Lightning Performance of 110 kV Double-Circuit Transmission Lines without Ground Wire Using Line Lightning Protection Devices

One of the most popular way of enhancing lightning protection of 110 kV power transmission lines is the use of an overhead line ground wire (OHGW). However, there are situations where installing an OHGW is not feasible or effective, such as in mountainous regions or areas with high wire icing, leading to OHGW breakage. This leads to reducing lightning protection of the whole line and it needs to use alternative protective solutions. This study considers the methodology for determining the annual number of outages of a 110 kV double-circuit power line without the OHGW using the Monte-Carlo statistical method in presence and absence of lightning protection devices LLPD-110. The results of the statistical calculations allow to determine the effectiveness of various protection schemes, which allows selecting the optimal number of LLPD on 110 kV line and proposing double-circuit power transmission line from lightning overvoltages.