10kV交联聚乙烯电缆本体交流电压下空间电荷测量  

Space Charge Measurement of 10 kV XLPE Cable under AC Voltage

作　　者：卢键[1] 陈广辉[2] 顾杰峰[3] 王伟[1] 何东欣[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,新能源电力系统国家重点实验室,北京102206 [2]泰安供电公司,山东泰安271000 [3]国网浙江省电力公司经济技术研究院,杭州310008

出　　处：《绝缘材料》2015年第6期34-38,44,共6页Insulating Materials

基　　金：国家重点基础研究发展计划(973计划)(2009CB724506);国家自然科学基金资助项目(51377056)

摘　　要：由于交流电压下的空间电荷在交联聚乙烯(XLPE)电缆绝缘老化过程中起到非常重要的作用,采用新研制的基于电声脉冲(PEA)法的空间电荷测量系统,对10 k V XLPE电缆本体在工频交流电压下的空间电荷进行测量。提出一种采用最高频率为200 Hz的继电器产生高压窄脉冲以及控制脉冲施加到固定工频相位的方法,实现一个工频周波下每隔22.5°为1个测试点,共计16个不同相位的空间电荷信息采集。结果表明:在外施交流电压90°和270°相位处测得的PEA信号峰幅值最大,在0°和180°相位处峰幅值最小。Space charge plays a very important role in the ageing process of cross-linked polyethylene （XLPE） cable insulation under AC voltage. A new space charge measurement system based on pulsed electro-acoustic（PEA） method was developed to measure the space charge of 10 kV XLPE cable under AC voltage. A relay with the highest frequency of 200 Hz was used to generate high voltage narrow pulse and control the pulse to regular power frequency phase, and every 22.5° as one test point under a power frequency cycle, a total of sixteen space charge information at different phases were collected. The results show that the PEA peaks reach the maximum value at 90° and 270° under AC voltage, and the peaks have the smallest amplitude at 0° and 180°.

关 键 词：交联聚乙烯电缆 空间电荷 电声脉冲法 交流电压 相位控制 

分 类 号：TM855.2[电气工程—高电压与绝缘技术]