KR101666771B1

KR101666771B1 - A Polymer Cut Out Switch Being Capable of Relaxing Electric Field

Info

Publication number: KR101666771B1
Application number: KR1020160033223A
Authority: KR
Inventors: 송기현
Original assignee: 송기현
Priority date: 2016-03-21
Filing date: 2016-03-21
Publication date: 2016-10-14

Abstract

The present invention relates to a polymer cut-out switch, and more particularly, to a polymer cut-out switch that separates insulator insulators into a first insulator insulator and a second insulator insulator, thereby reducing the volume and reducing the defective insulator insulator. And a fixing metal that is formed of a metal between the first insulation insulator and the second insulation insulator so as to contribute to the improvement of the productivity of the insulation insulator and the reduction of the operation and maintenance cost, Separates the first insulation insulator and the second insulation insulator and exposes the insulation insulator to the outside, thereby achieving a shielding effect of the electric field to alleviate the ambient electric field, thereby increasing the flashover voltage and improving the electrical insulation performance. .

Description

[0001] The present invention relates to a polymer cutout switch capable of attenuating an electric field,

The Cut Out Switch is a type of overcurrent breaker. It is installed on the branch line, MOP primary side, PT primary side, and primary side of the transformer. It is opened quickly in case of accident and prevents overcharging. And overload accidents. In addition, the cut-out switch is used for emergency faults such as accident caused by overcurrent or short-circuit current of transformer, ground fault of high-voltage and high-voltage bus, ground fault of instrumental transformer, etc.

In recent years, a polymer cutout switch using an insulating housing made of a polymer material has become common as in the following patent documents. The conventional polymer cutout switch has an upper electrode 100 connected to the lead wire of a power line, A support insulator 300 formed between the upper electrode 100 and the lower electrode 400 and having an insulation performance and a support insulator 300 formed on the support insulator 300 to connect the cut- And a fixed support 200 fixed to the pole.

However, in the conventional polymer cut-out switch, the insulation property of the supporting insulator 300 is broken, leading to accidents to the transformer and the distribution line. This is because of the electric field concentration phenomenon of the fixed support 200 and the upper electrode 100, The inequality of electric field is deepened and island lock is generated, and the inequality field is further intensified due to the influence of surrounding gold deterioration and electric wire, leading to failure of the product.

Therefore, in recent years, quality of cut-out switches has become more important and attempts to detect design and fabrication defects have continued. KEPCO has added quality degradation tests and moisture penetration tests More strictly. The water penetration test is a test to judge the defect of insulating material. It is a test to determine whether there is an abnormality by boiling water for a certain period of time, and then it is determined by a quasi-wave test and an electric voltage test. As shown in FIG. 1, the steep wave test is a very severe test in which a voltage of 1000 kV is applied within 1 microsecond. As shown in FIG. 1, the electric field concentration phenomenon occurs in the upper electrode 100 and the fixed support 200, Therefore, the test was not passed frequently.

Therefore, the development of a polymer cutout switch with a new structure that can pass the quality test of the harsh polymer cutout switch by improving the insulation performance by increasing the flashover voltage by alleviating the electric field concentration phenomenon of the polymer cutout switch Is required.

(Patent Literature)

Public Utility Model Publication No. 20-2012-0004562 (published on June 26, 2012) "Integrated polymer cutout switch"

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

The present invention separates insulator insulators into a first insulator insulator and a second insulator insulator to reduce the volume and reduce the defective insulators formed by injection molding and extrusion molding, It is an object of the present invention to provide a polymer cutout switch capable of preventing the occurrence of breakage and flashover, improving the productivity of insulated insulators, and reducing the operation and maintenance cost.

The present invention includes a fixing metal formed of a metal between a first insulation insulator and a second insulation insulator, wherein the fixing metal separates the first insulation insulator and the second insulation insulator and is completely exposed to the outside, To thereby bring about a reduction in the peripheral electric field, thereby enhancing flashover voltage, thereby achieving improved electrical insulation performance.

The present invention is characterized in that the lower support bracket in contact with the fuse holder includes a rounded receiving portion formed by bending the upper end of the lower support bracket in an upward direction and a guide ring for guiding the fuse folder is received in the rounded receiving portion, It is an object of the present invention to provide a polymer cutout switch capable of mitigating an electric field concentrated at a connection portion of a guide ring, thereby increasing the flashover voltage and enhancing mechanical coupling force.

In order to achieve the above object, the present invention is implemented by the following embodiments.

According to an embodiment of the present invention, a polymer cut-out switch according to the present invention includes an insulation insulator formed of an insulator made of a polymer material, a fixing metal fixed to the electric wire in combination with the insulation insulator, A lower terminal formed on a lower portion of the insulator, and a fuse holder formed between the upper terminal and the lower terminal and having a fuse, wherein the insulator includes a first insulator formed on an upper portion thereof, And the fixing metal is formed between the first insulation insulator and the second insulation insulator so as to separate the first insulation insulator and the second insulation insulator and is fully exposed to the outside.

According to another embodiment of the present invention, in the polymer cutout switch according to the present invention, the fixing metal is formed of a metal material.

According to another embodiment of the present invention, there is provided a polymer cutout switch according to the present invention, wherein the fixing metal member includes an exposed portion which is inserted between the first insulating insulator and the second insulating insulator and which is exposed to the outside, And a fastening part formed to protrude up and down and inserted and fastened to the first insulative insulator and the second insulative insulator, respectively.

According to another embodiment of the present invention, in the polymer cut-out switch according to the present invention, the upper terminal includes an upper electrode plate to which a lead wire coming from a power line is connected; An upper and a lower support bracket supporting the upper electrode plate and engaging with the insulator; An elastic body formed between the upper electrode plate and the upper support bracket to provide restoring force to the upper electrode plate by elasticity; And a guide ring formed to protrude from the lower support bracket to both sides of the fuse holder to guide the fuse folder. The lower support bracket includes a rounded receiving portion bent upward from the end of the lower support bracket, And the ring is received and coupled to the rounded receiving portion.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

The present invention separates insulator insulators into a first insulator insulator and a second insulator insulator to reduce the volume and reduce the defective insulators formed by injection molding and extrusion molding, It is possible to prevent the occurrence of breakage and flashover, to improve the productivity of the insulator, and to contribute to the reduction of the operation and maintenance cost.

The present invention includes a fixing metal formed of a metal between a first insulation insulator and a second insulation insulator, wherein the fixing metal separates the first insulation insulator and the second insulation insulator and is completely exposed to the outside, Thereby improving the electric insulation performance by increasing the flashover voltage.

The present invention is characterized in that the lower support bracket in contact with the fuse holder includes a rounded receiving portion formed by bending the upper end of the lower support bracket in an upward direction and a guide ring for guiding the fuse folder is received in the rounded receiving portion, It is effective to increase the flashover voltage and to strengthen the mechanical coupling force by reducing the electric field concentrated at the connection portion of the guide ring.

1 is a cross-sectional view showing a conventional polymer cutout switch
2 is a perspective view of a polymer cutout switch according to an embodiment of the present invention.
Fig. 3 is an exploded perspective view of Fig.
4 is a reference diagram for explaining the operating state of FIG.
Fig. 5 is a front view of Fig. 2
6 is a photograph showing a coupling structure of a conventional lower support bracket and a guide ring

Hereinafter, preferred embodiments of a polymer cutout switch capable of mitigating an electric field according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Throughout the specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

2 to 5, the polymer cut-out switch includes an insulation insulator 1 formed of an insulator made of a polymer material, A lower terminal 4 formed at a lower portion of the insulation insulator 1 and a lower terminal 2 formed at a lower portion of the insulation insulator 1; And a fuse holder 5 formed between the upper terminal 3 and the lower terminal 4 and incorporating a fuse.

In general, the polymer cut-out switch is installed between the high-voltage power line installed on the pole and the pillar transformer to prevent accidents caused by overcurrent, overload, etc., and to prevent the operator from working in safe operation. The insulating insulator 1 is fixed to the base metal by the fixing metal 2 and the upper terminal 3 formed on the insulating insulator 1 is connected to the lead wire of the power line, 4), the lead wire leading to the pillar transformer is connected. The fuse holder 5 is formed to be rotatable about the lower terminal 4 between the upper terminal 3 and the lower terminal 4 and the fuse inside the fuse holder 5 is cut off by an overcurrent or the like 4, the fuse holder 5 is rotated in the direction of the arrow and the electric current is interrupted. During the maintenance work, the worker artificially rotates the fuse holder 5 in the direction of < RTI ID = 0.0 > .

Therefore, the insulation performance of the insulation insulator 1 is more important than anything. When the insulation performance of the insulation insulator 1 is lowered or the electric field is concentrated on the upper terminal 3 or the fixing metal fins 2, If a lock occurs, it will lead to insulation breakdown, resulting in product failure and accidents. In addition, the conventional insulation insulator made of an insulator of polymer is formed integrally to exhibit a high rate of molding defects, thereby deteriorating the insulation performance of the insulation insulator 1 and causing a trouble, resulting in an increase in cost.

Therefore, in the present invention, the insulation insulator 1 is formed by separating the first insulation insulator 11 and the second insulation insulator so as to reduce the defective molding rate of the insulation insulator 1 manufactured by injection molding and extrusion molding , A metal fixing metal (2) separates the first insulation insulator and the second insulation insulator from each other and exposes the insulation insulator completely to the outside, thereby shielding the electric field, thereby alleviating the surrounding electric field So that the flashover voltage is increased to improve the insulation performance.

The insulation insulator (1) is provided on an electric wire of the electric pole through the fixing metal (2) so that the cutout switch can be fixed, and a core for maintaining the strength of FRP or the like and silicone rubber surrounding it, Rubber or the like so that the insulation can be made. However, since the insulation insulator 1 is formed in the shape of a cap to increase the leakage distance and the flashover distance, the molding defect rate is inevitably high. As a result, the insulation performance of the insulation insulator 1 is deteriorated and the cost due to frequent failure increases The insulation insulator 1 is divided into the first insulation insulator 11 and the second insulation insulator 12 so as to reduce the volume of each insulator 1 and to reduce the defective molding rate do. In addition, since the insulation insulator 1 is divided into two, the productivity is increased. In addition, even when the insulation insulator 1 is damaged, the damaged insulation insulator 1 can be replaced. In addition, between the first insulation insulator 11 and the second insulation insulator 12, the fixing metal 2 is formed to completely protrude outward so as to provide an electric field relaxation effect.

The first insulating insulator 11 is an insulating insulator 1 formed on the upper side and the upper terminal 3 is fixedly connected to an upper end and a lower connecting groove 111 is formed at a lower end to insulate the fixing insulator . The lower fastening groove 111 is formed upwardly from the lower end of the first insulating insulator 11 and is fastened to the inner side of the fixing bracket 2 so that the fastening portion 22, Can be formed.

The second insulator 12 is an insulating insulator 1 formed on the lower side and the lower terminal 4 is fixedly coupled to the lower end and an upper fastening groove 121 is formed on the upper end, . The upper fastening groove 121 is formed so as to extend downward from the upper end of the second insulative insulator 12 and is fastened to the inside of the fastening fastening portion 2 so that the fastening portion 22, Can be formed.

The fixing bracket 2 is formed between the first insulation insulator 11 and the second insulation insulator 12 so as to be fixedly connected to the front electrode of the electric pole so that the cutout switch can be fixed to the pole. Particularly, the fixing metal 2 is inserted between the first insulation insulator 11 and the second insulation insulator 12 which are completely separated from each other, and is formed of a metal material so as to be completely exposed to the outside. Therefore, unlike the prior art, the fixing bracket 2 is not inserted into the insulator or coupled to the outside of the insulator but inserted between the completely insulated insulators 1 to be completely exposed to the outside, So that the peripheral electric field is relaxed, thereby increasing the flashover voltage, thereby preventing flashover, thereby improving the insulation performance. 3, the fixing metal member 2 includes an exposed portion 21 formed between the first insulating insulator 11 and the second insulating insulator 12 and exposed to the outside, And a fastening part 22 formed to protrude above and below the first insulator 11 and the second insulator 12 to be inserted into and fastened to the first insulator 11 and the second insulator 12.

The exposed portion 21 is completely separated from the first insulation insulator 11 and the second insulation insulator 12 and is exposed to the outside to provide an electric field relaxation effect so as to alleviate the surrounding electric field.

The fastening part 22 protrudes from the upper and lower sides of the exposed part 21 and is coupled to the first insulator 11 and the second insulator 12. The first insulator 11, And the second insulation insulator 12 to be fastened. The fastening part 22 includes a first fastening part 221 projecting upward and a second fastening part 222 projecting downward.

The first fastening part 221 protrudes upward from the exposed part 21 and is inserted into the lower fastening groove 111 of the first insulator 11 so that a thread can be formed have.

The second fastening part 222 protrudes to the lower side of the exposed part 21 and is inserted into the upper fastening groove 121 of the second insulative fastener 12 so that a thread can be formed have.

The upper terminal 3 is coupled to the upper end of the insulation insulator 1 or more precisely to the first insulation insulator 11 and is connected to the lead wire of the power line and the fuse holder 5 is connected to one side . The upper terminal 3 includes an upper electrode plate 31 to which a lead wire coming from a power line is connected; Upper and lower support brackets 34 for supporting the upper electrode plate 31 and engaging with the insulator 1; An elastic body 33 formed between the upper electrode plate 31 and the upper support bracket 32 to provide an elastic restoring force to the upper electrode plate 31; And a guide ring 35 protruding from the lower support bracket 34 to both sides of the fuse holder 5 and guiding the fuse holder 5.

The upper electrode plate 31 is supported by the upper support bracket 32 and the lower support bracket 34 and is brought into contact with the fuse holder 5 by receiving a resilient restoring force from the elastic body 33, And is transmitted to the lower terminal 4 and the pillar-shaped transformer through the fuse holder 5. The pillar-

The upper support bracket 32 is engaged with the upper electrode plate 31 and the lower support bracket 34 and an elastic body 33 is formed between the upper support plate 32 and the upper electrode plate 31, .

The elastic member 33 is formed and supported between the upper support bracket 32 and the upper electrode plate 31. The fuse holder 5 is in contact with the upper electrode plate 31 to form the upper electrode plate 31, The upper electrode plate 31 is pushed downward by a restoring force due to elasticity so that the upper electrode plate 31 and the fuse holder 5 can be stably contacted.

The lower support bracket 34 is coupled to the upper electrode plate 31 and the upper support bracket 32 and also to the first insulation insulator 11. The lower support bracket 34 guides the fuse holder 5 by forming a guide ring 35 on both sides of the fuse holder 5 at an end thereof. Therefore, when the fuse holder 5 rotates about the lower terminal 4, the fuse holder 5 is accurately supported by the lower support bracket 34 so that the fuse holder 5 and the upper electrode plate 31 can be brought into contact with each other . 6, the lower support bracket 34 and the guide ring 35 are simply coupled by welding or the like so that the edge of the lower support bracket 34, the lower support bracket 34, The electric field is concentrated at the contact point of the contact portion 35. Especially, in the case of performing a quasi-wave experiment or the like, it is frequently observed that the quality of the cut-out switch is judged to be defective due to the fact that the electric field is concentrated and the island lock is generated. Therefore, in the present invention, the lower support bracket 34 includes a rounded receiving portion 341 which is bent upward to the upper end, so that the guide ring 35 is received and coupled to the rounded receiving portion 341, To reduce the concentration phenomenon.

The rounded receiving portion 341 is formed to extend from the end of the lower support bracket 34 and is bent upwardly. The rounded receiving portion 341 is formed horizontally with the insulator 1 to insulate the fuse holder 5 The lower supporting bracket 34 supporting the insulator 1 in a horizontal direction has the round receiving portion 341 at its end to eliminate the corners where the electric field is concentrated and to reduce the electric field to increase the flashover voltage, Thereby preventing formation of a spot where the electric field can be concentrated for connection with the ring 35. [ The round receiving portion 341 accommodates the guide ring 35 and fixes the guide ring 35 by welding or brazing so as to strengthen the fixing force of the guide ring 35. Accordingly, 5 so that the guide ring 35 can be stably fixed.

The guide ring 35 is formed to protrude from the lower support bracket 34 to both sides of the fuse holder 5 so that the rotating fuse holder 5 is guided by the guide ring 35, So that it can be brought into contact with the electrode plate 31. The guide ring 35 is accommodated in the round receiving portion 341 as described above to improve the mechanical coupling force and prevent the electric field from being concentrated.

The lower terminal 4 is connected to the insulation insulator 1, or more precisely, to the lower end of the second insulation insulator, and is connected to a lead wire leading to the pillar-type transformer. The fuse holder 5 is rotatably coupled, To be opened and closed.

The fuse holder 5 is connected between the upper terminal 3 and the lower terminal 4 and is rotatably connected to the lower terminal 4. An upper electrode plate 31 is connected to the upper terminal 3, As shown in Fig. A fuse is provided in the fuse holder 5, and when an excessive current flows, the fuse is blown, and accordingly, the fuse holder 5 is automatically rotated in the @ direction to cut off the converter. Further, during maintenance, an operator artificially cuts off the converter by rotating the fuse holder 5 in the @ direction using the fixing hook 51. [

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.

1: Insulation insulator
11: first insulator 111: lower fastening groove
12: second insulating insulator 121: upper fastening groove
2: Fixing bracket
21:
22: fastening part 221: first fastening part 222: second fastening part
3: upper terminal
31: upper electrode plate 32: upper support bracket 33: elastic body
34: Lower support bracket 341: Rounding accommodating part
35: Guide ring
4: Lower terminal
5: Fuse holder 51: Retaining ring

Claims

An insulator formed of an insulator made of a polymer material; a fixing metal fixed to the electric wire in association with the insulator; an upper terminal formed on an upper portion of the insulator; a lower terminal formed on a lower portion of the insulator; A polymer cut-out switch comprising a fuse holder formed between terminals and having a built-in fuse,
Wherein the insulator includes a first insulator formed on the upper portion and a second insulator formed on the lower portion,
The fixing metal is formed between the first insulation insulator and the second insulation insulator so that the first insulation insulator and the second insulation insulator are separated from each other and are completely exposed to the outside and are formed of a metal material. An exposed portion inserted between the second insulating insulators and exposed to the outside and a fastening portion formed to protrude above and below the exposed portion and inserted and fastened to the first insulative insulator and the second insulated insulator respectively,
Wherein the first insulating insulator includes a lower engaging groove formed by being embedded upward at a lower end thereof,
Wherein the second insulating insulator includes an upper fastening groove formed to be embedded in a lower portion at an upper end thereof,
Wherein the fastening portion includes a first fastening portion protruding upward from the exposed portion and inserted and fastened to the lower fastening groove and a second fastening portion protruding downward from the exposed portion to be inserted and fastened into the upper fastening groove,
The upper terminal includes an upper electrode plate to which a lead wire connected to a power line is connected; An upper and a lower support bracket supporting the upper electrode plate and engaging with the insulator; An elastic body formed between the upper electrode plate and the upper support bracket to provide restoring force to the upper electrode plate by elasticity; And a guide ring protruding from both sides of the fuse holder from the lower support bracket and guiding the fuse holder,
Wherein the lower support bracket includes a rounded receiving portion bent upward from the end of the lower support bracket so that the guide ring is received and engaged with the rounded receiving portion.

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