Profile: Dalian Tucheng International Trading co., Ltd is specializing in manufacturing and exporting insulators, metal fittings and bushings for power transmission lines and substations. We are accredited with ISO 9001 certification. Our station post insulator is mostly used in substations. It is an insulator of generally columnar shape, and it consists of one post insulator unit or an assembly of such units and is intended to give rigid support to a live part, which is insulated, from earth or from another live part.