NDLI: Exciter Instability

Content Provider	IEEE Xplore Digital Library
Author	Doherty, R. E.
Copyright Year	1884
Abstract	1. The form of equation for exciter voltage and current is the same as the well known equation for the electric circuit containing resistance, inductance and capacity. Hence the same form of oscillations and transients are involved, the only difference being that in the present case the duration of the transients is much longer. 2. Instability may occur when the exciter is operating on the straight part of the saturation curve, if in addition some combination of the following conditions exists: (a) very low residual voltage-say 1 per cent or so. (b) a relatively large voltage drop in the armature. (c) large inductance in the load circuit, as always exists in the alternator field. (d) alternator transient of greater duration than the exciter transient. (e) excessive series field strength. 3. Instability may be classed, for convenience, under two headings: (a) voltage ``creeping,'' and (b) ``double-energy'' transients. The former may be caused by slight speed transients of the exciter; or by temperature transients causing corresponding resistance transients in the shunt field circuit; or by hysteresis effects which may be caused by small undulations in the exciter voltage. The ``double energy'' transients, such as oscillations and reversal of excitation, may be initiated by a shock, such as a short circuit on the alternator, or sudden, relatively large change circuit in constants, for instance a large change in resistance in the shunt field circuit. 4. The exciter can be stabilized against voltage ``creeping,'' (a) by special design to increase the angle ¿ Fig.
Starting Page	767
Ending Page	780
Page Count	14
File Size	2701666
File Format	PDF
ISSN	00963860
Volume Number	XLI
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1922-01-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Alternators Differential equations Saturation magnetization Manufacturing Character generation Regulators Circuit stability Magnetic circuits
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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