. Electric railway journal . sh-pot relay, which keeps the machineon the line for a period after the moment the demandfor current drops below 25 amp. in order that the ordi-nary passenger stop of a car will not shut down therotary, is set in this station for five minutes and tenseconds. The time lag of the power supply behind thedemand—that is, the time which elapses between theaction of the contact-making voltmeter and the throwingof the converters on the line—is one minute and thirtyseconds. Sequence of Operations in 1200-VoltAutomatic Station Beginning with the machines off the line, everyt
. Electric railway journal . sh-pot relay, which keeps the machineon the line for a period after the moment the demandfor current drops below 25 amp. in order that the ordi-nary passenger stop of a car will not shut down therotary, is set in this station for five minutes and tenseconds. The time lag of the power supply behind thedemand—that is, the time which elapses between theaction of the contact-making voltmeter and the throwingof the converters on the line—is one minute and thirtyseconds. Sequence of Operations in 1200-VoltAutomatic Station Beginning with the machines off the line, everythinginside the station is dead except the small transformerwhich supplies energy to the control apparatus and thecontact-making voltmeter which, of course, is alwaysenergized. When the voltage drops below 950, thecontact-making voltmeter, marked No. 1 in Fig. 5, closes 770^ 25<ycle AC. Choke Coils (Auxsnclosedwhen oilsw is ry \j%0Q/riW/25<yck Trans. No 9. h??0Y-AC 370/ SynchronousConverter Low. Drum ControllerComplete cycle 90sec--i AUTOMATIC SUBSTATION FIG. 5—WIRING DIAGRAM OF 1200-VOLT AUTOMATIC CONTROL EQUIPMENT 1. Contact-making voltmeter. 10 2. Double-contact relay. 11 3. Dash-potted relay. 14 4. 5, 6. contactor, 50 amp. 15 7. Oil switch. 16 8. Triple-pole double-thr ow switch, 50 amp. 9. 5-kva. 13,200/220-volt tranfsormer. 18 Key to Diagram Triple-pole starting contactor, 500 , 600-volt rotary contactor, 50 tubes. 500-amp. three-pole running 19, 20,21. 500-amp., 1200-volt, con-tactors. 22. Resistance boxes, ohms. 23, 24, 25. Instantaneous overload relays. 26. Inverse time-limit overload relays. 27. low-voltage relays. 28. Current transformers. 31. Pour-pole field exciting reverse relays. 50 ELECTRIC RAILWAY JOURNAL [Vol. 50, No. 2 a circuit through the double-contact relay, No. 2. Thisin turn completes the circuit through the d
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