密封油內(nèi)滲導(dǎo)致的轉(zhuǎn)子匝間絕緣劣化診斷
馮宇哲1,潘建偉2,王新3,楊立川1
(1 國網(wǎng)浙江省電力有限公司電力科學(xué)研究院,浙江 杭州 310014;
2 浙江浙能臺州第二發(fā)電有限責(zé)任公司,浙江 臺州 318016;
3 浙江浙能技術(shù)研究院有限公司,浙江 杭州 311121)
摘 要:密封油內(nèi)滲導(dǎo)致轉(zhuǎn)子匝間絕緣劣化,是轉(zhuǎn)子匝間短路故障的主要原因之一。某臺 1 050 MW 汽輪發(fā)電機(jī)在運(yùn)行狀態(tài)和極間電壓試驗(yàn)均無異常的情況下,通過分析重復(fù)脈沖試驗(yàn)結(jié)果,判斷轉(zhuǎn)子繞組已存在由密封油內(nèi)滲導(dǎo)致的轉(zhuǎn)子匝間絕緣劣化問題;拔出轉(zhuǎn)子護(hù)環(huán),發(fā)現(xiàn)轉(zhuǎn)子端部繞組區(qū)域存在大量密封油內(nèi)滲現(xiàn)象,同時轉(zhuǎn)子匝間絕緣未發(fā)生金屬性短路;對匝間絕緣劣化的機(jī)理進(jìn)行了闡述并給出了檢修策略,以避免類似問題的再次發(fā)生。
關(guān)鍵詞: 發(fā)電機(jī);轉(zhuǎn)子繞組;密封油內(nèi)滲;匝間絕緣劣化
中圖分類號:TM311 文獻(xiàn)標(biāo)識碼:B 文章編號:1007-3175(2024)01-0055-04
Diagnosis of Rotor Interturn Insulation Deterioration
Caused by Seal Oil Infiltration
FENG Yu -zhe1, PAN Jian-wei2, WANG Xin3, YANG Li-chuan1
(1 State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute, Hangzhou 310014, China;
2 Zhejiang Zheneng Taizhou Second Electric Power Generation Co., Ltd, Taizhou 318016, China;
3 Zhejiang Zheneng Technology Research Institute Co., Ltd, Hangzhou 311121, China)
Abstract: The sealing oil internal leakage leads to the degradation of generator rotor inter-turn insulation, which is one of the main reasons for rotor inter-turn short circuit faults. In this paper, a 1 050 MW steam turbine generator is taken as an example, and there is no abnormality in its operating state and interpolar voltage test, it was judged that the rotor winding had multi-point inter-turn insulation deterioration caused by sealing oil infiltration by analyzing the results of repeated pulse tests. When the rotor retainer ring was pulled out, it found that there was a large amount of sealing oil infiltration in the winding area at the end of the rotor, and there was no metallic short circuit in the insulation between the rotor turns; the mechanism of inter turn insulation degradation was explained and maintenance strategies were provided to avoid similar problems from happening again.
Key words: generator; rotor winding; seal oil infiltration; interturn insulation deterioration
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