[Electric engineering.] . adlining and e, e are glass rods for separating the plates; m, n arethe heavy copper conductors leading from the battery. Thespace occupied by a battery for a given output will dependon the way in which the cells are arranged, i. e., whether inone or two tiers. Generally, however, 1,000 kilowatt-hourscan be stored per 100 square yards of space. The numberof cells required in an installation will depend on the volt-age to be supplied. In large central stations operating onthe three-wire 110-220-volt system, about 80 cells are used oneach side of the circuit, though the
[Electric engineering.] . adlining and e, e are glass rods for separating the plates; m, n arethe heavy copper conductors leading from the battery. Thespace occupied by a battery for a given output will dependon the way in which the cells are arranged, i. e., whether inone or two tiers. Generally, however, 1,000 kilowatt-hourscan be stored per 100 square yards of space. The numberof cells required in an installation will depend on the volt-age to be supplied. In large central stations operating onthe three-wire 110-220-volt system, about 80 cells are used oneach side of the circuit, though the exact number of cellsdepends considerably on the range of voltage required tomeet special conditions. 64. Regulation of Batteries.—In order to fully chargethe cells, it is necessary to have a voltage somewhat higherthan that on which the system is ordinarily run. Of course,this might be obtained by running the generators at a highvoltage, but in most cases this is not practicable, because the 74 ELECTRIC LIGHTING. §17. § 17 ELECTRIC LIGHTING. 75 machines are generally used to supply current for lightingat the same time that they are charging the cells. In order,then, to raise the voltage on the battery, a booster isused when charging is going on. In lighting work, thebooster is not generally used for regulating purposes, butsimply to add enough pressure to the dynamos to enablethem to charge the batteries. In railway work, where theload fluctuates very rapidly, the booster is so constructed asto make the battery discharge when the load is heavy andcharge up when it is light. In lighting plants, the booster isusually shunt-wound or compound-wound and is driven by amotor. Fig. 71 shows one scheme of connections. Only theessential parts are here shown, so as to illustrate the principlesinvolved without confusing the diagram with the variousinstruments and switches. For this reason, also, a simpletwo-wire system is illustrated. G is the generator supply-ing current to the lamp
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