小电流接地系统发接地信号时的故障类型判断

目前在小电流接地系统中，大多数变电站未装设选线装置，在发接地信号时需要进行人工判断。为此，对容易忽视的ＰＴ断线，以及比较陌生物线路断线也可能发接地信号的原理进行了分析，并对单相接地、铁磁谐振、ＰＴ断线、线路断线等几种故障的特征进行比较，简述故障类型的基本判别方法。

The Identification of Fault Type When Sending the Ground Signal in the Low Current Ground System

At present the ground line identification equipment for the low current ground system werenot installed in most of substations stations. When the ground signal occurred, it is needed for themanual identification. So the analysis has been carried out about the theory that when the PT wirebreak and line drop happened it could also trigger the sending of ground signal. The comparisons havebeen made about the fault characteristics,when the single phase grounding,core inductive resonance,PT wire break,and line drop occurred. The basic identification method of these faults has been introduced.