MOA analysis of large hydropower station

Zinc oxide arrester, aka metal oxide arrester (MOA), is widely used to protect electrical equipment in large hydroelectric power stations. This article takes the Yangfanggou Hydroelectric Power Station as an example to expound on the mathematical model of the zinc oxide arrester at the station. A simulation circuit is then established to simulate and analyze the leakage current of the zinc oxide arrester under lightning strike and normal voltage conditions. By analyzing and comparing the results, the relationship between the leakage current and voltage harmonic and phase is obtained, providing guidance and assistance in judging the voltage quality of the Yangfanggou Hydroelectric Power Station.