SU1528680A1 - Track circuit - Google Patents

Abstract

The invention relates to railway automation and remote control and can be used in areas with reduced insulation resistance of rail lines in areas with autonomous traction. The purpose of the invention is to increase reliability. An alternating current source 1 through an isolating capacitor 2 (which eliminates the closure of direct current) and limiting resistance 3 is connected in parallel with the direct current source 4, choke 6 and direct current relay 7 to one end of the rail line. In normal mode, resistance 3 is shunted by contact 7.1 of relay 7, which is live. When the wheel pair approaches the supply end, the relay 7 is de-energized, and the resistance 3 is turned off. In normal mode, due to capacitor 9 recharging, the voltage shaper 10 operates and sends pulses to the track relay 11. With the shunt mode, the variable component decreases more significantly than the constant component, and at the input of the amplifier-limiter 8 there will be single-pole pulses As a result, the capacitor 9 will not recharge, and the driver 10 will not output pulses to the relay 11. The use of this track circuit is possible with an insulation resistance of less than 1 ohm ^. km 1 il.

Description

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The invention relates to railway automation and telemechanics and can be used in areas with reduced resistance, insulation of rail lines in areas with autonomous traction.

Tse. 1 of the invention - increased reliability.

FIG. 1 shows a circuit diagram with a modified transmitting end; in fig. 2 - - rail scheme with a modified receiving end.

The device contains an alternating current source 1 connected via a coupling capacitor 2 and a limiting resistor 3 parallel to a direct current source 4 to one end of the rail line 5, to which is also connected via a choke 6 of a direct current relay 7 with front-end contact 7.1. To the other end of the rail line 5 there is an amplifier-fence, 1b 8 and, through an additional capacitor 9, a voltage driver 10, to the output of which the track relay 11 is connected, and at the receiving end it is known (; between the track relay 1 1 in. Bal.1astnp1 resistor 12 and a transformer,.

Source 4 has greater internal resistance.

Re: 1s () wa chain works as follows.

In the normal mode, the input resistance of the direct current current is large and relay 7 is under current, the resistance 3 is shunted by its contact, due to which the resistance of the supply end is small. Capacitor 2 prevents the passage of direct current through source 1 and for alternating current its resistance is very small, and since the input resistance of the supply end is small, the change in the insulation resistance of the rail line has little effect on the voltage of source 1.

When the shunt is pinched at the feed end of the track circuit or at the approach from the relay end side, the relay 7 de-energizes and delays the resistance 3, as a result the source 1 will be locked and the wheel pair connected in series with the resistance 3.

In the normal mode, there is a constant and alternating current at the relay end, i.e. there is a bipolar voltage with a pronounced difference between 11 ply, and 1 negative amilite.

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As the insulation resistance decreases, the signal at the relay end decreases, but its character remains the same. When a shunt is imposed, the nature of the signal changes, as the variable component will be weakened more than the constant component. In normal mode, the variable is a slightly larger constant component.

At the relay end, the signal is amplified by the limiting amplifier 8, at the output of which two-polar pulses will have, instead of, which through the capacitor 9 act on the input of the driver 10, the capacitor 9 is recharged. As a result, impulses will be present at the output of shaper 10 and relay 11 will be energized. The elimination of the de-energization of the relay in the pauses of the pulses from the output of the imaging unit 10 is achieved by turning on the diode parallel to the winding of the relay 11.

In the bypass mode, at the relay end, the signal will be unipolar, since the variable composition, / 1 is attenuated more than constant, the capacitor 9 will not recharge and the relay 11 will be without current.

The proposed rail price, by shunting resistance 3 and switching on source 4 with a large internal resistance, can operate with an insulation resistance significantly less than 1 ohm-km.

Claims (2)

1. A rail circuit containing an AC source, connected via a coupling capacitor and a limiting resistor to one end of the rail line, to the other end of which a track receiver is connected, characterized in that it is supplied with a DC source to increase reliability, connected to the control relay, the front contact of which is connected in parallel to the limiting resistor, and the winding is connected to the first end of the rail line. 2. The rail circuit according to claim 1, wherein the track receiver comprises successively connected amplifier-limiter, voltage driver and track relay, and an additional capacitor is connected between amplifier-voltage limiter and voltage driver, and the inputs of the amplifier-limiter form receiver inputs. r h: P 3 Yu fieL