摘要
变压器绕组的顶层油温作为一种重要的健康监测指标,能够有效表征其内部状态和潜在缺陷。基于超声传感技术在穿透性强和对温度变化灵敏方面的优势,提出了一种融合超声传感技术和鲸鱼算法优化支持向量机(whale optimization algorithm-optimized support vector machine,WOA-SVM)的新型反演方法。以35 kV变压器作为研究对象,通过进行短路实验实现变压器内部升温,同时采集携带丰富温度信息的超声波信号。深入探讨了20℃~50℃,不同温度条件下变压器内部的超声波信号变化特性,通过提取和处理声波信号的关键特征参数,如波峰幅值、峰峰值、均方根、波形因子、裕度因子、方差等,成功实现了对顶层油温的精准反演。研究结果表明,该方法在变压器顶层油温的反演中表现出较高的准确率(97.95%),为变压器健康监测提供了一种新的技术路径。
The top-oil temperature of transformer windings serves as a crucial health monitoring indicator,effectively characterizing the internal state and potential defects.Leveraging the advantages of ultrasonic sensing technology,known for its strong penetrative power and sensitivity to temperature changes,a novel inversion method combining ultrasonic sensing technology with whale optimization algorithm-optimized support vector machine(WOA-SVM)is proposed.This study focuses on a 35 kV transformer,where internal temperature rise is induced through short-circuit testing,and ultrasonic signals carrying temperature information are collected.An in-depth exploration is conducted on the characteristics of ultrasonic wave signals inside the transformer under different temperature conditions ranging from 20℃to 50℃.By extracting and processing key acoustic signal parameters,such as peak amplitude,peak-to-peak value,root mean square,waveform factor,crest factor,and variance,accurate inversion of the top-oil temperature was successfully achieved.The research results demonstrate that this method exhibits high accuracy(97.95%)in the inversion of transformer top-oil temperature,providing a new technical avenue for transformer health monitoring.
作者
杨超
薛帅
李承振
郭昊鑫
杨梦娇
YANG Chao;XUE Shuai;LI Chengzhen;GUO Haoxin;YANG Mengjiao(State Grid Shandong Electric Extrahigh Voltage Company,Jinan 250021,China;Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment,School of Electrical Engineering,Shandong University,Jinan 250061,China)
出处
《山东电力技术》
2025年第7期76-85,共10页
Shandong Electric Power
基金
国网山东省电力公司科技项目(2022A-125)。
关键词
油浸式电力变压器
顶层油温
超声检测
支持向量机
oil-immersed power transformer
top-oil temperature
ultrasonic testing
support vector machine
