SU119196A1 - Apparatus for reducing the potential of the running rails and reducing stray currents on DC electric railways - Google Patents

Description

The known devices for reducing the potential of the running rails and reducing the stray currents on electric DC railways, which contain a direct current source included in the rassejk of the running rails, do not provide the possibility of automatic control of the emf. travel source.

In the described device, an independent excitation generator is used as a traveling current source, the excitation winding of which is included in the dissection of the contact wire, which allows automatic adjustment of the emf. travel source depending on the amount of current in the contact wire and increases the efficiency of the device.

According to the invention, the field winding can be connected via a rectifier to a source of non-temporal current, the value of which is regulated by the use of saturation throttles with a control winding included in the dissection of the contact wire; A static rectifier powered by an alternating current, adjustable throttle, the control winding of which is included in the dissection of the contact wire, can be used as a traveling current source.

FIG. 1 shows a diagram of the described device using as a traveling current source of a generator with independent excitation from a contact network; in fig. 2 - the same, with excitation of the generator through a rectifier from a network of temporary current; on fng. 3 the same, using as a traveling current source a static rectifier.

As can be seen from the diagram (Fig. 1), the DC generator / is connected to the rails on both sides of the insulated joint 2 and is driven by either an induction motor or a DC motor.

No. 119196-2 -

3. Winding. Excitation 4 is included in the dissection of the contact wire: yes. With such a scheme, with a weakly saturated car, its emf. and the current will be proportional to the current in the contact network. Consequently, it is possible to select the excitation in such a way that all the current of the consumer goes through the machine and, thus, the earth and underground structures will be free from this current.

Changing the characteristics of the machine (for example, due to its saturation), you can reduce the maximum value of its emf. and, therefore, do not pass through it the maximum current peaks, compensating for their action due to a slightly increased emf. at low currents.

In order to get rid of the need to apply a high voltage to the excitation of a traveling current source and use a conventional dyamoampernuyu machine, it is possible to power the excitation winding 4 from the AC source through solid rectifiers 5 (Fig. 2). A winding of 6 throttles of saturation is included in the dissection of the contact wire.

The change in current in the contact network causes a corresponding change in the flow in the core of the throttle. An increase in the throttle magnetic flux leads to a decrease in the reactance of the winding 7 and, consequently, to an increase in the current in the excitation circuit of the machine and the electromotive force of the current source included in the rails.

You can make power with variable emf. and from a static current source. As the latter, a direct current transformer (Fig. 3) can be used, where 5-solid rectifiers, 6 and 7 are saturation droplet windings, 8-step down transformer.

In double-track sections, one machine with two excitation windings can be used.

The simplest problem is solved when using DC transformers to energize the machine (Fig. 2) or directly as a current source (Fig. 3). In this case, to obtain the necessary dependence of the current in the rails on the total current in the contact wires, it suffices to add one more winding to the saturation inductor included in the dissection of the second contact wire.

When rolling stock passes over an insulated joint, the traveling current source is short-circuited. Such a short-term mode is generally not dangerous for setting up, normally working with very large currents.

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Claims (3)

1. A device for reducing the potential of the running rails and reducing stray currents on DC electric railways, containing a traveling DC source included in the railing of the running rails, characterized in that, in order to increase its efficiency, a traveling current source is used an independent excitation generator, the excitation winding of which is included in the dissection of the contact wire. 2. A device change according to claim 1, characterized in that the field winding is connected via a rectifier to an alternating current source controlled by a choke, the control winding of which is included in the dissection of the contact wire. 3. Vidoizmenenie device PP. 1 and 2, with the fact that a static rectifier connected to an alternating current source controlled by a choke, the control winding of which is included in the dissection of the contact wire, is used as a traveling current source.