RU157606U1 - HIGH VOLTAGE INLAND WITH SECTIONED RIP - INSULATION - Google Patents

Abstract

The core of the high-voltage input, containing a metal conductive pipe, paper insulation impregnated with epoxy resin, with equalizing linings, a connecting sleeve, characterized in that the insulation of the core is made in separate sections, electrically connected by leads to each other, as well as with a conductive pipe and a connecting sleeve, which is mounted on a support cylinder mechanically connected to a conductive pipe and insulation sections with a support flange and a spring coupling assembly mounted on a conductive odyaschey pipe, with the space in the core between the conductive pipe and the support cylinder sections insulation and isolation between the sections after entering the assembly is filled with an insulating gel.

Description

The utility model relates to electrical engineering, namely, to bushings in transformers and other high-voltage apparatuses.

Solid RIP bushings are manufactured for voltages up to 500 kV.

The solid RIP insulation is made of crepe paper, which is wound on a conductive metal pipe together with leveling plates made of aluminum foil.

The wound skeleton undergoes thermal vacuum treatment, resin impregnation, cooling to ambient temperature and mechanical processing.

After fitting the connecting sleeve onto the insulation, the input assembly and its electrical tests are carried out.

In the insulation of the core during its manufacture / cooling of the core after impregnation with resin, mechanical treatment of the insulation /, as well as during cooling of the insulation at the installation site of the connecting sleeve heated to a temperature of 250-300 ° C, mechanical stresses can occur that can lead to microcracks . When operating the bushings under the influence of electric voltage, discharges occur in them,

“This is especially true for large bushings of 220 kV and above.” / Thermomechanical stresses in solid RIP insulation. Tests of high-voltage bushings 220-500 kW for resistance to external influences. Kassikhin S.D., Sipilkin K.G., Slavyanskiy A.Z., Electro 2, 2007 /.

Leveling plates in the input insulation regulate the voltage distribution in the insulation of the inputs in the radial and axial directions.

“At the sharp edges of the plates there is a very uneven field with a significant component of tension directed along the insulation layers.

The field strength at a distance Z from the edge of the electrode at Z <0.1d can be estimated by the following formula

where U is the voltage between the plates,

d is the thickness of the insulation.

/ M.A. Greysukh, G.S. Kuchinsky, A.A. Kaplan, G.T. Messerman “Paper-oil insulation in high-voltage structures”, Gosenergoizdat, Moscow-Leningrad, 1963, p. 24 /.

With increasing input voltage, the number of equalizing plates in the input increases, which means that the insulation region with a sharply inhomogeneous field increases.

The core for a voltage of 500 kV has an outer diameter of 320 mm, a length of 7.5 meters and a weight of 680 kg.

The objective of this utility model is to develop the design of the core with reduced mechanical stresses in the insulation, which should lead to an increase in the electrical strength of the insulation and increase the reliability of commissioning

The task is achieved in that the insulation of the skeleton is made in the form of separate sections, which are made according to the technology of manufacturing the skeletons with RIP insulation, but the winding of paper and leveling plates is made on mandrels made of composite material. At the end of the drying and impregnation process, as well as cooling, the mandrels are removed. After machining, the insulation section is subjected to electrical tests.

Isolation of the core for a voltage of 500 kV can be made of three sections. A new element has been added to the skeleton design. This is the support cylinder on which the connecting sleeve is mounted.

In FIG. 1 shows the core of a high voltage input with sectionalized RIP isolation.

The core comprises a conductive metal pipe 1, a support cylinder 2 with a connecting sleeve 3 mounted thereon, insulation sections 4 that are electrically connected to each other, as well as a conductive pipe and a connecting sleeve with leads 5, and a mechanical connection between the support cylinder and the conductive pipe and insulation sections implemented using the support flange 6 and the spring coupling unit 7.

The space in the core between the conductive pipe, the reference cylinder and the insulation sections, as well as between the insulation sections, is filled with insulation gel 8. The core is filled with gel after the input assembly.

Claims (1)

The core of the high-voltage input, containing a metal conductive pipe, paper insulation impregnated with epoxy resin, with equalizing linings, a connecting sleeve, characterized in that the insulation of the core is made in separate sections, electrically connected by leads to each other, as well as with a conductive pipe and a connecting sleeve, which is mounted on a support cylinder mechanically connected to a conductive pipe and insulation sections with a support flange and a spring coupling assembly mounted on a conductive odyaschey pipe, with the space in the core between the conductive pipe and the support cylinder sections insulation and isolation between the sections after entering the assembly is filled with an insulating gel.

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