LZZBW-17.5 current transformer adopts outdoor imported cycloaliphatic resin casting and belongs to support type full-closed structure, encloses primary & secondary windings and annular core in the epoxy resin casting body. The product has the feature of light weight, omni-directional installation, withstanding nastiness and dampness. It is widely used for measuring current, electric energy and protective relaying in the electrical system with the rated frequency 50Hz or 60Hz and highest voltage for equipment 17.5kV.