Reduction of the number of faults caused by lightning for transmission line

In this paper, author considers three schemes to reduce the fault number caused by lightning on transmission lines. Three schemes considered in this research include increase in the insulator string length, surge arrester installation, and surge arrester installation in combination with increase in the insulator string length. A new algorithm is proposed to determine the best scheme which guarantees the number of faults caused by lightning satisfies the required value and its investment is the cheapest in them. With a fore-given required value of the fault number caused by lightning, this algorithm indicates the number of tower positions needing to improve and improving methods at those towers in detail. To verify this algorithm, a sample 220kV transmission line is used. With this transmission line and the desired value of fault number caused by lightning, the algorithm gives the lowest investment cost and it also demonstrated in detail which towers should install surge arrester, which towers should increase the insulator string length