The LXK zero sequence current transformers are used in indo or environment, and provided for non-direct earthed neutral systems of rated frequency of 50/60 Hz and rated voltage of 35kV and below. The relay DD-11/60 or DD-1/60 matches with this model. The products meet standards IEC60044-1 and GB1208-2006. The products are used in metering electric energy, voltage controlling and relay protection applications.