提高小电流接地选线仪准确动作率的方法

Method of Enhancing Accurate Rate of Action for Trickle Grounding Wiring Selection Device

中性点经消弧线圈接地的小电流接地系统接地时,残余电流较小,受大地杂散电流的影响较大,为了选线装置的可靠运行,在保证TV、TA极性接线准确的前提下,还要注意接地网的运行情况,必要时改进选线仪的接线方式或改进零序TA二次线圈非极性端的接地位置等方法,都能有效地提高选线仪正确动作率.

When trickle grounding system of neutral point via extinction coil grounding is carded out, the residual current is relatively small, being greatly influenced by eddy current of the ground. To ensure a reliable running of wiring-selection unit, care must be also taken to conduct running of grounding net with the premise of guaranteeing accurate connection of TV and TA polarity. If necessary, either way of improving connection of wire-selection device or way of improving zero-sequence TA secondary coil non-polarity grounding position can be used effectively to enhance accurate rate of action for wiring selection device.