Journal of electricity, power, and gas . transformers and the lightning arresters for the 13,200volt outgoing feeders. The ground floor contains thetwo 1000 kw. lowering transformers, each of whichis set in a separate fireproof compartment. A Kin-near rolling door is provided for the front of eachcompartment; transformers rest on rails and for re-pairs may be slid on to a four-wheel truck that runson a depressed track serving both is provided for a third transformer this spacebeing at present occupied by oil storage tanks and anoil filtering and drying outfit. The tanks, dri
Journal of electricity, power, and gas . transformers and the lightning arresters for the 13,200volt outgoing feeders. The ground floor contains thetwo 1000 kw. lowering transformers, each of whichis set in a separate fireproof compartment. A Kin-near rolling door is provided for the front of eachcompartment; transformers rest on rails and for re-pairs may be slid on to a four-wheel truck that runson a depressed track serving both is provided for a third transformer this spacebeing at present occupied by oil storage tanks and anoil filtering and drying outfit. The tanks, drier andtransformers are so piped that oil can be removed JOURNAL OF ELECTRICITY, POWER AND GAS 400 from either transformer, filtered or dried, and pumpedback without interfering with the operation of thetransformers. All 13,200 volt wiring, disconnecting and oilswitches and current and potential transformers are inbus compartments, the phases of each circuit beingseparated from one another by barriers of transite and [Vol. XXXII—No. 19. Single Track Curve Construction With 13,200 VoltTransmission Lines. the various circuits by concrete barriers. This con-struction gives an efficient but inexpensive bus struc-ture. Overhead Construction. The details of the material used in the construc-tion of the overhead, feeder and trolley system weredeveloped by the Southern Pacific Company on itslines on the east side of San Francisco Bay, some slightmodifications being made to meet local conditions. The standard pole spacing on tangents, andcurves up to 2 degrees, is 150 ft.; on curves from 2 to4 deg., 120 ft.; on curves from 4 to 6 deg., 90 ft.; andon all curves over 6 deg., 60 ft. On future construc-tion these spacings, on account of a new method usedin pulling off curves, will be so modified as to elim-inate the 60 ft. spans. In arriving at the proper ten-sion at which to string the messenger wire, due con-sideration was given to the ice and sleet loads thatmight obtain, and under maxi
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