SU1675988A1 - Method for replacement of insulators of energized aerial power line - Google Patents

Abstract

The invention relates to power engineering and can be used for the repair of overhead transmission lines under voltage. The purpose of the invention is to simplify by reducing physical exertion on a person, increasing productivity and safety. Use a telescopic tower 1. equipped with insulating baskets 2 and rods 3, which perceive the mechanical and electrical loads of wires 4. The work is carried out through the opening in the basket 2 and from the ground using insulating ropes 15. The invention improves the power supply of consumers, shortens the search time and repairing damage to power lines, in particular with insulated neutral. 3 il. с со о vj СП О 00 00

Description

The invention relates to electric power industry, in particular, to methods for repairing overhead transmission lines under voltage.

The purpose of the invention is to simplify by reducing physical exertion on a person, increasing productivity and safety.

FIG. 1 shows a section of an overhead transmission line under voltage, on which insulators are replaced by the proposed method, a general view; in fig. 2 - insulating basket with insulating chair and stationary insulating rods, general view; in fig. 3 shows an insulating plate for separating the grounded parts of the support from the wire and insulator, a general view.

A method for replacing an overhead power line insulator under voltage is as follows.

Replacing insulators in electric networks with insulated neutral is usually necessary when the Earth appears in this electric network.

In the process of finding the Earth by known methods, at the same time a special regime is being prepared to replace defective insulators with the proposed method.

The mode includes the operational separation of the damaged section of the electrical network from the common complexly closed; transfer of consumers to electricity from a single power source in order to limit short-circuit currents.

To reduce overvoltages to a minimum, determine the capacitive current of a single-phase earth fault in the repaired area of the electrical network by the following formulas:

 T

z.yu.

E -I

ten

BUT,

where 1z.v. - total current close to the ground generated by the capacity of overhead lines, A;

1e.y - - the total current of the circuit to the Earth, created by the capacity of cable lines, A;

E - phase-to-phase voltage, kV;

I is the total length of the electrically connected network connected to the work site. Under the conditions of overvoltages, the total capacitive current to the ground must not exceed 10 A.

The setting of the overcurrent relay is converted to the maximum overcurrent protection current.

Works on replacing the insulators of an overhead power line in dry weather, relative air humidity not more than 90%, temperature (+35 - -15 ° C), wind speed not more than 5 m / s.

After carrying out regime measures, determining the places of damaged insulators, a team of electricians in insulating clothing, providing protection against step voltage and touch, proceeds to replace them. The telescopic tower 1, equipped with an insulating basket 2, on which are placed insulating rods 3, perceiving mechanical and

5, the electrical load of the wires 4, approaches the support 5. At the installation site, the telescopic tower 1 is grounded using a portable ground 6 and outriggers are installed 7. A work zone is allocated 20 m from the support where warning signs and signs are placed . The electrician rises into the insulating basket 2 of the telescopic tower 1 along a ladder or ladder 8 and is placed in it

5 in an insulating chair 9.

The telescopic tower 1 is raised to the lower wires 4, controlled by the operating rod exposed above the insulating basket 2.

0 An electrician using a bar from a safe distance (no closer than 1 m with a voltage of 10 kV line) sets a rigid insulating pad 10 and turns out the angles of collapse of insulating rods 3 from the three phases of wires 4, pulling off the spring 11. After that, he sits down on the insulating chair 9 and closes the cover 12 of the insulating basket 2. The telescopic tower 1 lifts the insulating basket 2 to a position from which it is convenient to remove the fastening of the wire 4 to the insulator 13 through the window (opening) 14 ..

Electricians from the ground using insulating ropes 15 and springs 11 supported the insulating rods 3 for wires 4 of three phases and forcing the insulating ropes 15, and the electrician who is in the insulating basket 2 fixes through the window 14 by rotating the insulating rods 3

0 the position of the wires 4 on the support 5. Then the electrician who is in the insulating basket 2, through the window 14, limiting the work area to one insulator, sets the electric shunt from

5 aluminum foil between the wire and the insulator and using pliers with insulating handles removes the wire 4 from the insulator 13, not disconnecting it from the insulator 13. The electrician on the ladder 8 is lowered from the insulating basket 2 to the ground, and the electricians on using the telescopic tower 1, the insulating rod 3 and the insulating cable 15, the ground wire 4 is removed from the insulator 13. The electrician’s exit from the insulating basket 2 is necessary in case of damage to the insulator 13 by the condition of the presence of capacitive current and wire t The cable 13 on the rod 3. The position of the wire 4 on the insulating rod 3 is fixed behind the main insulating cable 15, after which the electrician on the ladder 8 rises into the insulating basket 2 and through the window 14 replaces the insulator 13. Then the electricians remove the insulating cable from the ground 15, and the wire 4 is fed by a telescopic tower 1, an insulating rod 3 and a pull spring 11 to an insulator 13, and an electrician who is in an insulating basket 2, through a restrictive window 14, insulates the pliers with an insulating pliers. The gangway 4 on the insulator 13, from the rods 3 is removed the tension of the wires 4 and they return to their unsteady position. The replacement of the insulators of subsequent phases is carried out similarly to the described method.

The use of the present invention will improve the uninterrupted power supply of consumers, shorten the time for finding and repairing damage on overhead transmission lines, for example, with an insulated neutral.

Claims (1)

Claims of Invention The method of replacing insulators of an overhead transmission line under voltage, in which insulating ladders are installed to lift electricians to the place of work, disconnect the wires from the insulators and take them to a safe distance from the support using insulating rods. a lot of wires, after which they perform operations on the replacement of insulators, characterized in that, in order to simplify them by reducing physical exertion on a person, increase productivity, and safely labor, use a telescopic tower with an insulating basket, having openings in the side walls, and insulating rods with insulating ropes, pivotally 0 fixed on the basket of the tower, which is lifted to the wires of the line for a controlled distance, the insulating rods are brought under the wires, the insulating ropes are routed, by rotating the insulating rods 5 fix the position of the wires on the support, then install an electric shunt between the wire and the insulator through the openings of the insulating basket and remove the attachment of the wires to the insulators, not 0 they were disconnected from the insulators, after which the wires from the insulators were removed from the ground using a telescopic tower, insulating rods and ropes, then they performed the above operations to replace insulators. // eight Cll / c, fmz 13