. The Street railway journal . en a new station is built. As an alternative a sub-station with rotary converters and a high voltage feedingline may be installed. In the case of a long interurbanline the feeder copper is a burden from the very start, andthe question of separate stations versus transmission tosub-stations is at once pertinent. The advantages of thisprocedure may be very material. In the first place, allthe power generation is done in a single large station,which can be located at the most advantageous point alongthe line, so that one gains the saving always found in work-ing on
. The Street railway journal . en a new station is built. As an alternative a sub-station with rotary converters and a high voltage feedingline may be installed. In the case of a long interurbanline the feeder copper is a burden from the very start, andthe question of separate stations versus transmission tosub-stations is at once pertinent. The advantages of thisprocedure may be very material. In the first place, allthe power generation is done in a single large station,which can be located at the most advantageous point alongthe line, so that one gains the saving always found in work-ing on a large scale. Second, by this concentration thecentral station gains in having a load factor somewhatbetter than any one of several separate stations could have,while the load factor of a rotary transformer station cannever lead to any gross inefficiency. All this is very nice, but there are a few other things tobe remembered. The cost of the rotary converters, trans-formers, line and generator and station capacity to operate. 5i6 the sub-station system will generally be greater than thecost of separate stations—much greater if these stationsare few in number and of fairly large capacity. Usually,too, the total labor account will be increased rather thandiminished, since there will always have to be at least asmall force at each sub-station and added force at the mainstation, besides the care of the transmission line, an itemwhich it is by no means safe to neglect. And finally it must not be forgotten that for every from the terminals of the rotary converters atleast il must be generated at the central station, andusually more than this. In other words, one cannot rea-sonably expect to get from the transmission system—line,transformers and rotary converter—an all-day efficiencyhigher than about 80 per cent, and it will oftener be 75 percent than 80. If one were working under conditions ofmaximum economy 80 per cent could certainly be sur-passed, but ra
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
