. Electrical world. FIGS. I AND 2.—ALTERNATORS IN P.\RALLEL. current, the load being regulated by means of a regulating heat produced by these currents is kept low by the air currents,especially as the proceedings last only a short time. On account ofthe artificial load, the regulator of the engine has a position whichcorresponds to the load, so that the machine will take over part ofthe load of the other machine immediately. The faucault brake actsat the same time as a damper, diminishing the mechanical fluctua-tions. The author then discusses the various methods for determin-i
. Electrical world. FIGS. I AND 2.—ALTERNATORS IN P.\RALLEL. current, the load being regulated by means of a regulating heat produced by these currents is kept low by the air currents,especially as the proceedings last only a short time. On account ofthe artificial load, the regulator of the engine has a position whichcorresponds to the load, so that the machine will take over part ofthe load of the other machine immediately. The faucault brake actsat the same time as a damper, diminishing the mechanical fluctua-tions. The author then discusses the various methods for determin-ing the coefficient of speed variation. Electrical methods are the onlyaccurate ones and even these cannot be relied upon, when the coeffi-. FIGS. 3 AND 4.—ALTERNATORS IN PARALLEL. cient of speed variation is less than 1/200. Fig. 2 represents a methodof the General Electric Company. A cycle wheel is fixed on theshaft of the small direct-current generator. The rubber tire isbraced against the fly-wheel of the engine and the excitation of thisgenerator is such that its , corresponding to the mean equal and opposed to the pressure of a battery, S,. Between thearmature of the generator. A, and the battery, B^. is joined a Weston voltmeter with a low-reading scale. It will be evident that, if thefly-wheel rotated at a uniform speed, equal to the mean, the volt-meter would show no reading; but as the fly-wheel is rotating with avarying speed within a revolution, the voltmeter needle will oscillate,the amptitudes from the zero position being a measure of the varia-tion of speed. A modification of this method by Franke is shown inFig. 3. • The armature, A, and the indicator, /, are coupled to theengine, the ind
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
