500 kV海底电缆雷电过电压研究
Research on Lightning Overvoltage of 500 kV Submarine Cable Lines
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摘要:
依托南方主网与海南电网联网工程，运用ATP-EMTP电磁暂态分析软件，建立了500 kV架空线路与海底电缆线路的雷电侵入波仿真计算模型，采用修正后的电气几何模型法来计算最大绕击雷电流，采用先导发展法作为绝缘子串和空气间隙放电闪络判据，计算架空线路遭受绕击和反击时，无避雷器和有避雷器2种情况下海底电缆主绝缘上所承受的雷电过电压，据此校核海底电缆雷电冲击绝缘水平及避雷器配置的合理性。研究结果表明，合理配置避雷器大大降低了雷电过电压对海缆的影响，在架空线路遭受绕击和-250 kA雷电流反击时，海底电缆最大雷电过电压分别为-916 kV和-923 kV，海底电缆绝缘裕度和避雷器配置满足防雷要求。 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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