. Electric railway journal . e already in service, the incomingcable can be operated on a separate bus. Definite time-element, overload relays and low-voltagerelays are installed for the protection of the trans-formers and to disconnect the converters from thesource of supply of alternating current in case of trou-ble. The tripping circuits of the two circuit breakers oneach transformer bank are interlocked, so that the cir-cuit will be opened should a relay operate while load isbeing transferred from one bus to another, as is oftenthe case. The circuit breakers are equipped with shunttri
. Electric railway journal . e already in service, the incomingcable can be operated on a separate bus. Definite time-element, overload relays and low-voltagerelays are installed for the protection of the trans-formers and to disconnect the converters from thesource of supply of alternating current in case of trou-ble. The tripping circuits of the two circuit breakers oneach transformer bank are interlocked, so that the cir-cuit will be opened should a relay operate while load isbeing transferred from one bus to another, as is oftenthe case. The circuit breakers are equipped with shunttripping coils, which are used in connection with re-verse-current relays in the converter leads, to tripthe circuit breakers in case of a reversal of powerthrough the converter. The circuit breakers andthe transformer circuit breakers of each unit are elec-trically interlocked so that a breaker will open in-stantly should a corresponding oil circuit breaker converters are equipped with overspeed devices. FRONT AND REAR OF D. C. SWITCHBOARD PANELS 1148 ELECTRIC RAILWAY JOURNAL [Vol. XLVII, No. 25
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
