基于端部漏磁特征频率的汽轮发电机转子匝间短路故障诊断实验研究

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Abstract In order to avoid serious failures and financial losses by inter-rotor windings inter-turn short-circuit fault in turbine generator,the paper studies a on-line detecting method for rotor windings inter-turn short circuit fault by generator end-leakage-flux. The teratogenic effects of stationary asymmetry problems on generator radial main field are analyzed,and some flux flows along the shaft,covers,bearings and other parts and a closed loop is formed. After inter-turn short circuit fault,new harmonic components appear in generator air gap magnetic potential,and characteristic components corresponding to the fault are produced in the end-leakage-flux. To confirm the conclusions,rotor windings inter-turn short circuit faults are simulated on the MJF-30-6 fault simulation generator,generator end-leakage-flux variations are analyzed under different short-circuit levels. The results show that: the more serious the short circuit is,the more obvious characteristics component total rms increases,which are consistent with the theoretical expectations. The conclusions provide a new solution for on-line detection of rotor windings inter-turn short circuit fault in turbinegenerator.

Key words： Stationary asymmetry rotor windings inter-turn short circuit end-leakage-flux diagnosis

Received: 22 April 2014 Published: 22 January 2015

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TM311

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