JDZ(J)-3,6,10 type single-phase double coil voltage transformer of epoxy casting insulation for indoor device use, is used for measurement of voltage and electric energy, relay protection in neutral non-direct earthing system of rated frequency 50Hz as well as for other control device power Convert the high voltage into a standard secondary voltage of 100V or lower in proportion to the use of protection, metering, and instrumentation devices. Use of voltage transformers to isolate high voltages from electrical workers Ambient temperature:-10ºC-+40ºC Relative humidity:The average humidity of a day should be no more than 95%. The average humidity of a month should be no more than 90%. Earthquake intensity: not exceed 8 degrees. Saturated vapor pressure the average pressure of a day should be no more than 2.2kPa; the average pressure of a month should be no more Than1.8Kpa; The height above sea level:≤1000 m (Except special requirements) It should be installed in the places without fire, explosion, serious filth, and chemical erosion and violent vibration.