Ferroresonance & the Snettisham Hydroelectric Project

by Bob Luck, US Army Corps of Engineers, Portland, United States,
Rick Vanatta, US Army Corps of Engineers, Portland, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


Key system features of the Snettisham power plant in Alaska will be highlighted along with a discussion of the operational problems encountered due to a ferroresonant condition. The project is a three-generator unit subterranean powerhouse with an outdoor switchyard. Power is developed by tapping the bottoms of two glacial fed mountain lakes. The 138-kV transmission system consists of 42 miles of overhead line and 3 miles of submarine cable. At the receiving end at Juneau the line is connected to autotransformers. The results of the computer studies conducted to investigate these problems is summarized. The proposed solution and design details for system improvements are described.

Subject Headings: Cables | Hydro power | Electric power | Electrical systems | Electrical equipment | Mountains | Lakes | Power transmission lines | Alaska | United States

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