RU2662346C1 - Sewerage scheme of the reverse traction current at the station - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to the improvement of reverse traction circuitry. Sewerage scheme of reverse traction current at the station contains the track circuits with insulating joints and impedance bonds, grounding loop of the traction substation and suction feeder. Where the track circuits are separated with the insulating joints into the sections, which are connected between each other using the middle points of the terminals of the impedance bonds, the grounding loop of the traction substation is connected to the midpoint of the outputs of the impedance bonds via the suction feeder and to the ground, the suction feeder is made in the form of individual deep-driven earth rods, which are electrically connected to the ground loop of the traction substation and to each other through the ground.

EFFECT: reliability of power supply to traction consumers is increased and losses in the traction network are reduced.

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Description

The invention relates to traction power supply systems for railways with alternating current voltage of 27.5 kV and direct current voltage of 3.3 kV, in particular, to issues of improving sewage circuits of reverse traction current.

For electric railways, the problem of damage to the reverse current circuits of traction substations is known. Reverse current circuits are one of the important links in the traction power supply system. The use of long traction connectors (suction) in known reverse sewerage drainage systems negatively affects the operation of the traction power supply system and related devices.

The known system of power supply of electrified transport of alternating current (System of power supply of electrified transport of alternating current [Text] / A.N. Bychkov, B.I. Kosarev, G.N. Kosolapov, S.D. Sokolov, L.A. Chernousov, T. P. Dobrovolskis, E.P. Figurnov, V.P. Kruchinin, A.S. Bochev (USSR). - No. 1115940; claimed. 14.03.83; publ. 30.09.84, Bull. No. 36). The power supply system contains traction substations, interconnected by a traction network made in the form of a contact suspension, reinforcing and shielding wires, as well as rail chains. Rail circuits are divided by insulating joints into sections connected by midpoints of the terminals of the choke transformers. Traction load with one terminal is connected to the contact suspension, with the other terminal is connected to the rail chains. Between the traction substation and the contact suspension, a resonant circuit is included, containing a capacitor and an inductance connected in series, while a choke is connected in parallel with the capacitor.

Also known is the power supply system of electrified railways of alternating current (Grigoryev N.P. (RU), Krikun A.A. (RU), Sokolovsky A.I. (RU). - No. 2406624; declared. 14.12.2009; publ. 20.12 .2010, Bull. No. 35). The system contains traction substations, power transformers with terminals “a”, “b” and “c”, rail circuits with insulating joints and choke transformers, transition resistance, traction load, grounded rails, ground loops, access rails and suction air feeders , blocks of analog-to-digital converters, registration blocks, a comparison unit and a display unit, measuring current transducers.

All found analogues have the following disadvantages:

- low reliability due to the use of suction lines;

- significant losses of electrical energy in the traction network.

The closest to the claimed device, taken as a prototype, in terms of technical nature and the achieved result is a power supply system for electrified railways of alternating current (Bay Yu.M. Traction substations / Bay Yu.M., Mamoshin R.R., Pupynin V.N. , Shalimov M.G. - M.: Transport, 1986.- 319 p.). The prototype contains rail circuits with insulating joints and choke transformers, a ground circuit of the traction substation and suction feeders.

The disadvantages of the prototype is:

- low reliability due to the use of suction lines;

- significant losses of electrical energy in the traction network.

The problem solved by the invention is to create a sewage circuit of reverse traction current at the station, which allows to increase the reliability of power supply to traction consumers and reduce losses in the traction network.

To solve the problem in the scheme of reverse traction current drainage at a station containing rail circuits with insulating joints and choke transformers, a grounding circuit of the traction substation and a suction feeder, the rail circuits are separated by insulating joints into sections interconnected by the midpoints of the outputs of the choke transformers , the ground loop of the traction substation is connected to the midpoint of the terminals of the inductor-transformer by means of a suction feeder and to the ground, the suction feeder is made in the form of individual deep earthing switches, electrically connected to the ground loop of the traction substation and to each other through the ground.

The reverse traction drainage circuit at the station of FIG. one.

The reverse traction current drainage system at the station contains rail circuits 1 with insulating joints 2 and choke transformers 3, the ground loop of the traction substation 4, individual deep ground electrodes 5.

Individual deep earthing switches are connected to the midpoints of certain choke transformers. Choke transformers to be connected to individual deep earthing switches at the station are determined from regulatory requirements related to the number (length) of rail circuits located between the connection points of individual deep earthing switches.

Scheme sewage reverse traction current at the station operates as follows.

The reverse traction current from the traction rolling stock is returned to the traction substation along rail circuits separated by insulating joints, choke transformers, individual deep earthing switches and the grounding circuit of the traction substation.

The maximum effect of the application of the proposed reverse traction current drainage scheme is achieved for stations farthest from the traction substation.

Thus, for any damage in the reverse traction current drainage system at the station, the flow of reverse traction current from the rail network to the traction substation will always be guaranteed, which increases the reliability of the traction power supply system as a whole. The use of earth as an element of the passage of reverse traction current significantly reduces the resistance of the circuit as a whole, and therefore reduces losses in the traction network.

Claims (1)

The reverse traction current drainage system at the station, containing rail circuits with insulating joints and choke transformers and a suction feeder, the rail circuits being divided by insulating joints into sections interconnected by the midpoints of the terminals of the choke transformers, the grounding circuit of the traction substation is connected to the midpoint of the conclusions throttle transformers by means of a suction feeder and with ground, characterized in that the suction feeder is made in the form of individual deep earthing switches, electrically connected with traction substation grounding circuit and interconnected through the ground.

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