Switchboards for power, light and railway service, direct and alternating current, high and low tension . nttraversing its primary coil may vary with the e. m. f. ofthe alternator; but as the ammeter is to indicate changesin the strength of the alternator current, its primary mustbe connected in series with the main line. The voltageof the current furnished by the exciter E is regulatedby means of a rheostat R which, as will be seen, is con-nected in the field circuit of this machine. Another rheo-stat R is provided in the main circuit of E, by means ofwhich the field exciting current of A can
Switchboards for power, light and railway service, direct and alternating current, high and low tension . nttraversing its primary coil may vary with the e. m. f. ofthe alternator; but as the ammeter is to indicate changesin the strength of the alternator current, its primary mustbe connected in series with the main line. The voltageof the current furnished by the exciter E is regulatedby means of a rheostat R which, as will be seen, is con-nected in the field circuit of this machine. Another rheo-stat R is provided in the main circuit of E, by means ofwhich the field exciting current of A can be means of the switch F the circuit through the fieldcoils of A can be opened or closed. As can be seen, thestrength of the field magnetizing current of A can beregulated by both the rheostats, as R varies the currentby changing the resistance in the circuit, and R variesit by changing the voltage. When economy is practicedone of the rheostats can be dispensed with, generally fuses C C can be replaced by circuit breakers, orboth devices can be used. The niain switch D can be a 109.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
