Actual Measurement and Analysis of Power Transformer Dynamic Stability Diagnosis by Low Voltage Reactance Method Based on Short Circuit Test Check

With the continuous development of power system, transformer, as the key equipment in power system, plays an increasingly important role, and its safe operation is directly related to the reliability of the whole power system. In this paper, the relationship between transformer winding deformation degree and short-circuit reactance variation is discussed by electromagnetic calculation method. Through the electromagnetic calculation of transformer leakage reactance, the specific expression of winding reactance is given, which shows that transformer winding deformation will inevitably lead to the change of short-circuit reactance. The theoretical basis of measuring reactance and no-load current and other related parameters by low-voltage method before and after transformer short-circuit current impact, in order to diagnose whether the winding and core have abnormal changes, and the practical significance of carrying out the above detection are expounded.