ABSTRACT
Electrical metering deals with two basic quantities: energy and power. The single stator consists of two electromagnets. One electromagnet is the potential coil connected between the two circuit conductors. The electromagnetic fields of the current coil and the potential coil interact to generate torque on the rotor of the meter. Blondel’s theorem of polyphase metering describes the measurement of power in a polyphase system made up of an arbitrary number of conductors. Electronic meters contain no moving mechanical parts—rotors, shafts, gears, bearings. The operation of an electronic meter is very different than that described in earlier sections for an electromechanical meter. Electronic circuitry samples the voltage and current waveforms during each electrical cycle and converts these samples to digital quantities. Multifunction or extended function refers to a meter that can measure reactive or apparent power in addition to real power. Metering pulses are signals generated in a meter for use outside the meter.
