考虑变电站内开关设备影响时站内工频电场的计算方法

高压变电站内工作走廊的工频电磁场评估已经日益重要。因此,笔者基于边界元法(BEM)与模拟电荷法(CSM),研究了考虑变电站内关键设备影响时,变电站工作走廊内的工频电场计算模型与方法。针对变电站内设备的结构特性,推导了悬浮电极、介质分界面的间接边界积分方程,以及相应的代数方程与矩阵元素的计算公式,实现了在考虑站内主要设备影响的前提下,变电站内工频电场的计算方法。最后以一个500 kV变电站为例,进行了站内单个设备与单相设备的工频电场计算,并采用了IES-Coulomb软件进行了仿真,验证了计算结果的正确性。文中模型与方法可用于计算特高压变电站内的工频电场,因此在进行特高压变电站设计时,可采用该方法对变电站工频电场进行估算,改善工作走廊的工频电场分布。

Calculation Method of Power Frequency Electric Field in High Voltage Substation Considering the Interference from Switching Equipment

For evaluating power frequency electromagnetic field in working corridor of a high voltage substation,a calculation model of power frequency electric field in working corridor of high voltage substation is proposed by combining boundary element method(BEM) and charge simulation method(CSM) and by considering the interference from switching equipment.According to the structural characteristics of equipment in substation,indirect boundary integral equation of the interface of the suspension electrode and the dielectric is deduced,and the corresponding algebraic equations and calculation formulas of matrix elements are presented.Caculation method of the power frequency electric field in substation is implemented.Furthermore,a typical 500 kV substation is taken as an example to calculate the power frequency electric fileds of single equipment and single-phase equipment in the substation,and simulation is performed with the software IES-Coulomb to verify the correctness of the calculation.The proposed model and calculation method can be applied to design of UHV substation for estimating the power frequency electric field and improving the electric field distribution in working corridor.