International Library of Technology · Scranton, International Textbook Co. · leaf 106
. Fig. 45shows the connectionswhen the meter is usedon circuits where thepressure is not over500 volts. When thepressure is higher thanthis, small transform-ers t, t, Fig. 46, areused to step down thevoltage for the pres-sure coil of the record-ing wattmeter, and theconnections are asshown in the… … W= 1.732 X E X Cxf. (19.) Example.—A three-phase motor takes a current of 40 amperes froma 500-volt line. How many horsepower are supplied if the power factorof the motor is .80 ?Solution.—We have W= 1.732 X ExCxf= 1.732 X500 X40 X .80= 27,712. Hence, H. P. = **ft* = 37.1. Ans. § 14 ELECTRIC…
Electrical engineering
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