. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . is represented the conditions at the short-circuit, and it willbe seen that the long sides of the voltage triangle have closed in will also be observed that the two star voltages, OB and OC, are in again to a, if the circuit has no inductance, the current whichflows into the short-circuit will be in phase with the voltage BC, as is shownby the vectors 7b and 7c. If such a condit
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . is represented the conditions at the short-circuit, and it willbe seen that the long sides of the voltage triangle have closed in will also be observed that the two star voltages, OB and OC, are in again to a, if the circuit has no inductance, the current whichflows into the short-circuit will be in phase with the voltage BC, as is shownby the vectors 7b and 7c. If such a condition were possible, none of therelays at the short circuit could operate, because the power factor is , however, there is always inductance in the circuit, the current will SYSTEM OPERATION AND ECONOMICS 265 lag somewhat, as shown by the vectors Ib and 7c. The result of this is tocause one of the relays at the short-circuit to operate forwards and the otherone to operate backwards. Fig. 148 shows the effect of an inductive loadon the system. The short-circuit currents are shown by single prime vec-tors, and resultants of the short-circuit currents and load currents by double.
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