A secondary quick-install grounding device for voltage transformer

Abstract

The present invention discloses a voltage transformer secondary quick-install grounding device, wherein a voltage transformer secondary quick-install grounding device comprises: an interface converter, a first quick-install plug, a second quick-install plug, a grounding wire and a grounding wire busbar socket; one end of the interface converter is connected to the voltage transformer secondary circuit breaker, and the other end is detachably connected to the first quick-install plug; one end of the grounding wire is connected to the first quick-install plug, and the other end is connected to the second quick-install plug; the grounding wire busbar socket is installed on the grounding wire busbar, and the second quick-install plug is detachably connected to the grounding wire busbar socket. This is to solve the problem that in the past, when performing maintenance on substation equipment, it was impossible to quickly and effectively install grounding wires without damaging the lines, and the existing grounding wire installation device required the voltage transformer to be modified in order to connect the grounding wire, and the connection and disassembly process was too complicated.

Description

Technical Field

[0001] The invention relates to the technical field of electric power, in particular to a secondary quick-install grounding device for a voltage transformer. Background Art

[0002] During the operation and maintenance of the substation, the secondary side of the voltage transformer needs to be connected to the ground wire to prevent the secondary fuse or circuit breaker of the voltage transformer from not being disconnected during operation, causing the secondary voltage generated by the operating voltage transformer to be sent back to the maintenance equipment through the parallel voltage circuit, that is, the secondary voltage transformer reversely charges the primary voltage, causing the voltage transformer under maintenance to be energized, endangering the personal safety of the maintenance personnel. At present, during the operation and maintenance of the substation, it is impossible to effectively install a ground wire on the secondary side of the voltage transformer, because there is no position on the upper and lower connecting lines of the secondary circuit breaker of the voltage transformer to connect the ground wire. If the ground wire is to be connected, the insulation skin on the upper and lower lines of the circuit breaker needs to be peeled off for connection, but this operation will destroy the insulation effect of the line and easily cause danger. The existing secondary ground wire fixing device of the voltage transformer needs to modify the current transformer in advance when in use. The process of installing and removing the ground wire is complicated and cumbersome, and the ground wire cannot be installed quickly and effectively. Summary of the invention

[0003] In view of this, the present invention provides a secondary quick-install grounding device for a voltage transformer to solve the problem that, during the previous operation and maintenance of a substation, it was impossible to quickly and effectively install a grounding wire without damaging the line, and the existing grounding wire installation device required the voltage transformer to be modified before the grounding wire could be connected, and the connection and disassembly process was too complicated.

[0004] The present invention provides a voltage transformer secondary quick-install grounding device, comprising: an interface converter, a first quick-install plug, a second quick-install plug, a grounding wire and a grounding wire busbar socket;

[0005] One end of the interface converter is connected to the secondary circuit breaker of the voltage transformer, and the other end is detachably connected to the first quick-release plug;

[0006] One end of the grounding wire is connected to the first quick-release plug, and the other end is connected to the second quick-release plug;

[0007] The grounding wire busbar socket is installed on the grounding wire busbar, and the second quick-release plug is detachably connected to the grounding wire busbar socket.

[0008] Preferably, the interface converter comprises: a first insulating socket and a connecting block;

[0009] The first insulating socket is hollow inside and has an opening at one end. The first insulating socket has a first insulating layer on the outside near the opening end. The other end of the first insulating socket is connected to one end of the connecting block through a threaded structure.

[0010] The connection block is connected to the voltage transformer secondary circuit breaker.

[0011] Preferably, the main body of the connection block is a rectangular parallelepiped, and one end of the connection block is connected to the first insulating socket via a threaded structure;

[0012] A protrusion is provided on the side wall of the other end of the connection block, and the protrusion is connected to the voltage transformer secondary circuit breaker.

[0013] Preferably, the grounding busbar socket comprises: a second insulating socket and a nut;

[0014] The interior of the second insulating socket is hollow, one end is open, and the other end has an external thread;

[0015] The ground busbar is provided with a mounting hole, and the other end of the second insulating socket passes through the mounting hole;

[0016] There are two nuts, which are sleeved on the other end of the second insulating socket and are located at the top and bottom of the ground busbar respectively, and the internal thread of the nut matches the external thread of the other end of the second insulating socket;

[0017] A second insulating layer is provided on the outer wall of one end of the second insulating socket.

[0018] Preferably, it also includes: a height adjustment ring;

[0019] The height adjustment ring is sleeved on the second insulating socket and is located between the second insulating layer and the nut.

[0020] Preferably, the first quick-release plug and the second quick-release plug have arc-shaped protrusions on their side walls respectively.

[0021] The present invention has the following beneficial effects:

[0022] The present invention provides a voltage transformer secondary quick-install grounding device, which realizes quick connection or disconnection by arranging an interface converter installed on the voltage transformer secondary circuit breaker, cooperating with a quick-install plug and an insulating socket, thereby solving the problem that in the past, during substation operation and maintenance, it was impossible to quickly and effectively install a grounding wire without damaging the line, and the existing grounding wire installation device required the voltage transformer to be modified before the grounding wire could be connected, and the connection and disassembly processes were too complicated. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0024] Figure 1 The present invention is a schematic diagram of the structure of a secondary quick-install grounding device for a voltage transformer according to an embodiment of the present invention.

[0025] Figure 2 is a cross-sectional view of an interface converter in an embodiment of the present invention.

[0026] Figure 3 It is a cross-sectional view of the grounding busbar socket in an embodiment of the present invention.

[0027] In the figure, 1-first quick-release plug, 2-ground wire, 3-ground busbar, 4-first insulating socket, 5-connecting block, 6-protrusion, 7-second quick-release plug, 9-voltage transformer secondary circuit breaker, 10-inlet slot, 11-power cord, 12-first insulating layer, 13-second insulating socket, 14-second insulating layer, 15-nut, 16-height adjustment ring, 17-gasket. DETAILED DESCRIPTION

[0028] The present invention is described below based on embodiment, but it is worth noting that the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. However, for the part not described in detail, those skilled in the art can also fully understand the present invention.

[0029] In addition, those skilled in the art should understand that the drawings are only provided to illustrate the purpose, features and advantages of the present invention, and the drawings are not actually drawn to scale.

[0030] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0031] Figure 1 The present invention is a schematic diagram of the structure of a secondary quick-install grounding device for a voltage transformer according to an embodiment of the present invention. Figure 2 is a cross-sectional view of an interface converter in an embodiment of the present invention. Figure 3 FIG. 1 is a cross-sectional view of a grounding busbar socket according to an embodiment of the present invention. Figure 1 , Figure 2 , Figure 3As shown, a voltage transformer secondary quick-install grounding device comprises: an interface converter, a first quick-install plug 1, a second quick-install plug 7, a grounding wire 2 and a grounding wire busbar socket; one end of the interface converter is connected to the voltage transformer secondary circuit breaker 9, and the other end is detachably connected to the first quick-install plug 1; one end of the grounding wire 2 is connected to the first quick-install plug 1, and the other end is connected to the second quick-install plug 7; the grounding wire busbar socket is installed on the grounding wire busbar 3, and the second quick-install plug 7 is detachably connected to the grounding wire busbar socket.

[0032] In an embodiment of the present invention, an interface converter is used to connect the first quick-release plug 1 and the voltage transformer to the secondary circuit breaker. During installation, remove the voltage transformer secondary circuit breaker 9, unscrew the top screw, and then insert one end of the interface converter into the incoming line slot 10 at the top of the secondary circuit breaker, connect the power cord 11 inside the incoming line slot 10 to the rear of the interface converter in the incoming line slot 10, and then re-tighten the screws, and finally re-install the secondary circuit breaker on the voltage transformer. Install the grounding busbar socket on the grounding busbar 3. When in use, connect the first quick-release plug 1 to the interface converter, and then connect the second quick-release plug 7 to the grounding busbar socket to complete the connection of the grounding wire 2.

[0033] In the present invention and Figure 1 , Figure 2 In the figure, the interface converter includes: a first insulating socket 4 and a connecting block 5; the interior of the first insulating socket 4 is hollow and one end is open, the outside of the first insulating socket 4 near the open end has a first insulating layer 12, and the other end of the first insulating socket 4 is connected to one end of the connecting block 5 through a threaded structure; the connecting block 5 is connected to the voltage transformer secondary circuit breaker 9.

[0034] In an embodiment of the present invention, the material of the connecting block 5 is brass. The body of the first insulating socket 4 is a cylinder made of brass, and one end is wrapped with insulating rubber. During installation, one end of the connecting block 5 is inserted into the incoming line slot 10 on the voltage transformer secondary circuit breaker 9, and is contacted and connected with the internal contacts of the incoming line slot 10, so that the first insulating socket 4 is connected to the voltage transformer secondary circuit breaker 9 through the connecting block 5. When in use, the first quick-release plug 1 is inserted into the first insulating socket 4 from one end opening, and the second quick-release plug 7 is connected to the grounding busbar socket. At this time, the voltage transformer secondary circuit breaker 9 is grounded through the connecting block 5, the first insulating socket 4, the first quick-release plug 1, the grounding wire 2, the second quick-release plug 7, and the grounding busbar socket and the grounding busbar 3. Every time a grounding connection is required, quick connection or disconnection is achieved by plugging and unplugging the first quick-release plug 1 and the first insulating socket 4. After frequent use for a period of time, the first insulating socket 4 can be replaced. Since the first insulating socket 4 is threadedly connected to the connecting block 5, it only needs to be rotated and unscrewed for replacement. The outside of the first insulating socket 4 has a first insulating layer 12, which can prevent the operator from electric shock during replacement.

[0035] In the present invention and Figure 1 In the figure, the main body of the connecting block 5 is a rectangular parallelepiped, and one end of the connecting block 5 is connected to the first insulating socket 4 through a threaded structure; a protrusion 6 is provided on the side wall of the other end of the connecting block 5, and the protrusion 6 is connected to the secondary circuit breaker 9 of the voltage transformer.

[0036] In an embodiment of the present invention, the protrusion 6 is a rectangular parallelepiped, which is perpendicular to the side wall of the connection block 5. During installation, the protrusion 6 is inserted into the secondary circuit breaker incoming line slot 10 so that it is in contact with the contacts in the incoming line slot 10. When in use, the first quick-release plug 1 is connected to the first insulating socket 4, and the second quick-release plug 7 is connected to the grounding busbar socket, so as to complete the connection of the voltage transformer secondary grounding wire 2. In the equipment terminal box, the space is small because the secondary wiring needs to be accommodated above the secondary circuit breaker 9 of the voltage transformer. If the interface converter is set to be placed in a vertical direction and the first quick-release plug 1 is connected, it will be inconvenient to operate because the space above is too narrow. The connection block 5 is set to be placed horizontally, and the protrusion 6 is set on its side wall to be inserted into the incoming line slot 10 for connection, so that the first quick-release plug 1 can be inserted from the front, which is convenient for the operator to quickly connect.

[0037] In the present invention and Figure 1 , Figure 3In the figure, the grounding busbar socket includes: a second insulating socket 13 and a nut 15; the interior of the second insulating socket 13 is hollow, one end is open, and the other end has an external thread; a mounting hole is provided on the grounding busbar 3, and the other end of the second insulating socket 13 passes through the mounting hole; there are two nuts 15, which are sleeved on the other end of the second insulating socket 13, and are located at the top and bottom of the grounding busbar 3 respectively, and the internal thread of the nut 15 matches the external thread of the other end of the second insulating socket 13; a second insulating layer 14 is provided on the outer wall of one end of the second insulating socket 13.

[0038] In the embodiment of the present invention, the body of the second insulating socket 13 is a cylinder made of brass. During installation, one of the two nuts 15 is threadedly sleeved on the outside of the second insulating socket 13, close to the second insulating layer 14, and then the other end of the second insulating socket 13 is inserted into the mounting hole of the ground busbar 3, and the other end of the second insulating socket 13 passes through the mounting hole, and then another nut 15 is threadedly sleeved on the other end of the second insulating socket 13. At this time, the two nuts 15 are on the second insulating socket 13, and are located at the top and bottom of the ground busbar 3. The nut 15 at the top of the ground busbar 3 is screwed down, and then the nut 15 at the bottom of the ground busbar 3 is screwed up. The two nuts 15 gradually approach each other, and the ground busbar 3 is clamped, so that the second insulating socket 13 is fixed on the ground busbar 3, wherein gaskets 17 are respectively installed between the two nuts 15 and the ground busbar 3, and the gaskets 17 are used to prevent the nuts 15 from loosening. When in use, the second quick-release plug 7 is inserted into the second insulating socket 13 from one end opening thereof, and the side wall of the second insulating socket 13 contacts the ground busbar 3 in the mounting hole, so that the ground wire 2 is connected to the ground busbar 3 through the second quick-release plug 7 and the second insulating socket 13. The second insulating layer 14 is used for quickly disassembling the second insulating socket 13 by rotating one end thereof when the second insulating socket 13 needs to be replaced, and the second insulating layer 14 isolates the current to prevent the operator from electric shock.

[0039] In the present invention and Figure 1 The height adjustment ring 16 is also included; the height adjustment ring 16 is sleeved on the second insulating socket 13 and is located between the second insulating layer 14 and the nut 15

[0040] In the embodiment of the present invention, when the second insulating socket 13 is connected to the ground busbar 3, due to the different thicknesses of the ground busbar 3, when the thinner ground busbar 3 is connected, the other end of the second insulating socket 13 may extend too far from the bottom of the ground busbar 3 after being inserted into the mounting hole. When the operator is operating, the excessively protruding portion may scrape other components or lines, hindering installation or other operations. On the second insulating socket 13, one or more height adjustment rings 16 are set between the second insulating layer 14 and the nut 15 at the top of the ground busbar 3 to adjust the length of the other end of the second insulating socket 13 extending from the bottom of the ground busbar 3, to prevent the second insulating socket 13 from extending too far from the bottom of the ground busbar 3, or the nut 15 at the top of the ground busbar 3 on the second insulating socket 13 is too far away from the second insulating layer 14, which may easily cause loosening during long-term use.

[0041] In the present invention and Figure 1 In the embodiment, the first quick-release plug 1 and the second quick-release plug 7 have arc-shaped protrusions on their side walls respectively.

[0042] In the embodiment of the present invention, the first quick-release plug 1 and the second quick-release plug 7 are made of brass. A structure with an arc-shaped protrusion is set in the middle position on the side wall of the first quick-release plug 1 and the second quick-release plug 7. The inside of the arc-shaped protrusion and the side wall of the first quick-release plug 1 are hollow. Because it is made of brass, it has a certain elasticity. The opening diameter of the first insulating socket 4 is slightly smaller than the diameter of the arc-shaped protrusion of the first quick-release plug 1. When the first quick-release plug 1 is inserted into the first insulating socket 4, the arc-shaped protrusion is compressed inwardly, and due to the elastic force, it fits tightly with the inner wall of the first insulating socket 4, so that the first quick-release plug 1 and the first insulating socket 4 are connected more tightly. The structure of the second quick-release plug 7 is the same as that of the first quick-release plug 1. The inner diameter of the second insulating socket 13 is slightly smaller than the diameter of the arc-shaped protrusion of the second quick-release plug 7. When the second quick-release plug 7 is inserted into the second insulating socket 13, the arc-shaped protrusion fits tightly with the inner wall of the second insulating socket 13. By providing an arc-shaped protrusion structure on the side walls of the first quick-release plug 1 and the second quick-release plug 7, the first quick-release plug 1 and the second quick-release plug 7 are more tightly connected to the first insulating socket 4 and the second insulating socket 13 to prevent them from being easily separated during use.

[0043] In the embodiment of the present invention, during installation, the voltage transformer secondary circuit breaker 9 is removed, the top screw is unscrewed, and then the protrusion 6 of the interface converter connection block 5 is inserted into the incoming line slot 10, so that the protrusion 6 is in contact and connected with the contact in the incoming line slot 10, and the power cord 11 in the incoming line slot 10 is connected to the rear of the interface converter in the incoming line slot 10, and then the screws are tightened again, and finally the voltage transformer secondary circuit breaker 9 is installed back to its original position.

[0044] According to the thickness of the ground busbar 3, one or more height adjustment rings 16 are put on the second insulating socket 13, and then one of the two nuts 15 is put on the second insulating socket 13 and positioned below the height adjustment ring 16. The other end of the second insulating socket 13 is passed through the mounting hole of the ground busbar 3, and another nut 15 is put on the other end of the second insulating socket 13. The two nuts 15 are tightened relative to each other to clamp the ground busbar 3, thereby fixing the second insulating socket 13 to the ground busbar 3.

[0045] When in use, the first quick-release plug 1 is inserted into the first insulating socket 4, and the second quick-release plug 7 is inserted into the second insulating socket 13. At this time, the voltage transformer secondary circuit breaker 9 completes the connection of the grounding wire 2 through the protrusion 6, the connecting block 5, the first insulating socket 4, the first quick-release plug 1, the grounding wire 2, the second quick-release plug 7 and the second insulating socket 13, and the operator can start maintenance work.

[0046] The present invention can quickly and effectively complete the rapid installation of the secondary grounding wire 2 of the voltage transformer, which is completely in line with the provisions of Article 7, Item 7 of the "Implementation Plan for the Management of Electrical Operation Tickets of State Grid Heilongjiang Electric Power Co., Ltd." which clearly points out that the secondary of the voltage transformer should be prevented from reverse charging the primary, and meets the "Regulations on the Management of Electric Safety Tools of State Grid Corporation of China State Grid Enterprise Management

[2014] No. 748" individual protective equipment test items, cycles and requirements: Group DC resistance test: cross-sectional area mm26~10, average resistance value per meter mΩ≤1.9 requirements.

[0047] The present invention has low manufacturing cost and simple installation, and does not require complicated modification of the voltage transformer. It is easy to use and avoids many cumbersome operations. It perfectly solves the problem that the power company cannot install the grounding wire 2 on the secondary side of the voltage transformer, and avoids the risk of personal injury to maintenance test personnel due to the inability to install the grounding wire 2. When the secondary quick-install grounding device of the voltage transformer is not used, the grounding wire 2 and the first quick-install plug 1 and the second quick-install plug 7 can be placed in the tool room. When the maintenance work involves grounding, the operator first firmly inserts the first quick-install plug 1 and the second quick-install plug 7 at both ends of the grounding wire 2, and the entire grounding can be completed. It is simple and fast, and the time for substation operation is shortened.

[0048] The above embodiments are only for expressing the implementation mode of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several modifications, equivalent substitutions, improvements, etc. can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A voltage transformer secondary quick-install grounding device, characterized in that: include: An interface converter, a first quick-release plug (1), a second quick-release plug (7), a grounding wire (2), and a grounding wire busbar socket; One end of the interface converter is connected to the voltage transformer secondary circuit breaker (9), and the other end is detachably connected to the first quick-release plug (1); the interface converter comprises: a first insulating socket (4) and a connection block (5); the first insulating socket (4) has a first insulating layer (12) on its exterior near one end of the opening; one end of the connection block (5) is connected to the first insulating socket (4) via a threaded structure; a protrusion (6) is provided on the side wall of the other end of the connection block (5); the protrusion is inserted into the secondary circuit breaker inlet slot so as to be in contact with the contact in the inlet slot; the protrusion body is a rectangular parallelepiped and is perpendicular to the side wall of the connection block; One end of the grounding wire (2) is connected to the first quick-release plug (1), and the other end is connected to the second quick-release plug (7); The grounding busbar socket is mounted on the grounding busbar (3), and the second quick-release plug (7) is detachably connected to the grounding busbar socket; the grounding busbar socket comprises: a second insulating socket (13) and a nut (15); the grounding busbar (3) is provided with a mounting hole, and the other end of the second insulating socket (13) passes through the mounting hole; there are two nuts (15), which are sleeved on the other end of the second insulating socket (13) and are located at the top and bottom of the grounding busbar (3) respectively; the outer wall of one end of the second insulating socket (13) is provided with a second insulating layer (14); The first insulating socket, the second insulating socket, the connecting block, the first quick-release plug and the second quick-release plug are made of brass.

2. According to claim 1, the voltage transformer secondary quick-install grounding device is characterized in that: The interior of the first insulating socket (4) is hollow, and one end is open; the other end of the first insulating socket (4) is connected to one end of the connecting block (5) via a threaded structure; The connection block (5) is connected to the voltage transformer secondary circuit breaker (9).

3. According to claim 2, the voltage transformer secondary quick-install grounding device is characterized in that: The main body of the connecting block (5) is a rectangular parallelepiped.

4. The voltage transformer secondary quick-install grounding device according to any one of claims 1 to 3, characterized in that: The interior of the second insulating socket (13) is hollow, one end is open, and the other end has an external thread; The internal thread of the nut (15) matches the external thread of the other end of the second insulating socket (13).

5. The voltage transformer secondary quick-install grounding device according to claim 4, characterized in that: Also includes: Height adjustment ring (16); The height adjustment ring (16) is sleeved on the second insulating socket (13) and is located between the second insulating layer (14) and the nut (15).

6. The voltage transformer secondary quick-install grounding device according to any one of claims 1-3 and 5, characterized in that: The first quick-release plug (1) and the second quick-release plug (7) each have an arc-shaped protrusion on their side walls.

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