. Development and electrical distribution of water power . mer cells are of solid concrete with a fire-door opening onto the gallery in front. The fire-doors are heldopen by fusible links to allow the doors to slide shut in case of transformers are each of 900 The primary voltage is2,300 and the secondary voltage 50,000. They are oiland watercooled, the water being piped from the forebay. The oil can bedrained from the transformers by opening a valve which is accessiblein the wheel gallery behind the transformer cells; thus, in case offire in a transformer case, the oil can be dr
. Development and electrical distribution of water power . mer cells are of solid concrete with a fire-door opening onto the gallery in front. The fire-doors are heldopen by fusible links to allow the doors to slide shut in case of transformers are each of 900 The primary voltage is2,300 and the secondary voltage 50,000. They are oiland watercooled, the water being piped from the forebay. The oil can bedrained from the transformers by opening a valve which is accessiblein the wheel gallery behind the transformer cells; thus, in case offire in a transformer case, the oil can be drained off without enter-ing the cell, and the cell can be kept closed. As shown in Fig. 119, TAYLORS FALLS PLANT 239 each transformer is mounted on a four-wheeled truck and there aretracks converging toward the door so that any one of the transform-ers can be run onto the gallery, where it can be picked up by thetravelling crane. On the top floor of the building is an electrically heated oil-treating tank 4 feet in diameter X 8 feet long, in which enough. Fig. 119.—Transformer Cell. oil can be treated for one transformer. It contains electric heatingcoils requiring a maximum of 45 When the oil is heatedwith these coils a motor-operated vacuum pump 8 inches in diam-eter X 6 inches stroke pumps out the steam that may be formedfrom any moisture in the oil. The power station is piped fortransformer and switch oil. Switches and Wiring.—Each generator is connected directlyto its bank of step-up transformers without the intervention of anyoil switch, although there is a set of disconnecting switches in theleads of each generator before they come to the current and poten- 240 DEVELOPMENT AND DISTRIBUTION OF WATER POWER tial transformers. In ordinary operation generators are connectedin parallel by means of the oil switches on the 50,000-volt side ofthe transformer, thus putting them in parallel on the 50,000-volt bus-bars. The 50,000-volt bus-bars are therefore the usualoperat
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