多绕组变压器副边短路故障保护策略分析

针对多绕组移相变压器单个绕组短路故障难于检测的问题,介绍了基于原边三相电流及三相电压采样的故障判断方法.该方法通过计算原边电流无功及负序分量,能够及时判别变压器副边短路故障.理论仿真及实际测试结果表明,该方法可实现多绕组变压器副边短路的快速保护.

Short Circuit Fault Protection Strategy Analysis of Secondary Side of Multi-winding Transformer

The protection of short-circuit fault at the secondary side of a multi-winding transformer is very difficult. To solve this problem,a fault judgment method based on the voltage and current sampling of the primary side of the transformer was introduced. This method can output the working status of the transformer in time by calculating the reactive power and negative sequence current components of the primary side. Theoretical simulation and actual test results show that this method can realize rapid protection of the secondary side short circuit of the multi-winding transformer.