. The Street railway journal . of a dead short-circuit isof more importance in determining the use of certain circuit breakers than the fact that they will permit a certaincurrent with minimum heating, and safely stand on opencircuit a certain voltage. For possibly at the instant of theinterruption of the circuit by the switch, an energy of fivetimes the normal capacity of 5000 kw in generators may beexerted with a possible failure of the circuit-breakingswitch. Hence the station kilowatt capacity is importantinformation when advice is requested as to the suitabilityof a circuit breake
. The Street railway journal . of a dead short-circuit isof more importance in determining the use of certain circuit breakers than the fact that they will permit a certaincurrent with minimum heating, and safely stand on opencircuit a certain voltage. For possibly at the instant of theinterruption of the circuit by the switch, an energy of fivetimes the normal capacity of 5000 kw in generators may beexerted with a possible failure of the circuit-breakingswitch. Hence the station kilowatt capacity is importantinformation when advice is requested as to the suitabilityof a circuit breaker at the given station voltage and thespecified normal current. In transmission systems where the line runs to one sub-station and from there branches to a second sub-station, itis good practice to take the line going to the more distantsub-station from the line side of the near sub-station switchinstead of from the sub-station side. The more distant sta- □ □ □ □ \AAMMrW—( Potential ,/yyyyy,__^Tran sf o rme r 6 □ g. 0— 0 0 Plug forReadinjf Voltajft Plug- fur Machinebeing Synohronizeil- Pluij tor MaohilieRunning. Slrect FIG 8 - HIGH POTENTIAL MACHINES SYNCHRONIZING WITH EACH OTHERUSING MACHINE VOLTMETERS tion can then be run when the bus-bars of the near sub-sta-tion are cut ofif. In case of duplicate incoming lines andduplicate lines to the more distant sub-station, the same ar-rangement should be followed of tapping the outgoing linesfrom sub-station No. i to sub-station No. 2, from the in-coming lines back of the sub-station switches of No. i, in-stead of from the No. i sub-station bus-bars. In casecross-connecting switches be used so that one-half of lineNo. 2 can be run on the half of line No. i, air-breakswitches may be used. The usual method of synchronizing alternators is to con-nect a lamp or lamps in the circuit of two potential trans-formers, the secondaries of which are connected in series,and the primaries are connected to the different circuit
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
