SU1629946A1 - Technique for repairing electrical machine windings - Google Patents

Abstract

The invention relates to the technology of repair of electric machines with core windings and can be used in electrical engineering. The aim of the invention is to simplify the repair technology by reducing the isolation work. The method of repairing the windings of electric machines is carried out as follows. The windings are removed from the grooves of the magnetic circuit and are placed in an autoclave, in which it is heated with water vapor at a pressure of 0.25 - 0.35 MPa, a temperature of 198-225 ° C for 1 -1.5 hours, as a result of which the insulation softens and peels in places. After this, the body insulation is mechanically removed and a new body insulation is applied.

Description

The invention relates to the technology of repair of electric machines with core windings and can be used in electrical engineering.

The aim of the invention is to simplify the repair technology by reducing the isolation work.

The method for repairing windings of electrical machines is as follows.

The windings are removed from the grooves of the magnetic circuit of the electric machine and placed in an autoclave, where they are subjected to heating with water vapor (steamed) with the parameters: pressure of steam 0.25-0.35 MPa, temperature 198-225 ° С. The steaming is carried out for 1 -1.5 hours. As a result, the (outer) winding insulation is softened and sometimes peeled off, and then can be easily cleaned by mechanical methods.

The internal coil insulation of the winding is reused after inspection, i.e. the case insulation is again applied to it, after which the windings are installed in the grooves of the magnetic circuit of the electric machine. Steam pressure interval 0.25-0.35 MPa

established experimentally by test results.

With a pressure of less than 0.25 MPa, ceteris paribus, body insulation is insufficiently steamed and not peeled off. Such pressure is not enough to penetrate moisture through the inner layers of the insulation.

With a pressure of more than 0.35 MPa, moisture penetrates already into the inter-turn insulation, which is peeled off and damaged by mechanical cleaning.

The temperature range of 198-225 ° C is established experimentally. At temperatures below 198 ° C, the insulation softening process is solved.

At temperatures above 225 ° C, the process of softening the insulation does not accelerate, but damage to the coil insulation occurs.

The duration of the steaming of the windings is determined experimentally: when processing with steam for less than 1 hour, the windings do not have time to fully warm up and the insulating layer does not have time to soften;

WITH

with

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Over 1.5 hours, if possible, the magnetic circuit is increased, the windings are heated,

damage to the coil insulation. removes the insulation and overlaps

The method of repairing windings allows knowledge of insulation, characterized in that, with

simplify the repair technology with the aim of simplifying the repair technology by

by maintaining the insulation coil and replacing 5 reducing insulation work, heating

Only the cabinet winding is produced in water vapor.

Claims (1)

Claims at 198-225 ° C at pressure The method of repairing electrical windings is 0.25-0.35 MPa for 1-1.5 hours, while only the case insulation is removed from the machines by which the winding is removed.