. The Street railway journal . e continued by means of the sparewire. As this part of the line follows the track and may bereached from a tower wagon, it will be possible to replace an one being engine driven and intended, as a rule, only for use instarting the plant, but made of sufficient size to excite all threegenerators, thus serving as a reserve. This exciting unit con-sists of a marine set. The other two exciters are driven byinduction motors supplied from the high-tension bus, throughthree-phase oil-cooled core type step-down transformers, onefor each exciter. The switchboard equipment
. The Street railway journal . e continued by means of the sparewire. As this part of the line follows the track and may bereached from a tower wagon, it will be possible to replace an one being engine driven and intended, as a rule, only for use instarting the plant, but made of sufficient size to excite all threegenerators, thus serving as a reserve. This exciting unit con-sists of a marine set. The other two exciters are driven byinduction motors supplied from the high-tension bus, throughthree-phase oil-cooled core type step-down transformers, onefor each exciter. The switchboard equipment is somewhatsimilar to that of the sub-stations, three single-pole, form K,hand-operated oil switches being provided in the circuits ofeach generator, and in the supply circuit of each step-downtransformer for the exciters. The outgoing high-tension linesto the sub-stations are equipped with motor-operated, formH oil switches. These have a very great kilowatt-breakingcapacity, and this is considered necessary on account of the. ROTARIES, TRANSFORMERS AND SWITCHBOARD IN AMSTERDAM SUB-STATION insulator or make other repairs on the dead wire while theother three are in use. The generating station contains three main units, one ofwhich was intended for light loads and two for ordinary ser-vice, with one reserve. These units are rated at 1000 kw eachon a very moderate temperature rise, allowing for a 50 per centoverload for two hours and 100 per cent momentarily, theengines being made of corresponding power. It was antici-pated that the all-night lighting load would, after a short time,become sufficient to give a fairly economical load to one ofthese units, and for this reason the complication of a smallerunit was not considered advisable. These units run at 94r. p. m., requiring, therefore, thirty-two poles to give twenty-five cycles. They are of the usual General Electric type, withrevolving fields wound with copper ribbon on edge and withstationary armatures wound with heavily mu
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
