A simulating research on monitoring of winding deformation of power transformer by on-line measurement of short-circuit reactance

Abstract

A novel strategy for monitoring the state of povcer transformer windings by on-line measurement of short-circuit reactance is studied on a model transformer in lab condition The results and their comparisons with those obtained in out-of-service condition show that the on-line method is able to detect short-circuit reactance variations with high degree of accuracy, precision and good stability, and therefore can be used for diagnosis of deformation in the transformer windings The changes of the operation condition of transformer and the external factors, such as the field interference, do not exert an effective influence to the results.

Determination of Transformer Winding Radial Deformation Using UWB System and Hyperboloid Method

“…However, the results show that the proposed algorithm can efficiently detect the exact location of the deformation on the transformer winding. Calculated Locations by (13), (14), (15), (16) and (17) …”

“…There are many transformer monitoring methods such as short circuit test method, frequency response analysis method and low voltage impulse test method [8]- [10]. The short circuit test method is based on measurement of the short-circuit reactance [11]- [13]. It can be performed on-line, simultaneously with the operation of the transformer, but does not provide any information about Manuscript submitted January 07, 2014.…”

Determination of transformer HV winding axial displacement occurrence, direction, and extent using time‐domain analysis of UWB signals

“…Two important types of mechanical defects may occur in winding, namely radial deformation (RD) and axial displacement (AD). Various monitoring methods including short circuit test [5,6], frequency response analysis (FRA) [7][8][9][10], low-voltage impulse test [11,12], and ultra-sonic [13,14] methods have been proposed. Among them, the FRA method has been investigated from different aspects.…”