组合线状电极工频电场强度仿真方法研究

以变电站中母线、隔离开关和断路器区域接线为例,建立组合线状电极工频电场强度数学模型,基于模拟电荷-矩量法对距离地面1.5m高处平面内的工频电场强度进行仿真计算,通过与实际测量值比较,证明该方法是区域电场强度定量计算的一种简便方法,并得出以下结论:地面附近的电场强度主要由竖直方向分量决定,在隔离开关和断路器下方电场强度较强,母线下方电场强度相对较弱;组合线状电极几何位置发生改变,电场强度也会发生不同的变化。为此,提出安装设计建议:考虑电气设备之间的电气强度,适当增加架设高度,适当减小隔离开关与母线间距离。

Simulation Method for Power Frequency Electric Field Intensity of Linear Combination Electrode

With substation bus, isolating switch and circuit breaker regional connection for example, a mathematical model for power frequency electric field intensity of linear combination electrode is established. Based on charge simulation-the method of moments, the power frequency electric field intensity in the plane 1.5 m above the ground is simulated and calculated. The results are compared with the measured values, showing that the method is a simple and efficient means for quantitative computation of regional electric field strength. It is concluded that the electric field strength near the ground is mainly dependent on the vertical direction component; the electric field strength is stronger under the isolating switch and circuit breaker, and weaker under the bus; the electric field strength varies with the geometric position changes of linear combination electrode. Suggestions on installation and design are offered, which include taking into account the electrical strength among electrical devices, appropriately increasing the erection height and decreasing the distance between isolating switch and bus.