Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 293
r E.M.F. than the gene- T 274 ELECTRIC TRANSMISSION OF ENERGY. rator, as already pointed out. If we work the generatorat or slightly below the knee of the characteristic weinsure the safety of the plant in the event of a shortcircuit, whilst to insure a margin of power we must workthe motor well… … excitation of the motor (corresponding to 1,200, 1,300,and 1,350 volts), we can for each case construct thepower curves and see at a glance what margin of powerwe have. The construction must be made as in Fig. 93,and corrected by reference to Fig. 94, various values forJSi and K2 being tentatively…
Electric power production
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