Review and prospect of online rotor inter-turn short circuit monitoring for synchronous generator
Hao Lianglian · Dianli zidonghua shebei · 2013
The principles of five online rotor inter-turn short circuit monitoring methods are introduced and evaluated:fault monitoring based on magnetic field measurement,shock pulse,shaft voltage monitoring,electrical parameter monitoring and unit vibration monitoring. The research progress of electrical parameter monitoring method is introduced in three aspects:the fault mathematical modeling,the fault characteristic and mechanism and the fault monitoring based on the internal unbalanced current of stator phase windings. The researches of online rotor inter-turn short circuit monitoring techniques are prospected from three aspects:the sensitive monitoring without dead-zone,the fault monitoring of generator unequipped with branch current transformer and the online fault location,and some preliminary concepts are given.