DTSY345 three—phase static watt—hour meter makes use of importing special large—scale jntegrate circuit 16 digit A／D changeover，digital multiplier,sampling and handling technology of digit and SMT technology,it is a new meterdesigned and manufactured according to users’real situation of power utilization Because of employing independentthree．unit measuring module it iS able to measure three phase positive and negative active energy accurately Themeasuring error has excellent long—time stability Top quality Ta capacitance iS selected for the watt-hour meter,so its service life iS quite Iong and it can prevent thieving actions from error phase Sequence current reversing different phase between voltage and current．voltage breaking，zero wire breaking．its perfo rmance conforms to each itern technicaI requirement of three—phase watt—hour meter stipulated in GB/T18460 3—2001 idt IEC 1036—1996 Its purpose is to measure three-phase active energy of rated frequency 50-60HZ．

应用计算机管理，先购电后用电；在额定电流范围内能限制使用功率(由供电部门限定)；一表一卡，专卡专用，失卡不失电，补卡再用；电卡能双向传递数据；能自动断电告警用户购电；电量为零时，自动拉闸断电；并具有一定的防窃电软件设计等。适用于频率为50Hz或60Hz有功电能计量，安装于室内或室外表箱内使用。适用于环境温度为-10℃～+50℃，相对温度不超过85％，且周围空气中不应有腐蚀性气体，避免尘砂、盐雾、凝露等影响。

Adopt the mode of computer control first pu rchasing electricity then using it；it can Iimit max service power(Specified by electric power department)in the rated current range；one meter with one card，special card for special application，no lose electricity if Iosingcard，reuse electricity through renewing the card；the electric card can transmit the data；when the electricity quantity is zero，it can switch off the power automatically to warn users shall purchase the electricity；besides it has certain software design of anti—thieving electricity Applicable for measuring 50 Hz or 60Hz active energy，it is installed inside or in the box outside It is used in the best place that the environment temperature is -10℃～+50℃ and relative humidity is not beyond 85％，the ambient air can’t contain the corrosive gas，dust，salt fog，condensation，etc..