华电技术 ›› 2013, Vol. 35 ›› Issue (8): 41-42.

• 技术交流 • 上一篇    下一篇

转子一点接地故障原因分析及处理措施

  

  1. (国投钦州发电有限公司,广西钦州〓535008)
  • 出版日期:2013-08-25 发布日期:2013-09-23

Analysis on reasons of rotor singlepoint grounding fault and treatment measures

  1. (SDIC Qinzhou Power Generation Company Limited, Qinzhou 535008, China)
  • Online:2013-08-25 Published:2013-09-23

摘要: 摘要:某电厂 #4机组发电机转子接地保护采用乒乓切换式保护原理,对该机组出现的转子一点接地故障进行分析,得出故障原因为盲目更改保护出口方式。最后指出:对于采用乒乓切换式转子接地保护原理的装置,运行中应防止多套装置同时投入转子电压回路开关,避免装置互相干扰而引发保护误动。

关键词: 关键词:发电机, 励磁绕组, 转子接地保护, 继电保护, 乒乓切换式保护原理

Abstract: Abstract:The generator rotor grounding protection of unit No.4 in a power plant is based on the principle of PingPang type switchover protection. The rotor singlepoint grounding fault of the unit was analyzed, and it was determined that the reason of the fault is to change the protection output mode blindly. It was pointed out finally that for the devices based on the principle of PingPang type switchover protection, it is necessary to avoid turn on the switches of the rotor voltage circuit in multiple devices simultaneously; else the mutual interference may occur between the devices and cause the incorrect trip of the protection.

Key words: Key words:generator, excitation winding, rotor grounding protection, relay protection, principle of PingPang type switchover protection