... 220kV AC system, electric railway, transmission line, substation, distribution Surge arrester, lightning arrester, Metal Oxide Surge Arrester, surge divrtor, surge protectorspecializes in producing 0.28 to 220kV AC system ... 0.28~220kV AC system metal oxide surge arresters and electric railway surge arresters with porcelain and polymeric housing for protection against over-voltage damage ...