In 2015, Hebei Gaojing rolled off China’s first S13-type 110kV three-phase oil-immersed tridimensional toroidal core power transformer. The product’s enterprise standard was subsequently elevated to a Hebei Provincial Standard. Its technical achievements were certified as reaching the international advanced level and earned the First Prize of Handan City Science & Technology Progress Award in 2018. This milestone established Gaojing — and by extension Apex Power Systems — as the authoritative source for tridimensional toroidal core transformer technology in China.