Three-phase mutual inductor type electric energy meter connector and use method

Abstract

The invention discloses a three-phase mutual inductor type electric energy meter connector and a using method, and relates to the technical field of electric energy meter connectors, the connector comprises a cuboid shell, three-phase binding post grooves are sequentially formed in the shell, each phase binding post groove comprises two current binding post grooves which are isolated from each other, and the current binding post grooves are formed in the shell. Incoming and outgoing line current binding posts are correspondingly mounted in the two current binding post grooves; each current binding post comprises a plug-in conductive post, a bump and a wire fixing groove from top to bottom, and a short-circuit groove is formed in the front surface of each bump; a short-circuit mechanism is arranged on the front face of the shell and comprises a short-circuit rod, three short-circuit pieces corresponding to an A phase, a B phase and a C phase are sequentially embedded in the short-circuit rod, each short-circuit piece can be correspondingly inserted into a short-circuit groove of a three-phase incoming and outgoing line current binding post, the incoming and outgoing line current binding post of each phase is short-circuited, and therefore power-off-free electric energy meter replacement for high-voltage users is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electricity meter connectors, and particularly to a three-phase transformer-type electricity meter connector and a usage method thereof. Background Art

[0002] The electricity meter connector is used to achieve the electrical connection between the electricity meter and the voltage and current circuits, and can quickly complete the installation and removal of the electricity meter by plugging and unplugging. Its advantages are high efficiency, safety and no wrong wiring problems. Similarly, the electricity metering junction box can also achieve the electrical connection between the electricity meter and the voltage and current circuits, but its wiring is cumbersome and prone to wrong wiring or metering device failure problems. Currently, most high-voltage power users use three-phase transformer-type electricity meters to measure electricity. However, the installation and removal of this electricity meter still use the electricity metering junction box and do not use the electricity meter connector. The main reasons are as follows:

[0003] (1) Three-phase transformer-type electricity meters are usually used by high-voltage users, and the replacement of high-voltage user electricity meters is usually carried out without power interruption. However, the existing three-phase transformer-type electricity meter connectors themselves cannot achieve the function of replacing the meter without power interruption. To solve the problem that the existing connectors cannot achieve the function of replacing the meter without power interruption, currently, the method of installing an electricity metering junction box is often adopted, that is, the secondary line of the transformer is first connected to the electricity metering junction box, and then connected to the connector from the junction box, and the function of replacing the meter without power interruption is achieved through the connection piece of the junction box. Although this method realizes the function of replacing the meter without power interruption, the overall structure is complex, and the increase in the nodes of the voltage and current circuits is also prone to metering device failure or wrong wiring, with a high installation risk, and at the same time increases the installation cost.

[0004] (2) The existing electricity meter connectors are usually designed for low-voltage users and are installed in the low-voltage metering box; while the three-phase transformer-type electricity meters used by high-voltage users are installed in the metering cabinet of the box transformer or the power distribution room. At present, there is no electricity meter connector specifically designed for high-voltage users and applied in the metering cabinet.

[0005] That is, for the installation and replacement of three-phase transformer-type electricity meters for high-voltage users, especially the live installation and replacement, the risk is relatively high. The staff faces risks such as electric shock and high fall. At present, there is no electricity meter connector specifically suitable for high-voltage users, and the existing installation method through the electricity metering junction box is also difficult to meet the on-site safety control requirements, and the entire installation process is complex and the installation cost is high. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention proposes a three-phase current transformer type watt-hour meter connector and its usage method. By using this watt-hour meter connector, the power-off replacement of high-voltage user watt-hour meters can be realized, which can effectively simplify the installation process of watt-hour meters, shorten the operation time, greatly reduce the personal risks of on-site operators, relieve the work pressure of operators, and reduce the installation cost.

[0007] To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:

[0008] The first aspect of the present invention provides a three-phase current transformer type watt-hour meter connector.

[0009] A three-phase current transformer type watt-hour meter connector includes a cuboid housing. Three-phase terminal post slots are successively opened on the housing. Each phase terminal post slot includes two mutually isolated current terminal post slots, and incoming and outgoing line current terminal posts are correspondingly installed in the two current terminal post slots.

[0010] The current terminal post includes an insertion conductive post, a convex block, and a wire fixing groove from top to bottom. A short-circuit groove is provided on the front surface of the convex block.

[0011] A short-circuit mechanism is provided on the front surface of the housing. The short-circuit mechanism includes a short-circuit rod. Three short-circuit pieces corresponding to phases A, B, and C are successively embedded on the short-circuit rod. Each short-circuit piece can be respectively inserted into the short-circuit grooves of the three-phase incoming and outgoing line current terminal posts to short-circuit the incoming and outgoing line current terminal posts of each phase.

[0012] In a further technical solution, two mutually isolated neutral line terminal post slots are also opened on the housing, and the neutral line terminal post slots are used to install neutral line terminal posts.

[0013] Each phase terminal post slot further includes a voltage terminal post slot isolated from the current terminal post slot, and the voltage terminal post slot is used to install voltage terminal posts.

[0014] In a further technical solution, the arrangement order of all terminal posts is the same as that of the watt-hour meter terminal posts. The arrangement order of all terminal posts is: phase A incoming line current terminal post - phase A voltage terminal post - phase A outgoing line current terminal post - phase B incoming line current terminal post - phase B voltage terminal post - phase B outgoing line current terminal post - phase C incoming line current terminal post - phase C voltage terminal post - phase C outgoing line current terminal post - neutral line terminal post - neutral line terminal post.

[0015] In a further technical solution, the voltage terminal post and the neutral line terminal post have the same structure, including an insertion conductive post and a wire fixing groove from top to bottom.

[0016] For any terminal, the plug-in conductive post is used for corresponding insertion and extraction of the watt-hour meter. A plurality of threaded holes are provided on the front surface of the wire fixing groove. The wire penetrates into the wire fixing groove and is fixed through the threaded holes and screws.

[0017] In a further technical solution, a limiting wiring hole is provided on the bottom surface of each terminal groove. After the head of the wire is peeled, it is inserted into the limiting wiring hole and then penetrates into the wire fixing groove of the corresponding terminal.

[0018] In a further technical solution, the short-circuiting piece is a metal conductor piece. The size of the short-circuiting piece matches the size of the short-circuiting groove of each phase's incoming and outgoing line current terminals, that is, the thickness of the short-circuiting piece is the same as the height of the short-circuiting groove, the width of the short-circuiting piece is the same as the depth of the short-circuiting groove, and the length of the short-circuiting piece is the same as the distance between the two ends of each phase's two current terminals.

[0019] In a further technical solution, the short-circuiting mechanism further includes symmetric rectangular tracks protruding from both sides of the front surface of the housing. Both sides of the short-circuiting rod are installed in the symmetric tracks;

[0020] The short-circuiting rod is a cuboid-shaped strip structure made of insulating material, and protruding handles are fixedly provided at both ends of the short-circuiting rod. The handles are used to make the short-circuiting rod stuck between the symmetric tracks and for pushing the short-circuiting rod.

[0021] In a further technical solution, a first groove is provided on the front side of the track. The width of the first groove is the same as the width of the rear side of the short-circuiting rod, and is used to hold the short-circuiting rod;

[0022] A second groove is provided at the middle position of the track. The width of the second groove is the same as the width of the handles on both sides of the short-circuiting rod, and is used to install the short-circuiting rod;

[0023] A third groove is provided on the rear side of the front surface of the track. The width of the third groove is the same as the thickness of the short-circuiting piece, and is used for embedding the short-circuiting piece.

[0024] In a further technical solution, a watch hanging post is provided above the housing. A protrusion matching the watch hanging part of the watt-hour meter is provided on the watch hanging post. The protrusion is used to fix the watt-hour meter; A screw fixing hole is also provided on the watch hanging post, and the watt-hour meter connector is further fixed through the screw fixing hole.

[0025] In the second aspect of the present invention, a usage method of a three-phase transformer-type watt-hour meter connector is provided, which is implemented by using the three-phase transformer-type watt-hour meter connector described in the first aspect, and includes the following steps:

[0026] Push the short - circuit bar in the connector towards the terminal post by holding the handles at both ends of the short - circuit bar, so that the three short - circuit pieces on the short - circuit bar are completely inserted into the short - circuit slots of the incoming and outgoing line current terminal posts of the three - phase. At this time, the three - phase current of the watt - hour meter is short - circuited, and the watt - hour meter can be replaced without power outage.

[0027] When replacing the watt - hour meter, pull out the original watt - hour meter upwards until it is completely separated from the connector. Then, align each wiring hole of the watt - hour meter to be replaced with each terminal post of the connector one by one, and insert the watt - hour meter onto the connector. After complete insertion, the hanging part of the watt - hour meter will just be stuck on the protrusion of the meter - hanging post of the connector.

[0028] After the replacement is completed, push the short - circuit bar in the connector in the direction away from the terminal post, so that the short - circuit pieces on the short - circuit bar completely leave the short - circuit slot and the short - circuit bar is completely stuck in the first groove of the track. At this time, the watt - hour meter resumes normal metering.

[0029] The above - mentioned one or more technical solutions have the following beneficial effects:

[0030] 1. The present invention proposes a connector for a three - phase transformer - type watt - hour meter and its usage method. By designing the current terminal post structure and the short - circuit structure of the connector, the two cooperate to enable the connector for the three - phase transformer - type watt - hour meter itself to achieve the function of replacing the meter without power outage. High - voltage users use this connector for installing and removing the watt - hour meter, without the need to install a wiring box, greatly improving the work efficiency of installing and removing the watt - hour meter, reducing the probability of incorrect wiring, especially reducing the personal risks such as electric shock and voltage transformer short - circuit faced by on - site workers in the high - voltage user's live distribution room or box substation, reducing the work pressure of the operators, effectively simplifying the watt - hour meter installation process, shortening the operation time, reducing the installation cost, and this connector can be completely installed inside the watt - hour meter cover without separate sealing.

[0031] 2. The existing method of using an electric energy metering wiring box to replace the meter takes more than ten minutes, and the user's electricity consumption will not be metered during the meter replacement. Compared with the existing method, using the connector for the three - phase transformer - type watt - hour meter proposed by the present invention to achieve power - off - free meter replacement for high - voltage users, the entire power - off - free meter replacement process can be completed within dozens of seconds, and its power - off - free meter replacement efficiency, safety, etc. are higher; in addition, currently high - voltage users all use electric energy metering wiring boxes to install watt - hour meters. If the connector proposed by the present invention is used for power - off - free installation and replacement of the meter, it can save hundreds of millions of yuan in electricity charges for the power supply company during meter replacement, greatly reducing the installation cost and achieving better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The schematic drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0033] Figure 1 Schematic structural diagram of the connector for a three-phase current transformer type watt-hour meter according to Embodiment 1 of the present invention;

[0034] Figure 2 Schematic structural diagram of the current terminal in the connector according to Embodiment 1 of the present invention;

[0035] Figure 3 Schematic structural diagram of the voltage terminal in the connector according to Embodiment 1 of the present invention;

[0036] Figure 4 Schematic structural diagram of the short-circuit mechanism in the connector according to Embodiment 1 of the present invention;

[0037] Figure 5 Top view of the short-circuit mechanism in the connector according to Embodiment 1 of the present invention.

[0038] Wherein, 1, housing; 2, current terminal; 3, voltage terminal; 4, neutral terminal; 5, terminal slot; 6, connection hole; 7, plug conductive post; 8, convex block; 9, wire fixing groove; 10, short-circuit slot for current terminal; 11, short-circuit mechanism; 12, short-circuit bar; 13, short-circuit piece; 14, track; 15, first groove; 16, second groove; 17, third groove; 18, meter hanging post; 19, protrusion; 20, screw fixing hole. Detailed implementation manners

[0039] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further descriptions of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly specified in the context, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Embodiment 1

[0042] This embodiment provides a connector for a three-phase current transformer type watt-hour meter, as Figure 1As shown in the figure, it includes a cuboid housing 1. On this housing 1, three-phase terminal slots 5 are successively opened. Each phase terminal slot 5 includes two mutually isolated current terminal slots and a voltage terminal slot isolated from the current terminal slots. In the two current terminal slots, incoming and outgoing line current terminals 2 are correspondingly installed. In the voltage terminal slot, a voltage terminal 3 is correspondingly installed. And on the housing, two mutually isolated neutral terminal slots are also opened. In the neutral terminal slots, neutral terminals 4 are installed.

[0043] Furthermore, the arrangement order of all terminals and the terminals of the electricity meter is the same. The arrangement order of all terminals is: A-phase incoming line current terminal - A-phase voltage terminal - A-phase outgoing line current terminal - B-phase incoming line current terminal - B-phase voltage terminal - B-phase outgoing line current terminal - C-phase incoming line current terminal - C-phase voltage terminal - C-phase outgoing line current terminal - neutral terminal - neutral terminal.

[0044] As Figure 2 shown in the figure, the current terminal 2 includes three parts: a plug-in conductive post 7, a convex block 8, and a wire fixing groove 9 from top to bottom. Among them, the plug-in conductive post 7 is used for the corresponding insertion and extraction of the electricity meter; on the front of the cuboid convex block 8, a short-circuit groove (i.e., the current terminal short-circuit groove 10) is opened, which is used to realize the function of changing the meter without power interruption; inside the lower part of the current terminal 2, there is a wire fixing groove 9, and a wiring hole 6 is opened on the bottom surface of this wire fixing groove 9, which is convenient for the penetration of the wire. On the front of this wire fixing groove 9, a plurality of threaded holes are opened. In this embodiment, specifically two threaded holes are opened, and the secondary current wire of the current transformer is fixed through these threaded holes and screws.

[0045] As Figure 3 shown in the figure, the voltage terminal 3 and the neutral terminal 4 have the same structure. The voltage terminal includes a plug-in conductive post 7 and a wire fixing groove 9 from top to bottom. Among them, the plug-in conductive post 7 is used for the corresponding insertion and extraction of the electricity meter; inside the lower part of the voltage terminal 3, there is a wire fixing groove 9, and a wiring hole 6 is opened on the bottom surface of this wire fixing groove 9, which is convenient for the penetration of the wire. On the front of this wire fixing groove 9, a plurality of threaded holes are opened. In this embodiment, specifically two threaded holes are opened, and the secondary voltage wire of the current transformer and the connection line between the electricity meter and the terminal are fixed through these threaded holes and screws.

[0046] Preferably, the current terminal, the voltage terminal, and the neutral terminal all adopt an interference fit design. After being inserted into the electricity meter and the terminal, there is no need to tighten the screws, which is convenient for installation and disassembly.

[0047] In addition, directly above each terminal slot 5 is a through hole leading to the top of the housing, and a rectangular limiting connection hole is provided below. The width of the limiting connection hole is designed such that unpeeled current-carrying wires and voltage wires cannot pass through the limiting connection hole, thereby preventing the situation of wire skin being pressed. Specifically, the width of the limiting connection hole corresponding to the voltage terminal is the same as the diameter of a 2.5-square copper wire with insulation, and the width of the limiting connection hole corresponding to the current terminal is the same as the diameter of a 4-square copper wire with insulation. Based on the above design, each terminal is inserted into the housing from the opening of the terminal slot above. After the head of the wire is peeled, it is inserted into the limiting connection hole, and then passes through the connection hole 6 at the bottom of the terminal into the wire fixing groove 9. Then, the wire is fixed in the wire fixing groove 9 through a threaded hole and a screw.

[0048] Aiming at the problem that the existing plug-in connectors cannot achieve the function of replacing the meter without power interruption, the three-phase current-transformer type energy meter plug-in connector proposed in this embodiment is specifically designed with a short-circuiting mechanism 11, that is, the plug-in connector itself can short-circuit the two current terminals (i.e., the incoming and outgoing current terminals) of each phase, thereby achieving the function of replacing the meter without power interruption. As Figure 4 and Figure 5 shown, on the front of the plug-in connector housing is provided a short-circuiting mechanism 11, which includes symmetric rectangular tracks 14 protruding from both sides of the front of the housing and a short-circuiting bar 12. The two sides of the short-circuiting bar 12 are installed in the symmetric tracks. Three short-circuiting pieces 13 are sequentially embedded on the short-circuiting bar 12, corresponding to the two current terminals of phases A, B, and C respectively. Each short-circuiting piece 13 can be respectively inserted into the short-circuiting slots of the incoming and outgoing current terminals of phases A, B, and C to short-circuit the incoming and outgoing current terminals of each phase, thereby achieving the function of replacing the meter without power interruption.

[0049] Specifically, the above-mentioned short-circuiting bar 12 is a cuboid-shaped strip structure made of insulating material, and protruding handles are fixedly provided at both ends of the short-circuiting bar. Through the handles, the short-circuiting bar is stuck between the symmetric tracks, and it is convenient for the staff to hold and exert force to push the short-circuiting bar to completely push the short-circuiting pieces on the short-circuiting bar into the short-circuiting slots of the current terminals. The above-mentioned short-circuiting pieces 13 are metal conductor pieces, embedded in the short-circuiting bar, and there are 3 pieces in total, corresponding to the two current terminals of phases A, B, and C respectively; moreover, the size of the short-circuiting pieces matches the size of the short-circuiting slots of the incoming and outgoing current terminals of each phase, that is, the thickness of the short-circuiting piece is the same as the height of the short-circuiting slot in the current terminal, the width of the short-circuiting piece is the same as the depth of the short-circuiting slot, and the length of the short-circuiting piece is the same as the distance between the two ends of the two current terminals of each phase, thereby achieving the connection of the two current terminals. Preferably, the short-circuiting piece is in the form of thinner at the front and thicker at the back, and the thickness of the front part of the short-circuiting piece is less than the height of the short-circuiting slot, and the thickness of the back part of the short-circuiting piece is slightly greater than the height of the short-circuiting slot, similar to a blade, which is convenient for the short-circuiting piece to be inserted into the short-circuiting slot of the current terminal.

[0050] Further, a first groove 15 is provided on the front side of the above-mentioned rail 14. The width of the first groove is the same as the width of the rear side of the short-circuiting bar, which is used to hold the short-circuiting bar to prevent the short-circuiting bar from sliding when not in use, resulting in a current short circuit. After the short-circuiting bar is held, there is enough space between it and the current terminal groove; a second groove 16 is provided at the middle position of the rail 14. The width of the second groove is the same as the width of the handles on both sides of the short-circuiting bar, and the short-circuiting bar is installed in the rail through the second groove; a third groove 17 is provided on the rear side of the front of the rail 14. The width of the third groove is the same as the thickness of the short-circuiting piece, which is used for the insertion of the short-circuiting piece. Specifically, when the short-circuiting piece enters the position where the third groove is located, the short-circuiting piece is inserted into the short-circuiting groove of the incoming and outgoing line current terminals of the corresponding phase. The two current terminals of each phase are short-circuited, and at this time, the function of replacing the meter without power interruption can be realized.

[0051] Through the above settings, when using this connector to replace the meter without power interruption, hold the handles at both ends of the short-circuiting bar with both hands and push it towards the current terminal, so that the three metal conductor pieces are completely pushed into the short-circuiting grooves of the incoming and outgoing line current terminals of each phase. At this time, the three-phase current of the watt-hour meter is short-circuited, and the meter can be replaced without power interruption.

[0052] In addition, a meter hanging post 18 is provided above the housing 1. A protrusion 19 matching the meter hanging part of the watt-hour meter is provided on the meter hanging post 18 to fix the watt-hour meter through this protrusion; screw fixing holes 20 are also provided on the meter hanging post 18 to further fix the watt-hour meter connector. Specifically, there is one screw fixing hole above the meter hanging post, two screw fixing holes below, and two screw fixing holes on each side of the housing, ensuring that the connector can be reliably fixed.

[0053] Embodiment 2

[0054] This embodiment proposes a method for using a three-phase transformer-type watt-hour meter connector, which is implemented by using the three-phase transformer-type watt-hour meter connector proposed in Embodiment 1, and realizes the function of replacing the meter without power interruption for high-voltage users through this connector.

[0055] The three-phase transformer-type watt-hour meter of high-voltage users is installed in the metering cabinet of the box substation or power distribution room. Install the proposed watt-hour meter connector in this metering cabinet, that is, after peeling the heads of the secondary current of the current transformer, the voltage wire, and the neutral wire, insert them into the limit wiring holes of the connector correspondingly, and then pass them into the corresponding wire fixing grooves, and fix the wire through the threaded holes and screws; the original watt-hour meter is installed on this watt-hour meter connector. On this basis, replace the meter without power interruption, which specifically includes the following steps:

[0056] Step 1: Push the short-circuiting bar in the connector towards the terminal through the handles at both ends of the short-circuiting bar, so that the three short-circuiting pieces on the short-circuiting bar are completely inserted into the short-circuiting grooves of the incoming and outgoing line current terminals of the three phases. At this time, the three-phase current of the watt-hour meter is short-circuited, and the watt-hour meter is replaced without power interruption;

[0057] Step 2: When replacing the electricity meter, pull out the original electricity meter upward until it is completely separated from the connector. Then, align each wiring hole of the electricity meter to be replaced with each terminal of the connector one by one, and insert the electricity meter onto the connector. After complete insertion, the hanging part of the electricity meter will just be stuck on the protrusion of the meter hanging column of the connector.

[0058] Step 3: After replacement, push the shorting bar in the connector away from the terminal, so that the shorting piece on the shorting bar completely leaves the shorting slot and the shorting bar is completely stuck in the first groove of the track. At this time, the electricity meter resumes normal metering.

[0059] Through the three-phase transformer-type electricity meter connector proposed in the above embodiment, the three-phase transformer-type electricity meter connector itself can realize the function of replacing the meter without power interruption. High-voltage users can use this connector to install and remove the electricity meter without installing a wiring box, which greatly improves the work efficiency of installing and removing the electricity meter, reduces the probability of incorrect wiring, and especially reduces the personal risks such as electric shock and voltage transformer short circuit faced by on-site staff in the high-voltage user's live distribution room or box substation.

[0060] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A three-phase transformer type energy meter connector, characterized in that, It includes a cuboid housing, on which three-phase terminal blocks slots are successively opened. Each phase terminal block slot includes two mutually isolated current terminal block slots, and incoming and outgoing line current terminal blocks are correspondingly installed in the two current terminal block slots. The current terminal block includes a plugging conductive column, a convex block and a wire fixing groove from top to bottom. A short-circuiting groove is provided on the front surface of the convex block. A short-circuiting mechanism is provided on the front surface of the housing. The short-circuiting mechanism includes a short-circuiting rod, and three short-circuiting pieces corresponding to phases A, B, and C are successively embedded on the short-circuiting rod. Each short-circuiting piece can be correspondingly inserted into the short-circuiting groove of the three-phase incoming and outgoing line current terminal blocks respectively to short-circuit the incoming and outgoing line current terminal blocks of each phase.

2. The three-phase current transformer type watt-hour meter connector according to claim 1, characterized in that, Two mutually isolated neutral terminal block slots are also opened on the housing, and the neutral terminal block slots are used to install neutral terminal blocks. Each phase terminal block slot further includes a voltage terminal block slot isolated from the current terminal block slot, and the voltage terminal block slot is used to install voltage terminal blocks.

3. The three-phase transformer-type watt-hour meter connector according to claim 2, wherein, The arrangement order of all terminal blocks is the same as that of the terminal blocks of the electricity meter. The arrangement order of all terminal blocks is: phase A incoming line current terminal block - phase A voltage terminal block - phase A outgoing line current terminal block - phase B incoming line current terminal block - phase B voltage terminal block - phase B outgoing line current terminal block - phase C incoming line current terminal block - phase C voltage terminal block - phase C outgoing line current terminal block - neutral terminal block - neutral terminal block.

4. The three-phase transformer-type energy meter connector according to claim 3, characterized in that, The voltage terminal block and the neutral terminal block have the same structure, including a plugging conductive column and a wire fixing groove from top to bottom. For any terminal block, the plugging conductive column is used for corresponding insertion and extraction of the electricity meter. A plurality of threaded holes are opened on the front surface of the wire fixing groove, and the wire passes through the wire fixing groove and is fixed by the threaded holes and screws.

5. The three-phase transformer-type energy meter connector according to claim 4, wherein A limiting wiring hole is opened on the bottom surface of each terminal block slot. After the head of the wire is peeled, it is inserted into the limiting wiring hole and then penetrates into the wire fixing groove of the corresponding terminal block.

6. The three-phase transformer-type watt-hour meter connector according to claim 1, characterized in that, The short-circuiting piece is a metal conductor piece. The size of the short-circuiting piece matches the size of the short-circuiting groove of the incoming and outgoing line current terminal blocks of each phase, that is, the thickness of the short-circuiting piece is the same as the height of the short-circuiting groove, the width of the short-circuiting piece is the same as the depth of the short-circuiting groove, and the length of the short-circuiting piece is the same as the distance between the two ends of the two current terminal blocks of each phase.

7. The three-phase transformer-type watt-hour meter connector according to claim 1, characterized in that, The short-circuiting mechanism further includes symmetric rectangular tracks protruding from both sides of the front surface of the housing, and both sides of the short-circuiting rod are installed in the symmetric tracks. The short-circuiting rod is a cuboid-shaped strip structure made of insulating material, and protruding handles are fixedly provided at both ends of the short-circuiting rod. The handles are used to make the short-circuiting rod stuck between the symmetric tracks and for pushing the short-circuiting rod.

8. The three-phase transformer-type watt-hour meter connector according to claim 7, characterized in that, A first groove is provided on the front side of the track. The width of the first groove is the same as the width of the rear side of the short-circuiting rod and is used to hold the short-circuiting rod. A second groove is provided at the middle position of the track. The width of the second groove is the same as the width of the handles on both sides of the short-circuiting rod and is used to install the short-circuiting rod. A third groove is provided on the rear side of the front surface of the track. The width of the third groove is the same as the thickness of the short-circuiting piece and is used for embedding the short-circuiting piece.

9. The three-phase transformer-type watt-hour meter connector according to claim 1, characterized in that, Above the housing, there is a wall clock post. On the wall clock post, there are protrusions that match the electricity meter hanging parts, and the protrusions are used to fix the electricity meter. There are also screw fixing holes on the wall clock post, through which the electricity meter connector is further fixed.

10. A method for using a connector of a three-phase transformer-type watt-hour meter, characterized in that, It is realized by using the three-phase current transformer type electricity meter connector according to any one of claims 1-9, and includes the following steps: Through the handles at both ends of the shorting bar, push the shorting bar in the connector towards the terminal post, so that the three shorting pieces on the shorting bar are completely inserted into the shorting slots of the incoming and outgoing line current terminal posts of the three phases. At this time, the three-phase current of the electricity meter is short-circuited, and the electricity meter can be replaced without power outage. When replacing the electricity meter, pull out the original electricity meter upward until it is completely separated from the connector. Then, align each wiring hole of the electricity meter to be replaced with each terminal post of the connector one by one, and insert the electricity meter onto the connector. After complete insertion, the electricity meter hanging part will just be stuck on the protrusion of the wall clock post of the connector. After the replacement is completed, push the shorting bar in the connector away from the terminal post, so that the shorting pieces on the shorting bar completely leave the shorting slot and the shorting bar is completely stuck in the first groove of the track. At this time, the electricity meter resumes normal metering.

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