Simulation Study on Lightning Protection of New 500 kV Lightning-proof Line Insulator

摘要

Line arrester is an important lightning protection method for 500kV extra-high voltage (EHV) transmission lines. The current Zinc Oxide Arresters have shortcomings in performance, installation, in this paper, lightning-proof insulators with excellent lightning protection characteristics are adopted. The ATP-EMTP simulation is used to analyze the transmission line when it was subjected to the most serious conditions of counter-attack and lightning shielding failure, including energy releasing condition of the lightning-proof insulator, and the maximum withstanding lightning current after the lightning-proof insulator replaces the ordinary insulator. The simulation results show that the lightning protection insulator circuit can avoid the grounding fault of the transmission line, especially in the terrain where the grounding resistance is difficult to reduce; In the case of 800A 2ms square wave flow capacity is 1237kJ, the influence of lightning counterattack on the operation of the lightning protection type insulator is negligible with respect to the lightning shielding failure current and the maximum tolerated lightning shielding failure current amplitude of the 500kV line is −84kA ,which meets line lightning protection requirements.