BCH-2型差动继电器直流助磁特性的实验分析

Experimental Analysis on DC Additional Magnetic Features of BCH-2 Model Differential Relay

直流助磁特性能使BCH-2型差动继电器可靠地躲过外部短路时暂态不平衡电流的非周期分量及变压器空载投入时的励磁涌流,从而有效避免保护装置的误动作。通过直流助磁特性实验分析可知,BCH-2型差动继电器短路线圈的匝数选得越多,躲过励磁涌流的性能就越好。

The DC additional magnetic features can make the BCH -2 model differential relay to avoid reliably from the exciting surge produced by non - cycle component of transient unbalanced current under external short - circuit and put - in of idle transformer in order to prevent the protective device from maloperation. Through the experimental analysis of DC additional magnetic features it can be seen that the more turn number of the short- circuit coil of BCH -2 model differential relay is selected, its pedonnance to avoid from the exciting surge is better.