Switchboards for power, light and railway service, direct and alternating current, high and low tension . e two machines. When such anarrangement is adopted it is common to provide a switchby means of which the ammeter may be connected witheach generator independently, when desired, so that thestrength of each current may be determined. While wehave shown two ammeters in Fig. 21 we have only pro-vided one voltmeter, and this is arranged to indicate thevoltage between the two busses i and 2. When a singlevoltmeter is provided, it is arranged so as to be con-nected with each generator independen
Switchboards for power, light and railway service, direct and alternating current, high and low tension . e two machines. When such anarrangement is adopted it is common to provide a switchby means of which the ammeter may be connected witheach generator independently, when desired, so that thestrength of each current may be determined. While wehave shown two ammeters in Fig. 21 we have only pro-vided one voltmeter, and this is arranged to indicate thevoltage between the two busses i and 2. When a singlevoltmeter is provided, it is arranged so as to be con-nected with each generator independently so as to be usedm adjusting the machines in the act of starting. Onlytwo distributing circuits are shown in this diagram, butit will be noticed that, in one, a circuit breaker is pro-vided as well as a switch. It is customary to provide cir-cuit breakers in the distributing circuits when there aredevices upon them that would be seriously injured by anexcessive current. 38 For two generators. Fig. 19 shows the simplest form of switchboard fortwo generators, as it is arranged for only one system of. Figure I<3 ^he Derry CMarl C<j. Switchboard in which the street connection is omitted. distributing circuits. In Fig. 20 a more complicated ar-rangement is shown in which two independent distributing 39 More elaborate arrangement. systems are provided for. It will be noticed that thisdiagram is simply an elaboration of Fig. 12, and that twodouble throw main switches, Si and S2, are providedinstead of one, but these are necessary on account of therebeing two generators. In all other respects the diagramsare identical. The main switches in Fig. 20 are shownin the position that connects the generators with the lowerset of busses, marked A. If either switch is thrown tothe opposite side it will connect its generator with the topbusses B. Both generators can be connected with thetop busses and either one can be connected with eitherset of busses, but the whole system cannot be ti
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
