SU1001268A1 - Power transmission line - Google Patents

Description

The invention relates to power engineering, and more specifically to a power line with a portion of wire that forms a loop, and with a device to prevent the wire from breaking when loads exceed the calculated / and can be used for overhead power lines operated under a large range of loads on the wire (for example the northern areas of the country

Transmission lines are known, with a portion of the wire forming a loop, in parallel to which a device is installed that protects the wire from breaking. . .

Such a device is made in the form of a rigid connection. The disadvantage of it is its one-time action. When the load on the wire exceeds the rated one, the protection jumper is destroyed, and its restoration requires the intervention of repair personnel.

Known device with an elastic compensating device, EXOL1

using spring elements 23.

The disadvantage of the adaptation is the reduction of the elastic properties of the spring, up to the brittleness of the metal springs at low ambient temperatures, reaching the most northern regions of the country in terms of wire exploitation. In addition, the spring elements of the tool are in constant action, which can cause their rapid fatigue wear.

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Closest to the offer is a transmission line with a section of wire forming a loop, in parallel to which a device is installed, a safety wire

15 from a cliff, including a housing with a compensator placed in it, connected via a cable to a cable. The action of the compensator is based on compression by a piston in the case of a shock-absorbing C 33 liquid..

The damping fluid causes a number of drawbacks that make it difficult to use and operate the tool. It is known that liquids have relatively low compressibility, therefore, the movement of the movable part of the compensator for the device may not be sufficient to compensate for the loads on the wires. Operation of the .30 device is difficult due to the need to constantly have expensive depreciation fluid available and to periodically refill the device with this liquid at a height.

The purpose of the invention is to improve the reliability and operation of the device under conditions of low temperatures.

The goal is achieved T6ft, that in the transmission line with a section of wire forming a loop, in parallel with which is installed a device that protects the wire from an open circuit, including a housing with a compensator located in it, connected via a cable to the cable, glasses, turned to each other by open faces and mounted with the possibility of moving one relative to another with the formation of a closed variable chamber between them. . volume.

The drawing shows a section of the power line, a general view.

The wire section forms a loop 1, in parallel with which fixture 2 is installed, protecting the wire from an open circuit.

The device 2 consists of a cylindrical body 3, closed on both sides by covers 4. Inside the body are placed two movable one relative to the other stack a and 5 and 6, forming a closed air chamber 7. The cavities 8 of the body are depressurized. The tees of 9 glasses are rigidly fixed together with the wire 1 in the holder 10. The contact surface of the glasses is well developed and the ring seals 11 are designed to seal the chamber 7. For the same purpose, the surfaces of the steel glasses 5 and b and the body 3 should be manufactured to a high accuracy class and processed on high class purity. In the front part of the glass b a check valve with a fitting 1 is mounted.

The device works as follows.

When the load on the wires increases, the force through the holder 10 is transferred to the cups 5 and 6. The cups are consumed, the volume of the closed chamber 7 increases, the pressure in it drops. The cups move, and thus the increase in the actual length of the wire in the span ceases, the force due to the pressure difference inside and outside the chamber 7. When the load on the wire decreases, the force caused by the pressure difference exceeds the load and the glasses 5 and 6 converge.

By means of a check valve 12, it is possible to bring the glasses together both by the mechanical force applied to the glasses and by creating an artificial discharge in the chamber 7. This may be necessary both during installation and during operation of the line.

About 30% of the damage to power transmission lines in the northern regions of the country is due to the impact of climatic stress on the wires. Increasing the sag of the sag allows the voltage to be reduced in the wire at low temperatures, but leads to their shining in the summer. The use of the proposed device will allow to avoid such emergency situations and thereby increase the strength of the operation of power lines. The approximate effect of introducing the device on lines above 1000 V only at the expense of reducing repair costs may amount to 50 thousand rubles.

. The invention includes a transmission line with a section of wire forming a loop, parallel to which a device is installed that protects the wire from breakage, including a housing with a compensator placed in it, connected with a cable to a cable, characterized in that x low temperatures, compensated for in the form of two glasses, facing each other with open ends and installed with the possibility of movement one relative to another with the formation between them closed to amers of variable volume.

Sources of information taken into account in the examination

1. Author's certificate of the USSR 433580, cl. H 02 G 7/00, 1970.

2. USSR author's certificate 666600, .kl. H 02 G 7/14, 1977.

3.Avurskoe certificate of the USSR No. 542280, cl. -H 02 G 7/00, 1974.

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Claims (1)

" .Claim Power line with a wire section forming a loop, in parallel with which a device is installed that protects the wire from breaking, including a housing with a compensator placed in it, connected by wires to the wire, characterized in that, in order to increase the reliability of operation at low temperatures, the compensator is made in the form of two glasses facing each other with open ends and installed with the possibility of moving one relative to the other with the formation between them of a closed chamber of variable volume .