高压电器2013，Vol.49Issue(2)：8-12,5.
改进电声脉冲法的交流空间电荷测量新方法
New Method for Space Charge Measurement Under AC Stress Via the Pulsed Electroacoustic Method
摘要
Abstract
A new method for space charge measurement resorting to the pulsed electroacoustic (PEA) method under HV AC stress is presented. This work consists in using a long memory digital oscilloscope to simultaneously measure both the piezoelectric signal and the applied AC stress for each voltage pulse. There is no need for synchronization between pulse generation and HV AC stress,and hence no hardware change of classic PEA system. The phase of the HV AC stress can be resolved into different profiles by frequency adjustment of the pulse generator. Several periods of the HV AC stress are necessary for obtaining the set of profiles. Preliminary results obtained on a low density polyethylene (LDPE)film under 50 Hz AC stress show that heterocharge can be formed in the region close to the lower electrode under AC electric field. The results captured from the new system have better phase resolution than the old system. The space charge decay profile measured by the new system can reflect vividly on the charge' s dynamic changing. The utmost space charge information can be saved as the measurement time is dramatically shortened by the improved system.关键词
聚乙烯/空间电荷/电声脉冲法/交流电压/电缆/老化Key words
polyethylene/ space charge/ pulsed electroacoustic method/ AC stress/ cable/ ageing分类
信息技术与安全科学引用本文复制引用
唐超,叶开颜,周天春,廖瑞金,George Chen..改进电声脉冲法的交流空间电荷测量新方法[J].高压电器,2013,49(2):8-12,5.基金项目
国家自然科学基金青年基金项目(51107103) （51107103）
重庆市自然科学基金项目(cstcjjA90013). （cstcjjA90013）
