变压器比率差动保护的校验方法

Verification method of transformer percentage differential protection

Y/△变压器差动保护调试过程中,由于人员对其原理理解存在偏差,变压器斜率差动曲线的验证往往成为难点。为了防止因变压器接线组别、TA变比不同引起的不平衡电流。分析了其保护原理并总结其采用的电流补偿方法。以Y/△变压器为例介绍了校验步骤,提出了验证差动保护的方法。

In the Y/delta transformer differential protection commissioning process, because the staff exist deviations in understanding of its theory, the verification of transformer slope non-cumulative curve often become difficult. In order to prevent the unbalanced current caused by transformer connection group, TA different ratio of transformer. This paper analyzed the protection principle and summarized the current compensation method, introduced verify process based on Y/delta transformer , putted forward the verification differential protection method.