For that the transient zero sequence currents are used only, the criterion is immune to the abnormity of the PT, and it can be applied to all kinds of the neutral indirectly grounded systems.
由于只用到暂态零序电流量，该选线判据不受PT异常情况的影响，可以适用于任意方式的不直接接地系统。
Also interference with telephone circuit is reduced because of the absence of zero-sequence currents.
由于无零序电流，对电话线路干扰的影响也降低。
Also interference with telephone circuit is reduced because of the absence of zero-sequence currents.
由于无零序电流，对电话线路干扰的影响也降低。
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