大型发电机组的轴电压与转子接地保护误动的探讨

Discussion on Large Unit Shaft Voltage and Rotor Grounding Protection Misoperation

根据转子接地保护的原理及轴电压的形成,阐述了转子1点接地保护误动与轴电压、大轴接地之间的关系。通过浙江兰溪发电厂4×600MW机组转子1点接地保护为例对转子接地误动进行分析,并建议将发电机大轴接地铜辫改为接地碳刷形式,保证大轴接地的可靠。

Based on prineiples of rotor grounding protection and formation of shaft voltage, this paper explains relationships between rotor point 1 grounding protection misoperation with shaft voltage and main shaft grounding. Using Lanxi Power Plant 4×600 MW unit rotor point 1 grounding protection as an example, this paper analyzes rotor grounding protection misoperation and suggests that carbon brush should replace copper braid in main shaft grounding to improve reliability.