After almost 25 years of service, the generator and transformer protection systems at the hydropower plant of a western U.S. dam and reservoir were upgraded, including the replacement of electromechanical relays with microprocessor-based relays from Schweitzer Engineering Laboratories Inc. (SEL). The dam is an earth-and-rock-fill structure, more than 600 feet high and 1,500 feet wide at the crest. Located above ground at the dam site, the power plant houses two 150 MW turbine hydrogenerators. The power generated at this peaking plant supports the requirements of the nearby area, with the remaining energy marketed through the grid to customers outside the area.
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