KR20230010514A - Safety joint for detecting fault position of underground transmission line - Google Patents

Abstract

The present invention relates to a safe connection member for a detection test of a fault point of an underground transmission line. The present invention comprises: a first connector including a first conductor part made of metal on one side and a second conductor part made of metal on the other side to be inserted into grounding switch terminals of a gas-insulated switchgear; and a second connector including a first conductor insertion part having a first conductor insertion groove for the second conductor part to be inserted thereinto and a second conductor insertion part having a second conductor insertion groove formed on the other side so that a lead cable is inserted thereinto. Accordingly, test cables can be reliably connected to grounding switch terminals of various sizes so as to secure an insulation distance when applying a high-voltage test voltage and fault point detection testing can be accurately performed through the development of a dedicated connection member.

Description

Safety connection material for fault point detection test of underground transmission line {SAFETY JOINT FOR DETECTING FAULT POSITION OF UNDERGROUND TRANSMISSION LINE}

The present invention relates to a safety connector for detecting a fault point of an underground transmission line, and more particularly, to a gas insulated switchgear to detect a fault point of an underground transmission line coupled to an earthing switch. Provide safety connectors for detection tests.

In general, substations are divided into outdoor substations and indoor substations depending on the installation location. In the suburbs where the building density per unit area of the site is low, it is economically advantageous to sufficiently separate the elements and lines, so the cost is low and the installation is easy. An outdoor substation is installed on the field.

However, in urban areas where the building density per unit area of the site is high, it is economically advantageous to sufficiently insulate between elements and lines, so a gas insulated switchgear (GIS) type indoor substation is installed.

Gas insulated switchgear is used in facilities where high-voltage current flows and is used to protect the power system by safely opening and closing lines when an abnormality such as an accident or short circuit occurs out of the normal state. , Circuit Breaker (CB), Disconnecting Switch (DS), Earthing Switch (ES), Lightning Arrester, etc., filled with SF ₆ gas, an inert gas with excellent insulation performance, inside It promotes miniaturization and safety of substations.

In order to control the operation of the gas insulated switchgear, a control panel is essential, and the control panel controls the operation of the gas insulated switchgear by means of an electrical signal or mechanical movement.

On the other hand, this gas insulated switchgear guarantees the stability of the product by applying a voltage of 50,000 to 70,000V and performing a withstand voltage test to test whether it can withstand for 1 minute, and prevents electrical accidents due to failure through continuous monitoring. should be prevented

However, in the process of applying test power to detect the fault point of the cable by combining it with the connection material connected to the grounding switch, the test terminal is absent and the cable extension connected to the measuring equipment is unstable, leading to electric shock or fire. Danger exists.

Korean Registered Patent Publication No. 10-1522271

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

In order to achieve the above object, the safety connection material for the fault point detection test of the underground transmission line according to an embodiment of the present invention is a first electrode made of metal on one side to be inserted into the ground switch terminal of the gas insulated switchgear. A first connector including a second electrode portion made of metal on the other side and the first connector; and a second connector including a first electrode insertion portion having a first electrode insertion groove into which the second electrode portion is inserted, and a second electrode insertion portion having a second electrode insertion groove formed on the other side of which a lead cable is inserted.

The first connector may further include a locking step extending horizontally outward along the circumference of the first conductor portion so as to be inserted into and caught in the ground switch terminal.

The locking jaw may have a rounded outer edge.

The first conductor portion may have a width corresponding to the width of the terminal insertion groove so as to be inserted into the terminal insertion groove of the ground switch terminal.

The first conductor insertion part may further include a first fixing ring inserted into a first fitting groove recessed into an inner wall surface to press the second conductor part inserted inside.

The first conductor insertion part is inserted into a second fitting groove recessed into an inner wall surface to prevent the second conductor part inserted inside from being separated, and further includes a first friction pad that is in contact with the second conductor part and provides frictional force. can include

The second conductor insertion unit may further include a second fixing ring inserted into a third fitting groove recessed into an inner wall surface to press the lead cable inserted therein.

The second conductor insertion part may further include a second friction pad that is inserted into a fourth fitting groove concavely formed on an inner wall surface to prevent the lead cable inserted therein from being separated, and generates frictional force in contact with the lead cable. can

In addition, the safety connector for the fault point detection test of the underground transmission line according to an embodiment of the present invention may further include an insulating cover that surrounds the first connector and the second connector from the outside.

The insulating cover includes a hollow cover passage to allow passage of the first connector and the second connector, a cover connection portion protruding outward along a circumference of the cover passage portion to prevent inflow of foreign matter from the outside, and an end of the cover connection portion. It may include an extension bent vertically in.

As described above, according to the safety connection material for the fault point detection test of the underground transmission line according to the present invention, the test cable can be stably coupled to the ground switch terminals of various sizes to ensure stability when the test voltage is applied. Therefore, it is possible to block noise generated from the connection part and obtain an improved fault diagnosis rate.

1 is a photograph viewed from the outside of a grounding switch included in a conventional gas insulated switchgear.
2 is a photograph of a state in which a test lead cable is connected to test a grounding switch included in a conventional gas insulated switchgear from the outside.
3 is a partially broken perspective view in which a part of an insulating cover is broken to show a safety connection material for a fault point detection test of an underground transmission line according to an embodiment of the present invention from the outside.
4 is an exploded perspective view showing a safety connection material for a fault point detection test of an underground transmission line according to an embodiment of the present invention disassembled by component.
5 is a cross-sectional view showing a cross section of a safety connection member for a fault point detection test of an underground transmission line according to an embodiment of the present invention.
6 is a cross-sectional view showing a cross section of a ground switch terminal into which a test terminal of a gas insulated switchgear provided by the present invention is inserted.
7 is a cross-sectional view showing a cross section of a lead cable connected to a safety connector for a fault point detection test of an underground transmission line provided by the present invention.
8 is a cross-sectional view showing different widths of conductor members in a first connector of a safety connector for a fault point detection test of an underground transmission line according to an embodiment of the present invention.
9 is a cross-sectional view showing a cross section of a second connector of a safety connector for a fault point detection test of an underground transmission line according to an embodiment of the present invention.
10 is a cross-sectional view of an insulating cover of a safety connection material for a fault point detection test of an underground transmission line according to an embodiment of the present invention.

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

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be construed as including all changes, equivalents, or substitutes included in the spirit and technical scope of the present invention.

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

The term "and/or" may include any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. can be understood On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it may be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise" or "having" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features It may be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries may be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, interpreted in an ideal or excessively formal meaning. It may not be.

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

Referring to FIG. 1, a load break switchgear has been developed and used so that it can be used for branching, classification, testing and maintenance of high-voltage distribution lines, and since the handling voltage is high, each switchgear has electrical insulation performance. It has a structure installed in a container in which an insulating gas such as excellent sulfur hexafluoride (SF ₆ ) gas is sealed.

A lead extended from the voltage application device as shown in FIG. 2 to inspect the insulation state under high voltage condition at the earth switch terminal (2) located on the side of the gas insulated switchgear (1) that insulates the high voltage switchgear using gas. The test is performed by inserting the cable 3 and applying a high voltage (0.5 to 9 kV).

However, when the lead cable 3 is directly inserted into the ground switch terminal 2, the connection part is unstable due to different standards for each manufacturer, so there is a possibility of a safety accident due to the application of high voltage.

In order to solve the above problems, referring to FIGS. 3 and 4, the safety connection material for the fault point detection test of the underground transmission line according to an embodiment of the present invention is the ground of the gas insulated switchgear (1). A first connector 10 including a first conductor portion 11 made of a metal material on one side and a second conductor portion 12 made of a metal material on the other side to be inserted into the switch terminal 2, and the second conductor portion 12 ) is inserted into the first conductor insertion part 22 having the first conductor insertion groove 22a formed therein and the second conductor insertion part 23 having the second conductor insertion groove 23a formed on the other side into which the lead cable 3 is inserted. ) and a second connector 20 including a.

In detail, the ground switch terminal 2 of the gas insulated switchgear 1 has a columnar terminal body 2a coupled to the upper end of the main body of the gas insulated switchgear 1, and the circumference of the terminal body 2a. A terminal flange (2b) extending horizontally outward along the terminal flange (2b), a terminal connector (2c) inserted into and coupled to the inner surface of the terminal body (2a), and the terminal connector (2c) is concave in the center to form a first connector from the outside. (10) or the terminal insertion groove (2d) formed to allow the lead cable (3) to be inserted, and the terminal fastening bolt (2e) inserted into the main body of the gas insulated switchgear (1) through the terminal flange (2b). include

Referring to FIG. 6 , the terminal body 2a may be formed in the shape of a cylindrical column, a polygonal column, or a trapezoidal column, and a person skilled in the art may change the shape of the main body.

The terminal flange 2b may horizontally extend outward from the circumference of the terminal body 2a, or may extend to form a predetermined angle with the surface of the main body to reduce the space occupied by the main body.

The 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 move.

The terminal insertion groove 2d is concave at the center of the terminal connector 2c and may be formed in a cylindrical shape, a polygonal cylinder shape, etc. so that the lead cable 3 or the first connector 10 of the present invention can be inserted from the outside. .

Referring to FIG. 7, the lead cable 3 includes a wire 3a connected to a voltage applicator for applying a high voltage, a bar-shaped lead terminal 3d connected to an end of the wire 3a, and the lead terminal 3d. ) is formed to include a cable insertion groove 3c that is recessed in the center of the cable protection cap 3b and the cable insertion groove 3c into which the first connector 10 can be inserted.

The first connector 10 includes a first conductor portion 11 formed in a column shape made of a metal capable of conducting current on one side to be inserted into the ground switch terminal 2, and the second connector 20 on the other side. ) and a second conductor portion 12 formed in a columnar shape made of a metal material capable of conducting current so as to be inserted into the second conductor portion 12.

The first conductor portion 11 and the second conductor portion 12 may be formed in a cylindrical or polygonal column shape, and copper, tungsten, or aluminum having excellent current conductivity may be used, and may be tested in an external environment. Aluminum with excellent corrosion resistance can be used.

The first conductor insertion part 22 is concave in the center so that the second conductor part 12 can be inserted, and the first conductor insertion groove 22a is formed, and is formed in a hollow cylindrical shape as a whole.

The second conductor insertion part 23 is concave in the center so that the lead cable 3 can be inserted from the outside, and the second conductor insertion groove 23a is formed to have a hollow cylindrical shape as a whole.

The first connector 10 extends outwardly horizontally along the circumference of the first conductor portion 11 in contact with the second conductor portion 12 so as to be inserted into the ground switch terminal 2 and caught. It further includes jaws 13.

Since the locking jaw 13 is caught while the first conductor part 11 is inserted into the ground switch terminal 2 and prevents the second conductor part 12 from being inserted together, the first conductor part 11 is prevented from being inserted together. The conductor portion 11 may move in a direction away from the ground switch terminal 2 .

The locking jaw 13 has a rounded outer corner, so noise generated by collision with the ground switch terminal 2 is reduced and foreign substances introduced from the outside are prevented from slipping and attaching.

The first conductor part 11 is formed such that the width of the main body corresponds to the terminal insertion groove 2d so as to be inserted into the terminal insertion groove 2d of the earth switch terminal 2, and the width varies by manufacturer. Prevents the lead cable (3) from shaking.

In other words, since the standard of the grounding switch terminal 2 of the gas insulated switchgear 1 varies for each manufacturer, a gap is generated between the terminal insertion groove 2d and the lead cable 3, so that foreign substances may flow in from the outside or high voltage To prevent a safety accident from occurring, the width of the first conductor part is formed to be the same as that of the terminal insertion groove 2d.

The first conductor insertion part 22 further includes a first fixing ring 22b inserted into the first fitting groove 22d formed concave on the inner wall surface to press the second conductor part 12 inserted inside. can do.

The first fixing ring 22b is inserted into the first fitting groove 22d formed by being recessed in the inner wall of the first conductor insertion part 22, and the second conductor part 12 inserted from the outside Pressurize to block the gap.

The first fixing ring 22b is formed of a rubber material having excellent insulating properties, including polyethylene or polypropylene, and allows the second conductor part 12 to come into close contact with the first conductor insertion part 22 by an elastic force.

The first conductor insertion part 22 is inserted into the second fitting groove 22e concavely formed on the inner wall surface to prevent the second conductor part 12 inserted inside from being separated, and the second conductor part ( 12) may further include a first friction pad 22c generating frictional force in contact with the first friction pad 22c.

The first friction pad 22c is inserted into the second fitting groove 22e formed by being recessed in another inner wall surface of the first conductor insertion part 22, and the second conductor part 12 inserted from the outside. ) to provide frictional force.

Since the surface of the first friction pad 22c comes into contact with the second conductor part 12 to provide frictional force, the second conductor part 12 slides away from the first conductor insertion part 22 and is removed. prevent that

A surface of the first friction pad 22c may include a plurality of protrusions protruding to improve frictional force.

In addition, the second conductor insertion part 23 may further include a second fixing ring 23b inserted into the third fitting groove 22d recessed on the inner wall so as to press the lead cable 3 inserted therein. can

The second fixing ring 23b is inserted into the third fitting groove 23d formed by being recessed in the inner wall of the second conductor insertion part 23, and pressurizes the lead cable 3 inserted from the outside. close the gap

The second fixing ring 23b is formed of a rubber material having excellent insulating properties, including polyethylene or polypropylene, so that the lead cable 3 adheres to the second conductor insertion part 23 by an elastic force.

The second conductor insertion part 23 is inserted into the fourth fitting groove 22e recessed on the inner wall surface to prevent the lead cable 3 inserted inside from being separated, and is in contact with the lead cable 3. It may further include a second friction pad 23c that generates frictional force.

The second friction pad 23c is inserted into the fourth fitting groove 23e formed by being recessed in another inner wall surface of the second conductor insertion part 23, and is inserted into the lead cable 3 inserted from the outside. It comes into contact and provides frictional force.

Since the surface of the second friction pad 23c comes into contact with the lead cable 3 to provide frictional force, the lead cable 3 is prevented from slipping away from the second conductor insertion portion 23 and being removed.

A surface of the second friction pad 23c may include a plurality of protrusions protruding to improve frictional force.

In addition, the safety connection material for the fault point detection test of the underground transmission line according to an 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. include

The insulating cover 30 has a hollow cover passage portion 32 to allow the first connector 10 and the second connector 20 to pass through, and the cover passage portion 32 to prevent the inflow of foreign matter from the outside. It includes a cover connection portion 31a protruding outward along the circumference of the cover and an extension portion 31b bent and extended vertically from an end of the cover connection portion 31a.

The cover passage part 32 is formed in the shape of a cylinder including a hollow so that the first connector 10 and the second connector 20 can pass therein, and has convex parts 32a and concave inside and outside. Sections 32b may be alternately formed.

A convex portion 32a and a concave portion 32b are formed in the cover passage 32 so that when an external impact is received, the convex portion 32a is extruded toward the concave portion 32b to provide elastic force to alleviate the impact. can

The cover connection portion 31a extends horizontally outward along the circumference of the cover passage portion 32 to have a flat or curved surface.

The extension part 31b is bent vertically at the end of the cover connection part 31a and extends toward the ground switch terminal 2 .

The extension part 31b is formed to widen toward the cover connection part 31a at the end, and is formed to cover the ground switch terminal 2 corresponding to the width of the ground switch terminal 2.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and the present invention is within the technical spirit of the present invention. It is clear that modification or improvement is possible by the person.

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 clarified by the appended claims.

1: Gas insulated switchgear
2: Earth switch terminal
2a: terminal body
2b: terminal flange
2c: terminal connector
2d: terminal insertion groove
2e: terminal fastening bolt
3: lead cable
3a: wires
3b: cable protection cap
3c: cable insertion groove
3d: lead terminal
10: first connector
11: first conductor part
12: second conductor part
13: snag
20: second connector
21: connector body
22: first conductor insertion part
22a: first conductor insertion groove
22b: first fixing ring
22c: first friction pad
22d: first fitting groove
22e: second fitting groove
23: second conductor insertion part
23a: second conductor insertion groove
23b: second fixing ring
23c: second friction pad
23d: third fitting groove
23e: 4th fitting groove
24: connector conductor
30: insulation cover
31: cover body
31a: cover connection
31b: extension
31c: close contact
32: cover passage
32a: concave portion
32b: convex portion

Claims (10)

A first connector including a first conductor part made of metal on one side and a second conductor part made of metal on the other side to be inserted into the ground switch terminal of the gas insulated switchgear; and
a second connector including a first conductor insertion part having a first conductor insertion groove into which the second conductor part is inserted, and a second conductor insertion part having a second conductor insertion groove formed on the other side into which a lead cable is inserted;
Safety connection material for fault point detection test of underground transmission line including
The method of claim 1,
The first connector,
a locking step extending horizontally outward along the circumference of the first conductor portion so as to be inserted into and caught in the ground switch terminal;
Safety connection material for fault point detection test of underground transmission line further comprising.
The method of claim 2,
The stumbling block,
Safety connection material for fault point detection test of underground transmission line, characterized in that the outer corner is formed to be rounded.
The method of claim 1,
The first conductor part,
A safety connection material for a fault point detection test of an underground transmission line, characterized in that the width is formed to correspond to the width of the terminal insertion groove to fit into the terminal insertion groove of the earth switch terminal.
The method of claim 2,
The first conductor insertion part,
a first fixing ring inserted into a first fitting groove concavely formed on an inner wall surface to press the second conductor portion inserted inside;
Safety connection material for the fault point detection test of the underground transmission line, characterized in that it further comprises.
The method of claim 2,
The first conductor insertion part,
a first friction pad that is inserted into a second fitting groove formed concave on an inner wall surface to prevent the second conductor unit inserted inside from being separated, and provides frictional force by being in contact with the second conductor unit;
Safety connection material for the fault point detection test of the underground transmission line, characterized in that it further comprises.
The method of claim 2,
The second conductor insertion part,
A second fixing ring inserted into a third fitting groove concavely formed on an inner wall surface to press the lead cable inserted into the inner side;
Safety connection material for the fault point detection test of the underground transmission line, characterized in that it further comprises.
The method of claim 2,
The second conductor insertion part,
a second friction pad inserted into a fourth fitting groove recessed on an inner wall surface to prevent the lead cable inserted inside from being separated, and generating frictional force by contacting the lead cable;
Safety connection material for the fault point detection test of the underground transmission line, characterized in that it further comprises.
The method of claim 1,
an insulating cover surrounding the first connector and the second connector from the outside;
Safety connection material for fault point detection test of underground transmission line further comprising.
The method of claim 9,
The insulating cover,
a hollow cover passage through which the first connector and the second connector pass; and
a cover connection part protruding outward along the circumference of the cover passage part and an extension part bent and extended vertically from an end of the cover connection part to prevent the inflow of foreign matter from the outside;
Safety connection material for fault point detection test of underground transmission line including

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