浅析不同接线方式下小电阻保护的特点

Brief Analysis of the Features of Small Resistance Protection under Various Connection Modes

在35 kV系统经小电阻接地发生单相接地故障时,故障元件都会经零序电流或零序电压保护跳闸,切除故障,避免了因单相接地时完好相电压升高给设备绝缘带来严重危害性,从而保护了设备,同时也降低了输电设备的生产成本。文章阐述了小电阻保护的构成和其基本原理,以及在不同的35 kV接线方式下所配置的35kV系统接地保护的特点。

When the 35 kV system is grounded through a small resistance, in the event of earthing on a single-phase, the failed component may be shut off by tripping operation by means of the protection zero-sequence current or zero sequence voltage, so that the failure is cut off the circuit. Thus, it avoids the severe damage to the insulation of the equipment resulting from the heightened phase voltage of the unaffected phases following the earthing on single phase Thereby, the equipment is protected, and meanwhile the production costs for the power transmission facility is reduced. This essay mainly expounds the fundamental principle of constitution of a small resistance protection, and the features of grounding protection for 35 kV systems which are configured under various 35 kV connection modes.