The way of neutral grounding in 380V LV distribution system was introduced and the characteristics of grounded and non grounded systems were analyzed.

本文介绍了380V低压配电系统中性点的接地方式，分析了接地与不接地系统特性。

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In view of energy, the different frequency band is chosen corresponding to the distribution system with the different neutral grounding mode.

对于中性点接地方式不同的配电网，按照能量的观点，选择不同的频带来实现故障选线。

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In view of energy, using waveform recognition, the different frequency band is chosen corresponding to the distribution system with the different neutral grounding mode in SFB.

对于中性点接地方式不同的配电网，按照能量的观点，在SFB频段内选择不同的频带利用波形识别技术来实现故障选线。

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