10kV系统小电流接地选线装置的实用化探讨

目前,在国内多数地区采用小电流接地选线装置。这种装置适用于3~66 kV中性点不接地或中性点经电阻、消弧线圈接地装置的单相接地选线。小电流接地选线装置,能够快速、准确的判断出单相接地故障。并且其接地电流小,如若出现事故,能够防止事故扩大的趋势。但小电流接地选线装置选线的准确率偏低,系统运行方式多变,容易引起因接地电流小而带来的误判。

Practical Discussion on Selection Device of Low-current Earthing System in 10 kV Power System

Selection device of low-current earthing system was used in most region at present. This device adapted to monophase earthing selection which included nutral point nonearthing device and nutral point with resistance and Petersen coil earthing device. Selection device of low-current earthing system could decide sigle phase earthing fault fastly and accurately and application for low earthing current could prevent the existed fault continuity. Selection device of low-current earthing system tended to occur false because of variable operation.