SU723711A1 - Aerodynamic damper of wire bouncing - Google Patents

Description

one

The invention relates to electrical engineering and can be used to protect against dangerous modes of oscillation of overhead transmission lines exposed to icy-wind loads.

An aerodynamic damper of plastic wires is known, containing elements of a certain profile, designed to be fixed on the part of the wire in span 1.

The lack of a quencher is high consumption of materials, aerodynamic drag and low efficiency.

Closest to the invention is an aerodynamic damper of a high-voltage electric power transmission line wire, containing an element made in the inside of a yarn intended to be fixed on the part of the wire in span 2.

The lack of a quencher is a significant increase in drag of the wire section with a damper (with ice deposits), difficulty in removing and melting ice on the threads and the difficulty of forming a spatial framework with an elastic thread around the wire.

The purpose of the invention is to simplify the design of the aerodynamic damper of plastic wires.

The goal is achieved by the fact that the element, made in the form of a thread, is intended to be fixed on the part of the wire in a span, made in the form of a cypical spiral, located directly on the wire with a variable pitch, performed by a random function. The thread of the specified element can be made with a variable cross-section, described by a random function, and also it can be made of magnetic material with a Curie point of 10-20 C.

The drawing shows schematically an aerodynamic damper of a flat wire, a general view.

Claims (3)

The damper gomskno gfovodov composton of the filament, 1 made in the form of a cylindrical helix, located directly on the surface of the gfovod 2. The pitch of the cylindrical helix and the cross-section of the filament 1 are variable, and imenic in a random function. The cross section of the thread may have a different shape (circle, ellipse, oval, square, etc.). A: A dynamic shock absorber plc wire works as follows. During the ice-covered season, the ice, fixed on the filament 1 and 1 of the flow 2, forms on them the surface of the extinguisher with a variable profile according to a random function. The total lifting force L of the wire section 2 with such a damper is zero, and the frontal focus D always has a certain value, i.e. . Consequently, the condition of stability of the aerodynamic hofofil according to Den-Tog is observed - °, where a is the angle of attack of the hofil; L is the lifting force of the absorber element; D is the drag of the element of the quencher; - - derivative of dtt function. Angle of attack a. The wire 2 with an absorber of flat wires is aerodynamically stable. When the wire 2 deviates from the equilibrium position, it returns to the initial position of the vertical component of the drag force. The suppression of oscillations of the driver 2 is carried out by the frontal resistance of the damper, preventing the occurrence of oscillations of the wire 2. The total damping effect in the span is ensured by the fact that the sections of the wire 2 with the damper suppress oscillations on the adjacent sections of the wire 2, reducing their amplitude, preventing development oscillations, reflection and scattering oscillatory motion. The aerodynamic damper, plastically made according to the invention, suppresses the oscillations of the wire 2. The advantage of the damper is that the ice on the wires 1 is fixed for a short time, and when melting, the ice is completely removed. In addition, the thawing and removal of ice from the filament 1 occurs due to the fact that the filament I is made of magnetic material with a Curie point temperature in the range of 10-20 ° C. At low temperatures in Vniti 1, hysteresis and eddy current losses occur, and an equilibrium temperature above 0 ° C is established on the surface, which ensures thawing and timely removal of ice. .4 In the absence of ice, the damper also kapsbal wire 2. The threads 1 change the pattern of winding the wire 2 with the wind, which will be different in each cross section of the damper. In this case, the simultaneous effect of wind on the wire 2 is impossible, and hence the oscillatory movement of the wire 2 is also impossible. Random deviations of the wire 2 are suppressed due to inequality (1), i.e. due to the vertical component of the drag force of the wire 2 with the aerodynamic damper. Consequently, the aerodynamic damper of the plastics of the wires damps the oscillations of the wire 2 both in icy and non-icy seasons of the year, reduces the consumption of materials and the wind load on the wire 2. The damper is recommended to be installed on the sections of the wire 2 in the zone 1/4, 1 / 2 and 3/4 of the span length. The dimensions of the cross-section of the filament 1 are chosen depending on the region of climatic conditions on the ice, in which the protected transmission lines are located. The pitch of the cylindrical helix of the thread, the total length of the elements of the quencher in the span is chosen taking into account the intensity of the expected plastics. The proposed aerodynamic damper of plastic wires has a simple design and is not sensitive to the angular location on the wire. Manufacturing and installing it does not require significant costs. The damper is made by winding the filament directly on the surface of the wire with random pitch of the helix. The use of the proposed aerodynamic damper with flat wires allows an increase in the efficiency of the operation of air transmission lines and gives a significant economic effect. Claim 1. Aerodynamic damper for electric conductors of power transmission lines, containing an element made in the form of a thread, intended for strengthening wire in the follet on part, characterized in that, in order to simplify the design, this element is made in the form of a cylindrical helix located directly on variable waveform, described by a random function. 2. Damper pop. 1, characterized in that the thread of the element is made with a variable cross section described by a random function. 3. A damper according to claim 1, in accordance with the fact that the element thread is made of magnetic material with a Curie point of 10-20 ° C. Sources of information taken into account in the examination 1. Author's certificate of the USSR And 390618, cl. H 02 G 7/14, 1963. 2. USSR author's certificate on ezh b5 ke N 2426212/07, cl. H 02 G 7/14, 1976.