CAJ | 학술논문

变电站内电气设备存在绝缘缺陷可能在运行时尤其当运行状态或运行环境改变的情况下发生局部放电（PD）从而辐射出超高频（UHF）电磁波到变电站空间中。为研究用UHF法监测变电站电气设备PD，用一套固定天线阵列及其配套设备实现监测整个变电站PD及早期预警的目的，在变电站中心位置安装全向天线传感器组成的固定阵列来接收变电站空间中电气设备因PD辐射出的UHF信号，根据检测到的信号判定PD的发生并找到存在PD的电气设备；以宽频带、高增益、水平面（H面）全向性的盘锥天线为UHF传感器构建了监测系统，在变电站试验中系统检测到了放电信号，成功定位了位于隔离开关处的放电源。现场实测结果表明这是一种具有实用价值的变电站全站PD监测及早期预警方法。
변전참내전기설비존재절연결함가능재운행시우기당운행상태혹운행배경개변적정황하발생국부방전（PD）종이복사출초고빈（UHF）전자파도변전참공간중。위연구용UHF법감측변전참전기설비PD，용일투고정천선진렬급기배투설비실현감측정개변전참PD급조기예경적목적，재변전참중심위치안장전향천선전감기조성적고정진렬래접수변전참공간중전기설비인PD복사출적UHF신호，근거검측도적신호판정PD적발생병조도존재PD적전기설비；이관빈대、고증익、수평면（H면）전향성적반추천선위UHF전감기구건료감측계통，재변전참시험중계통검측도료방전신호，성공정위료위우격리개관처적방전원。현장실측결과표명저시일충구유실용개치적변전참전참PD감측급조기예경방법。
We researched the UHF-based method for PD monitoring of electrical equipment in the substation, which could use a fixed antenna array and relevant corollary equipment to monitor PD for the whole substation and to achieve early warning. Omnidirectional antenna array was placed in the centre of substation to receive UHF signals triggered by faulted equipment in substation space, PD existing in substation could be detected and the electrical equipment with PD could be found according to the measured signals. Thereby, we built a monitoring system with wideband, good gain and horizontal plane omnidirectional disc-cone antenna as UHF sensor, in the substation test, system detected the discharge signals and discharge source in disconnector were located by the signals. The site measurement results prove that this is a useful method for PD monitoring of the whole substation and early warning.