不同生长阶段下电树枝放电的时频特征分析  

Analysis on Time-frequency Characteristics of Electrical Tree Discharge in Different Growth Stages

作　　者：陈仕军 叶笛[2] 刘华麟 杨通江 

机构地区：[1]贵州电力试验研究院,贵阳550002 [2]重庆市电力公司南坪供电局,重庆401147

出　　处：《高压电器》2013年第3期49-52,58,共5页High Voltage Apparatus

摘　　要：采用针缺陷短电缆试验平台，研究电缆电树枝不同生长阶段的时频放电特征，研究发现，在电树枝发展的早期，电树枝放电的频率主要集中在5～7．5MHz之间，随着电树枝的不断发展，在7．5~10MHz频段内的局部放电信号逐渐增加。在电树枝生长的末期，位于7．5～10MHz频段内的放电量幅值达到最大，约是5～7．5MHz频段放电的5倍。分析认为在电树枝生长的末期，放电通道越接近电缆线芯，其放电信号的频率越高，放电量越大。Time-frequency characteristics of electric tree discharge during different growth stages were analyzed on an experiment platform of cable with needle-defects. The results show that： in early growth stage of electrical tree, the frequency of discharge signal is within 5~7.5 MHz, and the partial discharge signal intensifies gradually in the 7.5~10 MHz band with the growth of the electrical tree; at latter end of the electrical tree maximum, about 5 the cable core, the growth, times higher the amplitude of the discharge capacity in the band of 7.5-10 MHz gets the of that in the lower frequency band, and the closer the discharge channel from the discharge siznal freauencv of the electrical tree.

关 键 词：电树枝 电缆 放电图谱 局部放电 

分 类 号：TM75[电气工程—电力系统及自动化]