Switchboards for power, light and railway service, direct and alternating current, high and low tension . ttomterminals of the generator are connected with the twoleft-side blades of D, and this circuit runs to the terminalsL L, one side passing through ammeter Am. As willbe noticed, two ammeters are provided, one for eachcircuit, but there is only one voltmeter V, and this isarranged so as to be connected with either circuit bymeans of the double throw switch S, which connects theprimary of H with either one of the circuits, accordingto the side with which it is closed. The operation of theex
Switchboards for power, light and railway service, direct and alternating current, high and low tension . ttomterminals of the generator are connected with the twoleft-side blades of D, and this circuit runs to the terminalsL L, one side passing through ammeter Am. As willbe noticed, two ammeters are provided, one for eachcircuit, but there is only one voltmeter V, and this isarranged so as to be connected with either circuit bymeans of the double throw switch S, which connects theprimary of H with either one of the circuits, accordingto the side with which it is closed. The operation of theexciter, and the rheostats R R is the same as in Fig. ground detector G is connected with the centercontacts of switch 5^ so that by turning this switch inboth directions the two circuits can be connected with theground detector, one at a time. When it is desired tohave the two circuits permanently connected with grounddetectors, two of these instruments are used, each onebeing connected with one of the circuits in the mannershown in Fig. 57. Fig. 59 shows the switchboard connections for one III. Tht fJeri-u Cullanl Figure 59Switchboard for three phase generator. Three phase Switchboards three-phase generator. As in the two preceding dia-grams, A is the generator, E the exciter, D the mainswitch, R R the regulating rheostats, H a voltmetertransformer. Am the ammeter, J^ the voltmeter, G Gground detectors, and C C C fuses in the main lines. Itwill be noticed here that there is only one ammeter, andthis is permanently connected in one of the main voltmeter is also permanently connected with twoof the main lines. In a three-phase system this arrange-ment is possible, because the currents flowing in the threelines are of the same strength, and the voltage betweenthe lines is the same, hence, with two instruments con-nected as shown, the condition of the current and e. m. the three lines is properly indicated. These three diagrams show the switchboards arran
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
