Analysis of vibration evolution and propagation characteristics due to mechanical degradation in transformer iron cores

IF 4.4 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
High Voltage Pub Date : 2025-05-15 DOI:10.1049/hve2.70035
Yunpeng Liu, Guanyu Chen, Fuseng Xu, Tao Zhao, Hongliang Liu, Lu Sun
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引用次数: 0

Abstract

This study investigates vibration changes due to transformer core deterioration by monitoring core vibration, compression force and shell wall vibrations simultaneously. The transformer core operates in a compound environment of mechanical vibration and thermal ageing for extended periods, and the correlation mechanism between core structural deterioration and shell vibration changes remains unclear. This study first derives and analyses the propagation mechanism of core vibration in oil. The experiments simulate the internal deterioration of a 10 kV transformer using pressure sensors to monitor the compression force on the core and windings and vibration sensors on the internal upper yoke and the enclosure to capture full vibration measurements. Analysis of the vibration data during the experiment, using two quantitative indicators—vibrational entropy and fundamental frequency weight—reveals that measurement point #2 (on the outer case wall corresponding to the internal upper yoke) shows a value approximately 1.2 times that of the internal upper yoke. However, measurement point #5 (located away from the upper yoke near the windings) demonstrates a value about 2.3 times that of the internal upper yoke. The results indicate that measurement point #2 has high vibration consistency with the internal upper yoke, whereas it exhibits significant variability compared to measurement point #5. To validate these findings, researchers collected 24-h vibration data from 105 in-service 220 kV transformers and the results aligned with those from the experimental platform. This study quantitatively addresses the changes in case vibration characteristics caused by core degradation and proposes a novel method for detecting the mechanical state of transformer cores through vibration analysis.
变压器铁芯机械退化引起的振动演化与传播特性分析
通过同时监测铁芯振动、压缩力和壳壁振动,研究变压器铁芯劣化引起的振动变化。变压器铁心长期处于机械振动和热老化的复合环境中运行,铁心结构劣化与壳体振动变化的相关机制尚不清楚。本文首先推导并分析了岩心振动在石油中的传播机理。利用压力传感器监测铁芯和绕组的压缩力,利用振动传感器监测上轭和外壳内部的振动,模拟了10kv变压器的内部劣化过程。利用振动熵和基频权重这两个定量指标对实验过程中的振动数据进行分析,发现测量点#2(与内部上轭相对应的外壳外壁)的值约为内部上轭的1.2倍。然而,测量点#5(远离上轭,靠近绕组)显示的值约为内部上轭的2.3倍。结果表明,测量点#2与内部上轭具有较高的振动一致性,而与测量点#5相比,它表现出显著的变异性。为了验证这些发现,研究人员收集了105台220千伏变压器24小时的振动数据,结果与实验平台的结果一致。本研究定量地解决了铁芯退化引起的机壳振动特性变化,提出了一种通过振动分析检测变压器铁芯机械状态的新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
High Voltage
High Voltage Energy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍: High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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