此设定定义一个特殊量作为参考相量。装置首先确定是否在设定的源上显示相VT组，如果显示,则电压通道的VA就作为相角的参考量;否则,装置就查找是否有辅助VT组显示，如果有，辅助电压就作为相角的参考量;否则，依次查找是否有相CT和接地CT组显示。如果保护装置的预选交流信号不可测量,各个相角就不能定出。这些相角以超前方向为正值,滞后方向为负值。这样更接近于电力系统中测量惯例。
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