Calculation and analysis of 500kV double-circuit on the same tower shielding failure trip-out rate based on Monte Carlo Method
Chenhui Zhao · Heilongjiang Electric Power · 2010
Since strike is highly random,this paper adopts Monte Carlo Method combined with electro geometric model to calculate 500 kV double-circuit on the same tower shielding failure trip-out rate.In calculation,the maximum shielding failure current is the corresponding lightning current when exposure arc is 0.The paper also analyzes how dip angle and tower structure influence shielding failure trip-out rate.Calculation proves that with the increase of dip angle shielding failure trip-out rate increases at first and then reduces;shielding failure trip-out rate reduces with the increase of lightning wire's cross arm;as for double-circuit transmission line on the same tower,shielding failure trip-out rate should be calculated separately.By this method,the conductor of high shielding failure trip-out rate could be strengthened on the aspect of insulation to enhance lightning resistance of transmission line.