JPS63242113A - Insulating spacer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] [Industrial Field of Application] The present invention relates to an insulating spacer, and particularly to a gas insulated switchgear or a pipe pipe in which an insulating gas such as SFr or gas is used as an insulating medium. This article relates to improvements in insulating spacers used in power transmission equipment, etc.

[Conventional technology]

In gas-insulated switchgear and pipeline aerial power transmission equipment, high-voltage conductors are insulated and supported in a grounded metal container.
Many insulating spacers are used.

This insulating spacer supports a high voltage conductor with an insulating spacer body made of thermosetting synthetic resin such as epoxy resin, as shown in Japanese Patent Publication No. 54-44106 and Japanese Patent Application Laid-open No. 55-155512. A filler metal for the mounting bolt is embedded in the flange. Furthermore, because SF and gas tend to have unequal electric fields and their insulation performance deteriorates, as a countermeasure, a grounding shield is embedded around the high voltage conductor, and this potential is connected to a grounding bracket that also serves as a bolt hole. This is normally secured through the .

The conventional insulating spacer, as shown in FIG. It is filled with gas 2. The current-carrying member 41 that connects the high voltage conductors 1 to each other is cast integrally with the insulating spacer body 4. Also, the insulating spacer 40 is the insulating spacer main body 4
A metal flange 6 is integrally cast on the outer periphery of the flange portion.

Further, a conductive ring 42 integrally cast into the insulating spacer body 4 is embedded therein. This conductive ring 42 is always grounded, reduces the electric field at the joint between the metal container 3 and the insulating spacer 4'0, and contributes to improving insulation performance. Then, both ends of the stud 7 are bolted with nuts 7a so as to pass through the flange portion of the insulating spacer 40, that is, the metal flange 6 and both the connecting flange 5 and the connecting flange 5 provided on the metal container 3. Tighten it, and also make sure that the packing groove provided in the insulating spacer body 4 has a zero
A ring-like packing 31 is housed in the connecting flange 5.
Maintains airtightness between.

[Problem that the invention seeks to solve]

However, such a conventional insulating spacer 40 has the following disadvantages. That is, since the insulating spacer main body 4 and the current-carrying member 41 are integrally cast, the adhesive strength at the interface between the insulating spacer main body 4 and the current-carrying member 41 becomes a problem. Various mechanical stresses are imposed on the insulating spacer 40.

For example, the insulating spacer 40 has metal containers 3 attached on both sides, and is susceptible to compressive stress due to the pressure difference of the insulating gas 2 within the container, impact stress during switch operation, bending stress during assembly, electromagnetic mechanical force, etc. is the main mechanical stress. In order to withstand these mechanical stresses, it is necessary to increase the wall thickness of the insulating spacer main body 4 at the portion where the current-carrying member 41 is integrally cast. In addition, as shown in FIG.
The shape of No. 1 is convex. This is to improve the creeping performance of the insulating spacer 40.

In this way, the more complicated the shape of the current-carrying member 41, the more
When the insulating spacer 40 is cast, the stress distribution between the insulating spacer main body 4 and the current-carrying member may become uneven, and the adhesive strength may decrease. Therefore, it is necessary to improve the manufacturing technology for surface treatment of the first current-carrying member 41, which leads to an increase in the cost of the insulating spacer 40 accordingly. Furthermore, 10,000 - m shown in Figure 2
When separation occurs at the interface between the insulating spacer main body 4 and the current-carrying member 41 in the A'' portion, a minute gap is formed at that part. In this state, the electric field at the minute gap increases extremely (for example, when the insulating spacer (double the dielectric constant of the casting resin of the main body 4), which may impair the insulation performance of the insulating spacer 40.

If the insulating spacer in which the current-carrying member 41 is integrally cast as described above encounters an unexpected situation such as interfacial peeling, the mechanical and electrical strength may decrease and the original function of the insulating spacer 40 may be impaired.

Therefore, in the insulating spacer 40, there has been a demand for an insulating spacer having a structure in which the shield electrode for electric field relaxation, which is integrally formed, has a low stress strain and high adhesive strength. The present invention was made in view of the above circumstances, and includes a structure of an insulating spacer,
The purpose of the present invention is to provide an insulating spacer that takes into consideration mechanical and electrical performance without significantly changing the shape.

[Structure of the invention]

[Means for solving the problem] In order to achieve the above object, the present invention provides a gas-insulated switchgear in which a high-voltage conductor is constructed of a metal container, and a gas-insulated switchgear in which a high-voltage conductor is insulated and supported in a conduit aerial power transmission line. The insulating spacer is characterized in that the surface roughness of the flat portion of one current-carrying member is greater than the surface roughness of the central protrusion.

[For production]

With the structure of the insulating spacer of the present invention, peeling is unlikely to occur at the interface between the insulating spacer body and the current-carrying member, the electrical performance is not degraded, and the mechanical strength is high.

improves. Furthermore, by roughening the surface of the flat part of the current-carrying member, the central protrusion can be enlarged, and the creeping electric field at the joint between the insulating spacer and the current-carrying member can be alleviated, making it suitable for gas-insulated switchgear and conduit aerial power transmission lines. It can be said that it is preferable in terms of practical performance as an insulating spacer for use.

〔Example〕

Hereinafter, one embodiment of the insulating spacer of the present invention will be described with reference to FIG. The same parts and parts having the same functions as those in FIG. 2 are given the same reference numerals. That is, high voltage conductor 1
is insulated and housed in a grounded metal container 3 filled with an insulating gas 2 via an insulating spacer 40. Usually, a connecting flange 5 is provided at the end of the metal container 3 to connect the grounded metal containers 3 to each other. The insulating spacer 40 supports and arranges the high voltage conductor 1 within the grounded metal container 3 in such a manner that it is sandwiched between the connecting flanges 5. The insulating spacer 40 is constructed by sandwiching the insulating spacer main body 4 between the insulating spacer main body 4 and the current-carrying member 41 that connects the insulating spacer main body 4 and the high voltage conductor 1 with the bolts 8, and through a backing 31 such as an O-ring accommodated in a backing groove. It is tightened to maintain airtightness with the current-carrying member 41. A current-carrying member 41 is integrally cast on the high voltage side of the insulating spacer body 4.

The current-carrying member 41 has a surface roughness that is rougher than that of the flat portion (A” portion) or the central protruding portion (C1t B 19 portion).If the surface roughness of the central protruding portion (“B” portion) If the surface roughness is made rough, there is a risk of deterioration of insulation performance due to the high electric field area.Therefore, the surface roughness of the flat part (A 11 part) is set to 1. 15 μs to 25 μs to strengthen adhesion. has been in the range.

Further, the following relationship is required between the height ff1) of the flat section of the current-carrying member 41 and the height d) of the central protrusion.

That is, ゛(A 39. Between the "'B" parts - When roughened, d
/12≦1, but by making the “A” portion rougher than the “B” portion, d/Q≧1 can be achieved.

Therefore, the height of the central protrusion of the first current-carrying member 41 can be increased, and the distance between the first current-carrying member 41 and the insulating spacer body 4 can be increased.
The creeping electric field at the joint can be alleviated. Therefore, insulation performance can be improved.

On the other hand, a conductive ring 42 is integrally cast in a portion of the insulating spacer main body 4 that is sandwiched between the connecting flanges 5 . Stud holes 9 are formed on the outer periphery of the stud holes 9 at regular intervals on the circumference so that the risk cord 7 passes through the connecting flange 5, and both ends of the stud 7 are tightened with nuts 7a. Further, the insulating spacer main body is tightened to both connecting flanges 5 through a backing puller so as to maintain airtightness.

In the insulating spacer 40 configured as in 2, the interface between the insulating spacer main body 4 and the current-carrying member 41 is less likely to peel off due to mechanical stress, etc. as in the past, and the adhesiveness is strengthened, so the mechanical strength is increased. It also improves. Also 1
Since the central protrusion of the current-carrying member 41 can be enlarged, the creeping electric field at the joint between the insulating spacer body 4 and the current-carrying member 41 can be alleviated, thereby improving insulation performance.

In the above embodiment, only a single-phase insulating spacer was described, but it goes without saying that the present invention can also be applied to a three-phase insulating spacer.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide an insulating spacer with excellent mechanical performance and insulation performance and high reliability without changing the dimensions of the conduit bus bar.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an insulating spacer according to the present invention. FIG. 2 is a longitudinal sectional view of a conventional insulating spacer. 1... High voltage conductor 2... Insulating gas 3
... Metal container 4 ... Insulating spacer body 5 ... Connection flange 6 ... Metal flange 7 ... Stud 7a ... Nut 8 ... Bolt 9 ... Stud hole 31 ... Backing 40... Insulating spacer 41... Current-carrying member 42.
・・Conductive ring agent Patent attorney Noriyuki Chika Yudo Hirofumi Mitsumata Figure 1 Figure 2

Claims (3)

[Claims] (1) A high-voltage conductor is inserted into a metal container filled with an insulating gas, and the surface roughness of the flat part of the current-carrying member is checked in an insulating spacer for gas division that insulates and supports the high-voltage conductor from the metal container. An insulating spacer characterized by having a rougher surface than that of the central protrusion. (2) In the insulating spacer, the flat portion of the current-carrying member has a surface roughness in a range of 15 μm to 25 μm. An insulating spacer according to claim 1. (3) The insulating spacer according to claim 1, wherein in the current-carrying member, the ratio of the surface roughness of the flat portion to the surface roughness of the central protrusion is 1.0 or more and 10 or less. .