GB2225176A

GB2225176A - High-voltage suspension insulator

Info

Publication number: GB2225176A
Application number: GB8826992A
Authority: GB
Inventors: Alexandr Borisovich Zlakazov; Evgeny Ivanovich Shinkevich; Anatoly Alexandrovich Zima
Original assignee: SP KT BJURO IZOLYATORAM I ARMA
Current assignee: SP KT BJURO IZOLYATORAM I ARMA
Priority date: 1988-11-18
Filing date: 1988-11-18
Publication date: 1990-05-23
Also published as: AU606485B2; AU2638288A; GB8826992D0

Abstract

An insulator comprises an insulating element (1), a cap (4), a pin (5) and an annular spacer (7) made of an elastic material. The inner surface (8) of the spacer (7) conforms to the outer surface of the insulating element (1), whereas the outer surface (9) thereof corresponds to the shape of the inner surface of the cap (4). The head (2) is connected to the pin (5) and to the cap (4) by a bond (6). The spacer may be provided with three radial grooves (10, Fig. 2). The spacer (7) ensures the correct alignment of the cap (4). <IMAGE>

Description

HIGH-VOSThGE SUSPENSION INSULATOR This invention relates to electric insulators and, more particularly, to high-voltage suspension insulators.

The invention can be used with success in high-voltage power transmission lines.

An increasing use of power transmission lines, as well as the ever growing voltages and powder transmitted impose high demands on the reliabIlity and fail-safe operation of high-voltage suspension insulators.

There are known high-voltage suspension insulators (cf., V,D,Abramov and M.V.Khomyakov "Ekspluatatsia izolyatorov vysokogo napryazhenia", in Russian, 1976, the Eneria Publishers, Moscow, p.30; SU, A, 1,967,G54) comprising coaxially arranged an insulating element including a head with a plate, an insulator cap and a rod interconnected by a bond.

The cap and insulating element are positioned so that at a location where the head extends into the plate an air clearance is formed normally filled with a fibrous material to reduce radio-frequency interference. This clearance is provided to prevent the insulating element from contacting the insulator cap, and avoid damage thereof caused by a difference in coefficients of linear expansion between the materials of the cap and insulating element.

However, such insulators are susceptible to skewing of the insulator cap relative to the head of the insulatiIlg element during assembly, which can affect the mechanical strength of the insulator.

There is also known a high--Jcltage suspension insulator (cf., SU, A, 1,512,583) comprising cnaxially arranged an insulating element including a head and a plate made as an integral unit, an insulator cap embracing the head, a rod secured inside the head, and an annular spacer fabricated from an elastic material and having the form nf a flat washer disposed at the location where the heat extends into the plate, the head of the insulating element being connected to the rod and cap by a bond.

This construction of the insulator is also disadvantageous due to susceptibility of the insulator cap to skewing and radial displacement relative to the head of the insulating element. This disadvantage results in reduced mechanical strength of the high-voltage suspension insulator and makes the insulator less reliable in operation.

The invention aims at providing such a high-voltage suspension insulator in which an annular spacer would be so constructed as to prevent displacement and skewing of the insulator cap relative to the head of the insulating element to thereby increase the mechanical strength and improve operational reliability of the insulator.

The object of the invention is attained by that in a high-voltage suspension insulator comprising arranged coa- X v an insulating element integrating a head and a plate, a cap embracing the head, a rod secured inside the head, and an annular spacer made of an elastic materi.' and positioned at a location where the head extends into the plate, the head being connected to the rod and cap by a bond, according to the invention, the shape of inner surface of the annular spacer conforms to the shape of the outer surface of the portion of the insulating element contacting therewith at the location where the head extends into the plate, whereas the shape of outer surface of the annular spacer conforms to the shape of the inner surface of a portion of the cap contacting therewith.

Depending on the elastic properties of the material of the annular spacer and for facilitating the mounting of the annular spacer on the head of the insulating element, it is advisable that the top part of the annular spacer be provided with at least three radial grooves spaced equidistantly about its perimeter.

An increase in the mechanical strength attained through this invention ensures a more fail-safe operation and extends the service life of high-voltage suspension insulators.

The invention will now be described in greater detail with reference to a specific embodiment thereof taken in conjunction with the accompanying drawings, in which: Fig. 1 illustrates construction of a high-voltae suspension insulator, according to the invention; and Fig, 2 shows a modified form of an annular spacer of the proposed high-voltage suspension insulator.

A high-voltar- suspension insulator comprises 5- - cDaxiEllg an insulating element 1 (Fig. 1) integratinz a head 2 and a plate 3, a cap d embracing the head 2, a rod 5 secured inside the head 2, and a bond 6. An annular spacer 7 of an elastic material is provided at the loca+io..

where the head 2 extends into the plate 3. The shape of an inner surface 8 of the annular spacer 7 conforms to the corresponding shape of the outer surface of the portion of the insulating element 1 contacting therewith at the location where the head 2 extends into the plate 3, whereas the shape of an outer surface 9 of the annular spacer 7 corresponds to the shape of the inner surface of the portion of the cap 4 contacting therewith.

Provided at the top of the annular spacer 7 (Fig. 2) are at least three radial grooves 10 spaced equidistantly about its perimeter, The proposed high-voltage suspension insulator is assembled in the following manner. The annular spacer 7 is first fitted onto the head 2 to be placed at the point where the head 2 extends into the plate 3. After this the insulating element 1 is inserted by its head 2 into the interior of the cap 4 filled with the bond 6 until the latter is brought in contact with the annular spacer 7, whereas the rod 5 is fitted inside the interior of the head 2 filled with the bond 6.

Provision in the proposed high-voltage insulator of the annular spacer 7 positioned between the cap 4 and insulating element 1 facilitates centering of the cap 4, as well as prevents its displacement and skewing. This, in turn, improves the mechanical strength characteristics of high-volt age insulators and makes them more reliable in operation, Radial grooves 10 provided in the annular spacer 7 (Fig, 2) facilitate mounting this spacer 7 on the head 2 and allows to save the material of the spacer

Claims

WHAT WE ClAIM IS:

1. A high-voltage suspension insulator comprising coaxially arranged an insulating element integrating a head and a plate, a cap embracing the head, a rod secured inside the head, a bond to connect the head to the rod and to the cap, and an annular spacer fabricated from an elastic material and positioned at a location where the head extends into the plate, the shape of an inner surface of the annular spacer conforming to the shape of an outer surface of the portion of the insulating element contacting therewith at the location where the head extends into the plate, the shape of the outer surface of the annular spacer conforming to the shape of the inner surface of a portion of the cap contacting therewith.

2. A high-voltare suspension insulator as claimed in Claim 1, in which at least three radial hooves are provided at the top part of the annular spacer, these grooves being spaced equidistantly about its perimeter.

3. A high-voltage suspension insulator substantially as heretofore described with reference to the accompanying drawings.