Short-circuit characteristics and load performance of inductor-type alternators
作者:
A.Mandl,
期刊:
Journal of the Institution of Electrical Engineers - Part II: Power Engineering
(IET Available online 1947)
卷期:
Volume 94,
issue 38
页码: 102-117
年代: 1947
DOI:10.1049/ji-2.1947.0047
出版商: IEE
数据来源: IET
摘要:
The paper develops a graphical method of determining the short-circuit current of an inductor alternator, taking into account the effect of a damping circuit which prevents oscillations of the total flux. It is shown that the short-circuit current depends mainly on the important ratio of maximum to minimum flux and on the leakage. The equivalent circuit for the inductor alternator is determined from the open-circuit voltage and short-circuit current. The ratio of these values varies owing to saturation effects, but can be taken as constant for a given excitation and independent of the load circuit.Compensation of the internal inductive reactance by series condensers for an alternator with constant and variable speed is considered, and the transient- and steady-voltage changes are investigated. The reason for the voltage drop of the fully compensated machine being many times greater than the resistive drop is given. The effect on the speed/torque characteristic of series-condenser compensation is shown.The paper explains that the damping winding increases the effective excitation for a load circuit having a lagging power factor and reduces for a leading power factor.An unusual type of instability arising when paralleling series-compensated alternators is investigated, and a remedy for this phenomenon is given.
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