DDSY89单相电子式预付费电能表.doc

SINGLE PHASE FOUR MODULAR DIN RAIL ELECTRONIC METER WITH RS485 DDS353B Ⅰ. Standard The functions of the product meet all the technical requirements of single phase electronic meter in IEC 62052-11, EN50470-1/3 standard (static AC active power meter). The meter is intended to be installed in a Mechanical Environment ‘M1’, with Shock and Vibrations of low significance, as per 2004/22/EC Directive and should be installed in Electromagnetic Environment ‘E2’, as per 2004/22/EC Directive. Ⅱ. Functions and characteristics Active electricity measuring, without adjustment under long-term functioning. With RS485 communication, index in accordance with Modbus RTU, which focuses on convenient intelligent management conveniently (If without 485, there is no such function). Wide work temperature range: -25—+55(C Ⅲ.Technical specifications 1. Rated voltage: 230V 2. Rated current: 0,25-5(80)A 3. Rated frequency: 50Hz 4. Display mode：LCD 5+= 99999.99kWh 5. Impulse constant: 1600imp/kWh 6. Class of Accuracy: B 7. Start current: 0.4%Ib (class 1.0) 8. Creep: logical design of Anti-creep 9. Power consumption: ≤1W（when 220V 20A） Accuracy (see the form bellow) Load current Power factor COSФ Basic error% Class 0.5 Class 1 Class 2 0.05Ib 1.0 ±1.0 ±1.5 ±2.5 0.1Ib~Imax 1.0 ±0.5 ±1.0 ±2.0 0.1Ib 0.5(L) ±1.0 ±1.5 ±2.5 0.8(C) ±1.0 ±1.5 — 0.2Ib~Imax 0.5(L) ±0.5 ±1.0 ±2.0 0.8(C) ±0.5 ±1.0 — 10. Environment condition: standard work temperature -20—45(C limit work temperature -30—55(C relative humidity ≤85% 11. Outside dimensions: 115(78(65mm Ⅳ．Working principle See Fig.1.send simulate signal of sampling current and sampling voltage separately to special integrated circuit, after inner amortize and magnify to multiplicative part. And voltage signal multiply with current signal, through A/D transition to transfer simulate value to figure signal. Then, through frequency divide cir