局部放电超高频脉冲分段采集及相角计算方法  

Segmental acquisition of partial discharge UHF pulses and its phase angle calculation

作　　者：胡岳[1] 司良奇[1] 张卫东[2] 钱勇[1] 盛戈皞[1] 江秀臣[1] 

机构地区：[1]上海交通大学电气工程系电力传输与功率变换控制教育部重点实验室,上海200240 [2]山东电力集团公司威海供电公司,山东威海264200

出　　处：《电力自动化设备》2013年第6期70-74,93,共6页Electric Power Automation Equipment

基　　金：上海市科学技术委员会资助项目(10dz1203000)~~

摘　　要：采用连续采样方法检测局部放电信号成本较高,为此提出一种分段采集模式。采用高、低速系统分别采集局部放电超高频脉冲及工频信号,利用局部放电脉冲同步触发工频信号。采用模糊聚类方法计算所采集工频信号的实时基波频率,进而基于傅里叶级数算法,计算所采集工频信号的初始相位角,并以此作为局部放电脉冲的相角。通过局部放电脉冲相角、局部放电脉冲时间间隔及工频信号频率计算整个局部放电脉冲链相角。仿真试验和现场检测验证了所提方法的有效性和实用性。As the cost of partial discharge detection by continuous sampling is high,a method by segmental acquisition is proposed,which uses the partial discharge pulse to simultaneously trigger the power frequency signal while applies both high-and low-speed systems to acquire the UHF（Ultra High Frequency） pulse signal of partial discharge and the power frequency signal respectively.The fuzzy clustering method is applied to calculate the real-time fundamental power frequency and the Fourier series algorithm is applied to calculate the initial phase angle of power frequency signal,which is taken as the phase angle of partial discharge pulse.The phase angle of the whole partial discharge chain is then calculated with the phase angle and time interval of partial discharge pulse and the fundamental power frequency.Results of simulation and field test show the effectiveness and practicability of the proposed method.

关 键 词：绝缘 局部放电 超高频 信号检测 傅里叶级数 模糊聚类 触发电路 仿真 聚类算法 采样 

分 类 号：TM83[电气工程—高电压与绝缘技术]