With the growing industrial demand for electricity in the social life of agricultural, commercial and residential, people have become increasingly frequent trading of electricity, energy trading power meter to measure the amount of measuring instruments, its high technical demands, they require accurate and more for stability, and to ensure long-term reliability. Shanghai as the country's first use of power and energy metering earliest metropolis, use and management of energy meters has always been a national leader.
In 1880 the American Thomas Edison made the principle by electrolytic DC power table (ie security plan). Self-discovery and application in 1885 to the development of the alternating current meter put forward new requirements, AC power meter since emerged. Italian physicist Vladimir Academy Rees (Ferraris) proposed using the principle of the rotating magnetic field to measure the electrical energy in 1888, that is, in the role of a rotatable conductor space and two with the same frequency but different phases of an alternating magnetic field, conductor You will be able to rotate. Thus, AC induction meter, also known as FERRARI table. At that time, the United States Electrotechnical school teachers also use the same principle to create a model of induction meter. These theories and models are AC power meter prototype of germination.
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