Electronic Single-phase Prepaid Energy Meter

DDSY520 Electronic Single-phase Prepaid Energy Meter(RF Card)Descriptions: DDSY520 electronic single-phase prepaid energy meter is a full electronic energy meter with RF card to measure the single-phase AC active power at 50Hz or 60Hz.It can supply electric power only after being repaid by users.When the electric power in the RF card is used up,the power will be cut off automatically. The product adopts advanced microelectronic technology and SMT manufacturing technique,and completely conforms to GB/T17215-2002 standard and GB/T18460.3-2001 standard. Applications: Designed for time-sharing electricity metering of new or reconstructed single-phase user. With prepayment function, it is particularly suitable to solving payment-collecting difficulties in residential area ,organization ,factories ,mines and schools etc..It is preferable in promoting the management level at demand side ,inducting the users to better power consumption style to improve efficiency and electric sources collocation. Working Principle: There are two basic function modules in the energy meter separately named energy-metering module and MPU-controlling module. The energy-metering module adopts advanced special integrated circuit-ADE7755. The two analogue-to-digital converters in ADE7755 digitise the output of current and voltage sensors,and the true power into the load is represented in terms of the equivalent frequency at F1 and F2 output points.The pulse frequency is sent to MPU. The MPU-controlling module accumulates the consumption power ,processes data,reads or writes RF card,controls magnetism-keeping relay operating and LCD or digester display. Functions and Features: ·Imported chips with high precision which could precisely calculate active power; ·With reliable start-up and creep performances; ·Adopting hardware logic encrypted RF card as medium for data communication;·Alarm to reminding users to purchase the electricity when the energy surplus is less than alarm energy value;·Special circuit against tamper and fraud;·LCD or LED or digester display; ·Bidirectional active energy measurement; ·Switching-off or buzzer precaution; ·RS485 and infrared communication interface; ·Display of recycled information including accumulated energy value, surplus ,meter constant,meter number,etc.; ·With the protection from harmonic wave and high-frequency pulse interference; ·Two sets of step tariff system; ·Seven kinds of step tariff at most; ·Six step at most; ·Large relay capacity with low power consumption and high reliability; ·Presetting of load value,alrm energy value,maximum load, step tariff,etc.; ·Credit overflow limit; ·Alarming and switching off when overload; ·Data in meter can be kept for 10 years when there is no power; · Main Techical Parameters: Accuary class1.0,2.0Rated voltage220VBasic current(Ib)/ Max current(Imax)1.5(6)A,2.5(10)A,5(20)A,10(40)A,20(80)A2.5(15)A,5(30)A,10(50)A,10(60)A,20(100)ARated frequency50Hz,60HzNormal operating temperature-25°C 55°CLimit operating temperature-30°C 60°CStorage temperature-40°C 70°CRelative humidity≤85%Power consumptionVoltage Circuit<2WCurrent Circuit <5VAData storeDate store under no energy 10 yearsSize162mm×116mm×62mmWeightAbout 0.9KgService life>10 yearsMeter constant800/1600/3200/6400imp/kWhStart current0.004IbNormal operating voltage0.8Un 1.15UnLimit operating voltage0.7Un 1.2UnDegree of protectionIP54Service life of CPU Card100000 timesAccuracy of clock<0.5s/dayCommunication ProtocolDL/T645-1997 or DL/T645-2007