. The Street railway journal . case of a short circuit on any section of a third rail the circuit breakers at thetwo sub-stations thatfeed it will open, andit will be entirely dis-connected. On thedouble track part ofthe road, the thirdrails o n the t w oparallel tracks are notto be connected to-gether permanently,but form two separatesections connectedthrough the mediumof the sub-stationfeeder panels and bus-bars, just as are anyother sections. To the specialist inhigh-voltage switch-boards and switchingarrangements the in-stallation is of morethan usual interest, be-cause it is one of
. The Street railway journal . case of a short circuit on any section of a third rail the circuit breakers at thetwo sub-stations thatfeed it will open, andit will be entirely dis-connected. On thedouble track part ofthe road, the thirdrails o n the t w oparallel tracks are notto be connected to-gether permanently,but form two separatesections connectedthrough the mediumof the sub-stationfeeder panels and bus-bars, just as are anyother sections. To the specialist inhigh-voltage switch-boards and switchingarrangements the in-stallation is of morethan usual interest, be-cause it is one of thefirst large high-ten-sion alternating-current distribution plants to go into oper-ation in which all the switching will be done on the high-voltage side of step-up and step-down transformers. Eachgenerator in the power house has its own bank of threetransformers, and each rotary converter in the sub-stationshas its bank of three transformers. In each case the trans-formers are considered as a unit with the generator or con-. SECTION THROUGH CABLE TERMINAL verter. Each generator is connected with its bank of trans-formers directly without any switches or circuit other words, each generator and its transformers con-stitute practically a 26,000-volt machine. Doing away withall low-tension switching apparatus and depending onswitches in the 26,000-volt circuit alone is a proposition atfirst nothing short of startling to those familiar with thehigh-tension work that has been done in the past, and espe-cially that in the far West, where it is the practice to do asmuch of the switching as possible on the low-tension cir-cuits The manufacture of oil switches, which will withcertainty open circuits of over 20,000 volts, has, however,materially changed the nature of the problem. Once ahigh-tension switch is introduced which is easily operatedand certain in operation there are many reasons for doingway with the expense and complication of low-tensionswitches. The oil switch
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
