行波反射法在变压器绕组匝间短路故障定位中的应用

Application of the traveling-wave reflection method in inter-turn short fault location for transformer

针对变压器绕组轻微匝间短路难以检测的问题,提出利用行波反射波的电压幅值进行匝间短路故障定位的方法。通过在变压器绕组线端输入单个低压脉冲以获取行波反射信号,从采集到的行波反射信号中提取相应的波峰电压幅值,以此作为故障诊断的电气量。根据匝间短路后对应匝波阻抗改变引起的反射电压突变,来实现匝间短路故障定位。仿真结果表明所提方法简单可行。

Aiming at the problem that the transformer winding is difficult to detect the fault of the inter-turn short circuit, the method of using the voltage amplitude of the traveling wave reflected wave to locate the fault location is proposed. It inputs a low voltage pulse into winding wire end to obtain the traveling wave reflection signal and extracts the traveling wave reflected signal from the peak voltage amplitude, which is used as the electric quantity of the fault diagnosis. According to the change of the reflected voltage caused by the turn to turn short circuit, the fault location of the inter-turn short circuit fault is realized. The simulation result shows that the proposed method is simple and feasible.