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The healthy line is unloaded for zero-sequence component when a single-phase fault occurs in a non-solid earthed network.
小电流接地系统发生单相接地故障时，对零序分量而言，非故障线路相当于空载。
This method can be used to specify the cross-phase fault and single line fault of the parallel line as well as cross-pole fault.
该方法的特点是考虑了同杆双回线的跨线故障，能够确定同杆双回线中的单回线的故障回路以及跨线故障，并且物理意义明确。
The lab experiments showed that under the single phase fault status, the system could be accurate and reliable to detect the fault line and to drive the trip.
经实验室试验证明该系统在单相故障状态下能准确可靠地检测出故障线路并驱动跳闸。
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