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It was the first fully automatic moving-block signalling system to be commercially implemented. SelTrac was originally developed in the 1970s by Standard Elektrik Lorenz (the "SEL" in the name) of Germany for the Krauss-Maffei Transurban , an automated guideway transit system proposed for the GO-Urban network in the Greater Toronto Area in Canada.
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 ...
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).
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When the SEL 32 systems were introduced, SEL created another operating system called MPX-32 which supported multiprocessing and multiple users. Later, in the early 1980s, SEL adopted the Unix operating system. As "Gould CSD" (Computer System Division) then introduced the UTX-32 Unix-based OS that included both BSD and System V characteristics ...
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