JPH11122761A - Insulation space of gas insulated switch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively detect an electromagnetic wave due to partial discharge generated by irregular insulation within a gas insulated switch device, by providing a low dielectric material member having a lower dielectric constant than that of a mold resin to a part thereof arranged through the external circumference radially from thickness direction of an insulation spacer. SOLUTION: An insulation spacer 1 is formed of mold resin 4, low dielectric material member 2 and bus 5, etc., and the bus 5 is insulated and supported by a grounded metal case 3. A low dielectric material member 2 having a circular aperture having a dielectric constant lower than that of the mold resin 4 is provided at a part of the mold resin 4 through the external circumference radially from the thickness direction of the insulation spacer 1. The electromagnetic wave due to partial discharge generated by irregular insulation within the gas insulated switch device enters the low dielectric material member 2. Within the low dielectric material member 2, since dielectric constant is different at the interface with the mold resin 4, the electromagnetic wave is reflected at the interface and is then guided to the external circumference of the insulation spacer 1 depending on the shape of the low dielectric material member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating spacer for insulatingly supporting a bus in a grounded metal container of a gas insulated switchgear (hereinafter referred to as GIS).

[0002]

2. Description of the Related Art FIG. 4 shows an example of an insulating spacer for a single-phase GIS. As shown in FIG. 4, a single-phase GIS insulating spacer 1
Reference numeral 0 denotes a molded resin 40, a bus 50 embedded in the mold resin, and the like, and the bus 50 is insulated and supported in the grounded metal container 30. The outer peripheral surface of the molding resin 40 of the insulating spacer 10 is directly exposed to the atmosphere.

FIG. 5 shows an insulating spacer 10 having the above-described structure.
An example of a method for detecting a partial discharge generated inside a GIS by using a GIS having the following will be described. When detecting a partial discharge generated inside the GIS, the loop-shaped antenna 15 is attached so that the loop opening surface is parallel to the outer peripheral surface of the insulating spacer 10, and leakage from the insulating spacer 10 as an insulating member to the outside is performed. Detects the incoming electromagnetic wave and makes the loop-shaped antenna 15
A method of measuring the presence / absence of an electromagnetic wave based on partial discharge by a measuring instrument through two conductors 16 drawn from both ends of the loop.

[0004]

Conventionally, there is a method for detecting the presence or absence of a partial discharge by detecting electromagnetic waves leaking from the insulating spacer by using the insulating spacer having the above-described structure. In this case, if the partial discharge is very small, the electromagnetic wave leaking from the circumferential outer edge portion of the insulating spacer is attenuated while propagating in a uniform mold resin of the same material.
Therefore, in order to improve the detection sensitivity, a sensor such as an antenna with high sensitivity and high gain is required.

[0005] In recent years, the GIS has been reduced in size.
There are also problems that interference with the S body occurs and that mounting work to existing equipment is difficult in terms of installation space.

[0006] In some cases, the outer peripheral surface of the insulating spacer is covered with a grounded metal flange. In this case, the mold resin surface is exposed only on the gate for casting the mold resin. Since the gate is very small, the electromagnetic wave leaking therefrom is very small, and the detection sensitivity for partial discharge is significantly reduced.

Accordingly, the present invention has been made in view of such a problem, and has as its object to provide an insulating spacer capable of efficiently detecting leakage electromagnetic waves from inside even with a small antenna.

[0008]

According to the present invention, there is provided a molding resin constituting a main body of an insulating spacer and a part of the molding resin penetrating from a thickness direction of the insulating spacer to an outer peripheral portion in a circumferential direction. And a low dielectric member made of a member having a lower dielectric constant than the molded resin.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the insulating spacer 1 includes a molding resin 4, a low dielectric member 2, a bus 5, and the like, and supports the bus 5 insulated in a grounded metal container 3. The outer edge of the insulating spacer 1 is directly exposed to the atmosphere. The low dielectric member 2 having a circular opening having a dielectric constant lower than that of the mold resin 4
Are arranged so as to penetrate from the thickness direction of the insulating spacer 1 to the outer peripheral portion in the circumferential direction.

By configuring the insulating spacer 1 in this manner, it becomes possible to efficiently radiate an electromagnetic wave due to a partial discharge generated inside the GIS to the outer edge of the insulating spacer. Hereinafter, the operation will be described in detail.

The electromagnetic wave generated by the partial discharge generated due to the insulation abnormality inside the GIS acts as a coaxial waveguide by the ground metal container 3 and the bus 5 of the GIS, and propagates inside the GIS. The propagated electromagnetic wave reaches an insulating spacer which defines a gas section of the GIS and insulates and supports the conductor. Since the insulating spacer 1 is an insulator, the electromagnetic wave enters the insulating spacer 1. Then, the molding resin 4 of the insulating spacer 1 is S
Since the permittivity is higher than that of F6 gas, the transmitted electromagnetic wave is reflected to some extent.

The electromagnetic wave generated in the GIS as described above reaches the low dielectric member 2 having a circular opening in the thickness direction of the insulating spacer 1 and enters the low dielectric member 2. Inside the low dielectric member 2, since the dielectric constant is different at the boundary surface with the mold resin 4, the electromagnetic wave is reflected by the mold resin 4. Is guided to the outer peripheral edge of the insulating spacer.

Next, a case where a metal flange 91 is provided on the outer periphery of the insulating spacer will be described with reference to FIG.

The molding resin 41 of the insulating spacer 11 is
It is known that when used outdoors, it is deteriorated by ultraviolet rays. Therefore, a metal flange 91 may be provided on the outer periphery of the insulating spacer 11 in order to avoid exposing the mold resin 41 to the outside of the GIS. Such an insulating spacer 11 includes a metal flange 91 and a molding resin 41.
A gate 81 for pouring resin into the metal flange 91 is provided in order to cast the resin integrally. Therefore metal flange 91
Only the gate 81 is where the mold resin 41 is directly exposed from outside.

As shown in FIG. 2, the insulating spacer 11
The bus 51 is insulated and supported in the grounded metal container 31. The outer peripheral surface of the molding resin 41 of the insulating spacer 11 is
Only the gate 81 used for casting the mold resin 41 is directly exposed to the atmosphere. A low dielectric member 21 having a dielectric constant lower than the dielectric constant of the molding resin 41 is provided in a part of the molding resin 41 so as to penetrate from the thickness direction of the insulating spacer toward the gate 81 on the outer peripheral edge in the circumferential direction. I have.

As described above, the electromagnetic wave generated by the partial discharge generated in the GIS reaches the low dielectric member 21 having the circular opening in the thickness direction of the insulating spacer 11, and is transmitted to the low dielectric member 21. invade. In the low dielectric member 21, since the dielectric constant is different at the boundary surface with the mold resin 41, the electromagnetic wave is reflected by the mold resin 41. Is guided to the gate 81 at the outer peripheral portion of the insulating spacer 11 in the outer shape.

Next, a method of measuring a partial discharge from the outside in the insulating spacer having such a configuration will be described with reference to FIG.

An electromagnetic wave generated by the partial discharge can be detected by, for example, a loop-shaped antenna 100. The electromagnetic wave leaking from the insulating spacer 1 to the outside is caused by the antenna 100 installed in a place where the circumferential outer edge of the molding resin 4 of the insulating spacer 1 is exposed to the outside.
Is detected by The signal detected by the antenna 100 is subjected to GIS by measuring the intensity and frequency distribution with a measuring instrument.
It can be determined whether or not a partial discharge has occurred inside.

The detection sensitivity of a loop-shaped antenna improves as the size of the loop increases. However, in the actual GIS, since the exposed portion of the mold resin is small, the size of the antenna loop is limited. Therefore,
Electromagnetic waves leaking from the insulating spacer configured as described above to the outside, because the electromagnetic field per area becomes stronger than the case where the electromagnetic waves of the conventional mold resin only diverge,
Even with a small loop antenna, the detection sensitivity of electromagnetic waves due to partial discharge can be improved.

Since electromagnetic waves are measured outside the GIS, it is necessary to take measures to cover the antenna section with a metal container as a measure against external noise.

As described above, in the present invention,
The GIS is provided with a mold resin constituting the main body of the insulating spacer, and a low dielectric member disposed in a part of the mold resin so as to penetrate from the thickness direction of the insulating spacer to the outer peripheral portion in the circumferential direction. An electromagnetic wave generated by a partial discharge generated inside can be efficiently detected by providing a small antenna outside the GIS.

[0022]

As described above, it is possible to efficiently detect the electromagnetic waves generated by the partial discharge generated inside the GIS, and to reduce the size of the antenna.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the configuration of an insulating spacer for a gas insulated switchgear of the present invention.

FIG. 2 is a diagram showing an example in which a metal flange is provided on an outer peripheral surface in the configuration of the insulating spacer for a gas insulated switchgear of the present invention.

FIG. 3 is a diagram showing an example of a configuration in the case where a partial discharge is detected externally in the insulating spacer for a gas insulated switchgear of the present invention.

FIG. 4 is a diagram showing an example of the configuration of a conventional insulating spacer for a gas insulated switchgear.

FIG. 5 is a diagram showing an example of a configuration in a case where a partial discharge is detected externally in a conventional insulating spacer for a gas insulated switchgear. 1, 10, 11 Insulating spacer 2, 21, Low dielectric member 3, 30, 31 Grounding metal container 4, 41 Mold resin 5, 50, 51 Bus 16 Conductor 81 Sluice 91 Metal flange 100 Antenna

Claims (1)

[Claims] 1. An insulating spacer for insulating and supporting a bus in a grounded metal container of a gas insulated switchgear, wherein a molding resin forming a main body of the insulating spacer, and a part of the molding resin in a thickness direction of the insulating spacer. And a low dielectric member made of a member having a lower dielectric constant than the mold resin, the insulating spacer being provided so as to penetrate from the mold resin to the outer peripheral portion in the circumferential direction.