基于2次硬件移相的新型变压器差动保护电流相位补偿方案

A new current phase compensation scheme for transformer differential protection based on twice hardware phase shifting

通过分析YNd3、YNd7与YNd11变压器或YNd5、YNd9与YNd1变压器低压侧各相电流相位规律,利用YNd11与YNd5、YNd1与YNd7、YNd9与YNd3变压器低压侧各相电流相位关系为反相的相位特征,以及YNd11与YNd1之间的相位特征,提出了2种基于2次硬件移相的新型变压器差动保护电流相位补偿方案。即改变变压器保护外部电流回路接线的2次硬件相位补偿,使YNd11、YNd3、YNd7接线或YNd1、YNd5、YNd9接线变压器差动保护的电流相位补偿问题,转变为已有的YNd1或YNd11接线的差动保护相位补偿问题,并通过现有的YNd1或YNd11微机变压器差动保护装置软件相位补偿实现YNd全系列接线形式的变压器差动保护电流相位补偿。该方案简单实用,不需要单独设置其他形式接线变压器的差动保护软件电流相位补偿。

By analyzing the phase law of each phase current on the low-voltage side of YNd3,YNd7 and YNd11transformers or YNd5,YNd9 and YNd1 transformers,using the phase characteristics that the phase relationship of each phase current on the low-voltage side of YNd11 and YNd5,YNd1 and YNd7,YNd9 and YNd3 transformers is reversed phase,and the phase characteristics between YNd11 and YNd1,two new transformer differential protection current phase compensation schemes based on twice hardware phase shift are proposed.That is,change the secondary hardware phase compensation of the external current circuit wiring of the transformer protection,so that the current phase compensation of the transformer differential protection with YNd11,YNd3,YNd7 wiring or YNd1,YNd5,YNd9 wiring can be changed into the phase compensation of the existing differential protection with YNd1 or YNd11 wiring,And through the existing YNd1 or YNd11 microcomputer transformer differential protection device software phase compensation,the current phase compensation of transformer differential protection in the form of YNd full series wiring is realized.The scheme is simple and practical,and there is no need to set the current phase compensation of differential protection software of other forms of connected transformers separately.