KR20240125889A - Safety joint for detecting fault position including stumbling block - Google Patents

Abstract

The present invention relates to a safety connecting member for a fault detection test having a catch, comprising: a first connector including a first conductor part made of a metal material on one side and a second conductor part made of a metal material on the other side to be inserted into a grounding switch terminal of a gas-insulated switch; and a second connector including a first conductor insertion part having a first conductor insertion groove formed in such a way that the second conductor part is inserted, and a second conductor insertion part having a second conductor insertion groove formed in such a way that a lead cable is inserted; whereby a test cable can be stably connected to grounding switch terminals of various sizes, thereby ensuring an insulation distance when a high-voltage test voltage is applied and performing accurate fault detection test work through the development of a dedicated connecting member.

Description

{SAFETY JOINT FOR DETECTING FAULT POSITION INCLUDING STUMBLING BLOCK}

The present invention relates to a safety connection for a fault detection test having a catch, and more specifically, to a safety connection for a fault detection test coupled to an earthing switch so as to detect a fault in an underground transmission line in a gas-insulated switchgear.

In general, substations are divided into outdoor substations and indoor substations depending on the installation location. In suburban areas where the building density per unit area of land is low, it is economically advantageous to sufficiently space out components and lines, so outdoor substations, which are inexpensive and easy to install, are installed on the open ground.

However, in urban areas where the building density per unit area is high, it is economically advantageous to sufficiently insulate the components and lines, so indoor substations using the gas insulated switchgear (GIS) method are installed.

Gas-insulated switchgear is used in facilities where high voltage current flows, and is used to safely open and close lines when an abnormality such as an accident or short circuit occurs outside of the normal state to protect the power system. It consists of the main bus, circuit breaker (CB), disconnecting switch (DS), earthing switch (ES), lightning arrester, etc., which are the main components of a substation, and is filled with _SF6 gas, an inert gas with excellent insulating performance, to promote miniaturization and safety of the substation.

In order to control the operation of these gas-insulated switchgear, an actuator is essential, and the actuator controls the operation of the gas-insulated switchgear by electrical signals or mechanical movements.

Meanwhile, these gas-insulated switchgear must undergo a withstand voltage test to test whether they can withstand a voltage of 50,000 to 70,000 V for 1 minute to ensure product stability, and must be continuously monitored to prevent electrical accidents caused by failures.

However, in the process of applying test power to detect a fault in a cable by connecting it to a connecting material connected to a grounding switch, there is a risk that the cable extension connected to the measuring equipment may be unstable due to the absence of a test terminal, which may cause an electric shock or lead to a fire.

Korean Patent Publication No. 10-1522271

The present invention was created to improve the problems of the absence of a dedicated terminal for detecting a fault point of an underground transmission line cable in an insulating switch of a conventional gas-insulated switchgear as described above, and the purpose of the present invention is to provide a safety connection material for a fault point detection test that is coupled to an earthing switch and can stably apply a test voltage.

In order to achieve the above-described purpose, a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention comprises: a first connector including a first electrode part made of a metal material on one side and a second electrode part made of a metal material on the other side to be inserted into a grounding switch terminal of a gas-insulated switch; and a second connector including a first electrode insertion part having a first electrode insertion groove formed to allow the second electrode part to be inserted and a second electrode insertion part having a second electrode insertion groove formed on the other side to allow a lead cable to be inserted.

The above first connector may further include a catch extending horizontally outwardly along the periphery of the first conductor portion so as to be inserted into and caught by the grounding switch terminal.

The above-mentioned catch can be formed with a rounded outer edge.

The above first conductor portion can be formed with a width corresponding to the width of the terminal insertion groove so as to be inserted into the terminal insertion groove of the grounding switch terminal.

The above first conductor insertion portion may further include a first fixing ring inserted into a first insertion groove formed on an inner wall surface to pressurize the second conductor portion inserted inside.

The above first conductor insertion portion may further include a first friction pad that is inserted into a second insertion groove formed on an inner wall surface to prevent the second conductor portion inserted inside from coming off, and that provides frictional force by coming into contact with the second conductor portion.

The above second conductor insertion portion may further include a second fixing ring inserted into a third insertion groove formed on an inner wall surface to pressurize a lead cable inserted inside.

The second conductor insertion portion may further include a second friction pad that is inserted into a fourth insertion groove formed on an inner wall surface to prevent the lead cable inserted inside from coming off, and that generates frictional force by coming into contact with the lead cable.

In addition, a safety connection material for a fault detection test having a catch according to one embodiment of the present invention may further include an insulating cover that surrounds the first connector and the second connector from the outside.

The above insulating cover may include a hollow cover passageway through which the first connector and the second connector can pass, a cover connecting portion protruding outward along the periphery of the cover passageway to prevent foreign substances from entering from the outside, and an extension portion that is vertically bent and extended from an end of the cover connecting portion.

As described above, according to the safety connection material for fault detection testing having a catch according to the present invention, a test cable can be stably connected to grounding switch terminals of various sizes so as to secure stability when a test voltage is applied, thereby blocking noise generated at the connection part and obtaining an improved fault diagnosis rate.

Figure 1 is a photograph of the grounding switch included in a conventional gas-insulated switchgear, viewed from the outside.
Figure 2 is a photograph viewed from the outside, showing a test lead cable connected to test a grounding switch included in a conventional gas-insulated switchgear.
FIG. 3 is a partially broken perspective view showing a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention from the outside, with a portion of the insulating cover broken off.
FIG. 4 is an exploded perspective view showing a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention, broken down into components.
FIG. 5 is a cross-sectional view showing a cross-section of a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a cross-section of a grounding switch terminal into which a test terminal of a gas-insulated switch provided in the present invention is inserted.
FIG. 7 is a cross-sectional view showing a cross-section of a lead cable connected to a safety connecting member for a fault detection test equipped with a catch provided in the present invention.
FIG. 8 is a cross-sectional view showing the widths of the conductive members in the first connector of a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a cross-section of a second connector of a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention.
FIG. 10 is a cross-sectional view showing a cross-section of an insulating cover of a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

The present invention can have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and specifically described in the detailed description. This is not intended to limit the present invention to specific embodiments, but should be interpreted to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

In describing the present invention, the terms first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term "and/or" may include any combination of multiple related listed items or any one of multiple related listed items.

When a component is referred to as being "connected" or "connected" to another component, it can be understood that it may be directly connected or connected to that other component, but there may also be other components in between. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it can be understood that there are no other components in between.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, and can be understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, may be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and may not be interpreted in an idealized or overly formal sense, unless explicitly defined in this application.

In addition, the following examples are provided to more completely explain to a person having average knowledge in the art, and the shapes and sizes of elements in the drawings may be exaggerated for a clearer explanation.

Referring to Figure 1, a load break switchgear has been developed and used to enable branching, dividing, testing and maintenance of conventional high-voltage distribution lines, and since the handling voltage is high voltage, each switching mechanism has a structure in which it is installed in a container containing an insulating gas such as sulfur hexafluoride (SF ₆ ) gas with excellent electrical insulation performance.

In order to inspect the insulation status under high-voltage conditions at the grounding switch terminal (2) located on the side of a gas-insulated switch (1) that insulates high-voltage switchgear using gas, a lead cable (3) extended from a voltage application device is inserted as shown in Fig. 2 and a high voltage (0.5 to 9 kV) is applied to conduct a test.

However, since the specifications differ depending on the manufacturer, if the lead cable (3) is directly inserted into the grounding switch terminal (2), the connection is unstable, and there is a possibility of a safety accident due to the application of high voltage.

In order to solve the above-mentioned problem, referring to FIGS. 3 and 4, a safety connecting member for a fault detection test having a catch according to one embodiment of the present invention includes a first connector (10) including a first conductor part (11) made of a metal material on one side and a second conductor part (12) made of a metal material on the other side to be inserted into a grounding switch terminal (2) of a gas-insulated switch (1), a first conductor insertion part (22) having a first conductor insertion groove (22a) formed to allow the second conductor part (12) to be inserted, and a second connector (20) including a second conductor insertion part (23) having a second conductor insertion groove (23a) formed on the other side to allow the lead cable (3) to be inserted.

To explain in detail, the grounding switch terminal (2) of the gas-insulated switchgear (1) includes a column-shaped terminal body (2a) coupled to the upper part of the main body of the gas-insulated switchgear (1), a terminal flange (2b) extending horizontally outward along the perimeter of the terminal body (2a), a terminal connector (2c) coupled by being inserted into the inner surface of the terminal body (2a), a terminal insertion groove (2d) formed such that the terminal connector (2c) is recessed in the center so that a first connector (10) or a lead cable (3) can be inserted from the outside, and a terminal fastening bolt (2e) inserted into the main body of the gas-insulated switchgear (1) by penetrating the terminal flange (2b).

Referring to Fig. 6, the terminal body (2a) can be formed in the shape of a cylinder, a polygonal cylinder, or a trapezoidal cylinder, and a person skilled in the art can change the shape of the main body.

The above terminal flange (2b) may extend horizontally in an outward direction around the terminal body (2a), or may extend at a predetermined angle with the surface of the main body so as to reduce the space occupied by the main body.

The above terminal connector (2c) is inserted into the inner surface of the terminal body (2a) and is formed of a conductive material so that current can flow.

The above terminal insertion groove (2d) can be formed in a cylindrical shape, a polygonal cylinder shape, etc., so that a lead cable (3) or the first connector (10) of the present invention can be inserted from the outside by being inserted into the center of the terminal connector (2c).

Referring to FIG. 7, the lead cable (3) is formed to include a wire (3a) connected to a voltage application device that applies high voltage, a bar-shaped lead terminal (3d) connected to the end of the wire (3a), a cable protection cap (3b) that wraps around the outside of the lead terminal (3d), and a cable insertion groove (3c) that is recessed in the center of the cable protection cap (3b) and into which the first connector (10) can be inserted.

The first connector (10) includes a first conductor part (11) formed in a pillar shape made of a metal material capable of conducting current on one side to be inserted into a grounding switch terminal (2), and a second conductor part (12) formed in a pillar shape made of a metal material capable of conducting current on the other side to be inserted into the second connector (20).

The above first conductor part (11) and the above second conductor part (12) can be formed in the shape of a cylinder or polygonal cylinder, and copper, tungsten, or aluminum with excellent current conductivity can be used, and aluminum with excellent corrosion resistance can be used so that testing can be performed in an external environment.

The first conductor insertion portion (22) is formed in a hollow cylinder shape overall by forming a first conductor insertion groove (22a) by recessing the center so that the second conductor portion (12) can be inserted.

The second conductor insertion portion (23) is formed in a hollow barrel shape overall by being recessed in the center to allow the lead cable (3) to be inserted from the outside, thereby forming a second conductor insertion groove (23a).

The above first connector (10) further includes a catch (13) extending horizontally outwardly along the circumference of the first conductive portion (11) that comes into contact with the second conductive portion (12) so as to be inserted into and caught by the grounding switch terminal (2).

The above-mentioned catch (13) catches the first conductor part (11) when it is inserted into the grounding switch terminal (2) and prevents the second conductor part (12) from being inserted together, so that the first conductor part (11) can move away from the grounding switch terminal (2) by an external force.

The above-mentioned catch (13) is formed with a rounded outer edge, thereby reducing noise generated by collision with the grounding switch terminal (2) and preventing foreign substances introduced from the outside from slipping and attaching.

The first conductor part (11) above is formed so that the width of the main body corresponds to the terminal insertion groove (2d) so that it can be inserted into the terminal insertion groove (2d) of the grounding switch terminal (2), thereby preventing the lead cable (3) connected externally from shaking due to different widths depending on the manufacturer.

In other words, since the specifications of the grounding switch terminal (2) of the gas-insulated switch (1) differ depending on the manufacturer, a gap is created between the terminal insertion groove (2d) and the lead cable (3), and thus, to prevent foreign substances from entering from the outside or a safety accident from occurring due to high voltage, the width of the first conductor section is formed to be the same as the width of the terminal insertion groove (2d).

The above first conductor insertion portion (22) may further include a first fixing ring (22b) inserted into a first insertion groove (22d) formed on an inner wall surface to pressurize the second conductor portion (12) inserted inside.

The above first fixing ring (22b) is inserted into the first insertion groove (22d) formed by insertion on the inner wall surface of the first conductor insertion portion (22), and presses the second conductor portion (12) inserted from the outside to block the gap.

The above first fixing ring (22b) is formed of a rubber material with excellent insulating properties, including polyethylene or polypropylene, so that the second conductor part (12) is brought into close contact with the first conductor insertion part (22) by elastic force.

The first conductor insertion portion (22) is inserted into a second insertion groove (22e) formed on the inner wall surface to prevent the second conductor portion (12) inserted inside from coming off, and may further include a first friction pad (22c) that comes into contact with the second conductor portion (12) to generate frictional force.

The above first friction pad (22c) is inserted into a second insertion groove (22e) formed by being inserted into another inner wall surface of the first conductor insertion portion (22), and comes into contact with the second conductor portion (12) inserted from the outside to provide frictional force.

The surface of the first friction pad (22c) comes into contact with the second conductor portion (12) to provide frictional force, thereby preventing the second conductor portion (12) from slipping away from the first conductor insertion portion (22) and being removed.

The surface of the first friction pad (22c) may include a number of protruding projections to improve frictional force.

In addition, the second conductor insertion portion (23) may further include a second fixing ring (23b) inserted into a third insertion groove (22d) formed on the inner wall surface to pressurize the lead cable (3) inserted inside.

The second fixing ring (23b) is inserted into the third insertion groove (23d) formed by inserting into the inner wall surface of the second conductor insertion portion (23), and blocks the gap by applying pressure to the lead cable (3) inserted from the outside.

The second fixing ring (23b) is formed of a rubber material with excellent insulating properties, including polyethylene or polypropylene, so that the lead cable (3) is in close contact with the second conductor insertion portion (23) by elasticity.

The second conductor insertion portion (23) is inserted into a fourth insertion groove (22e) formed on the inner wall surface to prevent the lead cable (3) inserted inside from coming off, and may further include a second friction pad (23c) that comes into contact with the lead cable (3) and generates frictional force.

The second friction pad (23c) is inserted into the fourth insertion groove (23e) formed by inserting into another inner wall surface of the second conductor insertion portion (23), and comes into contact with the lead cable (3) inserted from the outside to provide frictional force.

The surface of the second friction pad (23c) comes into contact with the lead cable (3) to provide frictional force, thereby preventing the lead cable (3) from slipping away from the second conductor insertion portion (23) and being removed.

The surface of the second friction pad (23c) may include a number of protruding projections to improve frictional force.

In addition, a safety connection material for a fault detection test having a catch according to one embodiment of the present invention further includes an insulating cover (30) that surrounds the first connector (10) and the second connector (20) from the outside.

The above insulating cover (30) includes a hollow cover passage (32) through which the first connector (10) and the second connector (20) can pass, a cover connecting portion (31a) protruding outward along the perimeter of the cover connecting portion (32) to prevent foreign substances from entering from the outside, and an extension portion (31b) that is vertically bent and extended from the end of the cover connecting portion (31a).

The above cover passage (32) is formed in a hollow cylinder shape so that the first connector (10) and the second connector (20) can pass through the inside, and convex portions (32a) and concave portions (32b) can be formed alternately on the inner and outer sides.

A convex portion (32a) and a concave portion (32b) are formed in the above cover passage portion (32), so that when an impact is received from the outside, the convex portion (32a) is pushed toward the concave portion (32b), thereby providing elasticity to alleviate the impact.

The above cover connecting portion (31a) is formed to have a flat or curved surface by extending horizontally outward along the perimeter of the cover passage portion (32).

The above extension portion (31b) is bent vertically from the end of the cover connection portion (31a) and extends toward the grounding switch terminal (2).

The above extension portion (31b) is formed to widen toward the cover connection portion (31a) at the end, so that it can wrap around the grounding switch terminal (2) corresponding to the width of the grounding switch terminal (2).

Although the present invention has been described in detail through specific examples, this is only for the purpose of specifically explaining the present invention, and the present invention is not limited thereto, and it is obvious that the present invention can be modified or improved by a person having ordinary knowledge in the relevant field within the technical spirit of the present invention.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be made clear by the appended claims.

1: Gas insulated switchgear
2: Grounding switch terminal
2a: Terminal body
2b: Terminal flange
2c: Terminal connector
2d: Terminal insertion groove
2e: Terminal fastening bolt
3: Lead Cable
3a : wire
3b: Cable protection cap
3c: Cable insertion groove
3d : lead terminal
10: 1st connector
11: 1st conductor section
12: Second conductor section
13 : The stumbling block
20: 2nd connector
21: Connector body
22: First conductor insertion part
22a: 1st conductor insertion groove
22b: 1st fixed ring
22c: 1st friction pad
22d: 1st insertion groove
22e: 2nd insertion groove
23: Second conductor insertion part
23a: Second conductor insertion groove
23b: 2nd fixed ring
23c: 2nd friction pad
23d: 3rd insertion groove
23e: 4th insertion groove
24 : Connector Conductor
30 : Insulating cover
31 : Cover body
31a: Cover connection part
31b : Extension
31c : Adhesive
32: Cover passage
32a : Concave
32b: Convex part

Claims (5)

A first connector including a first conductive part made of metal on one side and a second conductive part made of metal on the other side to be inserted into a grounding switch terminal of a gas-insulated switch; and
A second connector including a first conductor insertion portion having a first conductor insertion groove formed on one side to allow the second conductor portion to be inserted, and a second conductor insertion portion having a second conductor insertion groove formed on the other side to allow the lead cable to be inserted;
Including,
The above first connector,
A catch extending horizontally outwardly along the circumference of the first conductor portion so as to be inserted into and caught by the grounding switch terminal;
A safety connector for fault detection testing having a catch plate including:
In claim 1,
The above first conductor insertion part is,
A first friction pad inserted into a second insertion groove formed on an inner wall surface to prevent the second conductive portion inserted inside from coming off, and which comes into contact with the second conductive portion to provide frictional force;
A safety connecting member for fault detection testing, comprising a catch plate, characterized in that it further includes a.
In claim 1,
The above stumbling block is,
A safety connector for fault detection testing, having a catch plate characterized by having rounded outer edges.
In claim 1,
The above first conductor part,
A safety connecting member for a fault detection test, comprising a catch, characterized in that the width thereof is formed to correspond to the width of the terminal insertion groove so as to be inserted into the terminal insertion groove of the above-mentioned grounding switch terminal.
In claim 2,
The above first conductor insertion part is,
A first fixing ring inserted into a first insertion groove formed on an inner wall surface to pressurize the second conductor portion inserted inside;
A safety connecting member for fault detection testing, comprising a catch plate, characterized in that it further includes: