CAJ | 학술논문

针对110 kV XLPE电缆中间接头及本体制作了6种人工典型缺陷，并利用高频电流互感器耦合局部放电信号。对各类缺陷放电脉冲进行时域、频域特征分析，研究同一缺陷相同电压下不同放电时刻单脉冲波形和频谱规律，并对不同受损程度的电缆本体缺陷局部放电参数的变化进行分析。结果表明：当本体电缆波纹铝破损但未伤及主绝缘时，局部放电无法发现该类缺陷；当主绝缘破损时，在较低电压下便可检测到局部放电，但耐压试验依然可以通过，且随着主绝缘破损深度的增加，局部放电起始电压呈线性递减。
침대110 kV XLPE전람중간접두급본체제작료6충인공전형결함，병이용고빈전류호감기우합국부방전신호。대각류결함방전맥충진행시역、빈역특정분석，연구동일결함상동전압하불동방전시각단맥충파형화빈보규률，병대불동수손정도적전람본체결함국부방전삼수적변화진행분석。결과표명：당본체전람파문려파손단미상급주절연시，국부방전무법발현해류결함；당주절연파손시，재교저전압하편가검측도국부방전，단내압시험의연가이통과，차수착주절연파손심도적증가，국부방전기시전압정선성체감。
Six kinds of artificial typical defects of 110 kV cable and joint were produced, and high frequency current transformer (HFCT) was used to couple the PD signals. The PD pulse of different defects in time domain and frequency domain were analyzed. The monocycle pulse waveform and frequen-cy spectrum at different discharge moments of the same defects under the same voltage were studied, and the changes of PD parameters of the cable bulk defects with different degree of damage were analyzed. The results show that when the corrugated aluminum is damaged but the insulation of the cable is undamaged, these defects could not be detected by PD detection. Once the insulation of the cable is damaged, the PD can be detected under lower voltage, but the cable can pass through the with-stand voltage experiment. With the increase of the depth of insulation damage, the initial partial discharge voltage decrease linearly.