In follow have 3 series potential/voltage transformer (1)JDZ, JDZJ-6, 10 , JDZ9-6, 10 type potential/voltage transformer The JDZ, JDZJ-6, 10 JDZ9-6, 10 type potential/voltage transformer are cast-resin insulated, single phase potential/voltage transformer with earthing protection (2)JDZ72-12 potential/voltage transformer The JDZ72-12 potential/voltage transformer are cast-resin insulated , single phase potential/voltage transformer (3)JDZX9-10 , JDZ10-10 potential/voltage transformer The JDZX9-10 , JDZ10-10 potential/voltage transformer are cast-resin insulated , single phase potential/voltage transformer The JDZX6-35 potential/voltage transformer are cast-resin insulated, single phase potential/ voltage transformer with residua winding and fully enclosed used for metering electric energy;voltage control and relay protection in the electric system up rotated frequency 50HZ or 60HZ and rated voltage transformers can be executed according to the standards:IEC60044-2:1997 and GB1207-1998.