Research on Lightning Overvoltage of 500 kV Submarine Cable Lines
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Abstract
This paper built the simulation calculation model of lightning intruding wave for 500 kV overhead lines and submarine cable lines of Hainan interconnection project, with using ATP-EMTP software.The maximum shielding failure current of overhead lines was calculated by electrical geometry model (EGM) and the leader propagation flashover model was used as the criterion for insulators and air gap flashover.Then, the lightning overvoltage of submarine cable was calculated after overhead lines suffering from the lightning shielding failure and counterattack. Finally, the submarine cable's insulation level for lightning impulse and lightning arrester was checked.The results show that the maximum lightning overvoltage of submarine cable are -916 kVand -923 kV after overhead lines suffering from the lightning shielding failure and counterattack. And the insulation margin of submarine cable and the installation of lightning arrester meets the requirements.
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