一种超高压输电线路恢复电压的精确计算方法

在超高压输电线路上单相重合闸的成功取决于故障处潜供电弧能否快速自熄,恢复电压和潜供电流是影响潜供电弧的决定性因素.分析了影响恢复电压的主要因素,对不带并联电抗线路提出了利用系统和线路参数以及负荷电流,精确计算恢复电压的方法,并通过EMTP仿真数据证明了该方法的正确性,该仿真结果可以用到高压输电线路保护装置中的自适应重合闸判据中.

An Accurate Method for Recovery Voltage Calculation on Extra High Voltage Transmission Lines

Single phase adaptive reclosing technology improves the reliability and the stability of the power system. A successful reclosing is depended on quick and automatic extinction of the secondary arc. The factors affecting the secondary arc are recovery voltage and secondary arc current. The paper proposes a method to calculate the accurate recovery voltage of transmission line without series capacitor by using system and line parameters. Then the main factors affecting recovery voltage are detailed discussed. It shows that recovery voltage is related to transmission line voltage rate, transmitted power, conductor spatial arrangement and line parameters. Simulation results from Electro-Magnetic Transient Program （EMTP）validates the proposed method.