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Wan Shuting
College of Mechanical Engineering,
North China Electric Power University,
Baoding 071003, China
Li Heming
Li Yonggang
College of Electrical Engineering,
North China Electric Power University,
Baoding 071003, China
Tang Guiji
College of Mechanical Engineering,
North China Electric Power University,
Baoding 071003, China |
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GENERATOR
VIBRATION FAULT
DIAGNOSIS METHOD BASED ON
ROTOR VIBRATION AND STATOR
WINDING PARALLEL BRANCHES
CIRCULATING CURRENT
CHARACTERISTICS*
Abstract:
Rotor vibration characteristics are first analyzed, which are that the rotor vibration of fundamental frequency will increase due to rotor winding inter-turn short circuit fault, air-gap dynamic eccentricity fault, or imbalance fault, and the vibration of the second frequency will increase when the air-gap static eccentricity fault occurs. Next, the characteristics of the stator winding parallel branches circulating current are analyzed, which are that the second harmonics circulating current will increase when the rotor winding inter-turn short circuit fault occurs, and the fundamental circulating current will increase when the air-gap eccentricity fault occurs, neither being strongly affected by the imbalance fault. Considering the differences of the rotor vibration and circulating current characteristics caused by different rotor faults, a method of generator vibration fault diagnosis, based on rotor vibration
and circulating current characteristics, is developed. Finally,
the rotor vibration and circulating current of a type SDF-9
generator is measured in the laboratory to verify the
theoretical analysis presented above
Key words:
Generator Fault diagnosis Rotor vibration characteristic Stator winding parallel branches circulating current
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