. The Street railway journal . be operated only with thecurrent off. They are mounted on heavy insulators with marble January 30, 1904.] STREET RAILWAY JOURNAL. harriers around them. The lightning arresters are of the West-inghouse low-equivalent type with large condensers. They areplaced above and back of the high-tension switches, just lowenough to give ample space between them and the overheadcrane. The condensers are set on the engine room floor backof the high-tension board. To permit the engine-driven gen-erators, which are over-compounded, to work in parallel withthe rotaries when it is
. The Street railway journal . be operated only with thecurrent off. They are mounted on heavy insulators with marble January 30, 1904.] STREET RAILWAY JOURNAL. harriers around them. The lightning arresters are of the West-inghouse low-equivalent type with large condensers. They areplaced above and back of the high-tension switches, just lowenough to give ample space between them and the overheadcrane. The condensers are set on the engine room floor backof the high-tension board. To permit the engine-driven gen-erators, which are over-compounded, to work in parallel withthe rotaries when it is desired to deliver direct current from thelatter, kicking coils are put in series with the alternating-cur-rent leads of the rotaries. By this provision current is laggedsufficiently so that with an over-excited field on the rotaries thealternating-current voltage will be, boosted by the series turnson the rotary fields so that the resulting direct-current voltageon them will be the same as that of the direct-current engine-. SWITCHBOARD AND TRANSFORMERS CHIPPEWA driven generators. The kicking coils stand on the engine roomIInor back of the high-tension board. A 20-ton hand-power crane, built by the Brown HoistingMachine Company, of Cleveland, and provided with two cars,covers the entire engine room. Care has been taken in design-ing the machinery to arrange the basement so that all heavypieces can be handled by taking up the floor. TRANSMISSION The high-tension lines are built uniformly with 35-ft. polessi t 6 ft. in the ground. The three-phase lines are No. 3 and wire, according to requirements, a portion of it copper anda portion aluminum. Four wires are used on each circuit, allboards being arranged so that the fourth wire can be usedwhen there is trouble on any of the other three. Locke No. 3brown porcelain insulators, mounted 011 iron pins with woodtips boiled in paraffinc, are used. Cross-arms arc standard, 3^4 ins. x 4 ins. x 42 ins. Frequent troubles with iron cr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
