. The Street railway journal . working at 80 periodsinto a three-phase machine at 25periods. The armature coils are for-mer wound, thoroughly insulated be-fore fixing in the core slots. The wind-ings were tested with 12,000 volts,between the separate phases and toframe. The steel magnet poles arebolted to a steel shaft, which is furtherbolted to the rim of the cast-iron fly-wheel, which, together with the mag-net, weighs 26 tons. The efficiency ofthe alternator is 95 per cent, while theexciting energy is only 1? per cent, al-though the regulation is 95 per centfrom no load to full inductive lo
. The Street railway journal . working at 80 periodsinto a three-phase machine at 25periods. The armature coils are for-mer wound, thoroughly insulated be-fore fixing in the core slots. The wind-ings were tested with 12,000 volts,between the separate phases and toframe. The steel magnet poles arebolted to a steel shaft, which is furtherbolted to the rim of the cast-iron fly-wheel, which, together with the mag-net, weighs 26 tons. The efficiency ofthe alternator is 95 per cent, while theexciting energy is only 1? per cent, al-though the regulation is 95 per centfrom no load to full inductive tested temperature rise was lessthan 25 degs. C. after eight hoursworking at full load. In a suitable room adjoining the engine room are thevarious switchboards for controlling the current, both forthe tramways and the lighting. The switchboard for the ply, having been manufactured by the electric departmentof the Halifax Corporation in the workshops adjoining theelectricity works. The lighting network is fed from sev-. FIG. 7.—THREE-PHASE SWITCHBOARD IN POWER STATION eral sub-stations, and the mains are laid partly on the solidsystem run in with bitumen, and partly armoured cablelaid direct in the ground; some portion is also pulled into September 6, 1902.] STREET RAILWAY JOURNAL. 297 conduits. The cable is chiefly Callencler and British In-sulated Wire Companys makes. The general construction of the Ferranti board, whichis of the cellular type, consists of a set of 2-in. slates fixedin a horizontal position and solidly grouted into the these slates vertical divisions are provided to di-vide the whole framework into a set of pigeon-hole re-cesses. Each of these recesses contains individual appar-atus, the whole being assembled in such a way that partsof opposite potential are absolutely divided from one an-other by insulating material which serves not only to pre-vent the chances of fire and consequent damage to thegear, but also renders accidental contac
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
