一起因轉(zhuǎn)子繞組形變導(dǎo)致發(fā)電機(jī)振動(dòng)大的案例分析
楊玉磊
（中國大唐集團(tuán)科學(xué)技術(shù)研究院有限公司華東電力試驗(yàn)研究院，安徽 合肥 230088）
摘 要：隨著大容量高參數(shù)發(fā)電機(jī)的普遍應(yīng)用，發(fā)電機(jī)兩端振動(dòng)隨負(fù)荷變化異常增大的案例也越來越多。介紹了一臺1 000 MW汽輪發(fā)電機(jī)自投運(yùn)2 年后10 瓦振動(dòng)在高負(fù)荷階段異常持續(xù)增大的分析和處理過程。給出了振動(dòng)異常特征，通過轉(zhuǎn)子返廠解體檢修，最終確認(rèn)護(hù)環(huán)下外層全尺寸絕緣瓦堆起引起轉(zhuǎn)子端部繞組形變和通風(fēng)孔部分堵塞是引起發(fā)電機(jī)振動(dòng)異常變化的直接原因，并給出了解決措施，以防同類型故障再次發(fā)生。
關(guān)鍵詞：發(fā)電機(jī)；轉(zhuǎn)子繞組；振動(dòng)大；熱不平衡；繞組形變
中圖分類號：TM311 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2021)03-0058-04
A Case Study of Generator Vibration Increases Caused by Rotor Winding Deformation
YANG Yu-lei
（China Datang Corporation Science and Technology Research Institute Co., Ltd East China Electric
Power Test & Research Institute, Hefei 230088, China）
Abstract: With the widespread application of large-capacity and high-parameter generators in the field of coal-fired power generation, there are more and more cases in which the vibration at both ends of the generator increases abnormally with load changes. This paper introduces in detail the analysis and treatment process of the abnormal continuous increase of the 10-watt vibration of a 1 000 MW turbo-generator after it has been put into operation for two years. After the rotor returned to the factory for disassembly and overhaul, it was finally confirmed that the stacking of the full-size insulating tiles under the guard ring caused partial blockage of the winding deformation of the rotor end and the ventilation holes were the direct causes of abnormal vibration of the generator, and provided solutions to prevent the same type of failure happening again.
Key words: generator; rotor winding; vibration increases; thermal unbalance; winding deformation
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