RU2303846C1 - Supporting clamp for overhead power transmission line conductors - Google Patents

Abstract

FIELD: power engineering; supporting clamps for overhead power transmission lines.

SUBSTANCE: proposed clamp is made in the form of trough with eyes, trapezoidal dies, and U-bolts. Die length 11 is found from expression ll = (0.65 to 0.75)L, where L is total length of clamp trough. Die chute radius is greater than curvature radius of trough chute. In addition, radii R3 and R4 of trough chute bottom part can equal (0.95 to 1.2)d1/2 and (0.98 to 1.25)d2/2, respectively, and distance A between centers of radii R3, R4 can be found from expression (0.90 to 1.2) x (R4-R3), where d1 is minimal diameter of conductor being erected; d2 is maximal diameter of conductor being erected. Such new mechanical design of supporting clamp provides for specified reliability of conductor termination in trough throughout entire range of conductor diameters.

EFFECT: enhanced operating reliability of clamp over its service life.

3 cl, 3 dwg

Description

The invention relates to the field of electric power, and more particularly to supporting clamps designed for suspension and fastening of wires of overhead power lines of various voltage classes.

A support clamp for wires of overhead power transmission lines is known, comprising a boat with a groove and recesses, a suspension with ledges located in the recesses of the boat, and a wire clamping mechanism with dies made in the form of L-shaped levers, the upper shoulders of which are pulled together with a clamp; the boat is made with T-grooves in the side walls, the said levers are made with mating wave-like surfaces arranged so that the convex part of one surface corresponds to the concave part of the other surface and are oriented along the bottom of the boat trough, while the lower arms of the levers are made with cylindrical protrusions on the sides facing the side walls of the boat, located in the T-grooves of the boat [1].

This clamp, taken as one of the analogues with respect to the proposed technical solution, is very complex in its design, which leads to the complication of its manufacturing process and to increase its cost characteristics.

The closest technical solution to the proposed one is a support clip for the wires of overhead power lines, containing a boat with eyes and a groove for the wire, U-shaped tightening bolts, a die with a groove for the wire in its lower part and grooves for U-shaped tightening bolts [ 2].

Known support clamp cannot provide the required reliability of securing the wires in the clamp boat; The fact is that in this structure the supporting clamp radius R ₁ the chute ram, and the radius R ₂ of curvature of the boat trough, which fit line conductors are chosen equal, as a result of conditions securing wires of different diameters in the clamp will vary and for some diameters of wires strength embedment will be less than required; a segmented shape plate does not allow wire contact along the entire longitudinal length of the boat (the ends of the wire falling on the rounded parts of the boat are not pressed by the plate), that is, the length of the plate is not optimal and does not match the length of the contact surface of the boat; in addition, this known technical solution does not provide the specified strength of the seal of the entire range of wires mounted in the clamp. All these disadvantages limit the scope of practical application on the overhead power lines of the specified clamp.

The applicant set a specific goal: to develop a support clamp for the wires of overhead power lines, providing the normative strength of the wire in the boat and increased reliability of the clamp throughout the entire period of its operation; this positive technical result is achieved due to a new set of essential design features of the clamp, shown below in the following claims: "supporting clamp for the wires of overhead power lines, containing a boat with eyes and a groove for the wire, U-shaped tightening bolts, a die with a groove for the wire in its lower part and grooves for U-shaped tightening bolts; the die has a trapezoidal shape, the shape of its groove is made dependent on the range of wires mounted in the clamp with radius ohm R ₁ , greater than the radius R _{2 of the} curvature of the boat’s gutter by the maximum diameter d of the wire, the length of the plate l _{1 is} taken to be equal to the length l _{2 of the} contact surface of the boat, limited by the radius R ₂ , and is selected within the range l ₁ = (0.65 ÷ 0 , 75) L, where L is the total longitudinal length of the boat; the lower part of the boat trough is made with a radius R ₃ equal to (0.95 ÷ 1.2) d _1/2 and a radius R ₄ equal to (0.98 ÷ 1, 25) d _2/2, the distance A between the centers of the radii R ₃ and R ₄ is defined by the relation (0,90 ÷ 1,2) · (R ₄ -R ₃₎ wherein d ₁ - the minimum diameter of wire mounted, d ₂ - we mount the maximum diameter wow wire; at least two horizontal platforms for fastening by means of nuts with washers of U-shaped tightening bolts or for attaching a grounding device are made in the lower part of the gutter of the boat.

The invention is illustrated by drawings, where in Fig.1 is a General view of a support clip made in accordance with the present invention, a front view across the wire line; figure 2 is the same as in figure 1, a section aa in figure 1; figure 3 shows the shape of the gutter boat clamp made in paragraph 2 of the proposed claims.

The inventive support clip for securing the wires 1 overhead power lines consists of a boat 2 with eyes 3 (for example, two-armed), dies 4 and tightening U-bolts 5. The dies 4 are trapezoidal in order to ensure that it contacts only along the horizontal surface of the wire 1. Boat 2 has a groove 6 for laying wire 1 in it and on lateral tides 7 holes 8 into which the tightening U-bolts 5 are inserted, and the die 4, respectively, is made with a groove 9, with which it presses wire 1 to the groove at 6 boats by means of bolts 5. The length l _{1 of the} die 4 is determined by the length l _{2 of the} contact surface of boat 2 and is selected from the following relation: l ₁ = (0.65 ÷ 0.75) L, where L is the total longitudinal length of the boat (cm Fig. 1). The groove 9 of the die 4 is formed along the radius R ₁ , the center of which is located on the vertical axis 10 of the clamp, and this radius is chosen to be larger in comparison with the radius R _{2 of the} curvature of the groove 6 of the boat 2 by the maximum diameter d of the wire 1 mounted in the clamp (center of this radius is also located on the vertical axis 10 of the clamp).

In order to ensure the estimated strength of the termination of wires 1 in the clamp for the entire range of their diameters used on the lines, the gutter 6 of boat 2 is made according to a special profile, namely: the lower part of the gutter 6 of the boat is made with a radius R ₃ equal to (0.95 ÷ 1, 2) d _1/2, and radius R _4, equal to ((0,98 ÷ 1,25) d _2/2, the distance A between the centers of the radii R ₃ and R ₄ taken from the relation (0,90 ÷ 1,2 ) · (R ₄ -R ₃ ), where d ₁ is the minimum diameter of the wire being mounted, d ₂ is the maximum diameter of the wire being mounted.

At the bottom of the gutter 6 of boat 2, at least two horizontal platforms 11 are provided for fastening by means of nuts 12 with clamping washers 13 of U-shaped tightening bolts 5 or for fastening the grounding device 14.

The clamp is assembled and mounted on an overhead power line as follows.

Wire 1 is laid in channel 6 of boat 2, plate 4 is installed on wire 1, U-shaped tightening bolts are installed in holes 8 of lateral tides 7, clamping washers 13 are laid and nuts 12 are screwed by hand; it is necessary to ensure that the die 4 is installed symmetrically along the length of the groove 6 of the boat 2, as well as vertically, maintaining the same gaps from the walls of the boat 2; then tighten the nuts 13 with a wrench with a given torque, at which the wire termination strength is not less than the standard value. After fixing the wires in the boat 2, the clamp is attached to the elements of the insulating suspension for further lifting and fastening to the support of the overhead power line.

The proposed design of the supporting clamp for the wires of overhead power lines allows us to provide the standard (specified by the standard) sealing strength of the wire in the clamp boat, increase the reliability of the clamp during its operation for at least 25 years, and also reduce the cost of its manufacture. Currently, MZVA CJSC has launched mass production of supporting clamps of this design.

Information sources

1. USSR copyright certificate No. 1288807, cl. Н02G 7/05 from 02.08.85, publ. 02/07/87 Bul. No. 5.

2. USSR copyright certificate No. 1677758, cl. H2G 7/05 of 08/18/88, publ. September 15, 91 Bul. Number 34.

Claims (3)

1. Supporting clamp for wires of overhead power lines, containing a boat with eyes and a groove for the wire, U-shaped tightening bolts, a die with a groove for the wire in its lower part and grooves for U-shaped tightening bolts, characterized in that the plate has a trapezoidal shape, the shape of its trough is made dependent on the range-mounted terminal wires with a radius R ₁ larger than the radius of curvature R ₂ pumps trough by the maximum diameter d of wire, die length l ₁ is taken equal to the length l ₂ of the contact behavior ited boat limited radius R ₂ and is selected within l ₁ = (0,65 ÷ 0,75) L, wherein L - the total longitudinal length of the boat. 2. The clamp according to claim 1, characterized in that the lower part of the gutter of the boat is made with a radius R ₃ equal to (0.95 ÷ 1.2) d _1/2 and a radius R ₄ equal to (0.98 ÷ 1.25 ) d _2/2, the distance A between the centers of R ₃ and R ₄ is defined from the ratio of the radii (0,90 ÷ 1,2) · (R ₄ -R ₃₎ wherein d ₁ - the minimum diameter of wire mounted, d ₂ - the maximum diameter of the wire being mounted. 3. The clamp according to claim 1, characterized in that in the lower part of the gutter of the boat at least two horizontal platforms are made for fastening by means of nuts with washers of U-shaped tightening bolts, or for attaching a grounding device.

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