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Scott-T transformer
A Scott-T transformer〔 (also called a Scott connection) is a type of circuit used to derive two-phase electric power (2-φ, 90-degree phase rotation) from a three-phase (3-φ, 120-degree phase rotation) source, or vice versa. The Scott connection evenly distributes a balanced load between the phases of the source. The Scott three-phase transformer was invented by a Westinghouse engineer Charles F. Scott in the late 1890s to bypass Thomas Edison's more expensive rotary converter and thereby permit two-phase generator plants to drive Nikola Tesla's three-phase motors.〔Harold C. Passer, ''The Electrical Manufacturers, 1875-1900'', Harvard, 1953, p. 315.〕
==Interconnection==
At this time two-phase motor loads also existed and the Scott connection allowed connecting them to newer three-phase supplies with the currents equal on the three phases.〔(【引用サイトリンク】 title=All About Circuits )〕 This was valuable for getting equal voltage drop and thus feasible regulation of the voltage from the electric generator (the phases cannot be varied separately in a three-phase machine). Nikola Tesla's original polyphase power system was based on simple to build two-phase four-wire components. However, as transmission distances increased, the more transmission line efficient three-phase system became more common. (Three phase power can be transmitted with only three wires, where the two-phase power systems required four wires, two per phase.) Both 2-φ and 3-φ components coexisted for a number of years and the Scott-T transformer connection allowed them to be interconnected.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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