Determination of Generator Speed and Retardation During Loss Measurements

This paper describes an instrument which was developed to make graphic records of generator revolutions and time as the generator slows down under the action of its losses during retardation tests. The construction of speedtime curves from the records thus obtained is outlined. The principle of numerical differentiation is discussed and its application to the determination of the slope of the speedtime curve is pointed out. A complete example illustrating the application of this principle is included in the paper.