RCS-978变压器保护二次谐波制动系数整定值探讨

在《整定导则》中推荐的二次谐波制动系数为15%～20%,该制动系数是以两相涌流之差为基础分析得出的,鉴于RCS 978微机变压器差动保护对变压器各侧电流相位补偿方法的独特之处,励磁涌流在RCS 978差动保护装置中以相电流的形式出现,而非两相涌流之差,分析了《整定导则》中推荐的二次谐波制动系数用于RCS 978变压器差动保护装置时可能存在的问题。

Setting probe for coefficient of secondary harmonics suppression on RCS-978 transformer protection set

To the guide rule of calculating settings of relay protection,the coefficient of secondary harmonics suppression is 15% to 20%,which got from the difference of two-phase magnetizing inrush. Due to the single compensation of RCS-978 transformer differential protection to the current phase of each side, the excitation inrush current, in the device, appears with phase current rather than the difference of two-phase excitation inrush current. This paper analyses the possible actual problems of the coefficient for guide rule in RCS-978 transformer differential protection set.