Research on Residual Magnetism Elimination and Measurement Technology for Ultra-High Voltage Converter Transformers

In order to solve the problems that existing residual magnetism elimination technology cannot completely eliminate residual magnetism, the test time is long, and the residual magnetism cannot be quantified. Based on the structural characteristics and excitation characteristics of UHV converter transformer, this paper proposes a residual magnetism elimination method of iron core of converter transformer based on residual magnetism energy offset technology, and uses excitation inductance measurement method to carry out quantitative evaluation of residual magnetism. The instrument to measure and eliminate residual magnetism of converter transformer is developed. The engineering application verifies the effectiveness of the method of residual magnetism measurement and elimination.