配电网中性点经消弧线圈加并联选线电阻接地方式的运行安全可靠性探讨

Study on security and reliability of distribution network neutral grounding mode through arc suppression coil and line-selecting resistance in parallel

分析了中性点不接地方式、中性点经消弧线圈接地方式、中性点经小电阻接地方式和中性点经消弧线圈加并联选线电阻接地方式的特点、适用范围和对配电网系统运行可靠性的影响。结果表明,中性点经消弧线圈加并联选线电阻接地方式适用范围最广,故障选线性能优越,且成本增加不多,可以进一步提高配电网运行的安全性和可靠性,具有良好的应用前景。

There are mainly four kinds of neutral grounding modes for distribution network： neutral non-grounding mode,neutral grounding mode through arc suppression coil,neutral grounding mode through small resistance,and neutral grounding mode through arc suppression coil and line-selecting resistance in parallel.The features,the scope of application,the security and reliability of power supply of these four neutral grounding modes were analyzed.The results show that neutral grounding mode through arc suppression coil and line-selecting resistance in parallel has the widest scope of applications and great fault line selecting performance.Besides the increased costs is not large,and the security and reliability of distribution network operation can be further improved.This neutral grounding mode has a good prospect.