SU1592184A1

SU1592184A1 - Apparatus for electric power supply of a.c.rail ways

Info

Publication number: SU1592184A1
Application number: SU884462817A
Authority: SU
Inventors: Aleksandr N Artyukh; Teodoros P Dobrovolskis; Aleksandr B Kosarev
Original assignee: Mo I Inzhenerov Zheleznodorozh
Priority date: 1988-07-18
Filing date: 1988-07-18
Publication date: 1990-09-15

Description

The invention relates to electrified2

railways and can be used to power the contact network of feeder zones. The purpose of the invention is to reduce the electromagnetic effect on the communication line. The device consists of a contact suspension 1, a reinforcing wire 2, a partitioned shielding wire 3 and a track circuit with insulating joints with controlled nonlinear inductance. Traction current flows through the track circuit to the nearest choke transformers and further along the shield wire, thereby reducing the electromagnetic effect on the communication lines. 1 il.

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The invention relates to electric transport, in particular to the traction network of electrified AC railways.

The purpose of the invention is to reduce the electromagnetic effect on the communication line.

The drawing shows the circuit diagram of the device.

The device includes a contact suspension 1, in parallel which is connected a reinforcing wire 2, a partitioned shielding wire 3 and an insulating joint 4 with a choke transformer 5. On the partitioned wire 3, the supports 6 of the contact network are grounded. Between the zero points of the left and right windings of a choke transformer, one winding 7 of a transformer is connected, the other winding 8 of which is connected to a dc source 9 through normally open contacts of a voltage relay 10, the first and second inputs of which are connected respectively to the left 11 and right 12 rails of an insulated joint four.

The device works as follows.

When an electric locomotive is in the feeder zone, the current to it flows from the traction substation through the contact suspension 1 and the reinforcing wire 2, returns along the rails to the throttle transformers 5 nearest to its left and right, and then flows into the screening cable sections 3, s which flows back into the rails at the next isolated junction 4, etc., up to both traction substations.

Thus, in the sections in which the reverse current flows in the shield wires, the protective actions of the shield wire will be greatest, and in the sections in which the reverse current flows in the rails, only the induced component of this current will be in the shield wire.

To ensure electrical safety, a voltage relay is connected in parallel with the insulated junction. In case of exceeding the permissible electric voltage condition of a relay

it triggers and closes its contacts in the winding circuit 8, through which the direct bias current starts to flow, the core of the transformer enters into saturation,

₅ which leads to a decrease in the resistance of the winding 7, which is a nonlinear inductance. As a result, the voltage at the isolating junction decreases, the voltage relay 10 is again triggered, which opens the circuit with its contacts

By constant biasing, the resistance of the nonlinear inductance 7 increases and the device returns to its original state.

The device allows to reduce the electro-15 magnetic effect on adjacent communication lines and extended metal structures by increasing the shielding coefficient of the shielding wire.

Claims

Claim

20

Device for supply AC railways, comprising a contact system with a reinforcing wire, a shield wire connected to the GCO ₂₅ ramie catenary track circuit with insulating joints and throttle transformers, characterized in that, to reduce the electromagnetic influence on the communication line, it is equipped with elements with nonlinear inductance, each 30 of which is made in the form of a two-winding transformer, one winding of which is included in the splitting of the jumper between the zero points of the left and right The coil is a choke transformer, and the other is connected to a DC power source through normally open contacts of a voltage relay, the first and second inputs of which are connected respectively to the left and right rails of the insulating joints, while at the insulating joints the shielding wire is made sectioned and connected to the left end of each section to the zero point of the left winding, and the right end to the zero point of the right winding of the nearest choke transformer.