RU168019U1 - SUPPORT INSULATOR - Google Patents

Abstract

The utility model relates to the field of electric power industry, in particular to supporting insulators for power substations and overhead power lines. The insulator is a spatial structure in the form of a hollow body 1. The lower part 2 of the housing 1 is open, and the upper thickened part 3 has threaded holes 4. In the inner cavity of the housing 1 of the insulator there is a rod 5 with an internal longitudinal threaded hole 6 for the fastening element 7, made in the lower part of the rod 5 to a height of not less than 5% of the construction height of the insulator. At least two vertical stiffeners 8 are made between the rod 5 and the housing 1, extending along the entire height of the insulator from its base to the upper thickened part 3. A protective ribbed sheath 11 can also be molded from the organosilicon composition on the outer side surface of the housing 1. The mechanical loads acting on the insulator are perceived by the insulating body 1 of the insulator. When the forces act on compression and tension, the strength of the housing 1 is determined by its cross-sectional area and the strength of the material. The installation of vertical stiffeners 8 greatly increases the moment and efficiency of use of the material, and the transfer of the attachment point of the insulator to a height of at least 5% of its building height leads to a decrease in the impact load. The introduction of the proposed support insulators into the practice of electric grid construction will allow us to provide significant savings in material and production costs while maintaining their strength and operational characteristics. 3 ill.

Description

The utility model relates to the field of electric power industry, in particular to supporting insulators for power substations and overhead power lines.

Known reference polymer insulator containing the end parts with metal reinforcement, interconnected by an insulating body, while the metal reinforcement is made in the form of fasteners mounted on the end parts of the insulator, the perimeter of each of which is made of insulating protrusions [1].

However, this reference polymer insulator has significant disadvantages:

- high consumption of materials on the insulating casing (the casing is made in the form of a continuous insulating body) to provide the necessary strength of the insulator under the action of bending loads, as well as torsion, compression and tensile loads;

- all types of acting mechanical loads are applied to the end sections of the insulating casing and, therefore, the strength of the insulator will be largely determined by the strength of the sealing of the metal reinforcement. For example, the bending moment acting on the insulator is actually determined by the bending force, and the shoulder of its impact is almost equal to the construction height of the insulator. As a result, when exposed to bending loads, the outer side of the insulator body (opposite to the direction of action of the bending force) will work in tension, and the inner, respectively, in compression. Under these conditions, the achievement of the required bending strength of the insulator is ensured, as a rule, due to the large cross-sectional area of the housing (body of revolution), which ultimately leads to an increase in the mass (weight) of the insulator.

Also known is a support composite insulator made in the form of a spatial structure of insulating molding material, containing a hollow body with an open lower part and an upper thickened part having at least one threaded hole for fastening live parts, a central rod with an internal longitudinal hole with a thread for a mounting bolt made in the upper part of the hole of the rod at a height of at least 0.5 of the building height of the insulator, while between the central rod and the housing at least four oriented radially vertical stiffeners passing along the entire height of the insulator from its base to the upper thickened part [2].

In this insulator, an attempt was made to reduce the mass (weight) by replacing a solid (monolithic) body with a hollow cylinder while maintaining its strength characteristics with hollow structures with vertical stiffeners and transferring the insulator attachment point from its lower to the upper. Nevertheless, this goal has not been fully achieved, since even the minimum number of vertical stiffeners (four) used in the insulator significantly increases its mass, and the transfer of the insulator attachment point from its lower part to the upper is made to an insufficient height (not less than 0.5 construction height of the insulator), which reduces the strength of the entire structure.

The applicant solved the problem of developing a supporting insulator with a small mass, but with high strength electrical characteristics, which reduces material consumption, labor intensity in manufacturing and improves the reliability of the insulator in adverse atmospheric conditions by replacing solid (monolithic) bodies and pipe structures with partitions and fillers with hollow constructions with vertical stiffeners and transfer of the insulator attachment point from its lower to upper part. The set of essential structural features of the proposed support insulator, providing the above-mentioned positive technical result, is given in the following utility model formula: “support insulator made in the form of a spatial structure of insulating material, containing a hollow body with an open lower part and an upper thickened part having at least at least one threaded hole for fastening current-carrying elements, at least one rod with an internal longitudinal hole with thread "under the fastener, made in the lower part of the rod to a height of not less than 5% of the building height of the insulator, while at least two vertical stiffeners are made between the aforementioned rod and the body, extending along the entire height of the insulator from its base to the upper thickened part."

The invention is illustrated by drawings, where in FIG. 1 shows a main view with a cut along the vertical plane of a support insulator made in accordance with the present utility model; in FIG. 2 is a view along arrow A in FIG. one; in FIG. 3 is a view along arrow B in FIG. one.

The inventive support insulator is a spatial structure made of an insulating material, for example, by casting from glass-filled polyamide in the form of a hollow body 1 in the form of a truncated cone, cylinder or in the form of a hollow geometric figure with an oval in cross section having constant or variable dimensions along the height of the insulator . The lower part 2 of the housing 1 is open, and the upper thickened part 3 has threaded holes 4, designed to provide fastening of current-carrying elements connected to the insulator (not shown). In the inner cavity of the insulator housing 1, a rod 5 passes with an internal longitudinal threaded hole 6 for a fastener (bolt) 7, made in the lower part of the rod 5 to a height of at least 5% of the insulator's building height.

At least two vertical stiffeners 8 are made between the rod 5 and the housing 1, extending along the entire height of the insulator from its base to the upper thickened part 3. On the stiffening ribs 8, vertical protrusions-thickenings 9 can be provided, having threaded holes 10, which are designed for additional fastening of the insulator to the supporting structures.

To prevent contamination and humidification of the insulator, the inner space between the rod 5 and the inner surface of the housing 1 can be filled with low-density insulating foam-forming material. On the outer side surface of the housing 1 by means of vulcanization can also be molded protective ribbed shell 11 of an organosilicon (silicone) composition. From below, the insulator housing 1 can be closed with a cover (not shown) also to prevent contamination and wetting the inner surface of the housing 1.

The utility model works as follows.

The mechanical loads acting on the insulator are perceived by the insulating body (body 1) of the insulator. Under the influence of forces on compression and tension, the strength of the insulating body 1 is determined by its cross-sectional area and the strength of the material. But for supporting insulators the determining factor is their ability to withstand bending moments, and the moment of inertia of the insulating body depends not only on its cross-sectional area, but also on the configuration of the insulating body. It is known that the annular cross section of the body has a moment of inertia several times larger than the moment of a circle with their same area. The installation of vertical stiffeners 8 greatly increases the moment and efficiency of use of the material. The bending moment is determined by the magnitude of the force applied to the upper part 3 of the insulator housing 1 and the distance (shoulder) from the point of application of force to the attachment point, therefore, transferring the attachment point to a height of at least 5% of the insulator's construction height reduces the acting load. The fastening element 7 creates a preliminary compression stress in the housing 1 and the stiffening ribs 8 of the insulator, contributing to an increase in its stability under the influence of tensile forces arising on the external (relative to the direction of the force) insulator part. An additional fastening of the insulator, carried out by screws in the threaded holes 10 of the protrusions-bulges 9 stiffeners 8, is provided only for insulators exposed to torques.

The manufacture of the insulator is carried out, for example, by injection molding on injection molding machines in one step and does not require assembly operations, with the exception of vulcanization of the protective shell 11 for insulators designed for use in outdoor conditions with contamination and moisture.

The introduction of the proposed insulators into the practice of electric grid construction will allow us to provide significant savings in material and production costs while preserving their strength and operational characteristics.

Information sources

1. Description of the invention to the patent of the Russian Federation “Supporting polymer insulator” No. 2130660, class НВВ 17/14, 17/02, claimed July 26, 1996, published May 20, 1999.

2. Description of the invention to the patent of the Russian Federation “Composite support insulator” No. 2372681, class Н01В 17/14, claimed on 10/30/2008, published on 10/11/2009.

3. Description of the invention to the copyright certificate “Support insulator” 819824, class Н01В 17/14, priority 03.04.79, published 07.04.81

Claims (1)

A support insulator made in the form of a spatial structure made of insulating material, comprising a hollow body with an open lower part and an upper thickened part having at least one threaded hole for attaching live parts, at least one rod with a threaded inner longitudinal hole for a fastener made in the lower part of the rod to a height of at least 5% of the building height of the insulator, while at least two vertical ribs made between the aforementioned rod and the body stkosti extending over the height of the insulator from the base to the upper thicker portion.

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