Author

Rasik Desai

Document Type

Thesis - Open Access

Award Date

1972

Degree Name

Master of Science (MS)

Department

Electrical Engineering

Abstract

The work done in this paper was motivated by a project that the United States Bureau of Reclamation has initiated to implement certain communication and control requirements. The Colorado River storage project, under the Bureau of Reclamation, has a central power operations center at Montrose, Colorado, to serve as a computing and dispatch center for the surrounding power plants and substations. The requirement was to provide supervisory control facilities at the Montrose Center to control the encompassing substatior1s and power plants. Specifically, the project was to furnish the dispatch center at Montrose with a stored program, programmable master station, which will have the capability of performing control, indication, alarm, and data transmission to and from the various power plants and substations. This paper mainly deals with the last aspect of this project, namely, data transmission to and from other points. The different data to be transmitted to and from the dispatch center include: 1. Voltage level, derived from power system potential transformers. 2. Current level, derived from power system current transformers. 3. Spillway gate position indication, derived from the rotation of an intermediate gate hoist shaft which will drive a shaft to digital encoder, furnishing a digitized input to the supervisory control equipment. 4. Reservoir level, derived from a water-surface detector which will drive a shaft-to-digital encoder. 5. Governor gate limit position, derived from the rotation of the governor gate limit mechanism which will drive a shaft-to-digital encoder. 6. Outlet gate position indication, working as described above. 7. Tailwater level, derived from a float operated type gate which will drive a shaft-to-digital encoder. 8. Raise-lower command signals to the following. a. Power plant governing wicket gate limit. b. Power plant generator speed changer limit. c. Power plant generator voltage level. 9. Trip-close command signals to circuit breaker. 10. load and frequency control system ON-OFF commands. It is essential that the command signals received at the remotely controlled stations have the same form as when they were transmitted. In other words, it is essential that the message received at a receiving station should be error-free, or if it has errors, they should be corrected before it is fed to the devices concerned. The problem thus originated out of the necessity of having a digital data transmission system, that will be reliable, efficient, and at the same time, economically feasible.

Library of Congress Subject Headings

Error-correcting codes (Information theory)
Information theory

Format

application/pdf

Number of Pages

102

Publisher

South Dakota State University

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