docking guide plate 12 in the equipment connection base 2. A shorting plate 25 is electrically connected to the side wall of the docking guide plate 12 located in the secondary side connection base 1. Matching limit sleeves 13 are fixedly connected to the outer side walls of the two docking guide plates 12 facing each other up and down. The shorting assembly includes a shorting repelling magnetic ring 20 and a plurality of shorting attracting magnetic posts 21. The outer side walls of adjacent two piston sleeves 9 are commonly connected with a concave seat 15. The bottom end of the concave seat 15 is fixedly connected with an external power supply 16. The top end of the concave seat 15 is fixedly connected with a U-shaped shorting rod 24 through a telescopic column 22. The outer side wall of the bottom end of the telescopic column 22 is fixedly connected with the shorting repelling magnetic ring 20. A plurality of shorting attracting magnetic posts 21 are arranged on the outside of the shorting repelling magnetic ring 20. The outer side wall of the top end of the telescopic column 22 is fixedly connected with a shorting permanent magnetic ring 23. The open circuit assembly includes an open circuit attracting magnetic ring 17 and a plurality of open circuit repelling magnetic posts 18. The open circuit attracting magnetic ring 17 is fixedly connected with the outer side wall of the piston sleeve 9. A plurality of open circuit repelling magnetic posts 18 are arranged on the outside of the open circuit attracting magnetic ring 17. The open circuit permanent magnetic ring 19 is fixedly connected with the top end of the guide post 11. The external power supply 16 is respectively electrically connected to the shorting attracting magnetic posts 21 and the open circuit repelling magnetic posts 18. A shielding cover 8 is fixedly connected to the outer side wall of the secondary side connection post 4. Two symmetrically arranged insulating ceramic plates 32 are rotatably connected to the top end of the shielding cover 8 through a control rotating seat 31; It should be noted that: when performing a live load test on the secondary-side equipment, the open-circuit magnetic attracting ring 17 and the short-circuit magnetic repelling ring 20 are respectively connected to the secondary-side circuit through rectifying diodes, so that the open-circuit magnetic attracting ring 17 always generates a magnetic attracting force on the open-circuit permanent magnet ring 19, and the short-circuit magnetic repelling ring 20 always generates a magnetic repelling force on the short-circuit permanent magnet ring 23. The external power supply 16 respectively passes currents through the open-circuit magnetic repelling column 18 and the short-circuit magnetic attracting column 21, so that the open-circuit magnetic repelling column 18 generates a magnetic repelling force on the open-circuit permanent magnet ring 19, and the short-circuit magnetic attracting column 21 generates a magnetic attracting force on the short-circuit permanent magnet ring 23. Then, 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 repelling forces and magnetic attracting forces. If the secondary-side current is to exceed the load value, the short-circuit magnetic repelling ring 20 will increase the magnetic repelling force on the short-circuit permanent magnet ring 23. Then, the magnetic repelling force received by the short-circuit permanent magnet ring 23 is greater than the magnetic attracting force, which will push the short-circuit permanent magnet ring 23 to move upward, and then drive the U-shaped short-circuit rod 24 on the telescopic column 22 to move upward to contact the two short-circuit plates 25, realizing the short-circuit connection of the two secondary-side connection posts 4, thereby realizing the short-circuit connection of the secondary side of the current transformer. After that, the large current in the load circuit will also increase the magnetic attracting force of the open-circuit magnetic attracting ring 17 on the open-circuit permanent magnet ring 19, causing the open-circuit permanent magnet ring 19 to drive the docking guide plate 12 to move downward. The retracting and pulling assembly does not affect the on-off of the circuit during this process, realizing the disconnection of the connection circuit of the secondary-side test equipment. Before the load, the external power supply 16 is controlled to change the magnetic field direction of the open-circuit magnetic repelling column 18 to magnetize the open-circuit permanent magnet ring 19, ensuring the continuous disconnection state of the connection circuit of the test equipment. It is set that the load current when the short-circuit permanent magnet ring 23 moves is less than the load current when the open-circuit permanent magnet ring 19 moves. At the same time, the control turntable 31 will control the isolation ceramic plate 32 to rotate, insulating and separating the upper and lower groups of docking guide plates 12 that are separated, avoiding the generation of electric arcs when the current is disconnected; The benefits based on the above are as follows: In this way, the short-circuit component can be used to make the secondary-side circuit in a short-circuit state before the load, and then the open-circuit component can be used to disconnect the secondary-side circuit during the load, so as to ensure that the secondary side is short-circuited before the open circuit, ensuring the safe use of the current transformer, and then timely performing the open circuit to ensure the safety of the secondary-side equipment for the live load test; A transfer conductive ring 27 is sleeved on the outer side wall of the bottom end of the secondary-side connection post 4, and two adjacent transfer conductive rings 27 are connected through a disassembly protection component; Furthermore, the disassembly protection component includes two conductive elastic pieces 28 and two short-circuit semi-circular plates 29. The transfer conductive ring 27 is electrically connected to the short-circuit semi-circular plate 29 through the conductive elastic piece 28. Both ends of the two short-circuit semi-circular plates 29 are connected through a telescopic rod 30. A plurality of trapezoidal columns 26 are fixedly connected to the bottom end of the secondary-side connection base 1, and the trapezoidal columns 26 are arranged between two adjacent transfer conductive rings 27. The two short-circuit semi-circular plates 29 are sleeved on the outer side wall of the trapezoidal columns 26; It should be noted that: after the test is completed, when the circuit connector is removed from the secondary circuit, if the two transfer conductive rings 27 are directly pulled off from the secondary terminal 4, during the pulling-off process, the transfer conductive ring 27 will drive the short-circuit semi-circular plate 29 to disengage from the trapezoidal column 26 through the conductive elastic piece 28. After the two short-circuit semi-circular plates 29 disengage from the trapezoidal column 26, under the action of the telescopic rod 30, the two short-circuit semi-circular plates 29 will be butted and pressed together to achieve the electrical connection between the two transfer conductive rings 27 (it has been described above that when assembling the circuit, the transfer conductive ring 27 is sleeved tightly on the secondary wiring of the current transformer to achieve the electrical connection between the transfer conductive ring 27 and the secondary wiring of the current transformer, and no more details will be elaborated here). Furthermore, it is ensured that after the circuit connector is removed, the secondary side of the current transformer remains in a short-circuited connection state, continuously ensuring the safety of the current transformer; Based on the above advantages: in this way, the mutual separation of the two short-circuit semi-circular plates 29 on the trapezoidal column 26 can be utilized to ensure the disconnection of the two transfer conductive rings 27 in the test state. When disassembling, the telescopic rod 30 is used to make the two short-circuit semi-circular plates 29 butt against each other, so that the secondary side of the current transformer remains in a short-circuited state continuously after the test is completed (at this time, it is the short-circuit of the secondary wire connection after the current transformer and the circuit connector are disassembled), ensuring the safe use of the current transformer throughout the test process; When the present invention is in use, the transfer conductive ring 27 is sleeved tightly on the secondary wiring of the current transformer and is electrically connected to the bottom end of the secondary terminal 4 at the bottom of the secondary terminal block 1. Then, the power equipment that needs to be tested with a live load on the secondary side of the current transformer is electrically connected to the equipment terminal 14 on the equipment terminal block 2. The secondary terminal block 1 and the equipment terminal block 2 are fixedly assembled through a plurality of bolt members 3. After the assembly is completed, under the action of the elastic force of the return spring 10, the guide post 11 pushes the docking guide plate 12 in the secondary terminal block 1 and the docking guide plate 12 in the equipment terminal block 2 to be pressed tightly against each other, and the two limit sleeves 13 are adaptively docked, which can prevent the two docking guide plates 12 from shaking and misaligning subsequently. 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 circuit connector structure; During the power-on process, the calibration power supply ring 7 applies an external circuit to the upper and lower ends of the arc-shaped guide plate 6, so that charges continuously pass through the arc-shaped guide plate 6. Since there is current passing through the secondary side terminal 4, a circular magnetic field is formed outside the secondary side terminal 4. The charges on the arc-shaped guide plate 6 are affected by the circular magnetic field and move towards one side of the arc-shaped guide plate 6, resulting in a potential difference between the two sides of the arc-shaped guide plate 6. Since the current direction on the secondary side terminal 4 changes continuously, the direction of the formed magnetic field also changes accordingly, further causing the movement direction of the charges on the arc-shaped guide plate 6 to change. The voltage sensor 5 records the voltage change of the arc-shaped guide plate 6 during this process and compares it with the direction of the alternating current measured by the primary side of the current transformer. In this way, according to the change of the current direction on the secondary side terminal 4 in the secondary side circuit of the current transformer, the direction of the magnetic field formed outside it can be continuously changed. By utilizing the influence of the magnetic field force on the charges of the arc-shaped guide plate 6, the change of the current direction in the secondary side of the current transformer is converted into the voltage change of the arc-shaped guide plate 6, which is convenient for determining the current direction of the secondary side circuit; When performing a live load test on the secondary-side equipment, the open-circuit magnetic attracting ring 17 and the short-circuit magnetic repelling ring 20 are respectively connected to the secondary-side circuit through rectifier diodes, so that the open-circuit magnetic attracting ring 17 always generates a magnetic attracting force on the open-circuit permanent magnet ring 19, and the short-circuit magnetic repelling ring 20 always generates a magnetic repelling force on the short-circuit permanent magnet ring 23. The external power supply 16 respectively passes currents through the open-circuit magnetic repelling column 18 and the short-circuit magnetic attracting column 21, so that the open-circuit magnetic repelling column 18 generates a magnetic repelling force on the open-circuit permanent magnet ring 19, and the short-circuit magnetic attracting column 21 generates a magnetic attracting force on the short-circuit permanent magnet ring 23. Then, 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 repelling forces and magnetic attracting forces. If the secondary-side current is to exceed the load value, the short-circuit magnetic repelling ring 20 will increase the magnetic repelling force on the short-circuit permanent magnet ring 23. Then, the magnetic repelling force received by the short-circuit permanent magnet ring 23 is greater than the magnetic attracting force, which will push the short-circuit permanent magnet ring 23 to move upward, and then drive the U-shaped short-circuit rod 24 on the telescopic column 22 to move upward to contact the two short-circuit plates 25, realizing the short-circuit connection of the two secondary-side connection posts 4, thereby realizing the short-circuit of the secondary side of the current transformer. After that, the large current in the load circuit will also increase the magnetic attracting force of the open-circuit magnetic attracting ring 17 on the open-circuit permanent magnet ring 19, causing the open-circuit permanent magnet ring 19 to drive the docking guide plate 12 to move downward. The retracting and pulling assembly does not affect the on-off of the circuit during this process, realizing the disconnection of the connection circuit of the secondary-side test equipment. Before the load, the external power supply 16 is controlled to change the magnetic field direction of the open-circuit magnetic repelling column 18 to magnetize the open-circuit permanent magnet ring 19, ensuring the continuous disconnection state of the connection circuit of the test equipment. It is set that the load current when the short-circuit permanent magnet ring 23 moves is less than the load current when the open-circuit permanent magnet ring 19 moves. At the same time, the control turntable 31 will control the isolation ceramic plate 32 to rotate, insulating and separating the separated upper and lower groups of docking guide plates 12 to avoid generating an electric arc when the current is disconnected. In this way, the short-circuit assembly can be used to make the secondary-side circuit in a short-circuit state before the load, and then the open-circuit assembly can be used to disconnect the secondary-side circuit during the load, so as to ensure that the secondary side is short-circuited before the open circuit, ensuring the safe use of the current transformer, and then timely performing the open circuit to ensure the safety of the secondary-side equipment for the live load test; After the test is completed, when the circuit connector is removed from the secondary circuit, if the two transfer conductive rings 27 are directly pulled off from the secondary side terminal 4, during the pulling process, the transfer conductive ring 27 will drive the short-circuit semi-circular plate 29 to disengage from the trapezoidal column 26 through the conductive elastic piece 28. After the two short-circuit semi-circular plates 29 disengage from the trapezoidal column 26, under the action of the telescopic rod 30, the two short-circuit semi-circular plates 29 will be butted and pressed together to achieve the electrical connection between the two transfer conductive rings 27 (it has been described previously that when assembling the circuit, the transfer conductive ring 27 is sleeved tightly on the secondary side wiring of the current transformer to achieve the electrical connection between the transfer conductive ring 27 and the secondary side wiring of the current transformer, and this will not be elaborated here). Furthermore, it is ensured that after the circuit connector is removed, the secondary side of the current transformer remains in a short-circuit connection state, continuously ensuring the safety of the current transformer. In this way, the two short-circuit semi-circular plates 29 can be separated from each other on the trapezoidal column 26 to ensure the disconnection of the two transfer conductive rings 27 under the test state. When disassembling, the telescopic rod 30 is used to butt the two short-circuit semi-circular plates 29 against each other, so that the secondary side of the current transformer remains in a short-circuit state continuously after the test is completed (at this time, it is the short-circuit of the wiring of the secondary side wire after the current transformer and the circuit connector are disassembled), ensuring the safe use of the current transformer throughout the test process.

[0023] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-device circuit connector for primary and secondary load tests, comprising a secondary side socket (1) and a device socket (2), characterized in that, Multiple groups of secondary-side connection posts (4) and multiple groups of device connection posts (14) are respectively arranged in the secondary-side connection socket (1) and the device connection socket (2), and the number of each group of secondary-side connection posts (4) and device connection posts (14) is two. A plurality of voltage sensors (5) are arranged outside the secondary-side connection posts (4), and the voltage sensors (5) are connected with a polarity conversion component for detecting the current direction on the secondary side of the current transformer. A piston sleeve (9) is fixedly connected to the top end of the secondary-side connection post (4). The piston sleeve (9) is connected with a guide post (11) through a pulling and retracting component. Docking guide plates (12) are connected to the ends of the guide post (11) and the device connection post (14). A breaking permanent magnet ring (19) is connected to the outer side wall of the top end of the guide post (11). A short-circuiting component for short-circuit protection before the secondary side of the current transformer is loaded is arranged between the two secondary-side connection posts (4) in a single group. A breaking component for device protection before the secondary side of the current transformer is loaded is arranged below the breaking permanent magnet ring (19). A transfer conductive ring (27) is sleeved on the outer side wall of the bottom end of the secondary-side connection post (4), and two adjacent transfer conductive rings (27) are connected through a disassembly protection component.

2. The multi-device circuit connector for primary and secondary load tests according to claim 1, wherein The secondary-side connection socket (1) and the device connection socket (2) are assembled and connected through a plurality of bolt parts (3), and the arrangement positions of the secondary-side connection posts (4) in the secondary-side connection socket (1) correspond one by one to those of the device connection posts (14) in the device connection socket (2).

3. The multi-device circuit connector for primary and secondary load testing according to claim 1, wherein The polarity conversion component includes a calibration power supply ring (7) and a plurality of arc-shaped guide plates (6). The plurality of arc-shaped guide plates (6) are arranged in a circumferential array on the calibration power supply ring (7). The inner end face of the secondary-side connection socket (1) is fixedly connected with 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 respectively, and the calibration 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 pulling and retracting component includes a return spring (10) arranged in the piston sleeve (9). The inner end face of the piston sleeve (9) is slidably connected with the guide post (11) through the return spring (10). The top end of the secondary-side connection post (4) is electrically connected to the guide post (11) through a flexible 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 post (11) is electrically connected to the docking guide plate (12) in the secondary-side connection socket (1), and the device connection post (14) is electrically connected to the docking guide plate (12) in the device connection socket (2). A short-circuiting plate (25) is electrically connected to the side wall of the docking guide plate (12) located in the secondary-side connection socket (1). Matching limit sleeves (13) are fixedly connected to the outer side walls of the two docking guide plates (12) facing each other up and down.

6. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that, The short - circuit component includes a short - circuit repelling magnetic ring (20) and a plurality of short - circuit attracting magnetic columns (21). A recess (15) is commonly connected to the outer side walls of two adjacent piston sleeves (9). An external power supply (16) is fixedly connected to the bottom end of the recess (15). A U - shaped short - circuit rod (24) is fixedly connected to the top end of the recess (15) 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). A plurality of the short - circuit attracting magnetic columns (21) are arranged outside the short - circuit repelling magnetic ring (20). A short - circuit permanent magnetic ring (23) is fixedly connected to the outer side wall of the top end of the telescopic column (22).

7. The multi-device circuit connector for primary and secondary load testing according to claim 6, wherein The open - circuit component includes an open - circuit attracting magnetic ring (17) and a plurality of open - circuit repelling magnetic columns (18). The open - circuit attracting magnetic ring (17) is fixedly connected to the outer side wall of the piston sleeve (9). A plurality of the open - circuit repelling magnetic columns (18) are arranged outside the open - circuit attracting magnetic ring (17). The open - circuit permanent magnetic ring (19) is fixedly connected to the top end of the guide post (11). The external power supply (16) is electrically connected to the short - circuit attracting magnetic columns (21) and the open - circuit repelling magnetic columns (18) respectively.

8. The multi-device circuit connector for primary and secondary load tests according to claim 1, characterized in that, A shielding cover (8) is fixedly connected to the outer side wall of the secondary - side connection post (4). Two symmetrically arranged insulating ceramic plates (32) are rotatably connected to the top end of the shielding cover (8) through a control rotating base (31).

9. The multi-device circuit connector for primary and secondary load testing according to claim 1, characterized in that, The disassembly protection component includes two conductive elastic sheets (28) and two short - circuit semi - circular plates (29). The transfer conductive ring (27) is electrically connected to the short - circuit semi - circular plates (29) through the conductive elastic sheets (28). Both ends of the two short - circuit semi - circular plates (29) are connected through telescopic rods (30). A plurality of trapezoidal columns (26) are fixedly connected to the bottom end of the secondary - side connection seat (1). The trapezoidal columns (26) are arranged between two adjacent transfer conductive rings (27). The two short - circuit semi - circular plates (29) are sleeved on the outer side walls of the trapezoidal columns (26).

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