电工技术学报  2016, Vol. 31 Issue (7): 152-158    DOI:
高电压与绝缘技术 |
工频电压下电缆本体的空间电荷测试
王伟1,2, 何东欣1,2, 易登辉1,2, 刘晗1,2, 卢键3
1.华北电力大学高电压与电磁兼容北京重点实验室 北京 102206
2.新能源电力系统国家重点实验室(华北电力大学) 北京 102206
3.国网冀北电力有限公司检修分公司唐山分部 唐山 063000
Space Charge Measurement on Cable Under AC Voltage
Wang Wei1,2, He Dongxin1,2, Yi Denghui1,2, Liu Han1,2, Lu Jian3
1.Beijing Key Laboratory of High Voltage & Electronmagnetic Compatibility North China Electric Power University Beijing 102206 China
2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
3.State Grid JiBei Electric Power Co.Ltd. Maintenance Branch Tangshan Branch Tangshan 063000 China
全文: PDF (2329 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 采用新的相位匹配方法,研制了交流电压下交联聚乙烯电缆本体的空间电荷测量装置。利用该装置进行了两组实验,以研究电缆的交流空间电荷特性。一是对电热老化90 d后的XLPE电缆进行2 h交流极化实验,二是对现场运行15年的电缆进行384 h温度梯度场下交流老化实验;在加压的过程中同时测量空间电荷。实验发现,工频50 Hz电压下电缆内部存在空间电荷;两组实验刚施加电压后,绝缘内部迅速出现随相位呈周期性变化的电荷;在第二组实验长时间老化过程中绝缘内部逐渐积累出不随相位变化的固定电荷。对于第一组实验,绘制总电荷量随交流相位的变化曲线,发现电压下降阶段的电荷多于对应相位的电压上升阶段的电荷,0°的电荷多于180°的电荷。该现象表明电荷复合滞后于电压下降,也间接证明了交流电压下空间电荷的存在。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
王伟
何东欣
易登辉
刘晗
卢键
关键词 空间电荷 交联聚乙烯 电缆 电声脉冲法    
Abstract:A new kind of AC space charge measurement instrument is introduced in this paper. It can measure the space charge of XLPE cable under AC voltage with a new AC phase matching method. Two experiments are carried out to research the AC space charge characteristics of the cable.Firstly the XLPE cable after electrical-thermal aging for 90 days is polarized for 2 h, and secondly the cable used for 15 years is aged under temperature gradient for 384 h.The space charge profiles are measured simultaneously in the two experiments and several phenomena are found.The space charges exist within the cable insulation under 50 Hz power frequency voltage. In both two experiments, the space charges, which changes periodically and follows the AC phase,appear instantly after the AC voltage is applied.In the second experiment, the steady charge, which do not change with the AC phase, is accumulated gradually within the cable insulation under long-time aging process. The changing curve of the total space charge with AC phases is plotted in the first experiment. It is found that the total charges when AC voltage declines are more than those when AC voltage rises; and the charges in 0° is more than those in 180°. This phenomenon indicates that the charge recombination lags behind the AC voltage declining, which indirectly certifies the existence of the space charge under AC voltage.
Key wordsSpace charge    XLPE    cable    pulsed electro-acoustic method   
收稿日期: 2015-02-28      出版日期: 2016-04-20
PACS: TM85  
基金资助:国家重点基础研究发展(973)计划(2009CB724506)和国家自然科学基金(51377056)资助项目。
作者简介: 王 伟 男 1960年生,教授,研究方向为高电压绝缘、电气设备在线监测与故障诊断。E-mail:wwei@ncepu.edu.cn;何东欣 男 1990年生,博士研究生,研究方向为电气设备在线监测与故障诊断。E-mail:hedongxin@yeah.net(通信作者)
引用本文:   
王伟, 何东欣, 易登辉, 刘晗, 卢键. 工频电压下电缆本体的空间电荷测试[J]. 电工技术学报, 2016, 31(7): 152-158. Wang Wei, He Dongxin, Yi Denghui, Liu Han, Lu Jian. Space Charge Measurement on Cable Under AC Voltage. Transactions of China Electrotechnical Society, 2016, 31(7): 152-158.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I7/152