基于轴承座振动特性的大型同步调相机偏心故障程度诊断方法

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 77-83.

论文

李永刚1，贺鹏康1，马明晗1，岳文亭2

作者信息 +

Diagnosis method for the eccentricity fault degree of a large synchronous condenser based on vibration characteristics of the bearing seat

LI Yonggang1，HE Pengkang1，MA Minghan1，YUE Wenting2

Author information +

文章历史 +

摘要

本文提出了一种利用同步调相机偏心故障后的轴承座二倍频振动与振动幅度来判断气隙偏心故障程度的在线监测方案。首先推导了动、静偏心故障后轴承座的振动特性，得出动、静偏心均会使调相机产生二倍频振动的结论。其次，利用二倍频振动与振动幅度作为鉴别故障程度的特征量，推导得出了不同类型偏心故障程度计算公式。最后，采用Maxwell有限元软件搭建了某300Mvar大型同步调相机二维模型，仿真计算出不同程度偏心故障后轴承座所受到的不平衡电磁力，对所提偏心故障程度诊断方案进行仿真验证。结果表明，该方案能够准确计算出故障偏心程度，并且偏心故障程度越大，该方案的诊断误差越小。本方案的提出对大型同步调相机的偏心故障程度的在线监测诊断具有极大的参考价值。
关键词：同步调相机；气隙偏心；轴承座振动特性；有限元分析；故障程度诊断

Abstract

This paper proposes an online monitoring program to judge the degree of air gap eccentricity by using the double-frequency vibration and vibration amplitude of the bearing seat after the eccentricity of the synchronous condenser. Firstly, the vibration characteristics of the bearing seat after the dynamic and static eccentricity failure are deduced, and it is concluded that both the dynamic and static eccentricity will cause the double-frequency vibration of the synchronous condenser. Secondly, using the double frequency vibration and the vibration amplitude as the characteristic quantities to identify the degree of failure, the calculation formulas for the degree of different types of eccentric failure are derived. Finally, Maxwell finite element software was used to build a two-dimensional model of a 300Mvar large-scale synchronous condenser, and the imbalance electromagnetic force on the bearing seat after different degrees of eccentricity faults was calculated by simulation, and the proposed eccentricity fault diagnosis scheme was simulated and verified. The results show that the scheme can effectively calculate the degree of fault eccentricity, and the greater the degree of eccentricity, the smaller the diagnosis error of the scheme. The proposal of this scheme has great reference value for the online monitoring and diagnosis of the degree of eccentricity faults of large synchronous condenser.
Keywords: synchronous condenser; air gap eccentricity; Bearing seat vibration characteristics; finite element analysis; fault diagnosis

导出引用

李永刚1，贺鹏康1，马明晗1，岳文亭2. 基于轴承座振动特性的大型同步调相机偏心故障程度诊断方法[J]. 振动与冲击, 2022, 41(14): 77-83

LI Yonggang1，HE Pengkang1，MA Minghan1，YUE Wenting2. Diagnosis method for the eccentricity fault degree of a large synchronous condenser based on vibration characteristics of the bearing seat[J]. Journal of Vibration and Shock, 2022, 41(14): 77-83

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