RU16919U1 - DEVICE FOR PROTECTING THE CONTACT WIRING FROM THE OVERBURN - Google Patents

Abstract

1. A device for protecting the contact wire from burnout, containing shielding strips fixed to the contact wire, covering it on both sides and having a profile in the lower part corresponding to the groove of the contact wire, and bolt connection of the strips, characterized in that it is equipped with an insulating unit made in in the form of tubes of various diameters mounted on a contact wire, while a tube of a smaller diameter is placed in a tube of a larger diameter on a part of its length. 2. The device according to claim 1, characterized in that the tube of a smaller diameter is placed in the tube of a larger diameter at a distance of 0.5-1.0 m, while the tube of a smaller diameter is installed end-to-end between the end of the strip and the string clip placed on the contact wire. The device according to claims 1 and 2, characterized in that the tube of larger diameter is placed at a distance of 0.5-0.7 m from the end of the strips. 4. The device according to claims 1 to 3, characterized in that the joints of the strips on different sides of the wire are made with a shift of at least two bolted joints. The device according to claims 1 to 4, characterized in that in the upper part of the strips there are protrusions providing a tight fit of the strips to the groove of the contact wire. 6. The device according to claims 1 to 5, characterized in that the total length of the strips is 5.5-6.5 m, the length of the tube with a larger diameter is 1.4-1.6 m, and the length of the tube with a smaller diameter is 5.5-6, 5 m

Description

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Device for protecting the contact wire from slopping

The proposal relates to electrified vehicles and can be used to protect contact wires from the effects of an electric arc of the runaway branch at air gaps, including when there is no voltage on the runaway branch of the contact wire.

A device is known for protecting a contact wire from burning out, comprising shielding strips fixed to the contact wire, covering it on both sides, and having a profile in the lower part corresponding to the contact wire groove and bolt connections (SU 199926.21.09.1967).

The disadvantages of the known device are the large weight of the strips and bolted connections, the complexity of installation and lack of reliability.

The technical result from the use of the proposal is the installation of light weight strips with a modified configuration, a reduction of 1.5 times the number of fasteners, which provides higher elasticity in the installation area of the chain suspension protection, reduced wear of contact wires in the specified area; increase in the structural distance between the branches of the air gap, preventing the spread of the electric arc by 30 -: - 40%, increase the reliability of the air gap.

The technical result is achieved in that the device for protecting the contact wire from burning out contains shielding strips fixed to the contact wire, covering it on both sides, and having a profile in the lower part corresponding to the contact groove

wires, and bolt connections of strips, it is equipped with an insulating unit made in the form of tubes of various diameters mounted on a contact wire, while a tube of a smaller diameter is placed in a tube of a larger diameter for part of its length. A tube of a smaller diameter is placed in a tube of a larger diameter at a distance of 0, 0 m, while a tube of a smaller diameter is installed end-to-end between the end of the strip and the string clip placed on the contact wire. A tube of a larger diameter is placed at a distance of 0.5 h-0.7 m from the end of the strips. The joints of the strips on different sides of the wire are made with a shift of at least two bolted joints. In the upper part of the strips there are protrusions providing a snug fit to the groove of the contact wire. The total length of the strips is 5.5–6.5 m, the length of the tube with a larger diameter is 1, 6 m, and the length of the tube with a smaller diameter is 5.5 –6.5.

Figure 1 presents a General view of the device. In FIG. 2 is a section AA of FIG. 1. In FIG. 3 is a diagram of an isolated air interface. Figure 4 is a top view of an isolated air interface circuit.

The device contains contact wires 1, shielding protective strips 2, covering the wire from 2 sides, bolt connections 3. The insulating assembly is made in the form of a tube 4 of a larger diameter and a tube 5 of a smaller diameter, covering the contact wire 1. The device is equipped with a connecting bracket 6 and a string clip 7. In the upper part of the strips there are two protrusions 8, which ensure a tight fit of the strip profile to the groove of the contact wire 1, when fixing the strips on the wire.

2 The device is mounted on the runaway branches of the insulating

pairing of the last third of the mast span in the direction of movement of the electric rolling stock. The protective strips 2 are installed in the transition span on the contact wires 1 of the runaway branches so that the break points of the current collector runway from the contact wire fall in the middle of the protective strips. Tube 5 is installed close between the end of strip 2 and the string clamp 7. Tube 5 is placed in the tube 4 at a distance of 0.4-1.0 m.

When placing the tube 5 at a distance of less than 0.4 m, damage to the contact wire arc in the transition zone can occur. When placing the tube 5 at a distance of more than 1 m there is an increase in the cost of the structure and its weight. The strips have a cross section of 25x4 mm and a length of up to 0.6 m or one meter each. Joints of strips on different sides of the wire are installed with a shift, i.e. on the same contact wire, the left strip is shifted relative to the right by 2 holes and reliably fixes the contact wire along the entire length of the protected zone. The total length of the strips leaves 5.5 h-6.5 m. With a length of less than 5.5 m, the tear-off point of the current collector from the contact wire may exit the protective strip zone during temperature movements of the contact wire. With a length of more than 6.5 m, the structure becomes heavier and more expensive.

The length of the tube 4 of large diameter is 1.1 -: - 1.6 m. With a tube length of less than 1.1 m, the device does not provide reliable operation due to the possibility of burning the contact wire and its slipping out of the protective strips. With a tube length of 1.6 m there is an unreasonable weighting and rise in price of the structure. The length of the smaller diameter tube 5 is 5.5-6.5 m. With a length of

a tube less than 5.5 m does not protect the contact wire from burning out in the longitudinal direction of the wind (along the rolling stock). With a tube length of more than 6.5 m, an unreasonable rise in the cost of the structure occurs.

The tube of larger diameter is spread; hen is at a distance of 0.5 h-0.7 m from the end of the strips. When the tube is placed at a distance of 0.4 m, the contact wire can burn out and slip out of the protective strips. When placing the tube at a distance of more than 0.7 m, an unreasonable rise in price and weighting of the structure occurs. All of the above ratios of wire sizes (E, yen experimentally at an operating voltage of 3 kW and currently operating electric rolling stock.

For the simultaneous operation of both contact wires in the separation zone of the current collector skid from the contact wires, connecting brackets 6 are installed between the contact wires every three meters.

In order to increase the reliability of the air gap operation, the strings of the chain suspension supporting the contact wire 1 located in the transition zone must be insulated with 5, and the structural height of the chain suspension in this zone must be more than 2 meters. In the case of a lower structural height above the strips, a safety shunt U is installed from the ЕССМ 70 wire, connected to the supporting cable with single bolt connecting clamps, which are installed on the supporting cable from below every 0.5 m.The length of the shunt is 8 m.

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Claims (6)

1. A device for protecting the contact wire from burnout, containing shielding strips fixed to the contact wire, covering it on both sides and having a profile in the lower part corresponding to the groove of the contact wire, and bolt connection of the strips, characterized in that it is equipped with an insulating unit made in in the form of tubes of various diameters mounted on a contact wire, while a tube of a smaller diameter is placed in a tube of a larger diameter on a part of its length.  2. The device according to claim 1, characterized in that the tube of a smaller diameter is placed in the tube of a larger diameter at a distance of 0.5-1.0 m, while the tube of a smaller diameter is installed end-to-end between the end of the strip and the string clip placed on the contact wire.  3. The device according to claims 1 and 2, characterized in that the tube of larger diameter is placed at a distance of 0.5-0.7 m from the end of the strips.  4. The device according to claims 1 to 3, characterized in that the joints of the strips on different sides of the wire are made with a shift of at least two bolted joints.  5. The device according to claims 1 to 4, characterized in that in the upper part of the strips there are protrusions providing a snug fit of the strips to the groove of the contact wire. 6. The device according to claims 1 to 5, characterized in that the total length of the strips is 5.5-6.5 m, the length of the tube with a larger diameter is 1.4-1.6 m, and the length of the tube with a smaller diameter is 5.5- 6.5 m.