基于参数辨识的变压器绕组故障诊断方法的研究

变压器外部故障时,变压器内部绕组的匝数及漏磁通所经磁路均未变化,变压器绕组发生故障时,变压器漏电感肯定会发生变化。通过测量变压器的短路电抗并计算分析,可以判断变压器的绕组故障。参数辨识法诊断变压器绕组故障,即是通过测量变压器三相电压和电流量,采用递推最小二乘法,辨识变压器绕组漏抗,从而判断变压器绕组是否故障。

Research on Transformer Winding Fault Diagnosis Based on Parameter Identification

The number of turns of transformer winding and its flux leakage do not change when external fault occurs. However, inductance leakage of the transformer changes when transformer winding faults happen.Winding faults can be identified by measuring transformer short-circuit reactance and analyzing the data.Parameter identification method can be used to diagnose winding faults through measuring 3-phase voltage and current and using recursive least squares method to identify the wind reactance leakage.