Self-cleaning damping unit for intra-phase spacers of overhead power lines

Abstract

FIELD: electric power engineering.SUBSTANCE: invention relates to a device for a damping unit of intra-phase remote blind damping spacers of split-phase wires of overhead power transmission lines, intended for protection against sub-oscillations of the wire in the spans of the line transmitted to the structure of the spacer. The technical problem solved by the present invention is the elimination of obstacles to the removal of ice and the increase in the reliability of the damping unit. The damping unit of the remote spacer of the split-phase wires of the overhead power transmission line comprises elastomeric disks of an elliptical shape, located on both sides of the spacer beam in recesses of the corresponding shape and fixed with a bolted connection through pressure caps resting with brackets on the spacer frame. According to the invention, the pressure cover is provided with three differently directed brackets installed in corresponding support recesses on the spacer frame, with the formation of windows between the brackets and the ends of the pressure cover and the spacer frame of the windows into the internal space of the damping unit. The recess of the spacer is made with a height not less than the size of the gap between the cover and the spacer beam. In addition, the outer surface of the elastomeric disc is designed with a reverse taper at the base of the disc.EFFECT: creating a damping unit design that has self-cleaning properties from ice, as well as an increase in the reliability of fixation of the elastomeric damping element.2 cl, 6 dwg

Description

[0001] The invention relates to electric power engineering, in particular to a device for a damping unit of intra-phase remote blind damping spacers of split-phase wires of overhead power transmission lines, intended for protection against sub-oscillations of a wire in line spans transmitted to the structure of the spacer.

[0002] The prior art discloses damping units in spacers-dampers of split-phase wires of an overhead power transmission line.

[0003] According to patent RU 2655679, a damping spacer for overhead power transmission line wires is known. It consists of a housing in the form of a three-dimensional frame formed by vertical and horizontal ribs. Integrated into the frame are cups housing damping units consisting of two or more toroidal-shaped rubber damping elements. The damping elements are connected by at least two plates per damping unit using special fasteners (fine-threaded bolts, washers, and solid metal self-locking nuts).

[0004] When oscillations (sub-oscillations) occur, the rubber damping elements are deformed and the vibration energy of the wires is spent on overcoming (compensating) the internal deformations of the material, for example, the special rubber of the damping elements of the damper units, which makes it possible to dampen the vibrations of the split-phase wires that occur on overhead power lines.

[0005] According to patent RU2375800, a damper spacer is known. It consists of an aluminum housing, three movable cast arms with clamping plates and bolts for fastening to split-phase line wires, and three damper assemblies by which they are secured to the spacer body. The damper assembly consists of two elastomer discs (torsion bars) located in a housing socket, a cover, and a tightening bolt and nut. The damping characteristics of these assemblies are achieved through the optimal selection of a material with the required properties for the elastomer discs. Furthermore, it is also important to ensure the correct tightening of the elastomer discs in the damper assemblies with a torque value that ensures optimal absorption of the wire vibration energy.

[0006] The above-described analogs possess good damping properties, ensuring effective suppression of sub-oscillations of split-phase wires in overhead power transmission line spans. However, the device's normal operation, with these advantages, is ensured under normal operating conditions, without the extreme presence of adverse environmental factors such as liquid precipitation, snow, ice, and high levels of sand, mud, and salt deposits. The internal cavity of the damping unit's strut housing is exposed to all of these environmental elements and prevents self-cleaning. The greatest limitation to the strut beam mobility and, consequently, vibration damping is the freezing of water leaking into the cavity.

[0007] The same factor of icing of the internal cavity of the damper unit is an obstacle that complicates easy dismantling and repair.

[0008] Freezing of ice with expansion in a closed volume with practically vertical surfaces leads to repeated cyclic action of an unforeseen load on the walls of the glass, which potentially increases material fatigue and reduces service life, which has not yet manifested itself due to the relatively short period of operation.

[0009] Also known from the prior art is a solution presented in US Patent No. 4,242,537, selected by the applicant as the closest prior art. This solution comprises two elastomer damping elements located on either side of a strut beam and pressed together by caps on both sides using a bolted connection passing through a through axial hole in the damping elements and the strut beam. The damping elements are oval-shaped, unlike the annular shape of the elements described in similar patents RU 2655679 and RU 2375800.

[0010] An elastic element with a non-circular shape, flat edges, and a constant cross-section in the uncompressed state allows for the compensation of both high-frequency, low-amplitude vibrations and low-frequency, high-amplitude vibrations. A gap between the covers and the strut beam allows for elastic compensation of longitudinal vibrations without transmitting force to rigid structural elements.

[0011] The recesses in the strut beam and in the covers follow the oval shape of the damping elements. As the strut beam rotates, the oval recesses in the beam and the oval recesses in the covers rotate in opposite directions. This creates an asymmetric deformation of the outer surface of the oval damping elements, leading to the destruction of the ice layer in the gap between the cover and the strut beam in the direction of the strut beam axis.

[0012] However, the broken ice fragments are not effectively removed from the area between the spacer beam and the cover, since the part of the structure opposite the elongated part of the oval surface of the damping element is covered by a cover fragment. The remaining ice is compacted and compacted in this area rather than chipped and removed. Subsequently, the remaining ice refreezes again and interferes with normal damping. The closed design of the cover and housing is critical for self-cleaning.

[0013] Furthermore, in the design of the closest analogue, the contact surface area of ​​the recesses for placing the damping element is significantly smaller than the total surface area of ​​the damping element, which, under impact radial effects on the damping unit, possible in various operating modes of the line - including in the normal switching mode, can lead to the damping element slipping out of the recess with subsequent jamming of the damping unit.

[0014] The technical problem solved by the present invention is to eliminate obstacles to removing ice and to increase the reliability of the damping unit.

[0015] The technical result is the creation of a damping unit design that has self-cleaning properties from ice, as well as increasing the reliability of fixation of the elastomeric damping element.

[0016] The claimed technical result is achieved in that in the damping unit of the remote spacer of the split-phase wires of an overhead power transmission line, containing elastomeric disks of elliptical shape, located on both sides of the spacer beam in recesses of the corresponding shape and fixed by a bolted connection through pressure caps, supported by brackets on the spacer frame, according to the invention, the pressure cap is provided with three differently directed brackets installed in corresponding support recesses on the spacer frame, with the formation between the brackets and the ends of the pressure cap and the spacer frame of windows into the internal space of the damping unit, the recess of the spacer beam is made with a height not less than the value of the gap between the cap and the spacer beam.

[0017] In addition, the outer surface of the elastomer disc is designed with a reverse taper at the base of the disc.

[0018] The design improvement is free access to the space limited by the pressure covers due to the gap between the pressure covers and the spacer frame, as well as three multidirectional brackets on the covers installed with support on the frame.

[0019] Increasing the number of brackets allows for a smaller cross-section of each bracket, and consequently, an increased window area in the damping unit. When using three brackets, the cross-section of each bracket, which provides the required mechanical strength, is close to square.

[0020] The window-shaped design provides free access to the interior of the damping unit, eliminates obstacles to ice chipping, and ensures the device self-cleansing from ice.

[0021] In addition, with possible longitudinal displacements of the wire, due to the use of three brackets (instead of two in the prototype), the cover evenly absorbs the load without creating a rotational moment around the A-A axis (Fig. 1), which eliminates the possibility of the clamping cover being turned out.

[0022] Making a recess in the strut beam with a height not less than the gap between the cover and the strut beam ensures reliable fixation of the elastomer damping disk when impact dynamic loads are applied to the strut beams and prevents the elastomer disk from slipping and jamming.

[0023] For the same purpose, the outer surface of the elastomer disc, unlike its closest analogue, is designed with a reverse taper at the base of the disc. This is especially important in conditions of significant cold and a decrease in the elastic properties of the rubber.

[0024] Thus, the strut is more reliable in operation in emergency modes, when impact loads occur, and has the property of self-cleaning from ice formed from moisture penetrating into the internal space of the damping unit.

[0025] The essence of the claimed invention is explained by the images, where Fig. 1 shows a strut, general view; Fig. 2 - a damping unit, general view; Fig. 3 - a strut frame, general view; Fig. 4 - a strut beam, general view; Fig. 5 - a pressure cover of the damping unit, general view, where view (a) shows a general view of the cover from the inside, view (b) shows a general view of the cover from the outside; Fig. 6 - a damping unit, section A-A.

[0026] The following item numbers are used in the figures shown above:

[0027] 1 - spacer frame,

[0028] 2 - strut beam,

[0029] 3 - elastomer disc,

[0030] 4 - damping unit pressure cover,

[0031] 5 - fastener (bolt with nut),

[0032] 6 - brackets,

[0033] 7 - support recesses of the strut frame.

[0034] The damping unit for the spacer of the split-phase conductors of an overhead power transmission line (Fig. 6) comprises elastomeric disks 3 of an elliptical shape. By elliptical disk shape, the applicant understands a disk shape that has an ellipse in cross-section or a similar shape elongated in the direction of one axis, for example, an oval shape.

[0035] Elastomeric discs 3 are located on both sides of the beam of the strut 2 in recesses of the corresponding shape. On the side of the elastomeric discs 3, pressure caps 4 are located, equipped with three brackets 6, two of which are located in opposite directions, and the third is located between them, wherein the brackets 6 are made with a support on the frame of the strut 1, provided with corresponding support recesses 7. Pressure caps 4 are designed to form windows into the internal space of the damping unit between the brackets 6 and the ends of the pressure cap 4 and the frame of the strut 1.

[0036] The recess of the beam of the spacer 2, in which the elastomeric discs 3 are installed, is made with a height not less than the value of the gap between the pressure cover 4 and the beam of the spacer 2.

[0037] The damping unit works as follows.

[0038] When oscillations (sub-oscillations) occur, elastomer disks 3 are deformed, and the energy from the wire vibrations is expended to overcome (compensate) the internal deformations of the material. Damping occurs due to the deformation of the elliptical elastomer disk 3 under the influence of counter-rotating recesses of a corresponding shape, formed on the clamping caps 4 and the arms of the spacer 2.

[0039] When the elastomer discs are damped, their surface deforms, cracking and chipping any ice on the rubber surface through the gaps between the covers and the openings formed by the clamping cover brackets and the ends of the cover and strut frame. This allows for free self-cleaning of the cavity around the damping elastomer discs.

Claims

1. A damping unit for a remote spacer for split-phase wires of an overhead power transmission line, comprising elastomeric disks of elliptical shape, located on both sides of the spacer beam in recesses of the corresponding shape and secured by a bolted connection through pressure caps resting with brackets on the spacer frame, characterized in that the pressure cap is provided with three differently directed brackets installed in corresponding support recesses on the spacer frame, with the formation between the brackets and the ends of the pressure cap and the spacer frame of windows into the internal space of the damping unit, the recess of the spacer beam being made with a height not less than the value of the gap between the cap and the spacer beam.

2. The damping unit according to paragraph 1, characterized in that the outer surface of the elastomeric disk is made with a reverse taper at the base of the disk.

Images