10kV零序TA二次验收常见问题分析

Analysis of Secondary Circuit Acceptance of 10kV Zero-Sequence TA

为防止零序回路验收存在问题导致保护不能正确动作,根据10 kV系统中性点接地方式的不同,讨论了中性点不接地及中性点经小电阻接地时,零序TA回路验收常见的问题,并针对电缆金属护层接地线、零序TA极性以及开关柜接入多回电缆等常见问题进行分析,阐述了其对保护动作正确性的影响。

In order to prevent the false action of the protection caused by problems in the acceptance of the zero-sequence circuit,according to the different neutral point grounding modes of 10 kV system,it mainly discussed some common problems of neutral point ungrounded system and low resistance grounding system.It analyzes ground wire of cable metal sheath,the polarity of zero-sequence TA and cables access to one switch cabinet.It explained how these problems affect protection action.