Research on Winding Deformation Detection and Diagnosis Technology of Power Transformer

Abstract

With the continuous increase of power grid capacity, transformer damage accidents caused by short-circuit faults are on the rise. Timely and effective measurement of transformer winding deformation can effectively prevent further deterioration of transformer deformation and ensure that transformer does not occur accidents. This paper summarizes the methods, principles, influencing factors and judging criteria of winding deformation detection, and summarizes the important research results in the field of transformer winding deformation in recent years. Finally, this paper compares different detection methods from the aspects of detection methods, influencing factors of test results, detection information, detection sensitivity, deformation judgment methods and detection standards.

Comparison of Analytical Method and Different Finite Element Models for the Calculation of Leakage Inductance in Zigzag Transformers

“…B zig , D zig , and B 1 , D 1 are the radial depth and mean diameter of the zig winding and the radial depth and mean diameter of the gap between LV and zig winding. Figure 1 shows the geometrical dimension of the equations from (8) to (18).…”

“…The change in the dimension of the transformer winding can significantly affect the leakage reactance, resulting in the change in the short-circuit current and the short-circuit impedance of the transformer [8]. The size of the internal winding can also be determined by leakage reactance [9].…”