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Cooper Industries was an American worldwide electrical products manufacturer headquartered in Houston, Texas. Founded in 1833, the company had seven operating divisions including Bussmann electrical and electronic fuses; Crouse-Hinds and CEAG explosion-proof electrical equipment; Halo and Metalux lighting fixtures; and Kyle and McGraw-Edison power systems products.
It had the motor division which made small and large electric motors and it had the transformer division where it manufactured small and medium power transformers plus liquid-immersed distribution transformers. The transformer division ended up as part of the Cooper Power Systems division.
It was created in 1957 through a merger of McGraw Electric and Thomas A. Edison, Inc., and was in turn acquired by Cooper Industries in 1985. Today, the McGraw-Edison brand is used on industrial, commercial, and institutional lighting products, and has been owned by the Pennsylvania Transformer Technologies Inc. since 1996.
In 1949 McGraw acquired the Line Material company of Milwaukee, which manufactured power line equipment. Line Material was based in Milwaukee and operated plants in several other cities. It had 1948 sales of $38,750,000 and net income of $3,108,000. [10] In 1952 McGraw Electric merged with the Pennsylvania Transformer Company. [11]
Audio transformers were originally designed to connect different telephone systems to one another while keeping their respective power supplies isolated, and are still commonly used to interconnect professional audio systems or system components, to eliminate buzz and hum. Such transformers typically have a 1:1 ratio between the primary and the ...
In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. . Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to t