On-line measurement method and on-line measurement system for deformation of transformer winding

Abstract

The invention belongs to the technical field of electrical power systems, and particularly relates to an on-line measurement method for deformation of a transformer winding. Because change conditions of a short-circuit reactor of the transformer directly reflect the degree of deformation of the transformer winding. An on-line detecting principle comprises that an equivalent short-circuit impedance value of the transformer is deduced according to a T-type equivalent circuit model of the transformer, on the basis, a short-circuit reactance value of the transformer is calculated, a data acquirer is used for acquiring voltage and current signals of a primary end and a secondary end of the transformer, the acquired voltage and current signals are subjected to numerical calculation, finally, the voltage and current signals which are subjected to numerical calculation are calculated according to a curve-fitting principle, and on-line measurement of short-circuit reactance of the transformer is realized. By the measurement method, the short-circuit reactance of the transformer can be measured accurately, and the deformation condition of the transformer winding can be accurately judged.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an on-line measurement method for transformer winding deformation, and also relates to an on-line measurement system for transformer winding deformation. Background technique [0002] During the operation process, the transformer is subjected to short-term short-circuit current impact and collision during transportation, etc., which will cause mechanical deformation of the transformer winding. Transformer winding deformation is a major hidden danger to the safe operation of power transformers. The geometric dimensions of the windings directly change, and the insulation distance changes. When overvoltage occurs, inter-turn and inter-cake breakdown will occur, resulting in transformer damage. When a slight deformation of the winding that does not affect the normal operation of the transformer occurs, the mechanical performance decreases, the ability to withstand short-circuit...

AI Technical Summary

Problems solved by technology

At present, the measurement methods of transformer winding deformation mainly include: low-voltage pulse method, frequency response method, short-circuit impedance method, these methods are still in the offline measurement stage, and cannot realize online detection

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