燃气发电机转子接地故障报警的检测与处理
宋子祺1，2，王轶琛3，李智颖1，2，王新1，2，张迪1，2，詹鸿宇1，2
(1 浙江浙能技术研究院有限公司，浙江 杭州 311121；
2 浙江省火力发电高效节能与污染物控制技术研究重点实验室，浙江 杭州 311121；
3 杭州华电下沙热电有限公司，浙江 杭州 310018)
摘 要：发电机转子若发生两点(多点)接地故障，其磁路平衡将遭受严重破坏，可能产生强烈振动，机组轴系严重磁化，致使无法正常运行，甚至烧损转子绕组、铁心或大护环。通过一起发电机转子接地故障报警案例，介绍了现场查找转子接地点相关检测方法，并对造成的接地原因进行了分析。分析结果为该台发电机制造工艺把控不严格，导致加工残留物引发转子接地；对发电机转子所有通风副槽进行内窥镜仔细查，并清除了其他加工残留物，有效消除了转子绕组接地隐患。
关键词： 发电机转子；接地故障；对地电压；电压分布；转子绕组
中图分类号：TM303.3 文献标识码：B 文章编号：1007-3175(2025)02-0046-04
Detection and Handling of Ground Fault Alarm in Gas Generator Rotor
SONG Zi-qi1,2, WANG Yi-chen3, LI Zhi-ying1,2, WANG Xin1,2, ZHANG Di1,2, ZHAN Hong-yu1,2
（1 Zhejiang Energy Research Institute Co., Ltd, Hangzhou 311121, China;
2 Zhejiang Provincial Key Laboratory of Energy Conservation & Pollutant Control Technology for Thermal Power, Hangzhou 311121, China;
3 Hangzhou Huadian Xiasha Cogeneration Co., Ltd, Hangzhou 310018, China）
Abstract: In the event of a two-point (or multi-point) grounding fault in a generator rotor, the magnetic circuit balance of the generator will be seriously disrupted, and the generator may produce strong vibrations and serious magnetization of the unit shafting, resulting in the failure of the generator to operate normally, and even burn the rotor winding, core or large protective ring of the generator. In this paper, through a generator rotor grounding fault alarm case, the relevant detection methods for finding the rotor grounding point on site are introduced, and the grounding causes are analyzed. The analysis results showed that the manufacturing process of the generator was not strictly controlled, which led to the grounding of the rotor caused by the processing residue. The endoscopic inspection of all ventilation sub-slots of the generator rotor was carried out, and other processing residues were removed, which effectively eliminated the hidden danger of the grounding of the rotor winding.
Key words: generator rotor; grounding fault; ground voltage; voltage distribution; rotor winding
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