. Electric railway journal . onous motor-generator sets in the Tacoma, Renton, Cathedral Falls,Hyak, and Cle Elum substations, and the remaining fivebreakers are placed one each on the new gearless pas-senger locomotives. On account of the lower cost ofthese breakers and the advantages of using the unitsystem throughout, each of the sets is protected by itsown high-speed breaker instead of one breaker per sub-station, the arrangement in the original general connections, location of circuit breakers,etc., are shown in an accompanying Thecircuit breakers for the substa
. Electric railway journal . onous motor-generator sets in the Tacoma, Renton, Cathedral Falls,Hyak, and Cle Elum substations, and the remaining fivebreakers are placed one each on the new gearless pas-senger locomotives. On account of the lower cost ofthese breakers and the advantages of using the unitsystem throughout, each of the sets is protected by itsown high-speed breaker instead of one breaker per sub-station, the arrangement in the original general connections, location of circuit breakers,etc., are shown in an accompanying Thecircuit breakers for the substations and locomotives areexactly alike, with the exception of interlocking andcalibration for tripping points. The circuit breakers were given a very exhaustivetest in connection with one of the 2,000-kw. sets be-fore shipment. It was found that the generators couldbe short-circuited with only sufficient cable in circuitto connect the different meter shunts, short-circuitingcontactors and high-speed breaker, without damaging. GENEKATOR OF ST. PAUL MOTOR GENERATOR SETEQUIPPED WITH FLASH BARRIERS the machine in any way and with practically no flash-ing at the brushes. A special reliability or endurance test was made aspart of the acceptance test of the breakers, duringwhich about sixty-five short circuits of different magni-tudes, fifteen of which were dead short circuits,were applied at intervals of about two and a half min-utes without cleaning the commutators or giving themany attention whatever. At the conclusion of thesetests, five dead short circuits were thrown on thesets within ten minutes. At the end of these tests thecommutators were in excellent condition without needof cleaning or attention of any kind. The application of the high-speed circuit breaker todirect-current electric locomotives is another distinc-tive advance, as, in addition to protecting the apparatuson the locomotive, it prevents the short circuits fromaffecting the substations. An incidental advantage
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