SU652015A1 - Vinnik's apparatus for measuring the asymmetry of the ac traction current in rail circuits - Google Patents

Description

The invention relates to the field of measuring the electrical characteristics of rail circuits used in railway transport, and, in particular, to measure the asymmetry of alternating current in rail circuits.

A device for measuring the draw current is known, for example, Dietz's clamp type C-90 1.

The disadvantage of measuring with the help of Dietz’s pincers is the impossibility of finding the damage location that caused the asymmetry of the traction current.

It is also known a device for measuring the asymmetry of an alternating traction current in rail circuits, comprising receiving catuples, diodes, a measuring instrument, and a directional relay connected to a power source through a motion direction switch 2.

A disadvantage of the known device is the complexity of the technical implementation, the large measurement error due to variations in the parameters of individual functional elements of the device, as well as the impossibility of accurately determining the site of damage, which causes asymmetry of the current.

The purpose of the invention is to increase the accuracy measured and.

 This is achieved by the fact that the device is equipped with KHonKaiyiH selective connection of the receiving coils, while the rear receiving rollers in the direction of movement are connected to the measuring device via diodes, selective connection buttons and rear contacts of the corresponding direction relay in parallel and antiphase.

FIG. 1 shows a circuit diagram of the device; in fig. 2 - time diagram of his work. The device contains receiving coils 1,2,3,4 relays 5 and 6 of direction, connected to the power source (not shown) through switch 7 of direction.

Claims (2)

Rear-mounted take-off rollers through rear contacts 6.1, 6.3, 6.6, 6.7 relays 6 or contacts 5.1, 5.3, 5.5 and 5.7 relays 5, as well as through diodes 8 and 9 and buttons 10 and 11. coils (1,2,3,4) are connected to the measuring device 12. Through the front contacts 6.2, 6.4, 6.6 and 6.8 relays 6 or contacts 5.2, 5.4, 5.6 and 5.8 relays 5 are forward in direction The receiving coils are connected to the automatic locomotive signaling equipment (ALSN) (not shown in the drawing). The device works in the following way. A single moving unit, for example, a trolley, equipped with a device for measuring the asymmetry of alternating traction current in rails (frequency 50 Hz), is sent to a yellow light following the train ahead. The reverse current from the front electric locomotive is distributed in rail wires in proportion to their conductivity. When setting the directional switch 7, for example, to the Vpe position. Ed, the relay direction 5 is energized. At the same time, the forward receiving coils, for example 1 and 2, through the front contacts 5.2, 5.4, 5.6 and 5.8 of relay 5 are connected to the ALSN equipment and ensure the normal operation of the locomotive signaling. Between the coils I and 2 are included in series with respect to the signal current ALSN and counter with respect to the current. Rear receiving coil 3 in the direction of movement is connected to measuring device 12 through rear contacts 6.1 and 6.3 of relay 6, diode 8 and selective connection button 10 are directed, receiving coil 4 is connected to device 12 through rear contacts 6.5 and 6.7 of direction 6 relay, diode 9 and button 11. The rear coils 3 and 4 are connected in parallel and oppositely with respect to the reverse current. The traction currents flowing in rail yarns, ITJ and 1ta (Fig. 2), the asymmetries of which are measured, are induced in the receiving rolls 3 and 4 by the EMF and ETJ, respectively, which are rectified by diodes 8 and 9 and act counterphasically on the measuring device 12, graduated by current in the rails. If the traction current in rail wires is distributed evenly (IT IT), then both the induced EMF are equal (Exj ETJ) and the meter 12 gauge is zero, which means the symmetry of the rail circuit, If then measuring device 12 will show the difference D IT, i.e. the absolute value of the current asymmetry. Due to the fact that the measurement of the asymmetry of the traction current is carried out with the help of the receiving coils rearward in the direction of movement, i.e. after the rail track shunt formed by the wheel pairs of the mobile unit, the traction current in the rails is distributed evenly until the point of damage and asymmetry is not fixed. After driving through the place of damage of the track circuit, the device will show asymmetry, thereby fixing not only the fact itself, but also the place of damage. In the case of a short-term loss of the shunt by the mobile unit, the measuring device 12 will not react to the signal current ALSN ICKPH- with a frequency of 20 Hz, because for it the receiving coils 3 and 4 are switched on according to the induced EMF from it using diodes 8 and 9 the asymmetry., most fully characterizing the state of the track circuit, is measured by the magnitude of the traction current in each rail track separately. For this, the circuit of one of the receiving coils 3 and 4 is alternately disconnected with the help of selective connection buttons 10 and AND, and the absolute value of the components of the draw current 1c and 1tz is measured. The asymmetry coefficient Kae is calculated using the well-known formula 1t, -1 IT, - "- H. Similarly, the device operates during the movement" Back. In this case, the downstream coils (3 and 4) serve to operate the locomotive signaling system, and the rear coils (1 and 2), in the direction of travel, measure the asymmetry of the pulling current. The device makes it possible to determine the very fact of the presence of asymmetry of the traction current, the coefficient of asymmetry and the place of damage in the track circuit. The use of the device will improve the quality of the content of rail circuits, the reliability of the automatic blocking and automatic locomotive signaling and thereby increase the safety of trains, the invention The device for measuring the asymmetry of the alternating current in rail circuits containing receiving coils, diodes, gauge, relay direction connected to a power source through a motion direction switch, characterized in that, in order to improve the measurement accuracy, it is provided with kami izbiratelnogo- connecting the receiver coils, wherein the rear in the direction of movement of the receiving coils are connected to. Meter through diodes selectively connect button and rear contacts of the corresponding relay directions parallel and opposite phase. Sources of information taken into account in the examination five, -one. Dmitreenko I.E., et al. Measurements in devices for automation, telemechanics and communications in rail transport. Gansport, 1975, p. 216. b 2. Bibliographic information ed. TSNIITEI MPS "Index of unpublished materials. Seri I 1, No. 6, M., p. 31 to a pagruguflf atmoHttmiMffj MMM miiSitff fVf ttnrtiaftfiat