SU366995A1 - aoESOg ^^ liloi adk. G. MarquardtPyT? YTiS-TEHSH1 ^ 'E1 (A ^ | LIBRARY' ^ \ i - Google Patents

Description

one

The invention relates to the field of electric power transmission to locomotives on mainline electrified railways of direct current and is intended mainly for the economical strengthening of power supply systems for direct current roads, as well as for use in the electrification of new, especially single-track lines.

With a conventional power supply system of an electric direct current rail line from a 110 or 220 kv transmission line, step-down transformers of traction substations are powered, the secondary side of these transformers is connected to 10.5 kv buses. These buses have a connecting transformer, which, through a rectifier, supplies the contact network with direct current with a voltage of 3.3 kV. A contact network consists of the actual contact suspension and a reinforcing wire connected in parallel by means of transverse connections.

A three-phase transmission line with a voltage of 10.5 kV is located on the field side of the contact network support. As a rule, the cross section of the wires of this line is small, since it does not feed low-power consumers of low power.

When consumed by an electric rolling stock of high power, the total cross section of the contact suspension and reinforcing wires is not enough for reliable and economical operation of the power supply system.

The aim of the invention is to increase the capacity of the power supply system of electric railways of direct current.

This is achieved by using simultaneous transmission of electricity over the wires of the direct and alternating current lines, for which the reinforcing wire of the contact network is combined with a three-phase transmission line of 10.5 kV, i.e., a three-phase transmission line is actually performed with a total cross section wires and a three-phase line of 10.5 sq.

FIG. 1 shows a power supply circuit of an electric railway including a three-phase direct current line and a feed point; in fig. 2 - the same with boosters to increase the voltage in the contact network; in fig. 3 is a three-phase circuit with a compensating winding.

Three-phase direct current line 1, combining the functions of the amplifying wire and the three-phase transmission line, located on the contact network supports, is powered, as in the known systems, from busbars 2 traction substations with a voltage of 10.5 square meters. From the same bus 2 power traction transformers

3 and straighteners 4, which feed the electric unit 7 through the contact suspension 5 and the rail circuit 6.

Line / is connected to the contact suspension 5 through the bullet points of three-phase chokes 8. In the middle of the feeder zone, feed point 9 is arranged, i.e., a single-unit intermediate link substation is installed with its traction transformer having the derived zero point of the primary winding. No boom consumers are fed, as in previously known commercial networks, through a transformer 10.

Instead of the feed point 9, it is possible to install booster devices (boosters) // included in the cuts of the contact network 12 and 13 (Fig. 2) to increase the voltage in the middle part of the feeder zone. These so-called boosters have a transformer with the zero point of the primary winding connected to the contact suspension.

To eliminate the closure of boosters through chokes 8, diodes 14 are connected to the zero chains of the latter. Throttles 8 (see Fig. 3) have a main winding 15 and a compensating winding 16, which is connected at one end to a DC contact suspension 5. To reduce or By completely eliminating the magnetization of the cores of the throttles, you can apply, for example, a "zigzag" winding connection circuit.

In the three-phase-direct-current network, the electric rolling stock of the direct current is supplied from the 3.3-kW direct current substations either directly through the contact suspension 5 or through a line / three-phase-constant current connected in parallel to the contact suspension through the zero points of three-phase chokes or primary windings of transformers. To perform parallel work, it is sufficient to have three such connections in the feeder zone.

In addition, locomotives also receive power from a spike of 2 t-boom substations with three-phase alternating current of 10.5 kV through feed points 9 or boosters 11, or both together along the same line / three-phase direct current. On the same line / receive power three-phase and single-phase no govye consumers.

The three-phase-direct current network reduces the energy losses in the wires, increases the voltage level of the direct and alternating current consumers, and reduces the number of wires located on the supports of the contact network. When reinforcing existing electric railways

a three-phase DC network allows the intermediate substation to refuse to power from the 110-kV transmission line or, while electrifying new lines, increases the distance between the main substations.

Subject invention

A three-phase DC network, containing a DC contact suspension and a three-phase distribution network fed from AC busbars of a traction substation, is characterized in that, in order to increase the voltage on the current collectors and reduce power losses, the contact suspension and the distribution network are interconnected in parallel through three-phase chokes with zero leads.

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