. The Street railway journal . ans-formers, also on the mezzanine floor, from which connec-tions are taken to the power measuring instruments in theoperating room. The main connections finally terminateupon a set of copper bus-bars in the transformer room,which are run upon porcelain insulators mounted onwooden cross-arms and placed at a convenient height di-rectly over the line of transformers. The 60,000-volt three-phase current is rendered available 1for single-phase distribution by means of three transform- fers of the Westinghouse oil-insulated water-cooled type,each of 750 kilowatts capa
. The Street railway journal . ans-formers, also on the mezzanine floor, from which connec-tions are taken to the power measuring instruments in theoperating room. The main connections finally terminateupon a set of copper bus-bars in the transformer room,which are run upon porcelain insulators mounted onwooden cross-arms and placed at a convenient height di-rectly over the line of transformers. The 60,000-volt three-phase current is rendered available 1for single-phase distribution by means of three transform- fers of the Westinghouse oil-insulated water-cooled type,each of 750 kilowatts capacity. For the present installation,two transformers only are used at one time, the third beinga spare. The high-tension connections are such that incase of one transformer failing while in service, its con-nections can quickly be taken off the bus-bars, and put onthe spare transformers. The transformer windings arefitted with taps enabling the three-phase to two-phase Scottconnection to be used. The low-tension windings can be. MAIN TRANSFORMER ROOM IN AVON SUB-STATION so connected that either 11,000 volts or 22,000 volts can beobtained, so that in case it should ever be desired to trans-mit railway current for an extension of 40 or 50 miles, toanother sub-station it could readily be done without addingtransformers to this equipment. The low-tension windings also have six taps, enabling relatively small variations inthe secondary voltage, if the same should be necessary tosuit operating conditions in the trolley line. One end of each low-tension winding is directly groundedto the boiler iron case, which in turn is, by means of a stranded copper cable, directly connected to the trackreturn circuit. The transformer cases are made of boiler iron, and set on
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
