Sishui No.2 Main Transformer Winding Fault Analysis

Abstract

Transformer Winding Fault is one of the main causes of Transformer damage. When a transformer has an outlet short-circuit accident, it flows through a large short circuit current in the transformer winding. The short circuit current generates electrodynamic force under the mutual action of the leakage magnetic field and can lead to failure of the transformer winding. Based on the analysis of the short circuit accident at the outlet of the No.2 main transformer in Sishui substation, it is very effective to judge transformer winding fault by combining the frequency response method of transformer windings with chromatographic analysis. In order to avoid the override trip accident, the cable should be changed to a fast fuse cabinet or a set of drop switches. In order to avoid the short circuit damage to the transformer, the manufacturer is required to provide the test report on the short circuit resistance of the transformer.