CAJ | 학술논문

交联聚乙烯(XLPE)中的累积电荷是造成电力电缆局部电场集中、引发电树枝和绝缘击穿事故的重要原因.为考察对保障XLPE电缆的安全运行十分重要的累积电荷的衰减机理,以不同温度交联形成的XLPE薄膜为试样,通过电晕充电法向试样注入电荷,采用静电电位计测量试样表面电位,分析了交联温度对累积电荷衰减特性的影响.结果表明,正、负电荷均呈现非线性衰减特性,正电荷衰减程度高于负电荷;随着交联温度的升高,正、负电荷的衰减速度均先减小后增大.最后得出交联剂过氧化二异丙苯(DCP)在交联过程中分解产生的副产物苯乙酮及水分,是影响电荷衰减特性的主要原因.
교련취을희(XLPE)중적루적전하시조성전력전람국부전장집중、인발전수지화절연격천사고적중요원인.위고찰대보장XLPE전람적안전운행십분중요적루적전하적쇠감궤리,이불동온도교련형성적XLPE박막위시양,통과전훈충전법향시양주입전하,채용정전전위계측량시양표면전위,분석료교련온도대루적전하쇠감특성적영향.결과표명,정、부전하균정현비선성쇠감특성,정전하쇠감정도고우부전하;수착교련온도적승고,정、부전하적쇠감속도균선감소후증대.최후득출교련제과양화이이병분(DCP)재교련과정중분해산생적부산물분을동급수분,시영향전하쇠감특성적주요원인.
Cross-linked polyethylene (XLPE) films were employed as test samples to investigate the charge decay behavior by means of surface potential decay. The samples were cross-linked by adding dicumyl peroxide (DCP) as cross-linking agent into low density polyethylene with temperature ranged from 150 ℃ to 180 ℃. Surface potential was measured by electrostatic probe after corona was charged for 5 minutes. The results show that charge decay behaves non-linearly. With the increase of the temperature, the decay rate decreases initially then tends to increase. It is suggested that space charge behavior depends upon the concentration of cross-linking byproducts which is varied as a function of the temperature.