An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 390
are such thatat any instant their sum is zero. To save wire electricalengineers have inventedtwo methods of connectingdevices of any sort to a three-phase circuit, so as to haveonly three line wires insteadof six. They are (1) thestar or Y-connection shownin figure 245 (I), and (2) the delta or… … Fig. 244.— Curves of currents in a three-phase machine.
Electricity · Magnetism
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