“S注入法”与电压互感器的特殊接线方式

基于"S注入法"的选线定位保护新原理的TY系列选线定位保护已大量运行于国内电力系统。"S注入法"需通过电压互感器向故障系统注入检测信号,而为了消谐等目的,电压互感器有多种特殊的接线方式。对这些特殊的接线方式进行了分析,论证说明了这些特殊接线方式既能够满足消谐的需要,又适合于"S注入法"选线定位。

A S's signal injection method and special connection modes of voltage transformer

A series of TY protections based on the S's signal injection method have been widely applied to fault line selection and fault location in power systems in China. Several special connection modes of voltage transformer are needed to eliminate harmonic components because diagnostic signals are injected through voltage transformer. The special connection modes are analyzed in the paper. The modes not only meet the need of eliminating harmonic components,but also are adapt to fault line selection and fault location of the S's signal injection method.