宁夏电力
寧夏電力
저하전력
NINGXIA ELECTRIC POWER
2012年
1期
27-30
,共4页
不接地系统%单相接地故障%零序电流%零序电压
不接地繫統%單相接地故障%零序電流%零序電壓
불접지계통%단상접지고장%령서전류%령서전압
unearthed system%single-phase earth fault%zero sequence current%zero sequence voltage
针对110 kV变压器中性点不接地系统中,由于线路区外发生单相接地故障导致零序Ⅰ段方向过流保护误动问题,对零序电压及零序电流的产生原因进行分析,找出误动原因及对策。分析结果表明：系统母线零序电压过大造成变压器中性点间隙击穿放电是导致零序方向过流Ⅰ段保护误动的主要原因。
針對110 kV變壓器中性點不接地繫統中,由于線路區外髮生單相接地故障導緻零序Ⅰ段方嚮過流保護誤動問題,對零序電壓及零序電流的產生原因進行分析,找齣誤動原因及對策。分析結果錶明：繫統母線零序電壓過大造成變壓器中性點間隙擊穿放電是導緻零序方嚮過流Ⅰ段保護誤動的主要原因。
침대110 kV변압기중성점불접지계통중,유우선로구외발생단상접지고장도치령서Ⅰ단방향과류보호오동문제,대령서전압급령서전류적산생원인진행분석,조출오동원인급대책。분석결과표명：계통모선령서전압과대조성변압기중성점간극격천방전시도치령서방향과류Ⅰ단보호오동적주요원인。
Aiming at the problem of the single phase earth fault happened outside the work area leading to the zero sequence I section direction overcurrent protection device misoperation in neutral point unearthed system of 110 kV transformer,analyzes the occurred reasons of the zero sequence voltage and current,finds out causes of the misoperation and countermeasures.the result of analysis shows that the the high zero sequence voltage of the system bus caused the transformer neutral point gap breakdown and discharge is the main reason of zero sequence I section direction overcurrent protection device misoperation the high zero sequence voltage of the system bus caused the transformer neutral point gap breakdown and discharge.
