Transient Over Voltages in Cross-Bonded Power Cables due to Lightning Impulse

A cable in its lifespan undergoes different transient phenomena, especially lightning. The impact of the lightning impulse was greater on the section near the termination which connects the transmission line and cable. The impact of lightning on the sheath was performed in this study using a circuit analysis for a cable with cross bonded. A simulation study presents the profile of transient voltage buildup in the sheath of a three-phase 220 kV underground power cable along the length of the cable. Since large induced voltage in the sheath may cause serious problems like an increase in the circulating current which in turn produces excessive heat that may start the melting process of the sheath and it may damage the jacket of the cable also. Due to high voltage stress between the conductor and sheath of the underground power cable, it may prematurely damage the main insulation and may lead to the failure of the power cable. The main objective of the paper is to study the transient voltage induced in the sheath of a three-phase cross-bonded underground power cable due to the lightning surge effect in the main conductor.