高电压技术2024，Vol.50Issue(5)：2146-2157,中插38,13.DOI:10.13336/j.1003-6520.hve.20230872
基于弹性力学-热力学的变压器铁芯磁致伸缩振动模型与松动故障诊断方法
Magnetostrictive Vibration Model and Loosening Fault Diagnosis Method of Transformer Core Based on Elastodynamics-thermodynamics
摘要
Abstract
In order to accurately analyze the magnetostriction phenomenon of transformer cores,a theoretical model of core vibration coupled with elastodynamics and thermodynamics is established,and a method for diagnosing loosening based on singularity decomposition is proposed.Firstly,by coupling the strain energy in elastodynamics and the elastic free energy in thermodynamics,a mathematical model for magnetostrictive vibrations characterising the multi-band core of a transformer is developed.Secondly,the effect of a non-linear force-magnetic coupling mechanism based on elastic dynamics is taken into consideration,a vibration multi-band multi-physical field simulation model is established,and multi-band vibration characteristics of the core from 0 Hz to 1000 Hz are obtained.Thirdly,a magnetostrictive vibration acquisition platform for transformer cores is built and vibration monitoring tests are carried out on 10 kV transformer cores.The experimental findings show that,besides the primary frequency of 100 Hz,the core vibration also contains vi-bration signals from 200 Hz to 600 Hz,with the measured results of 0.009 m/s2 and 0.023 m/s2 for the A and B phases,and the simulation results of 0.009 m/s2 and 0.023 m/s2.The simulations agree with the experimental results and demon-strate the correctness of the simulation model.Afterwards,a core loosening fault model is developed to obtain the vibration characteristics in the partially and fully loosened state.Finally,the vibration signals are used to diagnose faults based on different states of the iron core,such as in normal,partially loose,and completely loose states.A method which is based on the singular decomposition theory is proposed,and characteristic values of 0.0524,0.2822,and 1.5059,re-spectively can be obtained.It is confirmed that,as the looseness worsens,the characteristic values increase,validating the feasibility of the diagnostic approach.关键词
变压器/铁芯/磁致伸缩/振动信号/松动诊断Key words
transformers/cores/magnetostriction/vibration signals/loose diagnostics引用本文复制引用
曹辰,路敦林,徐博文,李晓龙,何龙,朱咏明..基于弹性力学-热力学的变压器铁芯磁致伸缩振动模型与松动故障诊断方法[J].高电压技术,2024,50(5):2146-2157,中插38,13.基金项目
国家自然科学基金(52107157) （52107157）
国网新疆电力有限公司科技项目(5230CJ230002) （5230CJ230002）
辽宁省教育厅科技项目(JYTMS20231208).Project supported by National Natural Science Foundation of China(52107157),Science and Technology Project of State Grid Xinjiang Electric Power Co.,Ltd.(5230CJ230002),Science Research Project of the Educational Department of Liaoning Province(JYTMS20231208). （JYTMS20231208）
