. Electric railway journal . ne salient difference is the provision forstarting and stopping by hand and time clock, the con-trol taking care of all operating conditions otherwise. The Riehen substation is part of the Basel ElectricityWorks system, and it was built before the decision was reached to put in automatic equipment. It contains a250-kw., six-phase, 50-cycle rotary converter equippedwith a speed-limit device, transformer, regulativereactance coil, starting switch and field rheostats. Pro-vision was made in the design for two additionalrotaries of at least 250-kw. capacity each. This
. Electric railway journal . ne salient difference is the provision forstarting and stopping by hand and time clock, the con-trol taking care of all operating conditions otherwise. The Riehen substation is part of the Basel ElectricityWorks system, and it was built before the decision was reached to put in automatic equipment. It contains a250-kw., six-phase, 50-cycle rotary converter equippedwith a speed-limit device, transformer, regulativereactance coil, starting switch and field rheostats. Pro-vision was made in the design for two additionalrotaries of at least 250-kw. capacity each. This substation secures its power supply from theAugst plant at 6,300 volts. Time Switch Is Used Morning and Evening The essential parts of the automatic control equip-ment are as follows: Time switch for cutting equip-ment in or out at a predetermined time; transformerand starting switches; switch-operating devices; relaysof various kinds, namely, overload, time-limit, polarized,no-voltage, feeder; over-speed centrifugal switch,. 682 Electric Railway 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 fi
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