About Approach To Solution of Problem Of Protection Against Earth Faults in 6-10 kV Cable Networks With Different Neutral Grounding Modes

Abstract

About half of the electricity generated in Russia is distributed through electric cable networks of medium voltage of 6-35 kV [1]. 6-10 kV networks account for more than 99% of total length of medium voltage cable networks [2]. The predominant type of damage in these networks is single phase earth fault (SPEF), often arcing. SPEFs are often the primary cause of outages of cable lines and electric motors. Therefore, the reliability of power supply to consumers largely depends on the technical perfection (selectivity and stability of operation [5]) of protection against earth faults.