Study on Lightning Back Strike Characteristics of 500 kV Quadruple-circuit-co-tower Transmission Lines
The 500 kV quadruple-circuit-co-tower transmission lines feature high voltage level,multiple circuits,and high tower height,and are prone to lightning back strikes.This paper reports a case analysis conducted on the SSZ tangent tower as the main tower type in an actual 500 kV quadruple-circuit-co-tower transmission lines between Yucheng Convert-er Station to Yushan,to study the lines'lightning back strike characteristics.The results show that with the increase of lightning current amplitude,lightning back strike occurs in succession in the first,the fourth and the sixth circuits.With the increase of tower height and tower impact grounding resistance,lightning resistance level decreases rapidly,and trip-ping rate increases rapidly.In addition,the influence of cross loadimpedance on lightning resistance of 500 kV quadruple-circuit-co-tower transmission line is ignorable.
quadruple-circuit-co-towerlightning back strike characteristicsmodeling and simulation
万方数据
