基于系统辨识的阻抗匹配平衡变压器故障诊断

Fault Diagnosis of Impedance Matching Balance Transformer Based on System Identification

阻抗匹配平衡变压器常被用作电气化铁道牵引变电所的主变压器。为解决传统故障诊断方式难以准确鉴别该变压器内外故障,基于正常运行或发生外部故障时绕组电阻和短路电抗值不产生变化,而当出现内部故障时将产生变化的问题,提出了利用最小二乘参数估计递推算法在线辨识其变化以鉴别内外故障。实验仿真曲线证实了采用该算法能有效区分其内外故障,研究结果验证了用该方法鉴别2种不同类型故障的可行性。

Impedance matching balance transformer is tion substation transformer. In order to solve the puzzle often used as the main electrified railway tracthat could not accurately identify the failure in internal or external impedance matching transformer by traditional fauh diagnosis method, based on that the winding resistance and short circuit reactance value have not been changed in normal opera- tion for impedance matching balance transformer or external fault, the paper proposed an identification algorithm of recursive least square parameter estimation on line to distinguish the fault. The curve of experimental simulation demonstrated that it could effectively distinguish to be internal failure or external fault. The research result shows its feasibility to distinguish two sorts of different faults.