Open-circuit-prevention locking bolt system with pre-grounding structure

Abstract

The invention relates to the technical field of electric power systems, in particular to an open-circuit-prevention locking bolt system with a pre-grounding structure, a current transformer wiring terminal is provided with a shell, two wire interfaces are arranged in the shell, two movable conductive movable blocks are arranged on the two wire interfaces respectively, and the two conductive movable blocks are arranged in the shell. An elastic reset mechanism is arranged between the conductive movable block and the shell; the conductive sheet is arranged on the shell; the two conductive movable blocks share one conductive sheet, and the two conductive movable blocks and the conductive sheet are kept in contact for electric conduction; two push rods are arranged on the left side of the current transformer wiring terminal; a reset spring mechanism is arranged on the push rod; an insertion end is arranged at the right end of the push rod; an insertion port is formed between the conductive part of the conductive movable block and the wire interface; in this way, when the detection equipment of the current transformer is disassembled, assembled and overhauled, the two wire interfaces can be conducted through the conductive movable block, the two ends of the secondary winding of the current transformer are short-circuited, power failure is not needed for overhauling, and continuous operation of a power system is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, and in particular to an open circuit prevention maintenance terminal for a current transformer. Background Art

[0002] When the current transformer is working, it converts the large current on the primary side into a small current on the secondary side for measurement. The secondary side cannot be open. Since the current transformer has more secondary windings and fewer primary windings, if the secondary side of the current transformer is suddenly opened during circuit operation, a relatively high voltage will be generated at both ends of the disconnection, damaging the equipment or leaving a safety hazard. Therefore, the secondary current loop is prohibited from being open during operation.

[0003] The secondary current loop transmits the low current signal transformed by the current transformer to the measuring instrument, protection relay and automation control equipment. This signal transmission is usually for the purpose of maintaining and monitoring the stability and safety of the system.

[0004] Under the traditional maintenance method, when the detection equipment in the secondary current circuit fails or needs maintenance, it is usually necessary to shut down the power for maintenance, which not only affects the continuous operation of the power system, but also may cause safety hazards and economic losses. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above problems existing in the prior art, the present invention is proposed.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] An anti-open circuit locking pin system with a pre-grounding structure includes a current transformer terminal, two wire interfaces are arranged on the right side of the current transformer terminal, the two wire interfaces are respectively connected to the two ends of the secondary current loop of the current transformer, and a socket is arranged on the left side of the current transformer terminal, and the socket is conductively connected to the wire interface.

[0009] The current transformer terminal block has a housing, and two wire interfaces are arranged in the housing;

[0010] The housing is provided with two conductive movable blocks that move up and down, the two conductive movable blocks are respectively arranged above the two wire interfaces, and an elastic reset mechanism is arranged between the conductive movable blocks and the housing;

[0011] The conductive movable block has a reset state and a raised state;

[0012] The elastic reset mechanism drives the conductive movable block to reset. When the conductive movable block is in the reset state, the conductive part of the conductive movable block contacts the conductive part of the wire interface to conduct electricity.

[0013] It also includes a conductive sheet disposed on the housing, wherein a ground terminal is disposed on the conductive sheet;

[0014] The two conductive movable blocks share a conductive sheet, and the two conductive movable blocks maintain contact with the conductive sheet for electrical conduction;

[0015] When the two conductive movable blocks are in a reset state, the conductive parts on the two conductive movable blocks are also connected to the conductive sheet at the same time, thereby achieving connection between the two wire interfaces;

[0016] When the conductive movable block is in the raised state, the conductive part on the conductive movable block is disconnected from the conductive part of the wire interface, thereby realizing the disconnection of the two wire interfaces;

[0017] Two push rods are arranged on the left side of the current transformer terminal, and the push rods are made of insulating material;

[0018] The push rod is provided with a return spring mechanism;

[0019] The push rod is arranged on the left side of the current transformer terminal, the right end of the push rod extends into the housing, the left end of the push rod extends from the housing, and the direction in which the push rod extends from the housing is consistent with the direction of the socket;

[0020] The two push rods are squeezed, the two push rods are retracted, and the return spring mechanism is in a state of storing force;

[0021] The right ends of the two push rods are provided with insertion ends;

[0022] An insertion interface matching the insertion end is provided between the conductive part of the conductive movable block and the conductive part of the wire interface;

[0023] The left ends of the two push rods are pressed, and the two insertion ends are inserted into the insertion interface, pushing the conductive movable block upward to achieve insulation between the conductive part of the conductive movable block and the conductive part of the wire interface;

[0024] The push rod moves leftwards and the insertion end is pulled out from the plug interface, and the conductive part of the conductive movable block is connected with the conductive part of the wire interface.

[0025] The above design first sets a conductive movable block. When the conductive movable block is in the reset state, the conductive parts on the two conductive movable blocks are also connected to the conductive sheet at the same time, thereby realizing the connection between the two wire interfaces. In this way, when the detection equipment of the current transformer is disassembled, assembled and repaired, the two wire interfaces can be connected through the conductive movable block, and the two ends of the secondary winding of the current transformer can be short-circuited. There is no need to shut down the power for maintenance, thereby ensuring the continuous operation of the power system.

[0026] Secondly, the conductive sheet is provided with a grounding terminal, and the secondary current loop of the current transformer can be grounded. Grounding can prevent the high voltage caused by incorrect open circuit of the secondary side current of the current transformer, thereby improving the safety of the anti-open circuit locking pin system with a pre-grounding structure.

[0027] Then, by setting a push rod, when the current transformer terminal and the detection device terminal are disassembled or installed, when the detection device terminal is inserted into the socket on the left side of the current transformer terminal during installation, the insertion end is inserted into the plug interface, and the insertion end pushes the conductive movable block to move upward, so as to achieve insulation between the conductive part of the conductive movable block and the conductive part of the wire interface; when the detection device terminal is disassembled, the insertion end is pushed out of the plug interface by the elastic force of the reset spring mechanism, and the conductive movable block is automatically reset by the elastic reset mechanism. In this way, when the current transformer detection equipment is disassembled, assembled and overhauled, the two wire interfaces can be automatically connected through the conductive movable block, and the two ends of the secondary winding of the current transformer are automatically short-circuited, so as to avoid the secondary winding inducing extremely high electric damage to the equipment or leaving safety hazards due to workers' operating errors.

[0028] Preferably, a first spring is provided on the conductive movable block as an elastic reset mechanism, one end of the first spring is connected to the conductive movable block, and the other end is connected to the top of the shell; the insertion end of the push rod is inserted into the plug interface of the conductive movable block, the conductive movable block moves up to enter a raised state, the first spring is compressed, and the conductive part of the conductive movable block is insulated from the conductive part of the wire interface; the insertion end of the push rod is withdrawn from under the conductive movable block, the first spring releases the compressed elastic force, the conductive movable block moves down to enter a reset state, the conductive part of the conductive movable block contacts and conducts electricity with the conductive part of the wire interface, and the two wire interfaces of the terminal block of the current transformer are short-circuited; by arranging the first spring as an elastic reset mechanism, the structure is simple and the cost is reduced, and the conductive movable block can be quickly and stably reset to the point where it contacts and conducts electricity with the conductive part of the wire interface when the insertion end of the push rod is pulled out, thereby preventing the secondary coil from inducing a very high induced electromotive force due to unstable contact.

[0029] Preferably, a second spring is provided on the push rod as a reset spring mechanism, one end of the second spring is connected to the push rod, and the other end is connected to the left side of the shell; the second spring is used as a reset spring mechanism to ensure the rapid separation of the current transformer terminal and the detection device terminal, avoiding slow separation during opening, resulting in unstable contact and the occurrence of induced electromotive force.

[0030] Preferably, a passage connecting the inside and outside of the shell is provided on the left side of the shell, and the push rod extends into the shell through the passage; a protrusion structure is provided on the push rod, one end of the second spring is connected to the protrusion structure, and the other end is connected to the outer edge of the passage; a supporting structure for supporting the push rod is also provided on the left side of the shell, the protrusion structure is provided between the supporting structure and the passage, and the left end of the push rod extends out from the left side of the supporting structure; by providing the passage and the supporting structure, the push rod can slide back and forth and remain parallel.

[0031] Furthermore, the upper side of the support structure and the shell form an upward opening structure, which facilitates the detection device terminal to be inserted into the socket and then the detection device terminal and the current transformer terminal to be fixed by using the insertion opening structure.

[0032] Preferably, the insertion end of the push rod is provided with an inclined surface for lifting the conductive movable block; another inclined surface is provided below the conductive movable block as an insertion interface, and the other inclined surface of the conductive movable block is arranged opposite to the inclined surface of the insertion end of the push rod. By providing the inclined surface and the other inclined surface, it is convenient for the insertion end to be inserted into the insertion interface to lift the conductive movable block and keep the conductive part of the wire interface insulated.

[0033] Preferably, a conductive contact piece is provided in the socket, and the conductive contact piece is made of copper; the conductive contact piece is conductively connected to the wire interface; the plug of the detection device terminal is convenient for conductive contact with the conductive contact piece, so that the current transformer terminal is conductively connected with the detection device terminal, facilitating their stable conductive connection.

[0034] Preferably, at least two conductive contact sheets are provided, at least two conductive contact sheets have contraction ends facing each other, and the contraction ends of at least two conductive contact sheets constitute the conductive contacts of the socket; the conductive contact sheet is an elastic conductive contact sheet. The conductive contact sheet has contraction ends facing each other, which ensures that the plug can be smoothly connected and conductive after being inserted into the socket, and prevents poor contact from causing electric sparks to damage the plug or the socket.

[0035] Preferably, the conductive contact sheets are all provided with outward-turned structures facing each other, and the outward-turned structures on at least two conductive contact sheets constitute an open structure, and the open structure is arranged on the left side of the contracted end, and the opening direction of the open structure is consistent with the direction of the socket; the setting of the open structure facilitates the insertion of the conductor on the plug, and then facilitates the insertion of the plug into the socket and maintains conductive contact through the contracted end.

[0036] Preferably, an insertion stop block is also connected to the interior of the shell, and the insertion stop block is located between the retracted end and the wire interface to prevent the plug from being inserted too deeply and damaging the conductive contact piece or the wire interface.

[0037] Preferably, the distance between the insertion limit block and the contraction end on the conductive contact piece is greater than the stroke length of the push rod, ensuring that when the detection device connection terminal is pulled out, the insertion end of the push rod is first pulled out from the plug interface, the conductive movable block falls first, and the conductive part on the conductive movable block is first contacted and connected with the conductive part of the wire interface, short-circuiting the secondary circuit of the current transformer first, and then the plug is separated from the conductive contact piece, ensuring that the secondary circuit of the current transformer will never be open-circuited, ensuring the safety of the anti-open-circuit locking pin system with a pre-grounding structure when in use.

[0038] Preferably, the conductive contact piece is an elastic conductive contact piece, and the elastically contracted position of the conductive contact piece is the contact position between the plug and the conductive contact piece; the conductive contact piece is elastic, ensuring stable conductive contact connection between the plug and the conductive contact piece.

[0039] Preferably, the conductor pin is configured as a cylindrical cone, which facilitates insertion into the conductive contact sheet of the conductor pin and achieves close contact.

[0040] Preferably, a limit ear is provided on the conductive movable block, and the limit ear limits the lowest falling position of the conductive movable block, and the limit ear is located outside the shell; a limit block is also provided on the conductive movable block, and the limit block is located inside the current transformer terminal, and the limit block is at the highest rising position of the conductive movable block; the upper and lower limit positions of the conductive movable block are limited to prevent the conductive movable block from falling off or compressing and deforming the conductive part of the wire interface, thereby ensuring the stability of the operation of the anti-open circuit locking pin system with a pre-grounding structure after multiple overhauls.

[0041] Preferably, a rotating plug block is provided above the detection device terminal, and the rotating plug block and the detection device terminal can be rotatably matched; a card slot is provided on the shell; the rotating plug block and the card slot serve as a locking mechanism; the rotating plug block is inserted into the card slot to fix the current transformer terminal and the detection device terminal in connection; the rotating plug block is disengaged from the card slot, and the push rod pushes the detection device terminal away from the fixed current transformer terminal; the insertion of the rotating plug block into the card slot facilitates the rapid and stable locking of the detection device terminal and the fixed current transformer terminal, and the rotating plug block is disengaged from the card slot to facilitate the separation of the detection device terminal and the fixed current transformer terminal, and the locking pin mechanism on the push rod ensures the rapid disengagement of the detection device terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0043] Figure 1 It is a schematic diagram of the overall structure of the anti-open circuit locking pin system with a pre-grounding structure of the present invention;

[0044] Figure 2 It is a schematic diagram of the structure of the push rod of the present invention falling without being inserted into the conductive movable block;

[0045] Figure 3 It is a schematic diagram of the structure in which the push rod of the present invention is inserted into the conductive movable block and raised. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0049] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] Example 1

[0051] refer to Figure 1-Figure 3, an anti-open circuit locking pin system with a pre-grounding structure includes a current transformer terminal 1, two wire interfaces 11 are arranged on the right side of the current transformer terminal 1, and the two wire interfaces 11 are respectively connected to the two ends of the secondary current loop of the current transformer, and a socket 12 is arranged on the left side of the current transformer terminal 1, and the socket 12 is conductively connected to the wire interface 11.

[0052] The current transformer terminal block 1 has a housing 13, and two wire interfaces 11 are arranged in the housing 13;

[0053] The housing 13 is provided with two conductive movable blocks 14 that move up and down. The two conductive movable blocks 14 are respectively arranged above the two wire interfaces 11. An elastic reset mechanism is arranged between the conductive movable blocks 14 and the housing 13.

[0054] The conductive movable block 14 has a reset state and a raised state;

[0055] The elastic reset mechanism drives the conductive movable block 14 to reset. When the conductive movable block 14 is in the reset state, the conductive part of the conductive movable block 14 contacts the conductive part of the wire interface 11 for conduction.

[0056] It also includes a conductive sheet 15 disposed on the housing 13, and a ground terminal is disposed on the conductive sheet 15;

[0057] The two conductive movable blocks 14 share a conductive sheet 15, and the two conductive movable blocks 14 and the conductive sheet 15 maintain contact and conduction;

[0058] When the two conductive movable blocks 14 are in the reset state, the conductive parts on the two conductive movable blocks 14 are also connected to the conductive sheet 15 at the same time, thereby achieving the connection between the two wire interfaces 11;

[0059] When the conductive movable block 14 is in the raised state, the conductive part of the conductive movable block 14 is disconnected from the conductive part of the wire interface 11, thereby realizing the disconnection of the two wire interfaces 11;

[0060] Two push rods 16 are arranged on the left side of the current transformer terminal 1, and the push rods 16 are made of insulating material;

[0061] The push rod 16 is provided with a return spring mechanism;

[0062] The push rod 16 is arranged on the left side of the current transformer terminal 1, the right end of the push rod 16 extends into the housing 13, the left end of the push rod 16 extends from the housing 13, and the direction in which the push rod 16 extends from the housing 13 is consistent with the direction of the socket 12;

[0063] The two push rods 16 are squeezed, the two push rods 16 are retracted, and the return spring mechanism is in a power storage state;

[0064] The right ends of the two push rods 16 are provided with insertion ends 161;

[0065] An insertion interface matching the insertion end 161 is provided between the conductive portion of the conductive movable block 14 and the conductive portion of the wire interface 11;

[0066] The left ends of the two push rods 16 are pressed, and the two insertion ends 161 are inserted into the insertion interface, pushing the conductive movable block 14 upward, so as to achieve insulation between the conductive part of the conductive movable block 14 and the conductive part of the wire interface 11;

[0067] The push rod 16 moves leftward and the insertion end 161 is pulled out from the plug interface, and the conductive part of the conductive movable block 14 is connected with the conductive part of the wire interface 11.

[0068] The above design first sets a conductive movable block 14. When the conductive movable block 14 is in the reset state, the conductive parts on the two conductive movable blocks 14 are also connected to the conductive sheet 15 at the same time, thereby realizing the connection between the two wire interfaces 11. In this way, when the detection equipment of the current transformer is disassembled, assembled, and repaired, the two wire interfaces 11 can be connected through the conductive movable block 14, and the two ends of the secondary winding of the current transformer can be short-circuited. There is no need to shut down the power for maintenance, thereby ensuring the continuous operation of the power system.

[0069] Secondly, the conductive sheet 15 is provided with a grounding terminal, and the secondary current loop of the current transformer can be grounded. Grounding can prevent the high voltage caused by incorrect open circuit of the secondary side current of the current transformer, thereby improving the safety of the anti-open circuit locking pin system with a pre-grounding structure.

[0070] Then, by setting the push rod 16, when the current transformer terminal 1 and the detection device terminal are disassembled or installed, when the detection device terminal is inserted into the socket 12 on the left side of the current transformer terminal 1 during installation, the insertion end 161 is inserted into the plug interface, and the insertion end 161 pushes the conductive movable block 14 to move upward, so as to achieve insulation between the conductive part of the conductive movable block 14 and the conductive part of the wire interface 11; when the detection device terminal is disassembled, the insertion end 161 is pushed out of the plug interface by the elastic force of the reset spring mechanism, and the conductive movable block 14 is automatically reset by the elastic reset mechanism. In this way, when the current transformer detection equipment is disassembled, assembled and repaired, the two wire interfaces 11 can be automatically connected through the conductive movable block 14, and the two ends of the secondary winding of the current transformer are automatically short-circuited, so as to avoid the secondary winding inducing extremely high electric damage to the equipment or leaving safety hazards due to workers' operating errors.

[0071] The conductive movable block 14 is provided with a first spring as an elastic reset mechanism, one end of the first spring is connected to the conductive movable block 14, and the other end is connected to the top of the shell 13; the insertion end 161 of the push rod 16 is inserted into the plug interface of the conductive movable block 14, the conductive movable block 14 moves up to enter the raised state, the first spring is compressed, and the conductive part of the conductive movable block 14 is insulated from the conductive part of the wire interface 11; the insertion end 161 of the push rod 16 is withdrawn from the bottom of the conductive movable block 14, the first spring releases the compressed elastic force, the conductive movable block 14 moves down to enter the reset state, the conductive part of the conductive movable block 14 contacts the conductive part of the wire interface 11 for conduction, and the two wire interfaces 11 of the terminal block of the current transformer are short-circuited; by providing the first spring as an elastic reset mechanism, the structure is simple and the cost is reduced, and the conductive movable block 14 can be quickly and stably reset to the point where it contacts the conductive part of the wire interface 11 for conduction when the insertion end 161 of the push rod 16 is pulled out, thereby preventing the secondary coil from inducing a high induced electromotive force due to unstable contact.

[0072] The push rod 16 is provided with a second spring 17 as a reset spring mechanism, one end of the second spring 17 is connected to the push rod 16, and the other end is connected to the left side of the housing 13; the second spring 17 is used as a reset spring mechanism to ensure the rapid separation of the current transformer terminal 1 and the detection device terminal, avoiding slow separation during opening, resulting in unstable contact and the occurrence of induced electromotive force.

[0073] The left side of the shell 13 is provided with a passage connecting the inside and outside of the shell 13, and the push rod 16 extends into the shell 13 through the passage; the push rod 16 is provided with a protrusion structure, one end of the second spring 17 is connected to the protrusion structure, and the other end is connected to the outer edge of the passage; the left side of the shell 13 is also provided with a support structure 110 for supporting the push rod 16, the protrusion structure is arranged between the support structure 110 and the passage, and the left end of the push rod 16 extends out from the left side of the support structure 110; the passage and the support structure 110 are provided to facilitate the push rod 16 to slide back and forth and maintain parallelism.

[0074] The upper side of the support structure 110 and the housing 13 form an upward opening structure, which facilitates the detection device terminal to be inserted into the socket 12 and then fixed to the current transformer terminal 1 by using the insertion opening structure.

[0075] Preferably, the insertion end 161 of the push rod 16 is provided with an inclined surface for lifting the conductive movable block 14; another inclined surface is provided below the conductive movable block 14 as an insertion interface, and the other inclined surface of the conductive movable block 14 is arranged opposite to the inclined surface of the insertion end 161 of the push rod 16. By providing the inclined surface and the other inclined surface, it is convenient for the insertion end 161 to be inserted into the insertion interface to lift the conductive movable block 14 and keep it insulated from the conductive part of the wire interface 11.

[0076] During use, when the current transformer needs to remove the detection device for inspection or replacement, the locking mechanism is unlocked, the compression elastic force of the second spring 17 pushes out the push rod 16, the push rod 16 pushes out the detection device terminal, and the insertion end 161 of the push rod 16 is pulled out from the plug interface, and the elastic reset mechanism drives the conductive movable block 14 to reset. When the conductive movable block 14 is in the reset state, the conductive part of the conductive movable block 14 contacts the conductive part of the wire interface 11 to complete the conduction. The two conductive movable blocks 14 maintain contact and conduction with the conductive sheet 15, and the secondary winding of the current transformer is short-circuited. Then the current transformer terminal 1 and the detection device terminal are separated, and there is no need to shut down the power for maintenance, thereby ensuring the continuous operation of the power system. The length of the plug inserted into the conductive contact sheet 18 is greater than the length of the insertion end 161 of the push rod 16 extending into the plug interface below the conductive movable block 14, thereby ensuring the safety of the anti-open circuit locking pin system with a pre-grounding structure during use.

[0077] When the detection device is reinstalled into the current transformer, the plug is inserted into the conductive contact sheet 18 and the detection device is connected to the current transformer. The conductive movable block 14 and the conductive sheet 15 are in conductive contact with the conductive part of the wire interface 11 to maintain a short circuit. Then the push rod 16 is pushed and retracted by the detection device terminal. The two insertion ends 161 are inserted into the plug interface to push the conductive movable block 14 upward to achieve insulation between the conductive part of the conductive movable block 14 and the conductive part of the wire interface 11. Now the detection device is reconnected and the conductive movable block 14 is disconnected to prevent the open circuit effect.

[0078] Example 2

[0079] refer to Figure 1 and Figure 2 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0080] The socket 12 is provided with a conductive contact piece 18, and the conductive contact piece 18 is made of copper. The conductive contact piece 18 is conductively connected to the wire interface 11, which facilitates the conductive contact between the plug of the detection device terminal and the conductive contact piece 18, so that the current transformer terminal 1 is conductively connected to the detection device terminal, facilitating its stable conductive connection.

[0081] At least two conductive contact pieces 18 are provided, and at least two conductive contact pieces 18 have contraction ends facing each other, and the contraction ends of at least two conductive contact pieces 18 constitute conductive contacts of the socket 12; the conductive contact piece 18 is an elastic conductive contact piece 18. The conductive contact piece 18 has contraction ends facing each other, which ensures that the plug can be smoothly connected to the socket 12 for conduction, and prevents poor contact from causing electric sparks to damage the plug or the socket 12.

[0082] The conductive contact pieces 18 are all provided with outward-turned structures facing each other, and the outward-turned structures on at least two conductive contact pieces 18 constitute an open structure, and the open structure is arranged on the left side of the contracted end, and the opening direction of the open structure is consistent with the orientation of the socket 12; the setting of the open structure facilitates the insertion of the conductor on the plug, and then facilitates the insertion of the plug into the socket 12 and maintains conductive contact through the contracted end.

[0083] The housing 13 is also provided with an insertion stop block 19 disposed inside. The insertion stop block 19 is located between the retracted end and the wire interface 11 to prevent the plug from being inserted too deeply and damaging the conductive contact piece 18 or the wire interface 11 .

[0084] The distance between the insertion limit block 19 and the contraction end of the conductive contact piece 18 is greater than the stroke length of the push rod 16, ensuring that when the detection device connection terminal is pulled out, the insertion end 161 of the push rod 16 is first pulled out from the plug interface, the conductive movable block 14 falls first, and the conductive part of the conductive movable block 14 is first contacted and connected with the conductive part of the wire interface 11, so as to short-circuit the secondary circuit of the current transformer first, and then separate the plug from the conductive contact piece 18, so as to ensure that the secondary circuit of the current transformer will never be open-circuited, thereby ensuring the safety of the anti-open-circuit locking pin system with a pre-grounding structure when in use.

[0085] The conductive contact piece 18 is an elastic conductive contact piece 18 , and the elastically contracted position of the conductive contact piece 18 is the contact position between the plug and the conductive contact piece 18 ; the conductive contact piece 18 is elastic, ensuring a stable conductive contact connection between the plug and the conductive contact piece 18 .

[0086] The conductor pin is configured in a cylindrical cone shape, which facilitates insertion into the conductive contact piece 18 of the conductor pin and achieves close contact.

[0087] The conductive movable block 14 is provided with a limit ear, and the limit ear limits the lowest falling position of the conductive movable block 14, and the limit ear is located outside the shell 13; the conductive movable block 14 is also provided with a limit block, and the limit block is located inside the current transformer terminal 1, and the limit block is at the highest rising position of the conductive movable block 14; the upper and lower limit positions of the conductive movable block 14 are limited to prevent the conductive movable block 14 from falling off or compressing and deforming the conductive part of the wire interface 11, thereby ensuring the stability of the anti-open circuit locking pin system with a pre-grounding structure after multiple overhauls.

[0088] A rotating plug is provided above the detection device terminal, and the rotating plug can be rotatably matched with the detection device terminal; a card slot is provided on the shell 13; the rotating plug and the card slot serve as a locking mechanism; the rotating plug is inserted into the card slot, and the current transformer terminal 1 is fixedly connected with the detection device terminal; the rotating plug is disengaged from the card slot, and the push rod 16 pushes the detection device terminal to separate from the solid current transformer terminal 1; the rotating plug is inserted into the card slot to facilitate the rapid and stable locking of the detection device terminal and the solid current transformer terminal 1, and the rotating plug is disengaged from the card slot, which facilitates the separation of the detection device terminal and the solid current transformer terminal 1, and the locking pin mechanism on the push rod 16 ensures the rapid separation of the detection device terminal.

[0089] When in use, the conductive movable block 14 slides up and down through the stop ears and the stop blocks to prevent the conductive movable block 14 from falling off or deforming the conductive part of the wire interface 11. The rotating plug block is inserted into the card slot to facilitate the fast and stable locking of the detection device terminal and the solid current transformer terminal 1. The rotating plug block is disengaged from the card slot to facilitate the separation of the detection device terminal and the solid current transformer terminal 1. The reset spring mechanism on the push rod 16 ensures that the detection device terminal is quickly disengaged. When the plug is inserted, the conductor in the plug will open the two conductive contact pieces 18 from the top of the opening structure through the contraction ends of the two conductive contact pieces 18 to form a conductive contact to maintain conductive contact. The conductive contact piece 18 relies on elasticity to press on the conductor of the plug to ensure the stability of the conductive connection and prevent the generation of electric sparks.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An anti-open circuit locking pin system with a pre-grounding structure, comprising a current transformer terminal, two wire interfaces are arranged on the right side of the current transformer terminal, the two wire interfaces are respectively connected to the two ends of the secondary current loop of the current transformer, and a socket is arranged on the left side of the current transformer terminal, the socket is conductively connected to the wire interface, and is characterized in that: The current transformer terminal block has a housing, and two wire interfaces are arranged in the housing; The housing is provided with two conductive movable blocks that move up and down, the two conductive movable blocks are respectively arranged above the two wire interfaces, and an elastic reset mechanism is arranged between the conductive movable blocks and the housing; The conductive movable block has a reset state and a raised state; The elastic reset mechanism drives the conductive movable block to reset. When the conductive movable block is in the reset state, the conductive part of the conductive movable block contacts the conductive part of the wire interface to conduct electricity. It also includes a conductive sheet disposed on the housing, wherein a ground terminal is disposed on the conductive sheet; The two conductive movable blocks share a conductive sheet, and the two conductive movable blocks maintain contact with the conductive sheet for electrical conduction; When the two conductive movable blocks are in a reset state, the conductive parts on the two conductive movable blocks are also connected to the conductive sheet at the same time, thereby achieving connection between the two wire interfaces; When the conductive movable block is in the raised state, the conductive part on the conductive movable block is disconnected from the conductive part of the wire interface, thereby realizing the disconnection of the two wire interfaces; Two push rods are arranged on the left side of the current transformer terminal, and the push rods are made of insulating material; The push rod is provided with a return spring mechanism; The push rod is arranged on the left side of the current transformer terminal, the right end of the push rod extends into the housing, the left end of the push rod extends from the housing, and the direction in which the push rod extends from the housing is consistent with the direction of the socket; The two push rods are squeezed, the two push rods are retracted, and the return spring mechanism is in a state of storing force; The right ends of the two push rods are provided with insertion ends; An insertion interface matching the insertion end is provided between the conductive part of the conductive movable block and the conductive part of the wire interface; The left ends of the two push rods are pressed, and the two insertion ends are inserted into the insertion interface, pushing the conductive movable block upward to achieve insulation between the conductive part of the conductive movable block and the conductive part of the wire interface; The push rod moves leftwards and the insertion end is pulled out from the plug interface, and the conductive part of the conductive movable block is connected with the conductive part of the wire interface.

2. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 1, characterized in that: The conductive movable block is provided with a first spring as an elastic reset mechanism, one end of the first spring is connected to the conductive movable block, and the other end is connected to the upper part of the housing; The insertion end of the push rod is inserted into the insertion interface of the conductive movable block, the conductive movable block moves upward to enter a raised state, the first spring is compressed, and the conductive part of the conductive movable block is insulated from the conductive part of the wire interface; The insertion end of the push rod is pulled out from under the conductive movable block, the first spring releases the compressed elastic force, the conductive movable block moves down and enters a reset state, the conductive part of the conductive movable block contacts and conducts electricity with the conductive part of the wire interface, and the two wire interfaces of the terminal block of the current transformer are short-circuited.

3. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 1, characterized in that: The push rod is provided with a second spring as a reset spring mechanism, one end of the second spring is connected to the push rod, and the other end is connected to the left side of the shell.

4. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 2, characterized in that: The left side of the shell is provided with a port connecting the inside and outside of the shell, and the push rod extends into the shell through the port; The push rod is provided with a protruding structure, one end of the second spring is connected to the protruding structure, and the other end is connected to the outer edge of the opening; A supporting structure for supporting the push rod is also provided on the left side of the shell, the protruding structure is provided between the supporting structure and the opening, and the left end of the push rod extends out from the left side of the supporting structure.

5. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 1, characterized in that: The insertion end of the push rod is provided with an inclined surface for lifting the conductive movable block; Another inclined surface is arranged below the conductive movable block as an insertion interface, and the other inclined surface of the conductive movable block is arranged opposite to the inclined surface of the insertion end of the push rod.

6. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 1, characterized in that: The socket is provided with a conductive contact sheet, and the conductive contact sheet is made of copper; The conductive contact piece is conductively connected to the wire interface.

7. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 6, characterized in that: At least two conductive contact sheets are provided, the conductive contact sheets have contraction ends facing each other, and the contraction ends on at least two conductive contact sheets constitute conductive contacts of the socket; The conductive contact piece is an elastic conductive contact piece.

8. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 7, characterized in that: The conductive contact sheets are all provided with outward-turned structures facing each other, and the outward-turned structures on at least two conductive contact sheets constitute an opening structure, which is arranged on the left side of the contraction end, and the opening direction of the opening structure is consistent with the direction of the socket.

9. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 7, characterized in that: An insertion stop block is also connected to the interior of the shell, and the insertion stop block is located between the contraction end and the wire interface.

10. The anti-open circuit locking bolt system with a pre-grounding structure according to claim 9, characterized in that: The distance between the insertion limit block and the contraction end of the conductive contact piece is greater than the stroke length of the push rod.

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