System for on-line detection of winding deformation based on overvoltage signal and response of transformer

Abstract

The invention discloses a system for the on-line detection of winding deformation based on the overvoltage signal and response of a transformer, and belongs to the field of on-line monitoring of power equipment. The system comprises a coupling voltage-dividing unit, a signal collection unit, a signal processing unit, and a man-machine interface unit. The coupling voltage-dividing unit comprises a transformer overvoltage capacitive-coupling sensor, a voltage-divider low-voltage arm, and a voltage-divider matching part. The transformer overvoltage capacitive-coupling sensor is shaped like a band, and is tightly attached to a part, close to a flange, of an end screen of a transformer bushing in a winding mode. The voltage-divider low-voltage arm employs a plurality of capacitors of the same type, and the plurality of capacitors are arranged in a coaxial and symmetrical manner and are connected in series to form the voltage-divider low-voltage arm. The voltage-divider matching part employs a structure where the tail and head ends of coaxial cables are matched. The system can achieve the real-time detection of a transformer winding, can accurately judge the deformation condition, sends out early warning, and effectively guarantees the safe and reliable operation of the transformer.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power equipment, in particular to an on-line detection system for winding deformation based on transformer overvoltage signals and responses. Background technique [0002] The transformer is an important equipment in the power system. Its safe and stable work is of great significance to ensure the safe, economical and reliable operation of the power system. It is particularly prominent in the context of growth. According to the statistics of maintenance after transformer faults, transformer winding deformation accounts for a large proportion of all faults. During the transportation and operation of the transformer, due to the action of mechanical force and electric force, the winding will undergo slight irreversible deformation, which will lead to internal insulation damage and partial discharge of the transformer, which will further damage the insulation performance of the transformer and re...

AI Technical Summary

Problems solved by technology

[0005] In view of this, aiming at the shortcomings of the existing online detection system for winding deformation of power transformers, an online detection system for winding deformation based on transformer overvoltage signals and responses is provided; the invention has the advantages of simple device, easy installation, and great influence on transformer structure. Small size, able to realize online detection, etc.

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