谐振接地电网的等值分析

在我国,谐振接地方式在中压电网得到越来越广泛的应用,谐振接地方式有效地遏制了电网中发生的各种瞬间接地电弧故障的发展.本文通过对这种接地方式下电流、电压分布以及电压谐振和电流谐振原理的分析,建立了相应的等值分析模型,指出了谐振接地方式能有效熄灭电弧的原理、消弧线圈调谐的原则,并提出了基于可实时调节消弧线圈的谐振接地电网单相接地故障选线新方法,为提高谐振接地电网的单相接地故障保护性能提供了研究基础.

Equivalent Analysis of Resonant Earthed System

In our country,the resonant earthed mode is now extensively applied in the MV system. The expanding of instantaneous ground arc fault is effectively controlled. By analyzing the voltage ,current ,voltage resonance and current resonance principle in the resonant earthed system ,this paper presents the equivalent analysis models of the resonant earthed system. And then this paper points out the extinguishing principle of grounding-arc and resonance adjustment principle of Peterson coil. A new method of fault line selection based on the real-time adjusting Peterson coil is also presented in this paper. It provides a research basis for the improving of protecting ability of single-phase-to-ground fault in the resonant earthed system.