应用等效场强法的特高压交流双回耐张塔刚性跳线及金具电晕试验

Equivalent Electric Field Strength Method Used in Corona Test of Rigid Jumpers and Fittings for UHVAC Double Circuit Tension Support

采用有限元法仿真计算了实际线路和试验简化模拟布置情况下刚性跳线及金具表面的电场分布；并利用等效场强方法进行了特高压交流耐张塔刚性跳线及金具的电晕试验研究，研究结果表明：铝管式、鼠笼式刚性跳线以及铝管式结构的相关金具满足电晕试验要求，鼠笼式结构的相关金具不满足电晕试验要求，建议将鼠笼式结构中部分间隔棒的线夹改成与铝管式结构中的椭圆型引流间隔棒一样，户外试验场各场强对比点处的起晕场强约在28．74～31．38kV／cm之间。试验结果可以在其它工程中得以参考应用。

Using finite element method the distributions of electric field on the surfaces of rigid jumpers and fittings under the conditions of actual transmission line and simplified simulated layout for the test are simulated. Using equivalent electric field strength method the corona tests on rigid jumpers and fittings for UHVAC double circuit tension support are performed, and test results show that the aluminum-tube type of rigid jumpers and squirrel cage type of rigid jumpers as well as interrelated fittings with aluminum-tube structure can meet the demand of corona test, however the interrelated fittings with the structure of squirrel cage cannot meet the demand. The corona inception field strengths at the field strength comparison points in outdoor testing field are within the range from 28.74 kV/cm to 31.38 kV/cm, and such a testing results are available for reference to other projects. It is recommended to change the clamps of partial spacers in the squirrel cage structure into the clamps of oval draught spacer in aluminum-tube structure.