Insulating sleeve for oil filling

Abstract

This invention provides an insulating sleeve adopting a centre conductor that is made of aluminium alloy with excellent mechanical strength and low cost, at the same time, avoiding the problem of the contact resistance between the end part of the centre conductor and the jointing part of other energized terminals being increased due to the oxide layer generated on the surface of the aluminium alloy. Said insulating sleeve for oil filling includes: a porcelain sleeve in gas side, a porcelain sleeve in oil side, and an insulating sleeve body located between two porcelain sleeves for installing metal flange attachment, a centre conductor coming through said insulating sleeve body, a metal piece under the down end of said insulating sleeve being screwed with the centre conductor for connecting with the energized terminals. Where, said centre conductor includes: a centre conductor trunk covered by the oil filling insulating sleeve in full length, a top conductor at upper end of the high voltage side of said centre conductor trunk being screw by thread for connecting with the energized terminals. Said top conductor for connecting with the energized terminals and bellow metal piece for connecting with the energized terminals are made of Cu or Cu series metal. Said centre conductor trunk is made of aluminium alloy components.

Description

technical field [0001] The invention relates to an oil-filled insulating bushing. Background technique [0002] Insulating bushings used to insulate and support high-voltage power lines, etc. A porcelain sleeve is provided between the metal part on the ground side and the metal part on the high-voltage side. Its structure is such that the center conductor is penetrated at the center and insulating gas is enclosed inside. or insulating oil to ensure insulation. [0003] figure 1 An explanatory cross-sectional view showing an insulating bushing having a central clamp (center clamp) structure in which insulating oil is sealed inside to ensure insulation, disclosed by the applicant of the present application (Patent Document 1). figure 1 Among them, 1 is the gas side porcelain bushing, 2 is the oil side porcelain bushing, 3 is the metal attachment of the mounting flange located in the center of these, 4 is the center conductor, 5 is the oil-immersed paper capacitor core around...

AI Technical Summary

Problems solved by technology

If this surface preparation operation is not complete, it will cause a fire accident, so complete operation is required

However, since this operation requires skilled operation, the operator needs to carry out sufficient education and practice in advance. Since skilled operators cannot always be ensured, fires are caused by the oxide film formed on the above-mentioned connection part of the aluminum alloy central conductor. From the perspective of accident hazard avoidance, it is problematic

In addition, especially the connection of the upper high-voltage side terminal of the center conductor 4 and the top terminal 9 is related to the connection operation of the wires, and many of them are carried out on the site of the substation, and it is difficult to thoroughly carry out the above-mentioned problems of the connection part. Dealing with issues like quality management

[0009] In addition, the center conductor made of aluminum alloy has a lower melting point than the center conductor made of copper, and there is a tendency for the rate of decrease in mechanical strength to become significant as the temperature rises.

Therefore, even if the high temperature does not reach the high temperature at which the above-mentioned fire accident occurs, at a certain high temperature (over 200°C), the central conductor is mechanically destroyed due to the mechanical load generated by the above-mentioned connecting portion of the aluminum alloy central conductor. , there are dangerous problems that lead to blackouts

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