Case Study 180-1039 May 21, 2007 New Publication ©2007 S&C ELECTRIC COMPANY Specialists in Electric Power Switching and Protection Big Batteries Provide Big Results Background American Electric Power’s Chemical Substation in Charleston, West Virginia is the site of North America’s first megawatt-class sodium-sulfur battery for shaving load peaks. The 20-MVA, 138/15-kV transformer in this substation had been operated very close to its limit d

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