. The Street railway journal . for the Johann-esburg municipality. Two of these are for 1350 kw 3300volts, and run at 100 r. p. m., and two are for 675 kw 3300volts, and run at 125 r. p. m. The company recently invited anumber of technical journalist* to inspect the new machinesat the companys works at Stafford, and during the visit theaccompanying notes were obtained: These alternators are designed for direct coupling to gasengines, to the specification of Messrs. Mordey & Dawbarn,and had to fulfill the most stringent guarantees. The tem-perature rise was guaranteed not to exceed 50 degrees F
. The Street railway journal . for the Johann-esburg municipality. Two of these are for 1350 kw 3300volts, and run at 100 r. p. m., and two are for 675 kw 3300volts, and run at 125 r. p. m. The company recently invited anumber of technical journalist* to inspect the new machinesat the companys works at Stafford, and during the visit theaccompanying notes were obtained: These alternators are designed for direct coupling to gasengines, to the specification of Messrs. Mordey & Dawbarn,and had to fulfill the most stringent guarantees. The tem-perature rise was guaranteed not to exceed 50 degrees F. inany part, after running for 12 hours at full load, and this tem-perature rise was not exceeded on test. The size of themachines was determined principally by the low excitationloss and the small rise of voltage on throwing off the load re-cjuired by the specification. The 675-kw sets, which are notshown, have an excitation loss of only per cent of the out-put. When running at full load on a .75 power factor the ^.. 1350-KW TWO-PHASE ALTERNATOR FOR JOHANNESBURG,SOUTH AFRICA rise of voltage on throwing off the full non-inductive load isonly 4J/2 per cent. Similar results have been obtained on the1350-kw sets. The stator frame is of cast iron and combines great stiff-ness with minimum weight. It is efficiently cooled by the cur-rent of air set up l)y the rotor, which escapes through theholes in the side protecting flanges and the shell of the frame is cast in four pieces, which are held together byconcealed bolts. The stator plates are firmly clamped bymeans of insulated bolts between two cast steel angle plates,which are fixed to the stator frame by means of bolts and ad-justable sleeve nuts, making it unnecessary to machine the in-side of the stator frame. The core is built up of laminatedstampings, insulated on both sides; the slots are open withgrooves to receive wooden keys to hold the former woundstator coils firmly in place. This construction allows the co
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
