KR20210123095A - Circuit breaker - Google Patents

Abstract

The present invention provides a circuit breaker which includes: an opposing contact part and a movable contact part disposed to face each other and electrically connected or separated; a first support part supporting the opposing contact part and has at least a portion composed of a conductor; a second support part supporting the movable contact part and has at least a portion composed of a conductor; and an insulating tube disposed between the first support part and the second support part, wherein the opposing contact part is disposed on one inner side of the insulating tube, and the movable contact part is disposed on the other inner side thereof. The first support part is configured to include a first coupling part coupled to one cross section of the insulating tube, and a first electric field alleviation part extended from the first coupling part to the other outer side of the insulating tube. The first electric field alleviation part is configured to include a first inner diameter part and a second inner diameter part extended to the other side by a predetermined length while the inner diameter thereof is greater than the outer diameter of the insulating tube and the inner diameter is kept constant. The second inner diameter part is formed on the other side of the first inner diameter part, and has an inner diameter larger than that of the first inner diameter part. Accordingly, the present invention can improve insulation performance of a triple point portion of the circuit breaker which has an insulating tube installed easily at low cost.

Description

Circuit Breaker {CIRCUIT BREAKER}

The present invention relates to a circuit breaker, and more particularly, to a circuit breaker for improving the insulation performance of the triple point portion of the insulating tube for a circuit breaker having an insulating tube installed therein.

Gas Insulated Switchgear is installed in each substation to stably supply the electricity produced by the power plant to the general consumers.

In general, a gas insulated switchgear is installed between the circuit between the power supply side and the load side of an electrical system, and when artificially opening and closing the circuit under normal current conditions, or when abnormal currents such as ground faults or short circuits occur in the circuit It is an electrical device that protects the power system and load equipment by safely shutting off

Such gas insulated switchgear is generally composed of a bushing unit, a circuit breaker (CB), a disconnector switch, an earthing switch, a movable part, a control unit, etc., and sulfur hexafluoride gas (SF6) It is configured to withstand the system voltage by using an insulating gas such as

Here, the circuit breaker is insulated to have withstand voltage performance in closed and open pole states. For example, an insulating tube is installed between the support part for supporting the fixed electrode contact and the movable electrode contact of a circuit breaker, and insulation between the inside and the outside of the insulation tube is achieved, thereby improving the withstand voltage performance.

However, the electric field is concentrated at the triple point where three types of materials having different physical properties of the support (conductor), the insulating tube (insulating material) and the insulating gas (eg, sulfur hexafluoride gas) meet, resulting in dielectric breakdown. Accordingly, a design that alleviates the electric field concentration in the triple point portion is required.

In particular, since the use of sulfur hexafluoride gas is restricted due to the side effect of aggravating global warming, and it is being replaced with an insulating gas with low insulation performance, a design that alleviates the concentration of the electric field is required.

The related prior art is as follows.

Korean Patent Registration No. 10-0952686 relates to a circuit breaker of a gas insulated switchgear, and is characterized in that it improves the electrical withstand voltage performance of the circuit breaker by providing an electric field alleviating electrode.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a circuit breaker that improves the insulation performance of the triple point portion of the insulation tube easily at low cost for the circuit breaker installed with the insulation tube.

In order to solve the above problems, the present invention provides an opposing contact portion and a movable contact portion disposed opposite to each other and electrically connected or separated; a first support part supporting the opposing contact part and at least a part of which is made of a conductor; a second support part supporting the movable contact part and at least a part of which is made of a conductor; and an insulating tube disposed between the first support part and the second support part, the opposing contact part is disposed on one inner side, and the movable contact part is disposed on the other inner side.

The first support portion is configured to include a first coupling portion coupled to one end surface of the insulator, and a first electric field mitigating portion extending from the first coupling portion to the outside of the insulation tube, or the second support portion is the insulation It is configured to include a second coupling portion coupled to the other end face of the tube and a second electric field alleviation portion extending from the second coupling portion to an outer side of the insulating tube.

The first electric field alleviation unit is configured to include a first inner diameter portion and a second inner diameter portion extending to the other side by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube and the inner diameter is kept constant.

The second inner diameter portion is formed on the other side of the first inner diameter portion and has a larger inner diameter than the first inner diameter portion.

The second electric field alleviation unit is configured to include a third inner diameter portion and a fourth inner diameter portion extending in one direction by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube and the inner diameter is kept constant.

The fourth inner diameter portion is formed on one side of the third inner diameter portion and has a larger inner diameter than the third inner diameter portion

The first electric field alleviation unit is positioned between the first inner diameter portion and the second inner diameter portion and includes a second enlarged diameter portion whose inner diameter gradually increases toward the other side.

The inner diameter of the first electric field alleviation part is kept constant or the inner diameter gradually increases toward the other side.

A length in which the second inner diameter portion extends to the other side is greater than or equal to that of the first inner diameter portion.

The first electric field alleviating part is configured to include a first contact part that is in contact with an outer peripheral surface of one end of the insulating tube and is formed on one side of the first inner diameter part.

The first electric field alleviation part is located between the first contact part and the first inner diameter part and includes a first enlarged diameter part whose inner diameter gradually increases toward the other side.

The second enlarged diameter portion has a radial width greater than or equal to that of the first enlarged diameter portion.

According to the embodiments of the present invention, the distance between the equipotential lines around the triple point (A1, B1) of the insulator is widened, so the electric field around the triple point (A1, B1) is relaxed to facilitate the triple point (A1, A1) of the insulator at low cost. B1) The insulation performance of the part can be improved.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 shows the normally closed pole (current passing) state of the circuit breaker according to the prior art, FIG. 2 shows the open pole (during current interrupting operation) state of the circuit breaker according to the prior art, and FIG. 3 is an enlarged view of FIG. 2 It is one cross section.
4 is an enlarged cross-sectional view of a main configuration 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.

The present invention is not limited to the embodiments disclosed below, but can be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete and to completely convey the scope of the invention to those of ordinary skill in the art. It is provided to inform you. Therefore, the present invention is not limited to the embodiments disclosed below, and all changes and equivalents included in the technical spirit and scope of the present invention as well as substituting or adding the configuration of any one embodiment and the configuration of other embodiments to each other It should be understood to include water or substitutes.

The accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes. In the drawings, in consideration of the convenience of understanding, etc., the size or thickness may be exaggeratedly expressed as large or small, but the protection scope of the present invention should not be construed as being limited thereto.

The terms used herein are used only to describe specific embodiments or examples, and are not intended to limit the present invention. And singular expressions include plural expressions unless the context clearly dictates otherwise. In the specification, terms such as includes, consists of, etc. are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist. That is, in the specification, terms such as include and consist of. It should be understood that this does not preclude the possibility of addition or existence of one or more other features or numbers, steps, operations, components, parts, or combinations thereof.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

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

When an element is referred to as being "on" or "below" another element, it should be understood that other elements may be present in the middle as well as disposed directly on the other element. .

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

In describing the embodiment, one may mean a left direction in the drawing, and the other may mean a right direction in the drawing. In addition, one side may mean a left side in the drawing, and the other side may mean a right side in the drawing, and one end may mean a left cross-section and the other end may mean a right cross-section.

Fig. 1 shows the normally closed pole (current passing) state of the circuit breaker according to the prior art, Figure 2 shows the open pole (during current interrupting operation) state of the circuit breaker according to the prior art, and Fig. 3 is an enlarged view of Fig. 2 It is one cross section.

1 to 3 , the circuit breaker 1 includes an opposing contact portion 10 , a movable contact portion 20 , a first support portion 30 , a second support portion 40 , an insulating tube 50 , and a tank (60), the lead conductor (70) and is configured to include a driving unit (80).

[Opposite contact part]

The opposing contact part 10 may be disposed to face the movable contact part 20 and may be fixed to the first support part 30 . The opposing contact part 10 may be electrically connected to the lead-in conductor 70a on one side through the first support part 30 .

The opposing contact portion 10 may include an opposing energized contactor 11 and an opposing arc contactor 12 .

The opposing energized contact 11 may be a cylindrical conductor having openings formed at both ends, and an edge of the opening on the other side may protrude inward in the radial direction. In addition, the opposing energized contactor 11 may be located inside the insulating tube 50 , and may be erected on the other end surface of the first support part 30 and extended to the other side.

The opposing arc contactor 12 may correspond to a solid cylindrical conductor having a rounded other end. The opposing arc contactor 12 may have one end coupled to the first support part 30 and disposed on the central axis such that the other end faces the other.

[Moving contact part]

The movable contact part 20 may be disposed to face the opposing contact part 10 and may be slidably inserted into the second support part 40 . The movable contact part 20 may be electrically connected to the inlet conductor 70b on the other side through the second support part 40 .

The movable contact portion 20 may be configured to include a movable energized contactor 21 , a movable arc contactor 22 and an operation rod 23 .

The movable energized contactor 21 may correspond to a cylindrical conductor having an opening in its cross section, and may be disposed to face the opposite energized contactor 11 . The outer diameter of the movable energized contactor 21 may coincide with the inner diameter of the opening edge portion protruding radially inwardly of the opposing energized contactor 11 .

By inserting the movable energized contactor 21 into the opening of the opposing energized contactor 11, the inner surface of the opposing energized contactor 11 and the outer surface of the movable energized contactor 21 come into contact with each other and become electrically conductive. In addition, since the movable energized contact 21 is withdrawn from the opening of the opposing energized contactor 11 , the opposing energized contact 11 can be electrically separated from the movable energized contact 21 .

The movable arc contactor 22 may be addressed to one end of the operating rod 23 and may be connected to the opposing arc contactor 12 .

The operating rod 23 may be disposed on the central axis and may correspond to a hollow barrel having an opening formed on one side. The other end of the operating rod 23 may be connected to the insulating rod 82 and may be connected to the mechanism 81 through the insulating rod 82 .

As the operation rod 23 is pushed and pulled by the mechanism 81 , the entire movable contact portion 20 may move toward the opposing contact portion 10 or move in a direction away from the opposing contact portion 10 .

[First support part]

The first support part 30 may have a hollow cylindrical shape with openings formed at both ends, and at least a part of the first support part 30 may be formed of a conductor.

The first support part 30 may be connected to the opposing contact part 10 and the lead-in conductor 70a on one side, and may support the opposing contact part 10 .

In addition, the first support portion 30 may be coupled to the insulating tube (50).

On the other hand, the first support part 30 is connected to the opposing contact part 10 and the lead-in conductor 70a and is coupled to the first support body part 30a and the insulating tube 50 for supporting the opposing contact part 10 . It may be configured to be separated by the first interpole flange portion 30b. The first support body portion 30a and the first interpole flange portion 30b may be coupled.

The first support part 30 includes a first coupling part 31 coupled to one end face of the insulating pipe 50 , and a first electric field mitigating part extending from the first coupling part 31 to the outside of the insulating pipe 50 to the other side. (32) may be included.

The first electric field alleviation unit 32 may be in contact with the outer peripheral surface of one end of the insulating tube 50 . Among the points where the first electric field alleviating part 32 and the outer circumferential surface of the insulating tube 50 are in contact, at the point of the other end, a conductor (first support part), an insulating material (insulator), an insulating gas (eg, sulfur hexafluoride gas) A triple point (A1, FIG. 3 ) may be formed where three types of materials having different physical properties of

On the other hand, when the first electric field alleviating part 32 does not contact the outer peripheral surface of one end of the insulating tube 50 , the triple point A1 is different from FIG. 3 , the first coupling part 31 and the insulating tube 50 . ) may be formed at the radially outer or inner end of one end of the insulating tube 50 to which it is coupled.

The first electric field alleviator 32 may relieve an electric field by widening the distance between equipotential lines around the triple point A1. However, in the prior art in FIGS. 1 to 3 , the electric field around the triple point A1 cannot be sufficiently relieved, so that dielectric breakdown occurs and the insulation tube 50 and the like may be damaged.

[Second support part]

The second support part 40 may have a hollow cylindrical shape with openings formed at both ends, and at least a part thereof may be formed of a conductor.

The second support part 40 may be connected to the movable contact part 20 and the lead-in conductor 70b of the other side, and may support the movable contact part 20 .

In addition, the second support portion 40 may be coupled to the insulating tube (50).

On the other hand, the second support part 40 is connected to the movable contact part 20 and the lead-in conductor 70b and is coupled to the second support body part 40a and the insulating tube 50 for supporting the movable contact part 20 It may be configured to be separated by the second interpole flange portion 40b. The second support body portion 40a and the second interpole flange portion 40b may be coupled.

The second support part 40 includes a second coupling part 41 coupled to the other end surface of the insulating pipe 50 and a second electric field alleviation part extending from the second coupling part 41 to an outer side of the insulating pipe 50 . (42) may be included.

The second electric field alleviation unit 42 may be in contact with the outer peripheral surface of the other end of the insulating tube 50 . Among the points where the second electric field alleviating part 42 and the outer circumferential surface of the insulating tube 50 are in contact, at one end point, a conductor (second support part), an insulating material (insulator), an insulating gas (eg, sulfur hexafluoride gas) A triple point (B1, FIG. 3 ) may be formed where three types of materials having different physical properties of

On the other hand, when the second electric field alleviating part 42 does not contact the outer peripheral surface of the other end of the insulating tube 50 , the triple point B1 is different from FIG. 3 , the second coupling part 41 and the insulating tube 50 ) may be formed at the radially outer or inner end of the other end of the insulating tube 50 to which it is coupled.

The second electric field alleviator 42 may relieve the electric field by widening the distance between equipotential lines around the triple point B1. However, in the prior art in FIGS. 1 to 3 , the electric field around the triple point B1 cannot be sufficiently relieved, so that dielectric breakdown may occur and the insulation tube 50 may be damaged.

[insulation barrel]

The insulating cylinder 50 may have a hollow cylindrical shape and may be made of, for example, an insulating material such as fiber reinforced plastic (FRP) or epoxy-based resin.

The insulating tube 50 may be disposed between the first support part 30 and the second support part 40 , and both end surfaces may be coupled to the first support part 30 and the second support part 40 . In addition, the opposite contact portion 10 may be disposed on one inner side of the insulating tube 50 , and the movable contact portion 20 may be disposed on the other inner side of the insulation tube 50 .

The insulating tube 50 may insulate between the space between the first support part 30 and the second support part 40 and the inner wall surface of the tank 60 , and the first support part 30 and the second support part 40 and Together, an arc extinguishing chamber can be formed.

[Tank]

The tank 60 may accommodate the opposing contact portion 10 , the movable contact portion 210 , the first/second support portions 30 and 40 , and the insulating tube 50 .

The tank 60 may be filled with an insulating gas. The insulating gas may be a gas having excellent fire extinguishing performance and insulating performance. For example, the insulating gas may be sulfur hexafluoride gas (SF6).

[Incoming conductor]

The lead conductor 70 may be connected to an external circuit.

The lead-in conductor 70a on one side may be connected to the first support part 30 , and the lead-in conductor 70b on the other side may be connected to the second support part 40 .

[drive part]

The driving unit 80 may include a mechanical unit 81 and an insulating rod 82 .

The mechanism 81 may move the insulating rod 82 connected to the mechanism 81 by a spring or hydraulic pressure to one side or the other.

The insulating rod 82 may be connected to the movable contact portion 20 and may move the movable contact portion 20 to one side or the other.

On the other hand, the circuit breaker according to an embodiment of the present invention includes the first support part 30 and the second support part 40 in the circuit breaker 1 of FIGS. 1 to 3 , the first support part 300 and the second support part 40 of FIG. It may correspond to the one replaced with the second support unit 400 . Hereinafter, look at 4.

4 is an enlarged cross-sectional view of a main configuration according to an embodiment of the present invention.

Referring to FIG. 4 , in the circuit breaker according to an embodiment, unlike FIG. 3 , the first electric field alleviation unit 320 of the first support unit 300 has a first inner diameter portion 322 and a second inner diameter portion 324 . , it may be configured to include a first enlarged diameter portion 326 and a second enlarged diameter portion 328 . In addition, unlike FIG. 3 , the second electric field alleviating part 420 of the second support part 400 has a third inner diameter part 422 , a fourth inner diameter part 424 , a third enlarged diameter part 426 , and a fourth expansion part 420 . It may be configured to include a neck 428 .

Hereinafter, only differences from the first/second support parts 30 and 40 of the prior art with respect to the first support part 300 and the second support part 400 will be described in detail.

[First support part]

The first electric field alleviation unit 320 has a first inner diameter portion 322 and a second inner diameter portion 324 extending to the other side by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube 50 and the inner diameter is kept constant. may be included.

The second inner diameter portion 324 may be formed on the other side of the first inner diameter portion 322 and have an inner diameter greater than that of the first inner diameter portion 322 .

In this way, the inner diameter of the first electric field alleviating part 320 is greater than the outer diameter of the insulating tube 50 and the first inner diameter extending to the other side by a predetermined length while the inner diameter of the first electric field alleviating part 320 is kept constant. 322 and the second inner diameter portion 324, and the second inner diameter portion 324 is formed on the other side of the first inner diameter portion 322 and has an inner diameter greater than the first inner diameter portion 322, so that the triple point (A1) Since the distance between the equipotential lines is widened, the electric field around the triple point (A1) can be relaxed, and the insulation performance of the triple point (A1) can be easily improved at low cost.

In addition, the first electric field alleviation unit 320 may include a second enlarged diameter portion 328 positioned between the first inner diameter portion 322 and the second inner diameter portion 324 and having an inner diameter gradually increasing toward the other side. . Accordingly, for example, the cross section of the inner circumferential surface of the second enlarged diameter portion 328 may correspond to a straight line inclined obliquely outward in the radial direction toward the other side.

As described above, the first electric field alleviation unit 320 is positioned between the first inner diameter portion 322 and the second inner diameter portion 324 and includes a second enlarged diameter portion 328 whose inner diameter gradually increases toward the other side. Since the interval of the equipotential lines around the triple point A1 is widened, the electric field around the triple point A1 can be relaxed to improve the insulation performance of the triple point A1 part easily at low cost.

Also, the inner diameter of the first electric field alleviation unit 320 may be kept constant or the inner diameter may gradually increase toward the other side.

In this way, the inner diameter is kept constant or the inner diameter is gradually increased as the first electric field alleviation unit 320 goes to the other side, so that the interval of the equipotential lines around the triple point A1 is widened, so that the electric field around the triple point A1 is It is possible to easily improve the insulation performance of the triple point (A1) part at low cost.

Meanwhile, the length d2 of the second inner diameter portion 324 extending in the other direction may be greater than or equal to the length d1 of the first inner diameter portion 322 extending in the other direction.

As such, the length d2 of the second inner diameter portion 324 extending in the other direction is greater than or equal to the length d1 of the first inner diameter portion 322 extending in the other direction, so that the equipotential line around the triple point A1 is Since the gap is widened, the electric field around the triple point (A1) can be relaxed, so that the insulation performance of the triple point (A1) can be easily improved at low cost.

The first electric field alleviation part 320 may be configured to include a first contact part 321 that is in contact with the outer peripheral surface of one end of the insulating tube 50 and is formed on one side of the first inner diameter part 322 .

In this way, the first electric field alleviation part 320 is configured to include a first contact part 321 that is in contact with the outer peripheral surface of one end of the insulating tube 50 and is formed on one side of the first inner diameter part 322 , so that the triple point (A1) Since the distance between the equipotential lines is widened, the electric field around the triple point (A1) can be relaxed, and the insulation performance of the triple point (A1) can be easily improved at low cost.

Also, the first electric field alleviation unit 320 may include a first enlarged diameter portion 326 positioned between the first contact portion 321 and the first inner diameter portion 322 and having an inner diameter gradually increasing toward the other side. Accordingly, for example, the cross section of the inner circumferential surface of the first enlarged diameter portion 326 may correspond to a straight line inclined obliquely outward in the radial direction toward the other side.

In this way, the first electric field alleviation part 320 is positioned between the first contact part 321 and the first inner diameter part 322 and includes a first enlarged diameter part 326 whose inner diameter gradually increases toward the other side. (A1) Since the distance between the equipotential lines is widened, the electric field around the triple point (A1) can be relaxed, and the insulation performance of the triple point (A1) can be easily improved at low cost.

In this case, the radial width w2 of the second enlarged diameter portion 328 may be greater than or equal to the radial width w1 of the first enlarged diameter portion 326 .

As such, the radial width w2 of the second enlarged diameter portion 328 is greater than or equal to the radial width w1 of the first enlarged diameter portion 326, so that the interval of the equipotential lines around the triple point A1 is widened. Therefore, it is possible to improve the insulation performance of the triple point (A1) easily at low cost by relaxing the electric field around the triple point (A1).

[Second support part]

The second electric field alleviation unit 420 has a third inner diameter portion 422 and a fourth inner diameter portion 424 extending to the other side by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube 50 and the inner diameter is kept constant. may be included.

The fourth inner diameter portion 424 may be formed on the other side of the third inner diameter portion 422 and have an inner diameter greater than that of the third inner diameter portion 422 .

In this way, the inner diameter of the second electric field alleviating part 420 is greater than the outer diameter of the insulating tube 50 and the third inner diameter part extending to the other side by a predetermined length while the inner diameter of the second electric field alleviating part 420 is kept constant. 422 and a fourth inner diameter portion 424, and the fourth inner diameter portion 424 is formed on the other side of the third inner diameter portion 422 and has an inner diameter greater than the third inner diameter portion 422, so that the triple point Since the distance between the equipotential lines around (B1) is widened, the electric field around the triple point (B1) can be relaxed, and the insulation performance of the triple point (B1) can be easily improved at low cost.

In addition, the second electric field alleviation unit 420 may include a fourth enlarged diameter portion 428 positioned between the third inner diameter portion 422 and the fourth inner diameter portion 424 and having an inner diameter gradually increasing toward one side. . Accordingly, for example, the cross section of the inner circumferential surface of the fourth enlarged diameter portion 428 may correspond to a straight line inclined obliquely outward in the radial direction toward one side.

As described above, the second electric field alleviation unit 420 is positioned between the third inner diameter portion 422 and the fourth inner diameter portion 424 and includes a fourth enlarged diameter portion 428 whose inner diameter gradually increases toward one side. Since the interval of the equipotential lines around the triple point B1 is widened, the electric field around the triple point B1 can be relaxed to improve the insulation performance of the triple point B1 part easily at low cost.

In addition, the inner diameter of the second electric field alleviation unit 420 may be kept constant as it goes toward one side or the inner diameter may gradually increase.

As described above, as the inner diameter of the second electric field alleviator 420 is kept constant or the inner diameter gradually increases toward one side, the interval of equipotential lines around the triple point B1 is widened. It is possible to easily improve the insulation performance of the triple point (B1) part.

Meanwhile, the length d4 at which the fourth inner diameter portion 424 extends in one direction may be greater than or equal to the length d3 at which the third inner diameter portion 422 extends in one direction.

As such, the length d4 at which the fourth inner diameter portion 424 extends in one direction is greater than or equal to the length d3 at which the third inner diameter portion 422 extends in one direction. Since the gap is widened, the electric field around the triple point (B1) can be relaxed, and the insulation performance of the triple point (B1) portion can be easily improved at low cost.

The second electric field alleviation part 420 may be configured to include a second contact part 421 that is in contact with the outer peripheral surface of the other end of the insulating tube 50 and is formed on the other side of the third inner diameter part 422 .

In this way, the second electric field alleviating part 420 is configured to include a second contact part 421 that is in contact with the outer peripheral surface of the other end of the insulating tube 50 and is formed on the other side of the third inner diameter part 422, so that the triple point Since the distance between the equipotential lines around (B1) is widened, the electric field around the triple point (B1) can be relaxed, and the insulation performance of the triple point (B1) can be easily improved at low cost.

Also, the second electric field alleviation unit 420 may include a third enlarged diameter portion 426 positioned between the second contact portion 421 and the third inner diameter portion 422 and having an inner diameter gradually increasing toward one side. Accordingly, for example, the cross section of the inner peripheral surface of the third enlarged diameter portion 426 may correspond to a straight line inclined obliquely outward in the radial direction toward one side.

In this way, the second electric field alleviation part 420 is positioned between the second contact part 421 and the third inner diameter part 422 and includes a third enlarged diameter part 426 whose inner diameter gradually increases toward one side. Since the distance between the equipotential lines around (B1) is widened, the electric field around the triple point (B1) can be relaxed, and the insulation performance of the triple point (B1) can be easily improved at low cost.

In this case, the radial width w4 of the fourth enlarged diameter portion 428 may be greater than or equal to the radial width w3 of the third enlarged diameter portion 426 .

As such, the radial width w4 of the fourth expanded diameter portion 428 is greater than or equal to the radial width w3 of the third expanded diameter portion 426, so that the interval of the equipotential lines around the triple point B1 is widened. Therefore, it is possible to improve the insulation performance of the triple point (B1) portion easily at low cost by relaxing the electric field around the triple point (B1).

The specific effects are as follows.

[Table 1]

Referring to the experimental results of Table 1, through the configuration of the first and second electric field relaxation units 320 and 420 shown in FIG. 4, the triple point A1 of one side of the insulating tube 50 and the insulating tube 50 It can be seen that the electric field strength is significantly reduced at the triple point (B1) of the other side.

However, the experimental results of Table 1 can be derived when the first/second support parts 30, 40, 300, and 400 correspond to the shapes shown in FIGS. 3 and 4, respectively, and Configurations other than the second support parts 30 , 40 , 300 , and 400 may be configured in a form slightly different from the configuration shown in FIGS. 1 to 4 .

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made.

In addition, although the effects of the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

1: circuit breaker
10: opposing contact part
11: Opposite energized contactor 12: Opposite arc contactor
20: movable contact part 21: movable energized contactor
22: movable arc contactor 23: operation rod
30: first support part
31: first coupling unit 32: first electric field relaxation unit
40: second support
41: second coupling unit 42: second electric field relaxation unit
50: insulator 60: tank
70: lead conductor 80: drive unit
300: first support part 310: first coupling part
320: first electric field relaxation unit 321: first contact unit
322: first inner diameter portion 324: second inner diameter portion
326: first expansion part 328: second expansion part
400: second support part 410: second coupling part
420: second electric field relaxation unit 421: second contact unit
422: third inner diameter portion 424: fourth inner diameter portion
426: third expansion part 428: fourth expansion part

Claims (7)

an opposing contact portion and a movable contact portion disposed to face each other and electrically connected or separated;
a first support part supporting the opposing contact part and at least a part of which is made of a conductor;
a second support part supporting the movable contact part and at least a part of which is made of a conductor; and
and an insulating tube disposed between the first support part and the second support part, the opposing contact part is disposed on one inner side, and the movable contact part is disposed on the inner side on the other side,
The first support part is configured to include a first coupling part coupled to one end face of the insulator, and a first electric field alleviation part extending from the first coupling part to the outside of the insulator to the other side,
The second support portion is configured to include a second coupling portion coupled to the other end surface of the insulator and a second electric field mitigating portion extending from the second coupling portion to an outer side of the insulator,
The first electric field alleviation unit is configured to include a first inner diameter portion and a second inner diameter portion extending to the other side by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube and the inner diameter is kept constant,
The second inner diameter portion is formed on the other side of the first inner diameter portion and has a larger inner diameter than the first inner diameter portion
The second electric field alleviation unit is configured to include a third inner diameter portion and a fourth inner diameter portion extending in one direction by a predetermined length while the inner diameter is greater than the outer diameter of the insulating tube and the inner diameter is kept constant,
The fourth inner diameter portion is formed on one side of the third inner diameter portion and has a larger inner diameter than the third inner diameter portion, the circuit breaker.
The method according to claim 1,
The first electric field alleviation unit is located between the first inner diameter portion and the second inner diameter portion and is configured to include a second enlarged portion whose inner diameter gradually increases toward the other side.
The method according to claim 1,
The first electric field alleviation unit, the inner diameter is kept constant or the inner diameter gradually increases toward the other side, a circuit breaker.
The method according to claim 1,
The length at which the second inner diameter portion extends to the other side is greater than or equal to the length of the first inner diameter portion.
The method according to claim 1,
The first electric field alleviating portion is configured to include a first contact portion that is in contact with an outer peripheral surface of one end of the insulating tube and is formed on one side of the first inner diameter portion.
6. The method of claim 5,
The first electric field alleviation part is located between the first contact part and the first inner diameter part and is configured to include a first enlarged diameter part having an inner diameter gradually increasing toward the other side.
7. The method of claim 6,
The first electric field alleviation part is located between the first inner diameter part and the second inner diameter part and includes a second enlarged diameter part whose inner diameter gradually increases toward the other side,
The second enlarged diameter portion has a radial width greater than or equal to that of the first enlarged diameter portion, a circuit breaker.

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