GSWFK 10...72,5 (12-72,5kV) Outdoor Cascade Current Transformer. The current transformer is designed for outdoor use. The cascade current transformer consists of the GSWF lower stage and the GSOF upper stage. The upper and lower stages are connected by busbars. The potential connection on the high voltage side is located on the busbar. The insulation of the transformer is performed in one operation with cycloaliphatic epoxy resin prepared under vacuum (full encapsulation).