多重雷击下500 kV超高压站内MOA损坏原因分析OA

With excellent nonlinearity,good steepness response characteristics and large current capacity,Metal oxide arresters play an important role in power system overvoltage protection.In recent years,with the expansion of ultra-high voltage power grid coverage,the operation environment of power system is becoming more and more complex.There are many MOA damage accidents in 500 kV ultra-high voltage station under multiple lightning strikes,and most of the damage is the penetrating crack of MOA resis-tors.In order to explore the causes of MOA damage in 500 kV ultra-high voltage station under multiple lightning strikes,the EMTP-RV is used to simulate and analyze the action load characteristics and ener-gy accumulation of MOA in 500 kV station under multiple lightning invasion waves combined with the ac-tual recording diagram of a fault.According to the inherent temperature and energy characteristics of MOA,combined with the disintegration test and the actual absorption energy of MOA under multiple lightning strikes,the damage causes are revealed.The research conclusions have important reference val-ue for improving the action load capacity of MOA under multiple lightning strikes and improving the pro-tection characteristics of MOA under multiple lightning strikes.