【摘要】 空气间隙的放电特性是特高压输电线路设计的重要指标,沙尘天气会对空气间隙的放电特性产生影响。为更加深入地研究沙尘条件下空气间隙的放电特性,文中针对弥漫沙尘的棒—板空气间隙的电场分布进行了仿真。仿真考虑了间隙中弥漫沙尘时介质的不均匀性,建立了三维仿真模型,改进了以往改变介质介电常数模拟介质特性变化的方法。根据电场仿真的结果,沙尘分布于间隙中时,沙粒周围电场出现了明显的畸变。沙粒周围电场升高的方向总是指向棒极末端的方向,而在沙粒与棒电极连线的垂直方向上电场降低,该方向的电场值低于周围区域。沙粒的存在只会影响其5倍半径以内区域的电场分布。沙尘质量分数较低时,沙粒对棒电极表面以及距沙粒较远的区域的电场分布所产生的影响很小。更多还原

【Abstract】 The discharge characteristic of air gap is one of the key control factors of the insulation level of transmis-sion line. Sandstorm has a certain effect on the discharge characteristics of air gap. To understand this effect,in thispaper,the electric field distribution of the rod-plane air gap under sandstorm condition is simulated. The inhomoge-neity of medium is considered when the sand particles present in the gap,and detailed three-dimensional simulationmodels are established,using this simulation model,the electric field intensity in the gap is calculated. Based on thecalculation result,the electric field in the area around the sand shows an obvious distortion. The electric field in-creases in the direction from the sand particle to the end of the rod electrode;and the electric field decreases in thevertical direction. The existence of sand particles can only affect the distribution of electric field in the region of 5 times of its radius. And the effect of sand particles on the electric field distribution in the surface of the rod electrodeand the region far away from the sand is very small.更多还原