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Single-Phase Static Prepayment Watt-Hour Meter
General introduction:DDSY200-B single-phase Static prepayment watt-hour meter products are provided with built-in SAM module (a minitype CPU for encryption and security certification to guarantee is the meter is high-security of the meter). The products adopt special electric energy conversion chips ADE 7755 to carry out electric energy sampling. Then through a special microcomputer, the electric energy is processed and transferred into watt degree. By adopting the intellective CPU card, a secret password method comes into being. With the advantage of high security, this method is a DES encryption method generally used in the world and has passed He certification of the People`s Bank of China. CPU card can perform a two-way transmission of the electric quantity purchased and consumed between the electric energy meter and the electricity selling management system. Thus, the products can achieve the functions of electric energy measurement and electric charge prepayment.Main application places:The products are applied to the national energy supply system where the encryption demand is very high, and to measure the urban residents` power use.Main problems solved and advantages:This product can solve the same problems as the above DDSY200-A products can do. Moreover, by adopting financial-level CPU card, this product has improved in security and privacy. It is qualified for bank issuing the Co-branded card which lays a firm foundation for multipurpose with one card, and at the same time, can expand electronic wallet function.Main performance index: (completely meet the requirements of standard GB/T18460.3-2001):1) Accuracy: 1.0 class, 2.0 class, reference voltage (Un) 220V2) Basic current (Ib): 5A, 10A, and 20A3) Overloading multiple: 4 multiples4) Reference frequency: 50Hz5) Operation voltage range: 70% Un ~ 120% Un6) Limited operation temperature range: -25 ~ +55oC7) Humidity: annual average humidity
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