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He sold his first product, the SEL-21, to Otter Tail Power Company in Fergus Falls, Minnesota in 1984. Otter Tail initially used the SEL-21 for its fault location and event recording functions. In 1985, SEL built its first building and employed eleven people. In 2009, SEL became 100% employee-owned under an employee stock ownership plan (ESOP).
SEL products and technologies are used in virtually every substation in North America and are in operation in 164 countries. [ 1 ] Recognized as a pioneer in digital protection, Schweitzer has been credited with “revolutionizing the performance of electric power systems with computer-based protection and control equipment, and making a major ...
It is poor engineering to specify a CR instead of an R simply on the theory of enforcing good workmanship. CR is for critical features whose performance truly requires near-perfect geometry. Like most such characteristics, its presence increases the price of the part, because it raises the costs of manufacturing and quality assurance. CRES
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Single-event upsets were first described during above-ground nuclear testing, from 1954 to 1957, when many anomalies were observed in electronic monitoring equipment.. Further problems were observed in space electronics during the 1960s, although it was difficult to separate soft failures from other forms of interfe
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A telluric current (from Latin tellūs 'earth'), or Earth current, [1] is an electric current that flows underground or through the sea, resulting from natural and human-induced causes. These currents have extremely low frequency and traverse large areas near or at Earth 's surface.
A new joint investigation by American Banker and the San Antonio Current details the organization’s many problems and how the bank and insurer is currently “navigating a minefield of its own ...