Improving the efficiency of means for lightning protection in main electric networks by the example of MES Vostoka (Main Electric Networks of the East, branch of PAO Rosseti). The factors that caused emergency outages of 220-kV overhead power-transmission lines for the period from 2017 to 2024, as well as technical solutions and experience gained based on the operation of lightning protection systems are considered. The technical solutions concerning the construction of power-transmission-line tower grounding systems are made taking into account the effect of soil resistivity and include the use of salt and graphite grounding conductors. The measured and calculated (after upgrading) values obtained for the impulse impedances of the 220-kV power-transmission-line tower grounding systems are compared with each other. The main direction of activities aimed at improving the reliability and lightning resistance of power lines consists in the use of externally gapped line arresters (EGLAs). Systematized data based on the operational experience concerning the number of lightning-induced outages, line arrester damageability, as well as recommendations for their use are presented. The efficiency of using EGLAs to improve the reliability and to enhance the lightning resistance of a 220-kV transmission lines in the zones with a high resistivity of soils has been demonstrated. The operational characteristics concerning the number of 220-kV transmission-line lightning-induced outages within the periods before and after the installation of line arresters, and the statistics of emergency power line outages caused by the arresters installed therein are analyzed.
Kiselev et al. (Sat,) studied this question.