. The Street railway journal . resistance increasesin one arm and decreases in the other, causing wide variationsin voltage across the exciter field coils, the direction and in-tensity of the current in the coils varying accordingly. Theaction is somewhat analogous to that of Wheatstones bridge. With the polarity of the booster changing and its field ex-citation varying in intensity, it is possible automatically tocharge the main battery or to raise the battery voltage so as tocarry part of the load of the bus-bar. By limiting the motionof the lever arm it is possible to limit the load which t
. The Street railway journal . resistance increasesin one arm and decreases in the other, causing wide variationsin voltage across the exciter field coils, the direction and in-tensity of the current in the coils varying accordingly. Theaction is somewhat analogous to that of Wheatstones bridge. With the polarity of the booster changing and its field ex-citation varying in intensity, it is possible automatically tocharge the main battery or to raise the battery voltage so as tocarry part of the load of the bus-bar. By limiting the motionof the lever arm it is possible to limit the load which the batterywill carry under extreme conditions. With this system closeregulation of the load on the converter is obtained. The Best Arrangement of Switch Gear.—The most suitablearrangement of switch gear is obviously that which best facili-tates the manipulation of sub-station apparatus with a minimumoutlay. There are two distinct arrangements of switch gear, theiradoption depending upon the capacity of the sub-station. With. REGULATOR FOR USE IN CONNECTION WITH STORAGEBATTERIES one arrangement, which is especially applicable to small sub-stations, all of the switch gear is located upon the main floorwith the converters and with the transformers. The othermethod, which is usually employed in stations of large capacity,consists in locating all the manually-operated switches, exceptthe negative switches, in a switchboard gallery. It is worth noting that in the first case, where all the switch- ing apparatus is located on the same floor with the transform-ing apparatus, the station attendance is minimized, for theoperator may also perform part of the duties of station fore-man, and the converter tender may also perform the duties ofjanitor, thus dispensing with two men. But this system is notwholly advantageous. In the first place, it is difficult to keepthe switch gear clean, and in case of trouble the operator is toonear the converters to act with unconcern. On the other hand,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
