高电压技术2017，Vol.43Issue(5)：1677-1683,7.DOI:10.13336/j.1003-6520.hve.20170428038
基于外半导电层注入的全尺寸电缆用脉冲电声法空间电荷测量技术
PEA Space Charge Measurement Technology for Full-scale Cables Based on Pulse Injection from Outer Semi-conductive Layer
摘要
Abstract
High-voltage cross-linked polyethylene (XLPE) cable is a critical setup in high voltage direct current (HVDC) transmission.However,space charge effects in cable insulation under DC stress cause a serious distortion of internal electric field,which will affect cable's long-term reliability during operation.So it is very important to measure the space charge profiles of the full-scale cables in real time.In this paper,based on PEA space charge measurement technology,the width and amplitude of pulse and the thickness of piezoelectric transducer were selected reasonably according to the thickness of test cables.Moreover,the measurement of space charge profiles for long cables under high voltages was realized by pulse injection from the outer semi-conductive layer of cable.Then the acoustic transmission characteristics and waveform correction method in coaxial cables were analyzed simultaneously.The results show that the pulse injection through outer semi-conductive layer is the most simple and effective way to measure space charge characteristics in long cable under high voltages.However,the pulse amplitude may attenuate due to partial voltage dividing in the semi-conductive layer.The accuracy and resolution of measurement system can be achieved through reasonable selection of the amplitude and width of pulse as well as the thickness of piezoelectric sensor.Besides,oscilloscope in this system is isolated from ground,and the digital optical isolation technology is used between computer and oscilloscope.Therefore,the restriction of traditional analog fiber to the frequency band of measuring waveform will be avoided effectively.关键词
同轴电缆/空间电荷/全尺寸/脉冲电声法/外半导电层/数字光纤/波形校准Key words
coaxial cable/space charge/full scale/PEA/outer semi-conductive layer/digital fiber/waveform calibration引用本文复制引用
王霞,陈驰,熊锦州,吴锴,傅明利,侯帅..基于外半导电层注入的全尺寸电缆用脉冲电声法空间电荷测量技术[J].高电压技术,2017,43(5):1677-1683,7.基金项目
国家自然科学基金(51377131).Project supported by National Natural Science Foundation of China(51377131). （51377131）
