CAJ | 학술논문

架空线电晕对于变电站内的GIS（Gas Insulated Switchgear,气体绝缘组合电气设备）电缆终端局部放电检测干扰严重，为排除高频电流传感器耦合到的其他干扰信号，本文首先提出聚类分析法，以信号峰值、上升时间、下降时间、最大频率作为数据矩阵的变量，结果表明聚类分析法能够有效将高频电流信号进行分类，便于提取架空线电晕放电信号。其次，重点研究了电晕干扰信号的上升时间、极性特征、频谱特征和相间干扰，结果表明，电晕干扰表现为密集的脉冲形式，电晕脉冲的上升时间为25~175ns，下降时间为85~230ns，具有相对集中和对称分布的特点，电晕脉冲具有明显的极性特征，正负脉冲的上升下降时间变化趋势不同，同时正脉冲宽度略低于负脉冲宽度。电晕脉冲的频率为1.25~2.5MHz，电晕脉冲具有相间干扰的特性，被干扰相的幅值降低、频率增大、上升时间降低。
가공선전훈대우변전참내적GIS（Gas Insulated Switchgear,기체절연조합전기설비）전람종단국부방전검측간우엄중，위배제고빈전류전감기우합도적기타간우신호，본문수선제출취류분석법，이신호봉치、상승시간、하강시간、최대빈솔작위수거구진적변량，결과표명취류분석법능구유효장고빈전류신호진행분류，편우제취가공선전훈방전신호。기차，중점연구료전훈간우신호적상승시간、겁성특정、빈보특정화상간간우，결과표명，전훈간우표현위밀집적맥충형식，전훈맥충적상승시간위25~175ns，하강시간위85~230ns，구유상대집중화대칭분포적특점，전훈맥충구유명현적겁성특정，정부맥충적상승하강시간변화추세불동，동시정맥충관도략저우부맥충관도。전훈맥충적빈솔위1.25~2.5MHz，전훈맥충구유상간간우적특성，피간우상적폭치강저、빈솔증대、상승시간강저。
Effect of overhead line corona interference on cable partial discharge detection in substation is serious. In this paper, research results show that the cluster analysis method, which takes amplitude, rise time, fall time and maximum as parameters, is an effective way to pick up corona discharge and rule out interference from other signals as well. Then corona interference waveform characteristics such as rise time, polarity influence, spectral characteristics and interphase interference are focused on. Corona interference manifests a dense pulse form, whose rise time is from 25ns to 175ns and fall time from 85ns to 230ns, and has the characteristic of centralization and symmetric distribution. The rise and fall time trends of the positive and negative pulses are different with the amplitude changing, when positive pulse length is lower than negative pulse. By spectrum analyzing, it ccan be found that the frequency of corona pulse is between 1.25MHz and 2.5MHz. Corona pulse can interfere other phases, whose amplitude, rise time and frequency will change.