高压电器2018，Vol.54Issue(1)：123-130,8.DOI:10.13296/j.1001-1609.hva.2018.01.018
基于有限元分析的电力变压器绕组故障诊断
Winding Fault Diagnosis of Power Transformer Based on Finite Element Analysis
鲁非 1金雷 1刘思维 2刘毅 2李化 2林福昌2
作者信息
- 1. 国网湖北省电力公司电力科学研究院国家电网公司高压电气设备现场试验技术重点实验室,武汉430077
- 2. 华中科技大学强电磁工程与新技术国家重点实验室,武汉430074
- 折叠
摘要
Abstract
Winding fault diagnosis of power transformer is the key technology to ensure the safe operation of power transformer.Combining the finite element method and the high-frequency equivalent circuit,a transformer winding fault diagnosis method is proposed in this paper.It can effectively improve the reliability of fault diagnosis based on the ideas of building a relationship between structural faults,electrical parameters,and test results.Based on the finite element model built in Ansoft Maxwell,the main electrical parameters of the transformer,such as the grounding capacitances and the inter-disk capacitances,are calculated.The effect of transformer winding fault on the changes of the electrical parameters is explored in detail.A high-frequency equivalent circuit is built using the calculated parameters.In this paper,the axial displacement fault is taking as an example to obtain the curves of frequency response analysis (FRA) under different fault degrees.The results of simulation shows that the change of the FRA curves at the selected frequency band (200～250 kHz) are arranged along a curve which can be described by a cubic function and a parabolic function,respectively.It should be regarded as a diagnostic band to predict the tendency of FRA curves caused by axial displacement.Therefore,the proposed diagnosis method can guide the transformer winding fault diagnosis,and directly bridge the types and degrees of the faults with the test results.关键词
电力变压器/有限元/绕组故障/径向形变/轴线位移Key words
power transformer/finite element method/structural faults/radial deformation/axial displacement引用本文复制引用
鲁非,金雷,刘思维,刘毅,李化,林福昌..基于有限元分析的电力变压器绕组故障诊断[J].高压电器,2018,54(1):123-130,8.
