关键词: 发电机；气隙偏心故障；多重特征；振动；定子绕组并联支路环流

Abstract:

The generator stator winding parallel branches circulating current characteristics on air-gap eccentric fault were analyzed. Firstly, the expressions of electromotive force difference between stator winding parallel branches were gotten on generator normal operation conditions. Then through analyzing the parameter changing on air-gap eccentric fault, the circulating current characteristics were gained based on the expressions, which were that fundamental circulating current will increase on air-gap eccentric fault, and the compositive characteristics of vibration and current of air-gap eccentric fault were gained. Finally, the data of a type SDF-9 generator on the fault was measured in laboratory to verify the theoretical analysis presented above. On the other hand the relationship between mechanical fault such as air-gap eccentric fault and electric characteristic was found out, and electric signals can be as the symptom of mechanical faults，and the new idea and method for study the mechanical fault was provided.

Key words: generator, air-gap eccentric fault, compositive characteristics, vibration, stator winding parallel branches circulating current