用户可以选择仪表变压器的的输入通道和一些通过这些通道计算出来的参数。可用的输入参数包括多端通道的电流和。对于不同变比的三相电流，3I0 和接地电流，在求和之前将被调整为同一变比，进行求和。一个称为倚藕旁从的机构将 CT、VT 输入通道回路配置为测量子系统。在 C60 系列继电器的说明中，信号源指电流电压信号的各种逻辑组合，
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