. Electric railway journal . eldreversal is required to establish correctpolarity. Direct-Current Feeders forCity ServiceWe have felt since the beginning, andhave more or less definitely establishedthe fact, that the current-limiting re-sistance type of feeder in city serviceis not very desirable because only inthe event of short-circuit is it desiredto open a feeder circuit. If, due to con-gestion of cars, the feeder section isoverloaded, it is obviously desirable tohold that section at as near full voltageas possible to clear the congestionquickly. To insert resistance andfurther lower the v
. Electric railway journal . eldreversal is required to establish correctpolarity. Direct-Current Feeders forCity ServiceWe have felt since the beginning, andhave more or less definitely establishedthe fact, that the current-limiting re-sistance type of feeder in city serviceis not very desirable because only inthe event of short-circuit is it desiredto open a feeder circuit. If, due to con-gestion of cars, the feeder section isoverloaded, it is obviously desirable tohold that section at as near full voltageas possible to clear the congestionquickly. To insert resistance andfurther lower the voltage under theseconditions only aggravates the conges-tion. With this idea in mind there hasbeen brought out a type of feederequipment which eliminates this cur-rent limiting resistance. The feeder isso designed that it will not trip on alegitimate overload, but only in case ofa short circuit. This is accomplishedby means of a device which differen-tiates between a normal and an abruptrise in load. The breaker, once opened. Plan View op Semi-Outdoor Automatic Substation 58 Electric Railway Journal Vol. 58, No. 2
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