. Electric railway journal . lway Journal Vol. 57, No. 15 auxiliary battery and, of course, the usual circuitbreakers, etc. Essentially these devices are built alongstandard lines. The operating devices for the heavyswitches are motor-driven, solenoid operation being usedwhere sufficiently powerful. For the operation of the relays and electrical switch-gear, special auxiliary sources are required as follows: A small single-phase transformer connected to theprimary winding of the main transformer. To this areconnected the operating devices of the alternating cur-rent switchgear, the voltage coi
. Electric railway journal . lway Journal Vol. 57, No. 15 auxiliary battery and, of course, the usual circuitbreakers, etc. Essentially these devices are built alongstandard lines. The operating devices for the heavyswitches are motor-driven, solenoid operation being usedwhere sufficiently powerful. For the operation of the relays and electrical switch-gear, special auxiliary sources are required as follows: A small single-phase transformer connected to theprimary winding of the main transformer. To this areconnected the operating devices of the alternating cur-rent switchgear, the voltage coils of the time-circuitrelays and the no-voltage relays. A small portable storage battery is used for trippingthe main switch supplying current to the rotary aswell as energizing the coil of the polarized relay duringthe starting period. The feeder switches have a no-voltage release. The energy for operating the directcurrent contactors is obtained from the rotary the first start in the morning and for the shutting. CONNECTION DIAGRAM FOR AUTOMATICSUBSTATION 1. Transformer primary switch 15. Busbar out 2. Transformer 16. Station busbar 3. Synchronous converter R = Overload relav 4. Starting switch J?i, R^. Ri. R-; = Time Machine automatic breaker relays 6. Feeder automatic breaker = Polarized relay 7. Field rheostat i?5 = No-voltage relay 8. Overspeed centrifugal switch Ra = Feeder relay 9. Auxiliary transformer C1-C9 = Contacts 10. Hand switch Jl/i, M2 — Motor-switch operating 11. Time switch device IL. Auxiliary battery ilfa. il/4 = Solenoid-switch operat- 13. Resistor ing device 14. Busbar in down in the evening a simple time switch is used bymeans of which, in starting, the in bus is put underpressure, and this in turn energizes the relays in afixed sequence and causes the closing of the correspond-ing switches. The release mechanism of the main switch is con-nected across the bus system, which after the function-ing of the release system is conn
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