. Journal of electricity . the value at which the relays inthe automatic substation are set which govern starting. Relay 1 is a contact making voltm-eter which is adjust-able for any particular trolley voltage desired, in this case500 volts. In connection with the overload relay .37, whichfunctions to shut down the station, these two relays are theprimary control in starting and stopping the station. Relay one closes instantaneously when the voltage dropsto 500 volts, short circuiting the coil of relay 2 which is atime-limit circuit-opening relay whose function is to providea time delay in sta
. Journal of electricity . the value at which the relays inthe automatic substation are set which govern starting. Relay 1 is a contact making voltm-eter which is adjust-able for any particular trolley voltage desired, in this case500 volts. In connection with the overload relay .37, whichfunctions to shut down the station, these two relays are theprimary control in starting and stopping the station. Relay one closes instantaneously when the voltage dropsto 500 volts, short circuiting the coil of relay 2 which is atime-limit circuit-opening relay whose function is to providea time delay in starting up the equipment as the low voltageconditions appear, as obviously simply a momentai-y swingbelow 500 volts should not be pei-mitted to start up thestation; the time setting of relay 2 can be adjusted to suitthe particular conditions at any point. The contacts of relay 2 are normally closed when thestation is not running. When relay 1 operates, closing itscontacts; relay 2, after a predetermined time, opens its con-. Near view of 210-kva. startingand 5-kw. transformer, motor operated oi! breakercontrol transformer. tacts and permits the coil of relay 3 to be energized. Relay3 then closes its contacts and control current from the transformer is admitted to the control cir-cuits of the station. A circuit is then established from the bus through the contacts of relay 27-X, the contactsof relays 3 and 26, operating coil of relay 4, auxiliary switchon circuit breaker and hand reset switch on oil switch motormechanism back to control bus. The closing of contactor 4establishes a circuit from the control bus through one of itscontacts to segment 13 on the controller, then to segment 16upper contact of auxiliary switch on brush raising device, andto the operating coil of contactor 6 and back to the controlbus. Operation of Controller — Contactor 6 closes and starts the motor driving thecontroller which is very similar to the ordinary type K str
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectricity, bookyear
