Triple-point electric field relaxation structure of conductor insulation coating end of gas-insulated switchgear and gas-insulated switchgear having same

Abstract

The present invention relates to a triple-point electric field relaxation structure of a conductor insulation coating end of a gas-insulated switchgear, the triple-point electric field relaxation structure comprising: a hollow conductor having an opening part formed at one or more ends into which an electrical connection rod is inserted; an electric field relaxation groove part which is located adjacent to the opening part in the conductor and has a round shape; and an insulation coating member that is disposed so as to surround the outer wall portion and the inner wall portion of the opening part of the conductor, and that extends to the electric field relaxation groove part and surrounds a portion of the electric field relaxation groove part. The present invention has the advantage of removing a risk factor for insulation performance by applying a conductor-shaped structure for relaxing a triple-point electric field of an insulation coating end in order to partially apply an insulation coating to the conductor.

Description

Triple point electric field mitigation structure at the end of the conductor insulation coating of a gas-insulated switchgear, and a gas-insulated switchgear having the same

[0001] The present invention relates to a triple-point electric field mitigation structure at the end of a conductor insulation coating of a gas-insulated switchgear, and more specifically, to a triple-point electric field mitigation structure at the end of a conductor insulation coating of a gas-insulated switchgear that is applied to the middle or end of a conductor of a gas-insulated switchgear to mitigate electric fields.

[0002] In general, a gas-insulated switchgear is composed of tanks filled with insulating gas and connected to wires, and a disconnector is installed to open and close the line by connecting or disconnecting the conductor of one side of the wire and the conductor of the other side of the wire.

[0003] The conductors within these gas-insulated switchgear are generally nonconductive, but in some cases, an insulating coating is applied to the conductor surface to enhance electrical insulation performance. The insulation coating is applied to the entire surface of the conductor, excluding the contact surface between conductors, and in some cases, it may be applied partially.

[0004] The end of the insulating coating is a triple point structure where the insulating gas, coating material (insulator), and conductor (metal) come into contact, and thus a high electric field intensity is formed, which acts as a factor in reducing the electrical insulation performance of the gas-insulated switch.

[0005] When the conductor is relatively small, an insulation coating can be applied to its entire surface. However, when the conductor is large, coating the entire surface has disadvantages in terms of cost and quality control. Furthermore, since areas on the conductor surface where the electric field is high and insulation performance enhancement is required are localized, applying a partial insulation coating can overcome the disadvantages of full-surface coating.

[0006] However, in the case of full-surface coating, since the coating end can be positioned in an area with a low electric field, it is easy to alleviate the triple point electric field. However, when partial coating is applied, it is difficult to position the insulation coating end in an area with a low electric field, so the electric field due to the triple point at the coating end appears high. Therefore, when the insulation coating is partially applied to the conductor, it is necessary to alleviate the triple point electric field at the insulation coating end.

[0007] [Prior Art Literature]

[0008] [Patent Document]

[0009] (Patent Document 1) KR 10-2011-0075821 A1 "Disconnector and grounding switch for gas-insulated switchgear"

[0010] Embodiments of the present invention provide a triple-point electric field mitigation structure at the end of an insulation coating of a gas-insulated switchgear conductor, which eliminates a risk factor for insulation performance at the end of the insulation coating of the conductor by applying a conductor shape structure that mitigates the triple-point electric field at the end of the insulation coating in the partial insulation coating application of a conductor used in a gas-insulated switchgear, and a gas-insulated switchgear having the same.

[0011] According to one aspect of the present invention, a triple-point electric field relief structure at the end of an insulation coating of a gas-insulated switchgear conductor can be provided, including: a hollow conductor having an opening formed at one or more ends into which an electrical connection rod is inserted; an electric field relief groove formed in a round shape and positioned adjacent to the opening in the conductor; and an insulating coating member arranged to surround an outer wall and an inner wall of the opening of the conductor, and extending to the electric field relief groove to surround a portion of the electric field relief groove.

[0012] According to another aspect of the present invention, a conductor; a plurality of field-relieving grooves having a round shape and positioned on both sides of a portion of the conductor; and an insulating coating member arranged to surround an outer wall portion of the portion of the conductor, extending to the field-relieving grooves and surrounding a portion of the field-relieving grooves.

[0013] The above-described electric field relief groove may include a first round-shaped portion connected to an outer surface of the opening; a round connecting surface extending from the first round-shaped portion to a bottom surface of the electric field relief groove; and a second round-shaped portion connecting the round connecting surface and the bottom surface of the electric field relief groove.

[0014] The above insulating coating member may be provided to surround the first round-shaped portion, the round connecting surface, and the second round-shaped portion.

[0015] The first round shape portion, the round connecting surface, and the second round shape portion are provided symmetrically with respect to the center line of the electric field alleviation groove portion, and the insulating coating member can be positioned to extend to the center line provided on the bottom surface of the electric field alleviation groove portion.

[0016] The above first round shape portion may be provided with a larger round radius than the above second round shape portion.

[0017] The round connecting surface of the above-mentioned electric field relief groove is provided as a curved slope that extends the above-mentioned electric field relief groove from the bottom surface, and the bottom surface of the above-mentioned electric field relief groove may be provided to be at least half the distance of the upper sides of the above-mentioned electric field relief groove.

[0018] The configuration of the present invention further includes a bottom groove portion provided deeper than the field relief groove portion in the center of the bottom surface of the field relief groove portion, and the insulating coating member can be placed by being inserted into the bottom groove portion.

[0019] The opening of the conductor includes an opening curved portion that is curvedly connected to the outer wall portion at the shortest part; and a shortest round connecting portion that is connected to the opening curved portion to form the shortest part and is connected to the inner wall portion, and the insulating coating member can be arranged to extend to the inner wall portion of the opening at a depth shorter than the distance from the shortest part of the opening to the electric field relief groove portion.

[0020] The above insulating coating member may be prepared as a paint mixed with one or more of silicone, fluororesin, and epoxy.

[0021] According to another aspect of the present invention, a gas-insulated switchgear can be provided, which includes a triple-point electric field relief structure at the end of the gas-insulated switchgear conductor insulation coating described above.

[0022] Embodiments of the present invention can provide a triple-point electric field relief structure at the end of a conductor insulation coating of a gas-insulated switchgear, which eliminates a risk factor for insulation performance at the end of the insulation coating of a conductor by applying the end of an insulation coating member into an electric field relief groove, which is a conductor-shaped structure that relieves the triple-point electric field at the end of the insulation coating, in the partial insulation coating application of a conductor used in a gas-insulated switchgear, and a gas-insulated switchgear having the same.

[0023] In addition, embodiments of the present invention can provide a triple-point electric field mitigation structure at the end of a conductor insulation coating of a gas-insulated switch, which improves the quality reliability of the electrical insulation performance of the gas-insulated switch, and allows partial insulation coating on the conductor, thereby reducing costs compared to full-surface insulation coating of the conductor, and a gas-insulated switch having the same.

[0024] FIG. 1 is a front view of a conductor having a triple-point electric field mitigation structure at the end of a gas-insulated switch conductor insulation coating according to one embodiment of the present invention.

[0025] Fig. 2a is a cross-sectional view showing in detail the electric field relaxation groove and the insulating coating member of Fig. 1.

[0026] Fig. 2b is another cross-sectional view showing in detail the electric field relaxation groove and the insulating coating member of Fig. 1.

[0027] Figure 3 is an electric field analysis diagram of the electric field relaxation groove and insulating coating member of Figure 2a.

[0028] FIG. 4 is a three-dimensional drawing of a linear conductor having a triple-point electric field mitigation structure at the end of a gas-insulated switch conductor insulation coating according to another embodiment of the present invention.

[0029] Fig. 5 is a detailed drawing of a section of Fig. 4 showing the electric field relaxation groove and the insulating coating member.

[0030] FIG. 6 is a conceptual diagram of a disconnector of a gas-insulated switch in which a triple-point electric field mitigation structure is applied to the end of a conductor insulation coating of a gas-insulated switch according to one embodiment of the present invention.

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosure is thorough and complete, and to sufficiently convey the spirit of the present invention to those skilled in the art. Like reference numbers designate like elements throughout the specification.

[0032] FIG. 1 is a front view of a conductor having a triple-point electric field relief structure at the end of an insulation coating of a gas-insulated switch conductor according to one embodiment of the present invention, and FIG. 2a is a cross-sectional view showing in detail the electric field relief groove and the insulation coating member of FIG. 1.

[0033] Referring to FIGS. 1 and 2, a triple-point electric field relief structure of an insulation coating end of a gas-insulated switchgear conductor according to an embodiment of the present invention comprises a hollow conductor (101) having an opening (110) provided at one or more ends into which an electrical connection rod is inserted, a field relief groove (120) having a round shape and positioned adjacent to the opening (110) in the conductor (101), and an insulation coating member (130) arranged to surround an outer wall (116) and an inner wall (115) of the opening (110) of the conductor (101), extending to the field relief groove (120) and surrounding a portion of the field relief groove (120).

[0034] In this embodiment, an insulating coating member (130) is applied as a partial coating to the connection portion of large conductors (101) that are electrically interconnected in a gas-insulated switch.

[0035] In this embodiment, when applying a partial insulating coating to a conductor (101), a groove shape is applied to the conductor (101) so that the coating end (131) can be located in an area with a low electric field, and the coating end (131) for insulation is located within the groove.

[0036] According to this embodiment, the coating end (131), which is the end of the coating surface of the insulating coating member (130), which is a partial coating on the surface of the conductor (101), is positioned deeper than the surface of the conductor (101), thereby lowering the electric field at the triple point where the end of the partial coating, the insulating gas, and the metal material, which is the conductor (101), come into contact.

[0037] Accordingly, in the partial insulation coating of the conductor (101) of the gas-insulated switch, partial insulation coating is possible on the conductor (101), which reduces costs compared to full insulation coating on the conductor (101), and provides improved reliability in the quality of electrical insulation performance.

[0038] The opening (110) of the conductor (101) includes an opening curved portion (111) that is curvedly connected to the outer wall portion (116) at the shortest part, and a shortest round connecting portion (112) that is connected to the opening curved portion (111) to form the shortest part and is connected to the inner wall portion (115).

[0039] The insulating coating member (130) is provided to surround the opening (110) of the conductor (101), and the end of the insulating coating member (130) can be positioned deeper than the surface of the conductor (101) by means of an electric field relief groove (120) provided in the conductor (101). At this time, the electric field relief groove (120) is formed so that the end of the insulating coating member (130) is formed in a curved shape and positioned without an angular shape.

[0040] The electric field relief groove (120) for this purpose can be provided such that the triple point of the electric field for the insulating coating member (130) is arranged on the inside, and includes a first round-shaped portion (121) connected to the outer surface of the opening (110), a round connecting surface (122) extending from the first round-shaped portion (121) to the bottom surface (124) of the electric field relief groove (120), and a second round-shaped portion (123) connecting the round connecting surface (122) and the bottom surface (124) of the electric field relief groove (120).

[0041] These first round shape portion (121) and second round shape portion (123) can be adjusted according to the width and depth of the groove provided by the electric field relief groove portion (120). In this case, if there is no problem with the coating attachment to the inner surface or bottom surface of the electric field relief groove portion (120) of the insulating coating member (130), the second round shape portion (123) may be omitted without performing round processing.

[0042] The radius of curvature of the first round shape portion (121) and the second round shape portion (123) of the electric field relaxation groove portion (120) can be determined to have a ratio or numerical range with respect to the radius of the conductor (101).

[0043] The first round shape portion (121) can be provided with a larger round radius than the second round shape portion (123).

[0044] For example, when the diameter of the conductor (101) is 50 mm to 100 mm, the radius of the first round shape portion (121) can be set to be between 3 mm to 10 mm, and the radius of the second round shape portion (123) can be set to be between 1 mm to 5 mm.

[0045] In general, the electric field relief groove (120) may be provided in a flat or round groove shape with a bottom surface (124), but is not necessarily limited thereto, and may also be a trapezoid or square shape with filleted edges.

[0046] The first round shape portion (121) and the second round shape portion (123) are connected by a round connecting surface (122). At this time, the round connecting surface (122) may be provided in a convexly round shape to connect the first round shape portion (121) and the second round shape portion (123) in a natural, smooth curved shape without any bending, as shown.

[0047] For example, the round connecting surface (122) of the electric field relief groove (120) is provided as a curved slope that extends the electric field relief groove (120) from the bottom surface (124), and the bottom surface (124) of the electric field relief groove (120) can be provided to be at least half of the distance between the upper sides of the electric field relief groove (120).

[0048] As described above, the first round shape portion (121), the round connecting surface (122), and the second round shape portion (123) enable the insulating coating member (130) to be firmly attached to the conductor (101) when applying a partial coating by the insulating coating member (130) to the end of the conductor (101), and by allowing the coating end (131) of the insulating coating member (130) to be positioned deeper than the surface of the conductor (101), electric field relaxation for the triple point can be provided.

[0049] Meanwhile, the insulating coating member (130) may be provided to surround a portion of the bottom surface (124) of the electric field alleviation groove (120) together with the first round-shaped portion (121), the round connecting surface (122), and the second round-shaped portion (123). The shape of the insulating coating member (130) corresponds to the shape of the electric field alleviation groove (120), thereby enhancing the electric field alleviation performance of the insulating coating member (130) in the electric field alleviation groove (120) while preventing the phenomenon of peeling off from the surface of the conductor (101).

[0050] The first round shape portion (121), the round connecting surface (122), and the second round shape portion (123) are arranged symmetrically with respect to the center line of the electric field alleviation groove portion (120). At this time, the insulating coating member (130) may be positioned to extend to the center line provided on the bottom surface (124) of the electric field alleviation groove portion (120).

[0051] The shape of the groove of the electric field relief groove (120) is rounded (R1, R2) to limit the increase in electric field due to the corners and provide a structure in which the insulating coating member (130) can be smoothly attached to the conductor (101). In addition, the dimensions of the rounded processing (R1, R2) are adjusted according to the width and depth of the groove shape, and if there is no problem with the coating attachment of the insulating coating member (130), the rounded processing may not be performed for R2.

[0052] Accordingly, the insulating coating member (130) extends to the middle of the bottom surface (124) of the electric field relief groove (120), and the end of the insulating coating member (130) substantially extends deep enough to the bottom surface (124), so that electric field relief for the end of the insulating coating member (130) can be naturally achieved.

[0053] Meanwhile, the insulating coating member (130) may be arranged to extend to the inner wall (115) of the opening (110) at a depth shorter than the distance from the shortest part of the opening (110) to the electric field relief groove (120).

[0054] That is, the insulating coating member (130) is shaped to surround the inner wall (115) and outer wall (116) of the opening (110) of the conductor (101), and the electric field mitigation groove (120) is positioned sufficiently apart from the shortest part of the opening (110), thereby forming an insulating coating in which the coating length on the outer wall (116) side is longer than the coating length on the inner wall (115) side. Accordingly, damage to the conductor (101) due to the electric field effect acting on the outer surface of the conductor (101) can be prevented.

[0055] The insulating coating member (130) may be prepared as a paint mixed with one or more of silicone, fluororesin, and epoxy. The material composition of the insulating coating member (130) may have a mixing ratio determined according to the maximum electric field acting inside the gas insulated switch and the intensity of the electric field at the triple point. Silicone or fluororesin may be used as a material providing high insulation and heat resistance, and epoxy may be used as a material providing adhesion to the conductor (101). For example, the fluororesin may be provided as ETFE, PFA, etc. Meanwhile, a filler may or may not be mixed in the silicone, fluororesin, and epoxy.

[0056] Fig. 2b is another cross-sectional view showing in detail the electric field relaxation groove (120) and the insulating coating member (130) of Fig. 1.

[0057] Referring to FIG. 2b, a field mitigation structure according to another embodiment of the present invention may further include a bottom groove (125) formed deeper than the field mitigation groove (120) at the center of the bottom surface of the field mitigation groove (120). Accordingly, the insulating coating member (130) may be disposed so as to be inserted into the bottom groove (125), and the triple point formed by the coating end (131) of the insulating coating member (130) may be disposed deeper than the bottom surface of the field mitigation groove (120), thereby improving the field mitigation performance.

[0058] For example, the bottom groove (125) can be provided by forming a step while being arranged more deeply in the groove shape as described above, while the electric field relief groove (120) is formed wider than the above.

[0059] Accordingly, the insulating coating member (130) can be placed deeper from the inside of the electric field relief groove (120) to the bottom groove (125) without forming an edge in the narrow space inside the electric field relief groove (120).

[0060] Figure 3 is an electric field analysis diagram of the electric field relaxation groove (120) and the insulating coating member (130) of Figure 2a.

[0061] Referring to FIGS. 1, 2a, and 3, in the present embodiments, the area of ​​the coating end (131) of the insulating coating member (130) in the electric field mitigation groove (120) appears in blue, and the contour lines appear consistently from blue to sky blue, green, and yellow in the outward direction from the electric field mitigation groove (120). Accordingly, it can be seen that the electric field influence on the electric field mitigation groove (120) is stably small, and the lowest electric field state is shown at the coating end (131).

[0062] In this way, in the present embodiment, the electric field effect on the triple point area of ​​the insulating coating member (130) in the electric field relaxation groove (120) is lowered, thereby showing a phenomenon in which the electric field concentration phenomenon is reduced, and an electric field reduction effect is shown in which insulation breakdown on the triple point of the coating end (131) of the insulating coating member (130) is sufficiently prevented.

[0063] FIG. 4 is a three-dimensional drawing of a linear conductor having a triple-point electric field relief structure at the end of an insulation coating of a gas-insulated switch conductor according to another embodiment of the present invention, and FIG. 5 is a detailed drawing of a part of the section in which the electric field relief groove and the insulation coating member of FIG. 4 are illustrated.

[0064] Referring to FIGS. 4 and 5, according to another embodiment of the present invention, a triple-point electric field relief structure of an end of a gas-insulated switchgear conductor insulation coating may be provided, including: a conductor (105); a plurality of field relief grooves (120) provided in a round shape and positioned on both sides of a portion of the conductor (105); and an insulating coating member (130) arranged to surround an outer wall portion (116) of a portion of the conductor (105), extending to the field relief grooves (120) and surrounding a portion of the field relief grooves (120).

[0065] Another embodiment of this invention is to apply the partial coating of the above-described electric field mitigation groove (120) and the insulating coating member (130) to a linear conductor (105) having a shape similar to that of the conductor (105) of the circuit breaker, whereby, for example, an insulating coating is required for a portion of the linear conductor (105) passing through a spacer.

[0066] Accordingly, the linear conductor (105) has a section where the above-described electric field mitigation groove (120) and insulating coating member (130) are applied, so that electric field mitigation performance for the triple point can be expected at both ends of the insulating coating member (130).

[0067] Meanwhile, in the above embodiments, the insulating coating member (130) may be applied after treating with a primer along with removing the oil film from the surface of the opening (110) of the conductor (105). In addition, the insulating coating member (130) may be applied by being applied from the end of the conductor (105) to the electric field relief groove (120), but is not limited thereto, and may be separately manufactured as a thin film and flexibly assembled to the conductor (105).

[0068] FIG. 6 is a conceptual diagram of a disconnector of a gas-insulated switch in which a triple-point electric field mitigation structure is applied to the end of a conductor insulation coating of a gas-insulated switch according to one embodiment of the present invention.

[0069] According to one embodiment of the present invention with reference to FIGS. 1 to 6, a gas-insulated switch can be provided, which includes a triple-point electric field relief structure at the end of the conductor insulation coating of the gas-insulated switch described above.

[0070] A gas-insulated switch is configured to include a spacer positioned between tanks filled with insulating gas, and an insulating shield ring built into an outer portion adjacent to the edge of the spacer, wherein bus bars are connected to both sides of the spacer, an insulating connection portion connecting the bus bars on both sides is provided in the center portion, and the bus bar is arranged in the central space of the internal passage of the tank. At this time, the conductor (105) described above can be used as the bus bar.

[0071] In these gas-insulated switches, a disconnector (10) that opens and closes the line in a link manner is installed.

[0072] The disconnector (10) is included as one side of a gas-insulated switch, and is configured such that horizontal and vertical one-side conductors (101) are electrically connected to the other-side conductor (102) arranged vertically lower and an insulating rod (11) driven by a connecting link (20), and a grounding link (21) that is connected and disconnected with a grounding rod for grounding is provided.

[0073] One side conductor (101) and the other side conductor (102) have a partial insulation coating applied in the same manner as the conductors (101, 102) of the above-described embodiment, and an electric field alleviation groove (120) and an insulation coating member (130) are formed at both ends or one end of the conductors (101, 102).

[0074] A gas-insulated switch equipped with such a circuit breaker (10) uses conductors (101, 102, 105) that apply the above-described electric field mitigation groove (120) and insulating coating member (130), and can reduce the electric field influence on the triple point of the electric field at the end of the partial insulating coating of the conductors (101, 102, 105).

[0075] Accordingly, the gas-insulated switch can improve the durability of the conductor (101, 102, 105), prevent malfunction or damage by improving the quality reliability of electrical insulation performance, and provide the advantage of cost reduction compared to full-scale insulation coating of the conductor by allowing partial insulation coating on the conductor.

[0076] While the present invention has been described above with reference to one embodiment, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as defined in the claims below. Therefore, any modified implementation that fundamentally includes the elements of the claims should be considered within the technical scope of the present invention.

[0077] [Explanation of symbols]

[0078] 10: Circuit breaker

[0079] 11: Insulating rod

[0080] 20: Connection Link

[0081] 21: Grounding switch link

[0082] 101, 102, 105: Conductor

[0083] 110: Opening

[0084] 111: Aperture bend

[0085] 112: Shortest round connection

[0086] 115: Inner wall

[0087] 116: Exterior wall

[0088] 120: Field relaxation home

[0089] 121: Round 1 Shape

[0090] 122: Round connection surface

[0091] 123: Second round shape section

[0092] 124: Floor surface

[0093] 125: Floor groove

[0094] 130: Insulating coating member

[0095] 131: Coating end

Claims

1. A hollow conductor having an opening provided at one or more ends into which an electrical connecting rod is inserted; A field-relieving groove having a round shape and positioned adjacent to the opening in the conductor; and A triple-point electric field relief structure at the end of a gas-insulated switch conductor insulation coating, comprising an insulating coating member arranged to surround an outer wall and an inner wall of an opening of the conductor, and extending to the electric field relief groove to surround a part of the electric field relief groove.

2. Conductor; A plurality of field-relief grooves having a round shape and located on both sides of a section of the conductor; and A triple point electric field relief structure at the end of a gas-insulated switch conductor insulation coating, comprising an insulating coating member arranged to surround an outer wall portion of a section of the conductor and extending to the electric field relief groove portion to surround a portion of the electric field relief groove portion.

3. In paragraph 1 or 2, The above field relaxation home part is, A first round shaped portion connected to the outer surface of the above opening; A round connecting surface extending from the first round shape portion to the bottom surface of the electric field relief groove portion; and A triple point electric field relief structure at the end of a gas insulated switch conductor insulation coating, comprising a second round-shaped portion connecting the round connecting surface and the bottom surface of the electric field relief groove.

4. In paragraph 3, A triple point electric field relief structure at the end of a gas insulated switch conductor insulation coating, wherein the insulating coating member is provided to surround the first round-shaped portion, the round connecting surface, and the second round-shaped portion.

5. In paragraph 4, The first round shape portion, the round connecting surface, and the second round shape portion are provided symmetrically with respect to the center line of the electric field relief groove portion, The above insulating coating member is a triple-point electric field relief structure at the end of the insulating coating conductor of a gas-insulated switch, which is positioned so as to extend to the center line provided on the bottom surface of the electric field relief groove.

6. In paragraph 3, A triple point electric field relief structure at the end of a gas insulated switch conductor insulation coating, wherein the first round shape portion is provided with a larger round radius than the second round shape portion.

7. In paragraph 3, The round connecting surface of the above-mentioned electric field relief groove is provided as a curved slope extending the above-mentioned electric field relief groove from the above-mentioned floor surface, A triple-point electric field relief structure at the end of a gas-insulated switch conductor insulation coating, wherein the bottom surface of the above-mentioned electric field relief groove is provided to be at least half the distance between the upper sides of the above-mentioned electric field relief groove.

8. In paragraph 1 or 2, The above electric field relief groove further includes a bottom groove formed deeper than the above electric field relief groove in the center of the bottom surface of the above electric field relief groove, The above insulating coating member is a triple point electric field relief structure at the end of a gas insulated switch conductor insulation coating, which is placed by being inserted into the floor groove.

9. In paragraph 1, The opening of the above conductor is, A curved opening connected to the shortest part of the outer wall; and It includes a shortest round connection portion that is connected to the above opening curved portion to form the shortest portion and is connected to the inner wall portion. The above insulating coating member, A triple point electric field relief structure at the end of a gas insulated switch conductor insulation coating, which is arranged to extend to the inner wall of the opening at a depth shorter than the distance from the shortest part of the opening to the electric field relief groove.

10. In any one of paragraphs 1 to 8, The above insulating coating member is a triple point electric field mitigation structure at the end of a gas insulated switch conductor insulation coating, which is prepared by mixing a paint with at least one of silicone, fluororesin, and epoxy.

11. A gas-insulated switch, comprising a triple-point electric field relief structure at the end of the gas-insulated switch conductor insulation coating according to paragraph 1 or 2.

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