TransactionsPublished under the care of the General Secretary and the Treasurer . Fig. 9.— 3500-kw alternator. 1 — 533 BEHREND: TESTING GENERATORS. 533 Determination of the Eegulation of Alternators. Fig. 5 represents the regulation curves on low power-factor ob-tained by first running a synchronous motor from the generator andsecondly by circulating power within the machine itself. The agree-ment between the two methods is very satisfactory. Numerous ex-periments have been made on machines designed by the author tocheck the new method against the synchronous motor generatortests, and the resu
TransactionsPublished under the care of the General Secretary and the Treasurer . Fig. 9.— 3500-kw alternator. 1 — 533 BEHREND: TESTING GENERATORS. 533 Determination of the Eegulation of Alternators. Fig. 5 represents the regulation curves on low power-factor ob-tained by first running a synchronous motor from the generator andsecondly by circulating power within the machine itself. The agree-ment between the two methods is very satisfactory. Numerous ex-periments have been made on machines designed by the author tocheck the new method against the synchronous motor generatortests, and the results have shown a very close agreement. Fig. 6 shows the regulation curves of a 3000-kw, 26-pole,50-cycle generator, obtained in this manner. Fig. 8 showsa picture of this machine. Fig. 7 shows the regulatio^. Fig. 5.— Comparison between regulatiox curves obtaixed by syn-cheonous-motob-generator test and by the authors method. curves of a 3500-kw, 40-pole, 25-cycle generator supplyingpower to the Worlds Fair at St. Louis. Fig. 9 shows a picture ofthis machine. Fig. 10 shows the regulation curves of a 3200-kw,fly-wheel type, 96-pole, 60-cycle generator. The terminal voltagecorresponding to the conditions under which the machine is operat-ing in the test can be determined, either by measuring the volts ona set of coils per pole multiplied by the total number of coils; or,by adding to the excitation on the motor fields the excitation re-quired to drive the armature current through the armature methods have invariably given the same results. 534 BEHREND: TESTING GEyEliATORS.
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