Patent GB-424401-A (GB)
Title: Improvements in or relating to electrical train illumination apparatus
IPC: H02J7/20
Filed: 1934-08-04
Abstract: 424,401. Self - contained supply systems. NAAMLOOZE VENNOOTSCHAP MACHINERIEEN-EN APPARATEN FABRIEKEN, 30, Croeselaan, Utrecht, Holland. Aug. 4, 1934, No. 22743. Convention date, Aug. 4, 1933. [Class 38 (iv)] Comprises a train-lighting system in which a turbo-alternator is provided on the locomotive and a battery in the luggage van, with three conductors passing through the train, a charging conductor 15, a lighting conductor 14, and a common return conductor 16. The battery connections are determined by means of a manual switch 19 and an automatic switch 18. Connection of the generator 4 to the conductors 14, 15, 16 is determined by an automatic switch ' 9 and a manual switch 10. When the generator voltage is correct the switch 9 closes, connecting one pole of the generator to the switch 10, by means of which the connection to the charging lead or to the lighting lead is determined. When this switch is to the left, the charging connection is completed. In this position of the switch, the compound field coil 6 is disconnected and a resistance 8 in the shunt field circuit is shorted, so that the generator voltage is high for charging. When the switch 10 is to the right the lighting connection is completed. In this position the winding 6 is in circuit and the resistance 8 is in series with the shunt field so that the voltage is lowered and regulated. Disconnection in both positions is automatically effected by the switch 9 on failure of the generator. In the lighting position of the switch 10, connection between the lighting and charging circuits is effected in the energized position of switch 9 through a resistance 17 and in the de-energized position through a conductor 60. The manual switch 19 on the luggage van has three positions, charging to the left, lighting to the right, and disconnected in the centre. In the charging position the battery is connected directly to the charging main. If the switch 10 is in the charging position and the generator is running, charging will take place. If the switch 10 is in the lighting position, the battery will be connected to the lighting lead either through the resistance 17 when the generator is running or directly when the generator is not running. In the lighting position of the switch 19, the connections are as follows :-When the generator is not running the battery is connected directly to the lighting main through the contact 42 of the automatic switch 18. When the generator is running and the switch 10 is in the lighting position, the operating coil 21 of the switch 18 is energized from the charging lead which is connected to the lighting lead through the resistance 17, and operates to connect the battery to the charging conductor, the resistance 17 preventing charging taking place, and also completes the circuit of an additional coil 22. If the switch 10 is in the charging position, the switch 18 operates to connect the battery to the charging lead, the lighting circuit remaining de-energized. In this position the current coil 24 of the switch 18 is energized. To maintain the voltage high until the last moment when switch 10 is being moved from the charging to the lighting position to ensure satisfactory operation of the switch 18, the short circuiting switch for the resistance 8 has an extended contact 54. The automatic switch 9 has contacts 25, 26 which are closed to short circuit the resistance 8 in the de-energized position of the switch. A relay 33 enables the luggage van light to be switched on irrespective of the circuit connections. When charging is taking place, the movable arm 39 completes the circuit through the lamps and resistances 37 from the charging conductor. For other conditions of the circuits the lamp circuit is completed through the contacts 40. If the locomotive is separated from the train while the generator is supplying the lights, the supply to the lamps will continue from the battery if the switch 19 is in the lighting position. To ensure that this switch is moved to this position under such conditions the supply to the luggage van lights is interrupted by a relay 44 except when the switch 19 is in the lighting position. A modification is described in which to obtain voltage regulation in the lighting position of the switch 10, a carbon pile regulator is used instead of a compound field winding.