Study on on-line Detecting of Deformation of Transformer Winding
Shibin Gao · Journal of the China Railway Society · 2004
The domestic and oversea research and statistics indicate that transformer winding deformation is a hidden trouble for the safe running of the electric power system, and the method via measuring the short-circuit reactance of the power transformer to estimate the deformation is effective. Two kinds of methods for detecting the winding deformation of the power transformer are proposed in the paper. These methods are based on on-line monitoring of primary and secondary currents and voltages to carry out real-time computation of the short-circuit reactance of windings. The on-line monitoring scheme is designed for traction transformers with the main type of connection used on electric railways. The effects CT and PT errors, hysterics and load variation on short-circuit reactance are discussed also. The proposed methods have been proved feasible in engineering.