RU2772105C1 - Insulating traverse with rotary mechanism - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to creation of insulating crossbar for overhead power transmission line with voltage up to 220 kV inclusive and its operation in ambient temperature range from -60 °C to +50 °C. Insulating crossbar with hinged rotary mechanism consists of lower clamp, rotary mechanism, lower insulator attachment, suspension, upper clamp, bracket, lanyard, upper suspended insulator, lower support insulator.

EFFECT: invention makes it possible to exclude the effect of alternating loads, which lead to fatigue damages of linear fittings and breakage of wires, is characterized by reliability during a long period of operation in overhead transmission lines.

1 cl, 1 dwg

Description

The invention relates to the field of electric power industry, namely to the design of an insulating traverse with a swivel mechanism designed for fastening and insulating wires on supports of overhead power lines (VL) with voltage up to 220 kV inclusive, and its operation in the ambient temperature range from -60 ° C to +50°С.

Known Insulating traverse, (see the description of the utility model to the patent of the Russian Federation RU 143805 U1, IPC H01V 17/00. Published 27.07.2014 Bull. No. 21). The proposed insulating traverse of an overhead power line of 110 kV voltage class consists of a support insulator that perceives tensile loads and a support insulator that perceives compressive loads, racks and attachment points.

To ensure optimal electrical characteristics of the insulating traverse, the ratio of the insulating lengths of the insulators and are selected from the ratio: Low ref/Low ref=1.0÷4.1, where Low ref. - insulating length of the support insulator, Niz.pod. insulating length of the supporting insulator.

In the proposed utility model, the authors note that the optimal design of the traverse can be obtained by observing the ratio: Low.support./Low.under=1.0÷1.1. Taking into account that the support traverse has a larger diameter (transverse dimension) than the supporting traverse of the supporting structure, and with a relatively equal length of the supporting and supporting insulators, which follows from the ratio 1.0 ÷ 1.1, this design will be characterized by an increased weight of the traverse, which creates additional loads on the supports of the overhead power line. It should also be noted that the rigid fastening of the insulator assemblies at one end to the rack contributes to the accumulation of fatigue damage in the linear fittings, wire breakage arising from the action of the dance of wires and wind loads.

Known Insulating traverse for overhead power lines, (see Description of the invention to the author's certificate SU 1415310 A1, IPC H02G 7/20. Publ. 07.08.88 Bull. No. 29). The purpose of the invention is to improve the reliability of overhead power lines by increasing the mechanical resistance of supports to wire breaks. The proposed design of the insulating traverse for overhead power lines is attached to a reinforced concrete support, while the wires are fixed to the insulating rods using knitting in the gutters. With this method of fastening the wires, the fatigue strength of the reinforcement will decrease, due to the impact of alternating loads arising from the impact of wind loads on the wire fastening points, which, if the fatigue strength is below the permissible level, will lead to wire breakage.

Known Insulating traverse, (see the description of the invention to the patent of the Russian Federation RU 2736874 U1, IPC H02G 7/20. Publ. 23.1 1.2020 Bull. No. 33). The proposed insulating traverse for overhead transmission lines of voltage class 220 kV and above. The traverse consists of insulating structural elements and attachment points. Insulating structural elements are made in the form of a cantilever polymer insulator and in the form of two polymer insulating rods.

Rigid fastening of the ends of the cantilever polymer insulator and polymer insulating to the post of the overhead power transmission line, reduces the resistance of linear fittings to dancing, vibrations of wires arising from the effects of wind load, does not exclude wire breakage from accumulated fatigue damage when exposed to linear fittings of a sign-variable load.

The purpose of the claimed invention is to create an insulating traverse with a swivel mechanism, resistant to alternating loads, while meeting all the technical requirements that affect the reliability of an overhead power line with voltage up to 220 kV inclusive, and its operation in the ambient temperature range from -60 ° C to + 50°C.

Achievement of the technical result of the claimed invention, excluding the impact of alternating loads, leading to fatigue damage to the linear fittings and wire breaks arising from the impact of wind load on the linear fittings, is achieved by using a new design hinged swivel attachment of the traverse to the support, different from the known rigid attachment of the nodes insulators to the support post.

The insulating traverse with a hinged swivel mechanism is structurally a console of support-rod insulators. A suspension insulator is used as the upper stretched side of the traverse. A support insulator is used as the lower side of the traverse working in compression Suspension and support insulators are made of polymer modified material

The essence of the invention is illustrated by the drawing, where figure 1 shows a General view of the traverse, insulating with a hinged rotary mechanism, made in accordance with the claimed invention.

The inventive insulating traverse with a swivel swivel mechanism consists of a lower clamp 1, a rotary mechanism 2, a lower insulator mount 3, a suspension 4, an upper clamp 5, a bracket 6, a lanyard 7, an upper suspension insulator 8, a lower support insulator 9.

The claimed invention, which uses an insulating traverse with a hinged swivel mechanism for fastening to a support, has the following advantages in relation to an insulating traverse with a rigid fastening of the insulating traverse to a support, for protecting an overhead power line for voltages up to 220 kV inclusive, and its operation in the temperature range environment from -60°С to +50°С:

1. An increase in the height of the wire sag in the span due to the absence of a hanging garland of insulators and, as a result, an increase in the length of the spans, a decrease in the width of the overhead line clearing;

2. Increasing the reliability of overhead lines by increasing the insulation levels of the elements of the insulating traverse when exposed to lightning surges;

3. Reduction of bending and torsional loads on the support post due to the hinged rotary mechanism for attaching the crosshead to the support.

4. Reducing the mass of the support due to the lower mass of the traverse with a swivel swivel mechanism compared to the traditional metal traverse.

5. The main reason for the malfunction of the reinforcement in the suspension are alternating loads. Damage to linear fittings and wires of overhead lines from the action of alternating loads is of a fatigue nature. The main factors leading to fatigue damage to linear fittings and wire breakage are vibration and wire dance. First of all, the nodes that have a rigid structure for attaching the traverse to the support are destroyed from the resulting loads. In the event of a wire break, the hinged fastening of the traverse to the support determines the integrity of its insulators and the linear fittings used, due to the possibility of turning the traverse at an angle of up to 115 ° relative to the axis of the support, and as a result, restoring the operability of the overhead line in a shorter time.

The claimed invention, an insulating traverse with a hinged swivel mechanism, makes it possible to exclude the effect of alternating loads leading to fatigue damage to linear fittings and wires, due to the possibility of turning the traverse at an angle of up to 115 ° relative to the axis of the support, and moving in a vertical plane, is characterized by reliability for a long service life as part of an overhead line with voltage up to 220 kV inclusive, and its operation in the ambient temperature range from -60 ° C to + 50 ° C, compliance with all technical requirements that affect the reliability of overhead lines during long-term operation.

Claims (1)

Insulating traverse with a swivel mechanism, designed for fastening and insulating wires on overhead transmission line supports with voltage up to 220 kV inclusive and its operation in the ambient temperature range from -60 ° C to + 50 ° C, consisting of a lower clamp, a hinged swivel mounting mechanism lower insulator, upper clamp, bracket, lanyard, upper suspension insulator, lower support insulator, characterized in that the lower support insulator is attached to the rack using a hinged swivel mechanism that ensures that the traverse rotates at an angle of up to 115 ° relative to the axis of the support and moves the traverse in vertical plane.

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