SU1588616A1 - Apparatus for transmitting tractice current along railway line - Google Patents

Abstract

The invention relates to railway automation, namely the electrification of railways, where the rail track performs the function of a return wire for the passage of a draft current, and can be used as a communication channel to control the occupancy of the block sections of the track. The purpose of the invention is to increase reliability. This is achieved by the fact that the compensating winding 5, which is connected in parallel and opposite to the main winding 3, eliminates the shunting of the signal current of the main winding. If the currents in the rail wires are unequal, they are partially equalized by the compensating winding, and the resulting magnetic flux in the magnetic core, which is created by the difference in the fluxes of the main and compensating windings, is mutually compensated. Thus, the signal current coming along the rail wires is not shunted by the compensating winding and is induced with the least losses in the signal winding, which ensures the condition of stable operation of railway automation devices. 4 il.

Description

The invention relates to railway automation, namely to the electrification of railways, where the track performs the functions of a return wire for the passage of traction currents, and can be used as a communication channel to control the blocking of sections of the track sections.

The purpose of the invention is to increase reliability.

Figure 1 presents the scheme of the device; Fig. 2 is an electrical circuit diagram of the device; Fig. 3 shows the magnetic coupling between the windings; 4 is an equivalent replacement circuit with magnetic connections.

The device contains a W-shaped magnetic conductor t with a rm 2, on the middle rod of which there are half windings of the main winding 3 and the first additional winding 4. on the external rods of the magnetic conductor there is a second additional (or compensating) winding 5. Magnetic guide with air gap 6.

The device works as follows.

To compensate for the magnetic flux in the magnetic circuit of the device, due to the difference in the currents of the semi-windings li and 12 of the main winding, an additional component is connected parallel to the main winding. The secondary winding 5 (FIG. 3). When asymmetries are made in rail wires and 12, part of the unbalance current in the rail wires (I-12} flows through the additional winding and their partial alignment occurs in the semi-windings. Due to the inequality of the currents H and 12, a magnetic flux. Occurs in the device core. And - la) I Wi, where Wo is the number of turns of the main winding half-winding, however, due to the fact that a 1z current flows through the additional winding 5, the magnetic flux Fd of which is directed opposite to the flux Fo, the main magnetic flux is compensated. In order to avoid shunting the signal current with a compensating winding, the number of turns and its cross section are chosen so that the impedance of the signal current of the compensating winding is significantly greater than the main winding impedance (ZKO Zoo). This circumstance makes it possible to avoid additional measures to exclude shunting the signal current of the main winding and reducing the voltage on the signal winding, i.e. from series connection with a compensating winding, tuned to the signal frequency by structurally cumbersome filter plugs, or parallel connection of a capacitor.

A device with an additional compensating winding 5 placed on the side rods of the magnetic circuit, which is connected counter and parallel to the main winding, made of brass,

The device for signal current, taking into account the inclusion of the compensating winding in the above manner, is represented by an equivalent replacement circuit (FIG. 4), from which the pattern of the distribution of the signal current coming from the line to terminals 7-8 between the main and compensating windings is seen. Neglected power of active resistance of windings compared to inductive resistance

.Z

(for bUU), with high accuracy for practical calculations, it can be assumed that for the signal current the main winding impedance

Zi jW {Li + M),

and the second additional (compensating)

Z3 jW (L3 + M).

In order to reduce the shunting of the signal current by a compensating winding, it is necessary to ensure that

, 1h

or

I-.

what meets the requirement

W3

k and 777-.

Wi

To ensure the effect of DC compensation, the ratio

l3w3 (li-l2) wi / 2,

where Wi and W3 are the number of turns in the main and compensating windings;

1h - current in the compensating winding:

Ii and h are the currents in the semi-windings of the main winding.

Finally, the condition of compensation of the magnetic flux of direct current

R3Wi RiW3, or

R3 Ri aRi. L / 1

This is equivalent to the condition RZ 1z pi li

S3 si

where h, 1z - the length of the main and compensating windings;

/ 31 - material resistivity of said windings;

Si, 5z-winding section, from where the compensating winding section

with. Si

With reference to the devices existing at electric direct current, to perform a compensating winding (at for 10) in 160 turns with a cross section

S3 Si 2.83-8-1 SL "250mm is almost impossible due to its overall dimensions. To reduce the cross section of the compensating winding, it is necessary to increase the resistance of the main winding by running it at the same geometrical dimensions.

Ohm mm

M

for example, from brass (pl 0.05

reduce the length of the compensating winding by placing on the thinner side rods of the magnetic core, which will allow a 4 times reduction in the cross section of the copper compensating winding. An increase in the active resistance of the main winding does not significantly affect the parameters of the traction network, since the resistance of 1 km of the rail track with P-65 rails will be 6 times greater.

If the traction currents are equal in the rails Ii and 12, the potentials of points 7 and B will be equal and there will be no current in the compensating winding. With the asymmetry of the traction current (bh), the asymmetry current is distributed between the main and compensating windings in such a way that the magnetic fluxes created by them mutually compensate

 one

ensuring the absence of magnetic flux from the magnetic current in the magnetic core, which creates optimal conditions for the transformation of the signal current into the signal winding. In any mode of operation of the proposed device, the tap of the signal current into the compensation winding 5 with the selected ratio K 10 will be

insignificant and practically does not affect the signal level at the output of the signal winding, which ensures the condition of stable operation of the signaling device.

0

Claims (1)

The invention The device for passing a current through a rail line, containing a magnetic core, on the middle rod of which the main winding and one of the additional windings are wound, and the other one is included opposite to the main winding, in order to increase reliability, the other additional winding located on the external rods of the magnetic circuit and is made with the resistance of each turn of it, equal to the resistance of one turn of the main winding, and with the number of turns 10 times the number of turns of novnoy winding. Fig.G eight ts61 -ft 62-sg FIG. 2 7 / Fig-3 M . FIG. four 0 s