通过故障录波检查变压器差动回路接线以及系统试验方法

Transformer differential circuit connection checked by fault recorder and system test method

变压器的差动保护容易出现CT极性接反、相序错误以及端子接触不良等问题,通过对典型Y/△-11变压器差动二次接线问题以及P63X保护原理的分析,在变压器投运前,接入380V交流电源模拟实际运行,配合差动保护内部的故障录波功能,能够快速全面地检查差动二次回路,确保差动保护动作的正确性。

Bad contact, phase sequence error, polarity error, etc are easy to occur in transformer differential protection.Through analyzing the typical Y/△-11 transformer differential secondary connection and the principle of protection P63X, the 380V AC power is used to simulate the practical operation before the transformer is put into use. With the function of fault recorder in the protection, this method can check differential secondary connection quickly and completely and ensure the validity of differential protection.