真空灭弧有载分接开关振动特性分析  

Vibration Characteristic Analysis of Vacuum Interrupter On-load Tap-changer

作　　者：樊家昊 汪卫国 王丰华[4] 钱勇[4] FAN Jiahao;WANG Weiguo;WANG Fenghua;QIAN Yong(College of Electrical Engineering,Shanghai University of Electric Power,Yangpu District,Shanghai 200090,China;State Grid Fcngxian Power Supply Branch,Shanghai Municipal Electric Power Company,Fcngxian District,Shanghai 201400,China;State Grid Jinhua Power Supply Company,Jinhua 321017,Zhejiang Province,China;Department of Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China)

机构地区：[1]上海电力大学电气工程学院,上海市杨浦区200090 [2]国网上海市电力公司奉贤供电分公司,上海市奉贤区201400 [3]国网浙江省电力公司金华供电公司,浙江省金华市321017 [4]上海交通大学电气工程系,上海市闵行区200240

出　　处：《电网技术》2019年第12期4425-4432,共8页Power System Technology

基　　金：国家重点研发计划项目(2017YFB0902700);国网浙江省电力公司科技项目(52111DS160022)~~

摘　　要：为准确掌握真空灭弧式有载分接开关(on-loadtap changer,OLTC)的振动特性,综合自适应形态学组合滤波和小波变换对真空灭弧式OLTC换档过程中的振动信号时域波形的统计特征进行了分析。首先根据OLTC振动信号自适应地求取了形态学组合滤波器的结构元素,然后应用Morlet小波求取OLTC振动信号的时域包络,据此结合真空灭弧式OLTC切换开关的结构定义了表征振动信号脉冲间能量变化的波形特征统计指标及运行状态系数。对现场某换流变真空灭弧式OLTC的振动信号分析表明:所设计的自适应形态滤波器能有效滤除OLTC振动信号中的干扰成分,振动信号波形特征指标的分布特性能够较为准确地反映OLTC的运行状况。研究结果可为基于振动分析法的真空OLTC机械状态监测技术提供重要依据。To accurately understand the vibration characteristics of vacuum on-load tap changer(OLTC) during its switch-over process, and obtain feature of vibration signals, this paper proposes an adaptive morphological filtering algorithm combined with wavelet transform to analyze the statistical feature of vibration signals in process of vacuum OLTC shift. Firstly, the structure elements of the morphological combination filter are obtained according to OLTC vibration signals. Then Morlet wavelet is applied to calculate the envelope curve of the vibration signal. A waveform feature index and a running condition coefficient, describing the energy change between the pulses of the vibration signals, are defined by combining the structure of vacuum OLTC diverter switch. The calculation results of vibration signals of the vacuum interrupter OLTC in converter transformer show that the designed adaptive morphological filter can effectively filter out the interference of OLTC vibration signal, and the distribution characteristics of the defined vibration signal waveform characteristic index can accurately reflect OLTC operation status. The results could provide important basis for mechanical condition monitoring technology of vacuum OLTC based on vibration analysis method.

关 键 词：真空OLTC 振动信号 小波变换 自适应形态学滤波 波形特征 

分 类 号：TM721[电气工程—电力系统及自动化]