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Extra info for Smart Metering Design and Applications
Sample text
Energy measurement chip designers provide their own reference power supply schematics. 15 shows the power supply schematic which is used in STPM10 energy meter reference design [18]. However the power output from these circuits may not be sufficient to drive other hardware components in the smart meter. Therefore the required power to drive the energy chip, MCU, LCD, battery charger and communication unit should be taken into consideration before designing a power supply. 16 shows the block diagram of a typical power supply used in smart meters.
They are not influenced by external magnets or orientation of the meter itself. Therefore digital meters are more reliable and tamperproof than electromechanical meters [2]. A single phase electronic energy meter used by a utility company is shown in Fig. 5. 7 Smart Meters Smart meters are different from electronic meters because of their additional functionalities and features. Apart from electricity measurements and automatic meter reading (AMR), they allow two-way communication between the meter and the base station.
Maximum demand is the highest average demand recorded over specified time intervals. 5 Maximum Demand Meters 25 The demand intervalðT Þ may vary power utility to other. Typical values for T are 10, 15, and 20 min. The maximum demand is the highest value among all the average demands recorded over the month. 6 Electronic Meters Electronic meters are capable of measuring electricity usage with digital technology. At the same time they can measure the other electrical parameters such as phase voltages, phase currents, frequency, power factor, active power, reactive power, apparent power, maximum demand, and power quality measurements.