Impact of the Field Winding Interturn Short-Circuit Position on Rotor Vibration Properties in Synchronous Generators

Author:

Yuan Xing-Hua1ORCID,He Yu-Ling1ORCID,Liu Man-Yu2,Wang Hui3,Wan Shu-Ting1,Vakil Gaurang4

Affiliation:

1. Department of Mechanical Engineering, Hebei Provincial Key Lab of Electric Power Equipment Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China

2. State Grid Beijing Electric Power Research Institute, Beijing 100000, China

3. Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China

4. Department of Electrical and Electronics Engineering, University of Nottingham, NG7 2RD, Nottingham, UK

Abstract

This paper investigates the effect of the field winding interturn short-circuit (FWISC) position on the rotor vibration properties in turbo generators. Different from the previous studies which focused on the influence of the short-circuit degree, this work pays much attention to the impact of the short-circuit position on the rotor unbalanced magnetic pull (UMP) properties and vibration characteristics. The theoretical UMP model is firstly deduced based on the analysis of the magnetic flux density (MFD) variation. Then, the finite element analysis (FEA) is performed to calculate the UMP data. Finally, the rotor vibrations are tested on a CS-5 prototype generator which has two poles and a rated capacity of 5 kVA. It is shown that the occurrence of FWISC will greatly increase the UMP as well as the rotor vibration. In addition to the short-circuit degree, the short-circuit position will also affect the UMP and vibration. The nearer the short-circuit position is to the big rotor teeth, the larger the UMP and vibration will be. The proposed study in this paper will be beneficial for the monitoring and diagnosis of FWISC faults.

Funder

National Natural Science Foundation of China

Publisher

Hindawi Limited

Subject

General Engineering,General Mathematics

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