Parameter Analysis and Research on Sheath Lightning Overvoltage of Single-Core Cable

If lightning strikes on an overhead line connected with a cable, an over voltage will invade into this cable and induct an over voltage in its metal sheath. The sheath-lightning-overvoltage (SLOV) under one-terminal-grounding connection (OTGC) and cross-bonding connection (CBC) are simulated; and impulsive test was undertaken in real cable of Guangzhou power system. However it is hard to get the exact models and parameters. In this paper, based on the SLOV simulation, the effects of several factors, such as the cable structure and its length, stricken wave shape, magnitude and character of cable loads, the ground resistivity and impulsive grounding resistance are discussed. Simulation and discussion indicate that cable structure and its length, stricken wave shape, and magnitude and character of cable loads, have more influence to SLOV.