一种分裂导线直流电晕起晕电压的计算方法

A Novel Calculation Method for DC Corona Onset Voltage of Bundle Conductors

提出了一种分裂导线直流电晕起晕电压的计算方法,其核心思想是将分裂导线的二维电场分布下的起晕问题转化成相对简单的导线-圆筒结构的一维电场分布下的起晕问题,其中,等效导线-圆筒结构的电场分布与分裂导线下最大电场强度方向的电场分布相同,等效导线-圆筒结构的导线半径与分裂导线子导线半径相同。搭建了电晕实验模型,通过直流起晕实验,分别获得了分裂导线施加正、负极性电压起晕后的电流-电压特性曲线,并用线性拟合的方法进一步获得了几种分裂导线结构的起晕电压。实验结果与所提计算结果吻合,验证了本文所提计算方法的有效性。

Based on the idea of establishing an equivalent relation between the bundle structure and a line-cylinder structure, this paper proposes a simple calculation method for direct current（DC） corona onset voltage of bundle conductor wires. The line-cylinder structure has a one dimension distribution of electric field and hence is easier to be handled. It is assumed that, the field distribution of the equivalent line-cylinder structure is identical to that of the bundle structure in the maximum field direction, and its radius is also equal to that of each sub-conductor. Onset voltages of several types of bundle structure conductors are determined by current-voltage curve obtained experimentally. presented method are in good agreement with the using linear fitting method to analyze the corona It is shown that, the calculated results from the experimental results.