SU1752594A1 - Device for checking detachment of trolley of vehicle - Google Patents

Abstract

Usage: DC electric transport. SUMMARY OF THE INVENTION: Detection of self-induction current pulses arising in a load as a result of a sharp decrease in current when the current collector is detached from the wire. For this, the primary winding of the transformer is connected to the current collectors parallel to the load through a diode, the secondary winding of which is included in the control circuit of the switch connected to the pulse counter coil. 1 il.

Description

This invention relates to direct current electrotransport.

Devices are known for monitoring disconnections of a current collector from a contact wire of electrified railways, based on the conversion of luminescence and induced radiation, which occurs when the current collector is torn off from the drive. In some devices, the luminescence through telephoto lenses through the optical fibers reaches the photodetector, the signals of which are amplified and fixed by the indicator. The duration and intensity of the glow determines the degree of wire wear, however, these factors depend on the magnitude of the current to be broken, the speed of movement, the atmospheric conditions and others, so the results are not always confirmed. In other devices, the induced electromagnetic radiation is monitored by telephone and recorded. These emissions distort communications signals. /

The complexity of the known devices installed on the roof of special wagons, following the locomotive, eliminates their use on city and mining electric transport. In addition, they only fix the separation of the current collector and do not affect the processes occurring during the separation.

The intensity of the luminescence largely depends on the emf of self-induction, which occurs when the load current changes, which is directed in series with the voltage of the power source and causes overvoltages that accelerate the destruction of the insulation and the contact wire. Premature failure of electrical machines is due to damage to their insulation, therefore, to increase its reliability, it is necessary to reduce the overvoltage X |

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wives arising from the separation of the current collector.

Closest to the present invention is a device for monitoring the vehicle current collector disconnections from the contact wire, comprising a transformer, one of whose windings is connected to the measuring unit, and the second winding circuit is connected to the current collector.

 A disadvantage of the prior art is associated with low operational reliability. g

The purpose of the invention is to increase reliability. ,, v v

In the device for monitoring the vehicle current collector disconnections from the contact wire, the detection of the tears is performed using a pulse counter and a key, for control of which a transformer and a diode are used; the primary winding of the transformer is connected through the diode to the current collectors in parallel with the load, and the secondary winding to the switch.

The drawing shows a diagram of the proposed device. .,.:. ; -:

The diagram shows primary 1 and secondary 2 transformer windings, diode 3, control key 4, for example, a transistor, a reed switch and others, a pulse counter 5, a circuit breaker 6, current collectors 7 and 8, energy consumers 9 (motors and

.dr.).

The device works as follows.

In the normal position of the current collectors 7 and 8, the current through the winding 1 does not flow due to the large reverse resistance of diode 3, in the load 9, electromagnetic energy is stored. When the current collector 7 (8) is torn away from the contact wire or contacts 6 are opened when overloaded

the current in the load narrow 9 is sharply reduced, and in it the emf of self-induction is induced with the polarity indicated in brackets, for which

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diode 3 is connected in the forward direction, through winding 1 and diode 3 it closes the self-induction current circuit. In this case, in the winding 2, an emf of mutual induction is induced, acting on the key A, which closes the circuit of the counter 5 or other fixing device. The self-induction current flows until the contact of the current collector with the wire is restored, and during this time in the winding 2 the EMF acting on the key 4 is stored.

Since the self-induction current flows in the same direction as the operating current, electromagnetic energy is converted into mechanical energy in the motor,

doing useful work, rather than being released as heat in the contact gap, thereby reducing wire wear. For the same reason, the EMF of Self-Induction does not differ appreciably from the supply voltage, and its effect on the insulation is not described. Thus, the device for monitoring the disconnections of the current collector from the contact wire, in addition to fixing the separation, reduces from the contact wire and electrical equipment. Last especially

it is important because it is much more difficult to detect hidden insulation damage than wires.

Formula and Device for monitoring the vehicle current collector disconnections from the contact wire, containing a transformer, to one of the windings of which the measuring element is connected, and the second winding circuit connected to the current collector In order to increase reliability, it is equipped with a diode connected in series with the second winding of the transformer, while the neo outputs of the diode and the second winding are intended for connecting electricity consumers. ;;;

Claims (1)

For rmule and zobret n I A device for controlling the detachment of the vehicle’s current collector from the contact wire, containing a transformer, one measuring coil is connected to one of the windings, and the second winding circuit 35 is connected to the current collector, so that, in order to increase reliability, it is equipped with a diode connected in series with the second winding of the transformer, while the unconnected conclusions of the diode and the second winding are designed to connect consumers of electricity. j-