JPH0215522A - Insulating material barrier connecting method of electric apparatus - Google Patents

Abstract

PURPOSE:To heighten the capacity to prevent the surface discharge progress of the connecting part as well as the dielectric strength by using an insulator for connecting with its cross section approximately Z formed covering the barrier ends of divided insulators. CONSTITUTION:The ends of insulators 1, 2 are covered respectively as well as connected using an insulator 6 with its cross section approximately Z formed. In the case there occurs electric discharge progress that approaches the tapered face, the insulator 6 should be penetrated or the proceeding direction should be altered along the tapered face. Because the higher electric field is needed for the through dielectric breakdown compared to the surface breakdown and moreover the surface length is enlarged by the sudden alteration of the discharge proceeding direction, the discharge progress capacity is lowered, that is, the breakdown potential is heightened. The dielectric strength of the insulator barrier connecting part as well as the insulating performance of an apparatus are thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for connecting insulation barriers of electrical equipment.

[Conventional technology]

FIG. 4 is an enlarged sectional view showing a conventional barrier connection part,
In the figure, reference numerals 112 indicate insulator barriers of electrical equipment that are tapered so as to be lap-connected to each other. Next, FIG. 5 is a partial sectional view of an insulator barrier structure using an oil-immersed transformer as an example, and 4 in the figure is an iron core at ground potential. Note that the insulator barrier is composed of multiple layers and insulates between the fill and the iron core.

As described above, the multi-layer insulation barrier installed on the inner and outer circumferences of the high voltage coil is divided into corner parts and straight parts. For added strength, a tapered wrap connection is used instead of a butt connection.

[Problem to be solved by the invention]

The conventional connection part is constructed as described above, and although the butt joint has a good ability to prevent the progress of discharge, the ability to prevent the progress of creeping discharge on the tapered surface is in the direction of the arrow in Fig. 4. The disadvantage was that the discharge progress was low compared to the electric discharge progress caused by

This invention was made in order to solve the above-mentioned problems, and aims to provide an insulation barrier connection method that can improve the ability of the connection part to prevent the progress of creeping discharge and provide equipment with high dielectric strength. purpose.

[Means to solve the problem]

The ends of the two insulators to be wired are each covered, and the cross section sandwiched between the two insulators is connected using an XZ-shaped insulator.

[Effect]

In this invention, the sandwiched insulator is configured to cover the tip of the path of progress of one creeping discharge, so that the progress of the discharge is prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 112 is a tapered insulator barrier, and 6 is a connecting insulator sandwiched between them and having an SZ-shaped cross section. This connection insulator 6 has a structure that covers the acute angles of each tapered barrier, so if, for example, a discharge develops from the direction of the arrow mark in the figure, even if it enters the tapered surface. It becomes necessary to penetrate the insulator 6 or change the traveling direction along this.

Normally, through-hole dielectric breakdown of an insulator barrier requires a higher coefficient of resistance than creepage breakdown, and a sudden change in the direction of discharge increases the creepage length, causing a relative change in the direction of the electric field that accelerates the discharge. Since it is reversed, the discharge progressing ability decreases. That is, the breakdown voltage is improved.

In the above embodiment, an insulating barrier having an angular shape is shown, but a channel-shaped insulating barrier as shown in FIG. 8 may also be used, and in either case, the above-mentioned effect can be achieved in the cross section of each lap portion.

〔Effect of the invention〕

As described above, according to the present invention, the dielectric strength of the insulator barrier connection portion and the insulation performance of the device can be significantly improved by simply adding a simple connection insulator.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 8 is a perspective view showing another embodiment of the invention, and FIG. 4 is a conventional insulator barrier. FIG. 5 is a cross-sectional view showing a connecting portion, and FIG. 5 is a cross-sectional view showing a barrier configuration using an oil-immersed transformer as an example. In the figure, 1.2 is an insulator barrier, and 6 is a connection insulator. Note that the same reference numerals in the figures indicate the same or equivalent parts. l, 2: Afternoon trip to other areas V 61! #1121 No. 32 No. 2- Fig. 4 No. 5r: lfJ

Claims (1)

[Claims] In connecting the divided insulator barriers, a connection insulator having a Z-shaped cross section is used, which is sandwiched between adjacent insulator barriers on both sides and covers the ends of both insulator barriers. Insulator barrier connection method for electrical equipment