CAJ | 학술논문

在带电条件下的局部放电检测是反映封闭开关柜内部绝缘状况的有效手段。为此，首先根据电磁学基本原理分析了暂态对地电压（transient earth voltages，TEV）的产生机理，然后利用XFDTD软件仿真分析了TEV幅值和脉宽与激励源脉冲幅值、脉冲宽度、检测距离之间的关系。仿真结果表明：TEV的幅值与局部放电源的幅值成正比，且随着检测距离的增大而减小，随着局部放电源脉冲宽度的增加而减小；TEV的脉宽随局部放电源脉宽的增大而增大，与检测距离无关。为开展开关柜局部放电的带电检测工作提供了理论依据。
재대전조건하적국부방전검측시반영봉폐개관거내부절연상황적유효수단。위차，수선근거전자학기본원리분석료잠태대지전압（transient earth voltages，TEV）적산생궤리，연후이용XFDTD연건방진분석료TEV폭치화맥관여격려원맥충폭치、맥충관도、검측거리지간적관계。방진결과표명：TEV적폭치여국부방전원적폭치성정비，차수착검측거리적증대이감소，수착국부방전원맥충관도적증가이감소；TEV적맥관수국부방전원맥관적증대이증대，여검측거리무관。위개전개관거국부방전적대전검측공작제공료이론의거。
The principle of transient earth voltages （TEV） was analyzed by electromagnetics, and the finite-difference time-domain （FDTD） method was employed to simulate the propagation law of TEV in the switchgear. The simulation results show that, the TEV amplitude is proportional to the PD pulse amplitude, increases as PD pulse width decreases, and decreases as the distance between detection point and PD source increase. The TEV pulse width increases with that of excitation increasing, and is not affected by the amplitude of excitation or the detection distance.