RU229527U1 - BIRD PROTECTION DEVICE - Google Patents

Abstract

The utility model relates to electric power engineering, namely to protective casings that provide protection of birds from contact with elements of an overhead power line, in particular insulators, sections of wires. The technical result is to prevent damage to the casing by birds and mechanical (wind) loads, as well as to prevent harm to birds by increasing the mechanical and electrical strength of the casing while ensuring the required mobility of the casing in the longitudinal and transverse directions by forming casing zones with priority properties, in particular zones responsible for strength, and zones responsible for flexibility. The essence of the utility model is that the device for protecting birds contains a corrugated casing installed on an element of an overhead power line and made in the form of a sleeve that is open in cross-section, the walls of which are formed by successively located sections of ridges and depressions connected to each other by transition sections. The thickness of at least a part of the walls of the ridge sections and the valley sections of the casing differs from the thickness of the walls of its transition sections. In this case, the casing section in the cross-section consists of a middle part and side parts adjoining it on both sides. According to the utility model, the wall thickness of the section located between the transition sections in the cross-section is made variable, and the thickness of the middle part of the section in the said section is made greater than the thickness of the side parts of the section in the same section adjoining the middle part. 3 clauses, 6 figs.

Description

The utility model relates to the electric power industry, namely to protective covers that provide protection for birds from contact with elements of overhead power lines, in particular insulators and sections of overhead power line wires.

A corrugated casing is known for protecting birds from contact with an element of an overhead power transmission line, made in the form of a sleeve that is not closed in cross-section with successively arranged sections having different cross-sectional areas of the internal space limited by the casing, with the formation of a curved ridge section in cross-section with a maximum transverse area and a curved trough section in cross-section with a minimum area, wherein the ridge sections and the trough sections are connected to each other by transition sections, the element of the electric circuit is located in the internal space of the casing, and the thickness of at least part of the walls of the curved sections of the casing differs from the thickness of the walls of its transition sections, wherein at least the curved section in cross-section consists of a middle part and side parts adjacent to it on both sides (see RU 215266 U1, published on 06.12.2022).

The disadvantages of the known casing are the low mechanical and electrical strength of the middle parts of the curved sections, thinned in comparison with the transition sections connecting them. Insufficient strength of the casing can lead to its damage under the action of, for example, wind loads. In addition, birds mainly contact the middle parts of the ridges and depressions, which are the upper parts of the casing, therefore, the thinning of the material on the said parts can lead to damage to birds due to voltage breakdown. A bird can also break through a thin wall with its claws, which can lead to the death of a bird caught in the casing or to the ingress of bird waste onto elements of the overhead power line and an increased probability of insulator breakdown.

The technical problem is to create a protective casing with increased mechanical and electrical strength, while ensuring the required mobility of the casing in the longitudinal and transverse directions.

The technical result is the prevention of damage to the casing by birds and mechanical (wind) loads, as well as the prevention of harm to birds by increasing the mechanical and electrical strength of the casing while ensuring the required mobility of the casing in the longitudinal and transverse directions by forming casing zones with priority properties, in particular, zones responsible for strength and zones responsible for flexibility.

The problem is solved and the technical result is achieved by the fact that the bird protection device contains a corrugated casing installed on an element of an overhead power transmission line and made in the form of a sleeve that is open in cross-section, the walls of which are formed by successively located sections of ridges and valleys, connected to each other by transition sections, and the thickness of at least part of the walls of the sections of the ridges and sections of the valleys of the casing differs from the thickness of the walls of its transition sections, wherein the section of the casing in cross-section consists of a middle part and side parts adjacent to it on both sides, wherein according to the utility model, the wall thickness of the section located between the transition sections in cross-section is made variable, wherein the thickness of the middle part of the section in said section is made greater than the thickness of the side parts of the section in the same section, adjacent to the middle part.

The technical result is also achieved by the fact that the wall thickness of the ridge section or the wall thickness of the depression section can be made variable.

The technical result is also achieved by the fact that the side part of the section with variable thickness can be made with a wall thickness that decreases in cross-section from the place where it adjoins the middle part in the direction of its open end.

The utility model is explained with the help of drawings.

Fig. 1 shows a corrugated casing of a bird protection device installed on an insulator;

Fig. 2 shows an isometric view from below of the casing with the longitudinal horizontal plane “A” indicated;

Fig. 3 shows a longitudinal section of the casing in plane “A” in Fig. 2;

Fig. 4 shows an isometric view from the front of the casing with the transverse vertical plane “B” indicated;

Fig. 5 shows a cross-section in plane "B" in Fig. 4;

Fig. 6 shows the shaded areas of the outer surface with variable wall thickness of the casing in an isometric view of its lower open part.

The bird protection device comprises a corrugated casing 1 mounted on an element of an overhead power transmission line (not shown in the drawings) and made in the form of a sleeve open in cross-section with successively arranged sections, the walls of which are formed by successively arranged sections 2 of ridges and sections 3 of depressions connected to each other by transition sections 4. Sections 2 and 3 can be curved in longitudinal section (as shown in the drawings) or have any other shape. Section 2, 3 and 4 of the casing in cross-section consists of a middle part 5 and side parts 6 adjoining it on both sides. In cross-section, the said sections can also have a curvilinear shape (as shown in the drawings) or any other shape. The thickness of at least a part of the walls of the sections 2 of the ridges and the sections 3 of the valleys of the casing 1 differs from the thickness of the walls of its transition sections 4 (see the section in plane "A" in Fig. 3). The thickness of the wall of section 2 and/or 3, located between the transition sections 4, in the cross section is made variable, wherein the thickness of the middle part 5 of section 2 and/or 3 in the specified section (see the section in plane "B" in Fig. 5) is made greater than the thickness of the side parts 6 of section 2 and/or 3 in the same section, adjacent to the middle part 5.

The thickness of the wall of section 2 of the ridge and/or the thickness of the wall of section 3 of the depression can be made variable.

The side part 6 of section 2 and/or 3 with variable thickness can be made with a wall thickness decreasing in cross-section from the place of connection of the side part 6 with the middle part 5 to its open end. In this case, the side part 6 in cross-section can be formed by inclined straight or curved lines.

The middle part 5 of section 2 and/or 3 can be made with a constant thickness in cross section.

The bird protection device is installed in the area where the elements of the overhead power line are located, such as insulators, electrical wire fastening fittings, etc. The mobility of the casing is required to adapt its shape to the shape of the line element or at nodal and transitional sections when changing the direction of the wire.

Casing 1 is necessary to prevent birds from being struck by electric current, as well as to protect, in particular, pin and support line insulators and adjacent sections of the overhead power line wire from the results of bird activity.

In order to ensure the greatest mobility of the corrugated casing 1, the thickness of its material is reduced in limited bending zones, for example, forming ridges and/or valleys. In particular, in the known device (RU 215266), the thickness of the material is reduced along the perimeter of the entire cross-section both in the ridge area and in the valley area. In this case, according to the ratios of quantities given in the description of RU 215266, the thickness of the thinned section with a thickness of the rectilinear (transitional) section of 1-3 mm can be (according to the limits of the interval specified in the description of RU 215266) only 0.05 mm (with 5% of the thickness of 1 mm) or 0.15 mm (with a thickness of 3 mm). Moreover, the sections of the ridge 6 and the valley 7 in the known device are made with an invariable thickness. That is, the upper part of the casing contains sections with excessive thinning. In case of a bird landing on the casing 2, it most likely rests on the sections of the ridges 6, as the most convenient (not inclined) for supporting its legs, i.e. on the thinnest sections of the casing. In such a case, the probability of an electrical breakdown increases due to the reduced electrical strength of the insulating material (casing) in the zones of probable contact with the legs of the bird and, as a consequence, the death of the bird. In addition, the bird can damage the integrity of the material in the specified zones with a smaller thickness with its claws and, unable to disengage from the casing, can also die. In this case, there remain gaps in the material through which sediment and waste products of the birds can penetrate, disrupting the normal functioning of the elements of the electric circuit and leading, for example, to an increased probability of an insulator breakdown.

In order to prevent the occurrence of the said phenomena, the thickness of the middle (upper) part 5 of the section, for example, 2 of the comb, is not reduced in the claimed casing. With such an execution of the casing, the probability of its electrical breakdown at the place of landing of the bird, as well as the violation of the integrity of the casing 1 in the said place, is reduced. But to ensure the mobility (flexibility) of the casing, the thickness of the side parts 6, which are a continuation of the middle part 5 in both directions, is reduced. Thinning the side parts increases the flexibility of the casing 1 in both the longitudinal and transverse directions. Thus, a zone is formed that is responsible for the mechanical and electrical strength exactly in the place where such qualities are necessary, namely, on the upper side of the casing 1 in its position on the element of the overhead power transmission line. The zones responsible for the flexibility of the casing 1 are located in the areas of the side parts 6. When the casing 1 is bent, its walls in the area of the location of parts 6 are stretched or compressed with less resistance due to the decrease in their thickness. In this case, the bending of the casing 1 during longitudinal bending (see Fig. 1) is carried out along its strong zone in the upper part, and the greatest bending is on its peripheral, unclosed parts, i.e., on the ends of the side parts 6. Therefore, a decrease in the thickness of the side part 6 of the wall (variable thickness) in the direction of its unclosed end is consistent with the greatest amplitude of the bending of the casing 1 on the said peripheral part. Such consistency of thickness and amplitude reduces the bending resistance without deteriorating the strength properties of the casing 1. Moreover, the longitudinal bending during installation of the device is carried out at a larger angle compared to the transverse one. But in order to increase the bending angle both in the longitudinal and transverse directions, the thickness of the middle part 5 of section 3 of the depressions can be made with a thickness smaller than the thickness of the middle part 5 of section 2 of the ridges.

Thus, the use of the described bird protection device will prevent damage to its casing by birds, as well as various mechanical, such as wind loads. In addition, it will prevent harm to birds by increasing the mechanical and electrical strength of the casing, subject to ensuring the required mobility of the casing in the longitudinal and transverse directions.

Claims (4)

1. A device for protecting birds, comprising a corrugated casing installed on an element of an overhead power transmission line and made in the form of a sleeve that is open in cross-section, the walls of which are formed by successively located sections of ridges and valleys, connected to each other by transition sections, and the thickness of at least part of the walls of the sections of the ridges and sections of the valleys of the casing differs from the thickness of the walls of its transition sections, wherein the section of the casing in cross-section consists of a middle part and side parts adjacent to it on both sides, characterized in that the thickness of the wall of the section located between the transition sections in cross-section is made variable, and the thickness of the middle part of the section in said section is made greater than the thickness of the side parts of the section in the same section, adjacent to the middle part. 2. The device according to item 1, characterized in that the wall thickness of the ridge section is variable. 3. The device according to item 1, characterized in that the thickness of the wall of the depression section is variable. 4. The device according to item 1, characterized in that the side part of the section with variable thickness is made with a wall thickness that decreases in cross-section from the place where it adjoins the middle part in the direction of its open end.

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