doi:10.16186/j.cnki.1673-9787.2020100048

Received:2020/10/21

Revised:2020/12/29

Published:2021/11/15

Rotor eccentricity fault diagnosis method of large condenser based on harmonic and vibration characteristics

LIN Wande1,2,3, WANG Shengjie 1,2,3, BAO Zhenghong1,2,3, WANG Lili1,2,3, WANG Shengfu1,2,3, JIANG Ling1,2,3, LI Yonggang4, JIANG Meng4

1.Electric Power Research institute,State Grid Qinghai Electric Power Company,Xining  810000 ,Qinghai,China;2.Qinghai Key Laboratory of High Altitude Electric Power Research ,Xining  810000 ,Qinghai,China;3.Qinghai High Altitude Power Engineering Technology Research Center,Xining  810000 ,Qinghai,China;4.Department of Electrical Engineering,North China Electric Power University,Baoding  071000 ，Hebei,China

Abstract:Under the background of strong HVDC and weak AC power grid ,the dynamic reactive power sup-port capacity is becoming more and more important in converter station. With the advantage of reactive power compensation ,the condenser has become the focus of current research. The rotor eccentricity frequently occursin the field ,which has a major impact on the safe and stable operation of the condenser. In this paper ,the rotor eccentric fault was taken as the research object. 'The variation characteristics were derived about air gap flux density and stator vibration. It was found that the air gap flux density had even harmonics and the stator hadodd multiple frequency vibration after eccentricity. Based on magnetic density harmonic and stator vibration characteristics ,a dynamic eccentric fault diagnosis method was proposed. A fault feature extraction method u-sing detection coil was applied. ln order to verify the correctness of the diagnosis method ,the finite element model was established by ANSOFT software based on the structural parameters of a 300 Mvar large condenser. Compared with the single electrical or vibration characteristic as the diagnosis basis ,the proposed method had higher accuracy and simple operation. It was not affected by the operation status ，which could provide guarantee for the safe and stable operation of large condenser.

Key words:large condenser;rotor eccentricity;fault diagnosis;flux density harmonic;stator vibration;detection coil;finite element method

 基于谐波与振动特性的大型调相机转子偏心故障诊断方法_林万德.pdf