The 10 KV three-phase resin-cast insulated dry-type power transformer is manufactured in compliance with the International Electrotechnical Commission (IEC) standard 60726 and the National Standards of the People's Republic of China GB/6450 and GB/10228, with an operating frequency of 50Hz.
link:https://www.chinasiliconsteel.com/silicon-steel-transformers/dry-type-transformer/10-kv-three-phase-resin-cast-insulated-dry.html