Amorphous alloy dry-type transformer coil insulating structure and method of removing local discharge signal noise

Abstract

The invention discloses an amorphous alloy dry-type transformer coil insulating structure and a method of removing local discharge signal noise. The amorphous alloy dry-type transformer coil insulating structure comprises a coil end (1), coil segments, a coil winding (3) and an outer coil part (5), and the amorphous alloy dry-type transformer coil insulating structure is characterized in that the coil end (1) is a rectangular end ring with beautiful outline and strong mechanical strength; the coil segments are isolated by dovetail cushion blocks, so that the space is enough to facilitate the heat dissipation and complete impregnation of impregnating varnish; and the coil winding (3) is wound in a rectangular cylindrical structure, the outer coil part (5) is subjected to bundling, vacuum pressure drying, varnish impregnating and curing processes so as to guarantee uniform field intensity distribution and strong anti-short circuit capability. In the local discharge monitoring process, a sensor collects a discharge signal and sends the discharge signal to a noise analyzer, and the noise analyzer separates the periodical narrow-band interference and white noise in the noise; and compensation signals with equal compensation size and opposite polarities are compensated, a real local discharge signal can be obtained, and a technician can accurately judge the insulating problem of the amorphous alloy dry-type transformer.

Description

technical field [0001] The invention relates to power transformer manufacturing and internal insulation monitoring technology, specifically, a coil insulation structure of an amorphous alloy dry-type transformer and a method for removing noise in partial discharge signals. Background technique [0002] At present, in the amorphous alloy transformer, the coil is wound into a circular shape, resulting in a large volume and high cost of the transformer, and each layer of the coil is wound with the same number of turns, which is not conducive to heat dissipation, and is not conducive to the penetration of insulating varnish , At the same time, the coil ends are mostly insulated with traditional slanted ends, which looks unattractive in appearance and cannot meet sufficient mechanical strength. When monitoring the partial discharge inside the transformer, due to the complex environment of the operating equipment, various interferences are often encountered during monitoring, such...

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Problems solved by technology

[0002] At present, in the amorphous alloy transformer, the coil is wound into a circular shape, resulting in a large volume and high cost of the transformer, and each layer of the coil is wound with the same number of turns, which is not conducive to heat dissipation, and is not conducive to the penetration of insulating varnish , at the same time, the end of the coil is often insulated with the traditional slanted end, the appearance does not look beautiful, and it cannot meet sufficient mechanical strength

When monitoring the partial discharge inside the transformer, due to the complex environment of the operating equipment, various interferences are often encountered during monitoring, such as periodic narrow-band interference and white noise

These interferences seriously affect the sensitivity and reliability of monitoring

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