RU1798235C - Device for supply track circuits - Google Patents

Abstract

Usage: in the field of railway automation, in particular in rail chains. The essence of the invention: when disconnecting or switching the feeders, the phase control relay turns off and switches its contacts, which turn on the thyristor, and the voltage appears on the buses. If this voltage is in phase with the local voltage source of the phase control relay through the thyristor it receives power, at antiphase voltages the relay does not receive power phase monitoring.2 ill.

Description

The invention relates to the field of railway automation and telemechanics, in particular to rail chains.

The purpose of the invention is to increase reliability.

This goal is achieved in that the other terminal of the first winding of the phase control relay through its own rear contact and one of the resistors is connected to the other terminal of the track power supply connected to the anode of one of the thyristors, and through the front contact of the phase control relay and another resistor with the control an electrode of the first thyristor, parallel to the junction of the cathode-control electrode of which another diode is connected, and the cathode is connected to the beginning of one of the network windings of the transformer, the end of which is connected to the end of another network windings connected by the beginning to the second output of the path power supply, and another winding of the phase control relay is connected to one of the terminals

output winding made with the middle output connected to the other output of the second winding of the phase control relay through the cathode-anode junction of the second thyristor and to one of the local power supply leads, the other output of which is connected through the third resistor to the control electrode of the second resistor, in parallel transition, cathode - the control electrode of which is connected to the third diode.

In FIG. 1 is a schematic diagram of an apparatus for feeding rail circuits; in FIG. 2a-e are voltage plots at the output of the track and local converters with their various inclusion in a three-phase AC network.

The device for supplying rail targets contains a phase control relay 1, the first winding of which is connected through its own rear contact 1.1 and the resistor 2 to the power source, and the second winding through the anode-cathode transition of the thyristor 4 is connected to the middle

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parts of the output winding of the transformer 5, network half-windings, respectively, with the first terminals through the cathode-anode junction of the thyristor 6 and directly connected to the power source 3. The control junction of the thyristor 4 through a resistor 7 is connected to the reference voltage source 8, and the control electrode of the thyristor 6 through a resistor 9 and front contact 1.1 of the relay 1 phase control - with its own anode. Parallel to the control junctions, thyristor 4, 6 and the first winding of relay 1 are connected, respectively, diodes 10, 11, 12, the network half-windings of the transformer B are connected in series with the second terminals, and the capacitor 13 is connected in parallel with the second winding (positions 14 and 15 rail supply busbars).

In FIG. 2 shows the following voltage graphs: a) a three-phase AC network of 50 Hz; b) possible variants of the phases of the local (reference) voltage when switching on the local (reference OPU) converter in phase A of a three-phase network; c) possible variants of the voltage phases of the traveling (slave HPV) converter included in phase B of a three-phase network; d) possible variants of the voltage phases of the traveling (slave HPV) converter included in phase C of the three-phase network; d) possible voltage phases of the path (slave HPV) converter included in phase A of the three-phase network.

A device for feeding rail circuits operates as follows.

When disconnecting or switching the power feeders, the voltage at the output winding of the transformer 5 is turned off and the phase monitoring relay releases measles, the circuit takes the form shown in Fig. 1. When power is turned on from positive half-cycles along the first winding through its own rear contact 1.1 and resistor 2, the phase control relay 1 is energized. With front contact 1.1, it includes thyristor B and a voltage of 25 Hz appears on the 14.15 busbars (output winding of transformer 5). If this voltage is in phase with the voltage of the local (reference) source 8. then through an open thyristor 4 relay 1, the phase control on the second winding will receive power from the middle part of the output winding of the transformer 5 in each positive half-cycle and will be blocked through its own front contact 1.1, included in the control circuit of the thyristor 6. At this point, the process of turning on the device ends.

If, when the device is turned on on the buses 14, 15, the voltage is in phase-to-phase with the voltage of the local (reference) source, then relay 1 controls the phases

the second winding will not receive power, because despite the presence of a control signal in the power circuit of thyristor 4, there will be a negative half-cycle for which thyristor 4 represents a high resistance. Relay 1 phase control releases measles. After closing the rear contacts 1.1, the switching process will be repeated as described. This transient condition will last as long as

5 on the busbars 14, 15 of the device, the common-mode voltage with the voltage of the local (reference) source 8 is not present.

To obtain a voltage device on tires 14, 15; 90 ° phase-shifted

0 it is necessary to turn on the device in the opposite phase of the three-phase network as the source of local (reference) voltage. To do this, it is necessary to swap the wires that fit to the poles of source 3. If, when the input voltage of the device is turned on, buses 14, 15 receive voltage that is 90 ° ahead of the voltage of the local (reference) source, circuit The device will operate similarly to the case of common mode voltages. This is explained by the property of a triode thyristor, thanks to which, after opening with a short pulse, it maintains the open state of the power circuit until the first

5 transition of current through zero. If, when the device is switched on on the buses 14, 15, a voltage is observed that is 90 ° behind the voltage. If there is no local (reference) source, then the device circuit will work similarly to the case of antiphase voltages.

The device, due to the indicated property of the thyristor, makes it possible to ensure the phase constancy of the output voltage of the track (slave) converters at

5 inclusion of local (reference) and track converters in various phases of a three-phase network with a certain step. This is illustrated by voltage plots (see Fig. 2). Turn on converters

0 for the corresponding phases of the three-phase network is marked with vertical arrows. The positive half-periods of the local (reference HFR) and traveling (slave HPV) voltage converters5 coinciding in time are marked with a hatching in the figure. .....

From the graphs it is seen that the phasing element using a triode thyristor due to the connection of the path (slave HPV) converter to various ones;

phases of a three-phase network, allows to obtain voltage at the output of the rail-rail power supply device with the following shifts in the direction of lagging or leading in relation to the local (reference): 0, 30, 60 °, etc. every 30. These phases are shown in graphs with the axis of reference passing through the middle of the first positive half-cycle of the voltage of the local (reference HRE) converter included in phase A of the three-phase network.

Thyristor 6, transformer 5 and capacitor 13 are an inverter 50/25 inverter in which thyristor 6 has two functions: a switching switching element and a rectifier providing parametric resonance in the frequency converter.

The diode 12 functions as a one-half-wave rectifier and serves to slow down the release of the phase monitoring relay. Diodes 10, 11 exclude the passage of negative half-periods of current through the control transitions of the thyristors. Resistors 2.7.9 - protective, ballast.

Claims (1)

The claims A device for supplying rail circuits containing a local and local power supply, a transformer with two mains and an output winding connected to the rails, thyristors, diodes, resistors and phase control relays, one terminal of which is one of the windings, in parallel with which one of the diodes is connected, connected to one of the terminals of the track power supply, characterized in that, in order to increase reliability, the other terminal of the first winding of the phase control relay is connected through its own rear contact and one of the resistors is connected to the other terminal of the track power supply connected to the anode of one of the thyristors, and through the front contact of the phase control relay and another resistor to the control electrode of the first thyristor, parallel to the cathode junction - the control electrode of which another diode is connected, and the cathode is connected to the beginning of one of the network windings a transformer, the end of which is connected to the end of another network winding connected to the beginning with the second output of the traveling power source, and the other winding of the phase control relay is connected to one of the outputs of the output winding made about the middle terminal connected to the other terminal of the second winding of the phase control relay through the cathode-anode junction of the second thyristor and to one of the terminals of the local power supply, the other terminal of which is connected through the third resistor to the control electrode of the second resistor, parallel to the cathode – control electrode transition which the third diode is on.