SU704835A1 - Electric lighting system for railway passenger car - Google Patents

Description

I

The invention relates to railway transport, in particular, passenger car illumination devices using nakaliian lamps powered from a direct current network.

A device for illuminating a passenger car with an increased voltage increase within 0.2-5 seconds 1 is known.

However, such devices are used for alternating current purposes.

The closest in technical essence to the proposed is a device for illuminating a passenger car, comprising two groups of incandescent lamps and a time relay connected to a direct current source through the contacts of the contactors for switching on these groups 2.

A disadvantage of the known device is that at the moment of switching on the lighting a current inrush takes place, 3-5 times higher than the current. rated operating current bulb. The reason for this is that the resistance of the cold lamp is several times less than in the operating state. Such inrush current leads to a dramatic reduction in lamp life.

The aim of the invention is to ensure the reliability of the Tzggem device to further reduce the inrush current when the lamps are turned on.

This is achieved by the fact that in the proposed device for electric lighting of a passenger car; containing two groups of incandescent lamps and a time relay connected to a direct current source through the contacts of the contactors of the specified groups between the specified groups of incandescent lamps included a thyristor, a bridged tsi, RC chain connected to the resistor and a diode, the middle point which is connected to the control electrode of the thyristor.

The drawing shows a diagram of the proposed device.

Claims (2)

It contains groups of incandescent lamps 1 and 2, which are connected to the direct current source NOV via contacts 3, 4 of the contactor with the coil 5 and contacts 6 and 7 of the contactor with the coil 8. The coil 5 of the contactor is connected to the same source through the starting contact 9, and Connector coil 8 is connected parallel to coil 5 through contacts 10 and I connected in parallel. Contact p is the contactor contact block with coil 8, and contact I is a time relay contact, winding 12 is connected in parallel to one of the groups (qjynne I a) through the contactor 13 contact 8. Between coil groups lamps 1 and 2 included a thyristor 14, zyshuntirbvanny chain of resistor 15 and diode 16. In parallel rezisth py included 15 chain of Pi resistor capacitor 18. Their total point is connected to the control electrode of the thyristor 14. The apparatus operates as follows. When the starting contact 9 is closed, the coil 5 of the contactor is energized, closed: its contacts 3 and 4. A circuit is formed from series-connected groups of lamps 1, resistor 15, diode 16 and groups of lamps 2. Resistance of resistor 15 should be equal to () the resistance of each group 1 or 2. At the same time, the capacitor 18 is gradually charged, as a result of which, with some delay in turning the contactor with the coil 5 on, the thyristor 14 is turned on. Both groups of lamps are now connected in series, each of them has a voltage of 55 V. It is p voltage is applied to the winding 12 timer. The time relay is triggered with some delay in relation to the turning on of the thyristor 14 and closes its contact 11 in the Steyi circuit of the contactor coil 8. This contactor turns on its contacts 6 and 7, as a result of which the lamps switch to parallel connection and the time relay coil de-energizes. The technical and economic efficiency of the proposed device is determined by increasing the durability of the lamps and simplifying the protection scheme due to the reduction of throws when the lamps are turned on. As shown by the test results, in the existing schemes for switching on incandescent lamps on ER2 and RSH trains, their switching frequency is 8-10 day. At the same time, up to 75% of the lamps get out of order at the moment of switching on. When switching to the proposed scheme, the durability of the lamps increases 1.8-2.1 times. Claims A passenger car electric lighting device comprising two groups of incandescent lamps and a time relay connected to a constant-current source through the contacts of the contactors for switching on these groups, characterized in that, in order to improve reliability by further reducing current surges when the lamps are turned on, between these groups of incandescent lamps included a thyristor, shunted by a chain of series-connected resistors and a diode, with an RC circuit connected in parallel with the resistor, point n which is connected to the control electrode of the thyristor. Sources of information taken into account during the examination 1. Device for limiting incandescent lamp currents, Light engineering, 1974, N 12. 2. Electric train ER- 2. Operation manual, Transport, 1974, p. 212-213.