On-line power transformer winding deformation monitoring method based on Lissajous characteristics

Abstract

The invention aims to solve the problem of on-line monitoring of transformer winding deformation failure and provides an on-line power transformer winding deformation monitoring method based on Lissajous characteristics. The invention adopts the technical scheme as follows: the method comprises the following steps: 1), after input voltage U1 is added on the input end of a normal transformer with the load of ZL, the on-line output voltage U2, input current I1 and output current I2 of the normal transformer are measured; 2), after the input voltage U1' is added on the input end of a to-be-measured transformer with the load of ZL', the on-line output voltage U2', input current I1' and output current I2' of the to-be-measured transformer are measured; 3), the output current I2' is corrected, so that the corrected output current I21 is obtained; 4) the data is processed; 5), Lissajous figures of the normal transformer and the to-be-measured transformer are constructed; 6), the characteristic values of Lissajous figures of the normal transformer and the to-be-measured transformer are extracted; 7), contrastive analysis is performed on the characteristic values of the Lissajous figures of the normal transformer and the to-be-measured transformer.

Description

technical field [0001] The invention belongs to the field of deformation fault detection of power transformer windings. Background technique [0002] The transformer is one of the most important equipment in the power system. It undertakes important functions such as power conversion and transmission, and is the hub of the entire power grid. Therefore, the normal operation of the transformer is directly related to the reliable operation of the entire power grid. Winding deformation fault is one of the most important fault types of transformers, and it is a cumulative process. Therefore, monitoring winding deformation faults is an important means to ensure the normal operation of transformers. [0003] In the field of transformer winding deformation fault detection, detection methods such as short-circuit reactance method, winding capacitance method and frequency response method have been proposed. The technology is relatively mature, and there are already relevant regulatio...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to solve the problem of online monitoring transformer winding deformation fault

Images