Rating plate
Introduction Dalchonzie power station with continuous maximum rating (CMR) of 4 megawattsA '''rating plate''' on a machine carries information about its operational limits. The plate frequently contains the names of the machine and its manufacturer, so  the rating plate is often called a name plate (hence the term "nameplate capacity" for a generator), although many devices carry separate nameplates and rating plates.For an electric machine, the power rating is the number on its rating plate and corresponds to a maximum electric load it can carry. There is a distinction between the ''continuous rating'' (for generators, '''continuous maximum rating''' or '''CMR'''), at which the machine can be operational without a time limit and short-term rating that can only be used for a specified amount of time.
Generators A typical electrical generator rating plate contains the following parameters:* ''power rating'' is specified in terms of apparent power (KVA or MVA), since the exact power factor will be determined by the external factors;* ''power factor'' (PF) is the nominal power factor for other ratings; usually PF = 0.8;* ''insulation class'' (B, F, H) for the primary coil. Typical value is F, although older generators might use class B;* ''type of enclosure'' (IP code);* '''rated voltage''' can be either line to line ("line voltage") or phase to neutral ("phase voltage");* '''rated current''' is derived from the rated power and voltage: ;* ''line frequency'' (50 Hz or 60 Hz) and rotational speed of the prime mover in RPM;* ''connection'' (star or delta).
See also * Per-unit system
References
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