Rating plate
A 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, 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, 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, since the exact power factor will be determined by the external factors;
- power factor is the nominal power factor for other ratings; usually PF = 0.8;
- insulation class for the primary coil. Typical value is F, although older generators might use class B;
- type of enclosure ;
- rated voltage can be either line to line or phase to neutral ;
- rated current is derived from the rated power and voltage: ;
- line frequency and rotational speed of the prime mover in RPM;
- connection.