NDLI: Transactions section: Preprint of corresponding pages from the current annual transactions volume

Content Provider	IEEE Xplore Digital Library
Author	Curtis, Thomas E.
Copyright Year	1931
Abstract	This paper describes a new electrical control system with which a standard power-system governor may be made sensitive to system load as well as frequency. A proposed scheme of application is presented which is believed to permit electrical control of a standard governor instead of mechanical control, without any sacrifice of reliability. The frequency of a power system is governed by controlling the power input to the prime movers of the system. Consider, for example, a typical power system in which one hydraulically-driven synchronous generator is governing the system frequency. Since the remaining generating units are operating at constant loads, the power output of the governing unit must be regulated so that the unit will assume any variations of load on the system. Simultaneously, this unit is controlled to hold the system frequency at a constant value. Figure 1 is the schematic representation of a typical governing system of a hydro-electric generating unit. The power output of this unit is regulated by varying the opening of the needle valve to control the flow of water through the turbine This valve is operated by oil pressure through a control valve and piston, as shown in figure 2. The speed-sensitive element in this governing system is a centrifugal governor, driven from the turbine shaft, which operates the control valve by pivoting the beam about point P.
Starting Page	89
Ending Page	92
Page Count	4
File Size	1315097
File Format	PDF
ISSN	00959197
Volume Number	60
Issue Number	3
Language	English
Publisher	American Institute of Electrical Engineers
Publisher Date	1941-03-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency control Valves Solenoids Relays Turbines Load flow control
Content Type	Text
Resource Type	Article

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