CAJ | 학술논문

高压直流电缆绝缘材料中空间电荷特性是制约直流电缆性能的关键因素。聚乙烯纳米复合材料因具有优异的空间电荷抑制特性，而被成功运用于高压直流电缆。本文研究了以半导电料为基体，以CNFs粒子，通过对其进行表面改性，使CNFs在材料中沿磁场方向取向，而后再与LDPE进行复合，制成双层样片。并且使用电声脉冲法（PEA ）分析了复合材料在加电压与短路时的空间电荷的分布。研究发现，掺杂浓度与取向对复合材料的空间电荷影响较大。取向CNFs/LDPE半导电层的添加改变了载流子的输运方式，抑制了空间电荷由电极向绝缘层中的注入。这对于取向CNFs/LDPE复合材料在高压直流输电中的应用是非常有意义的。
고압직류전람절연재료중공간전하특성시제약직류전람성능적관건인소。취을희납미복합재료인구유우이적공간전하억제특성，이피성공운용우고압직류전람。본문연구료이반도전료위기체，이CNFs입자，통과대기진행표면개성，사CNFs재재료중연자장방향취향，이후재여LDPE진행복합，제성쌍층양편。병차사용전성맥충법（PEA ）분석료복합재료재가전압여단로시적공간전하적분포。연구발현，참잡농도여취향대복합재료적공간전하영향교대。취향CNFs/LDPE반도전층적첨가개변료재류자적수운방식，억제료공간전하유전겁향절연층중적주입。저대우취향CNFs/LDPE복합재료재고압직류수전중적응용시비상유의의적。
Under high voltage condition ,space charge is the key that inhibit the performance of the DC cable .Polyethylene nanocomposites have excellent space charge inhibition characteristics ,and has been successfully used in high-voltage DC cables .In this paper ,the semi-conductive materials as the matrix ,the carbon nanofibers (CNFs) were surface-metallized and the CNFs oriented along the magnetic field direction in the semi-conductive materials ,and then with LDPE composite made double samples .Use pulsed electroacoustic (PEA ) method ,analysis space charge behavior in the applied voltage and short circuit .The results showed that the space charge of the composite material had great influence due to the doping concentration and orientation .Oriented CNFs/LDPE were successful in changing the carrier transport and suppressing the injection of the space charge along the thickness direction .That was extremely meaningful in HVDC .