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An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes.
MDI is often available as a built-in feature of three phase energy meters. Maximum demand is calculated as: Maximum Demand(KW)= Maximum Energy Recorded(KWh) ⁄ Time(hours) References
* Note: two versions: one contained a 16-cylinder 7HDL, co-developed by GE and the German firm Deutz-MWM, rated at 6000 HP; the other a 16-cylinder 7FDL rated at 4390 HP. The units equipped with the 7FDL were a sub-version AC6000 "Convertible" and were produced to get the type into operation while the 7HDL was developed.
Also in use are three phase meters that are not Blondel compliant, such as forms 14S and 15S, but they can be easily replaced by modern meters and can be considered obsolete. A form 2S watt-hour meter used for single phase 120-240 volt, 3 wire systems. It is a single element energy meter. [3]
A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]
The first mass-produced kilowatt-hour meter (electricity meter), based on Hungarian Ottó Bláthy's patent and named after him, was presented by the Ganz Works at the Frankfurt Fair in the autumn of 1889, and the company was marketing the first induction kilowatt-hour meter by the end of the year. These were the first alternating-current ...