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Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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燃氣發電機轉子接地故障報警的檢測與處理

來源:電工電氣發布時間:2025-03-03 13:03 瀏覽次數:50

燃氣發電機轉子接地故障報警的檢測與處理

宋子祺1,2,王軼琛3,李智穎1,2,王新1,2,張迪1,2,詹鴻宇1,2
(1 浙江浙能技術研究院有限公司,浙江 杭州 311121;
2 浙江省火力發電高效節能與污染物控制技術研究重點實驗室,浙江 杭州 311121;
3 杭州華電下沙熱電有限公司,浙江 杭州 310018)
 
    摘 要:發電機轉子若發生兩點(多點)接地故障,其磁路平衡將遭受嚴重破壞,可能產生強烈振動,機組軸系嚴重磁化,致使無法正常運行,甚至燒損轉子繞組、鐵心或大護環。通過一起發電機轉子接地故障報警案例,介紹了現場查找轉子接地點相關檢測方法,并對造成的接地原因進行了分析。分析結果為該臺發電機制造工藝把控不嚴格,導致加工殘留物引發轉子接地;對發電機轉子所有通風副槽進行內窺鏡仔細查,并清除了其他加工殘留物,有效消除了轉子繞組接地隱患。
    關鍵詞: 發電機轉子;接地故障;對地電壓;電壓分布;轉子繞組
    中圖分類號:TM303.3      文獻標識碼:B     文章編號: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
 
參考文獻
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[3] 俞衛新,王曉劍,何天磊,胡磊,徐俊元,陳聰,梁辰. 重復脈沖法在發電機轉子一點接地故障診斷中的研究與應用[J]. 大電機技術,2021(6) :26-31.
[4] 王忠明.390H 型發電機轉子退磁方法探討[J]. 華電技術,2017,39(3) :21-24.
[5] 王忠明,郭衛軍,章震國.390H 型發電機一次轉子接地故障的分析和處理[J] . 華電技術,2012,34(12) :46-48.
[6] 江建明,宋功益,李硯海.600 MW 輪發電機轉子繞組接地故障及匝間短路分析與診斷[J] . 大電機技術,2015(1) :30-34.
[7] 沈曉暉,尹航,孫浩. 發電機轉子接地報警原因分析及智能接地保護探討[J] . 智能建筑電氣技術,2023,17(4) :43-47.
[8] 許震,饒春林.1 000 MW 機組發電機轉子一點接地跳機原因分析[J]. 電世界,2022,63(6) :6-8.

 

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