An anti-galling torsional eddy current mass damper and its optimization method

Abstract

The invention belongs to the technical field of overhead transmission lines, and particularly relates to an anti-dancing torsional eddy current mass damper and an optimization method thereof. The scheme of the invention is based on the in-depth study of the three-degree-of-freedom dancing of wires and the mass damper, passively controls the torsional vibration of the wires by using the mass damper, uses a metal disk as a mass unit, uses a torsional spring as a stiffness unit, and uses a permanent magnet as a damping unit. The scheme of the invention fully utilizes the characteristics of the three-degree-of-freedom dancing of split wires, well avoids the problem that the vertical vibration control needs to provide a large amount of motion space of the mass unit by adopting a method of controlling the torsional vibration, and can control the low-frequency dancing of the lines in a small size.

Description

technical field [0001] The invention belongs to the technical field of overhead transmission circuits, and in particular relates to an anti-galling torsion steering eddy current mass damper and an optimization method. Background technique [0002] With the increase of the transmission voltage level of transmission lines, multi-split conductors are widely used. The galloping of multi-split wires is usually accompanied by torsional vibration, and the torsional motion has a significant impact on the galloping of multi-split wires. Galloping will cause damage to hardware and flipping of wires, which will cause great harm to transmission lines. Improving the damping of the torsional direction of the transmission line can increase the energy consumption when the conductor is galloping, effectively inhibit the generation and development of the conductor galloping, and thus improve the safety performance of the transmission line. [0003] At present, ultra-high voltage and ultra-h...

AI Technical Summary

Problems solved by technology

[0003] At present, ultra-high voltage and ultra-high voltage lines usually use measures such as phase-to-phase spacers, phase-to-ground spacers, damping spacers, detuned pendulums, and eccentric weights to suppress conductor galloping. The phase-to-phase spacers and phase-to-ground spacers have been used in practice and have achieved certain results. effect, but the above-mentioned spacers are limited by the application scenarios, the former is suitable for compact lines, and the latter requires the line to have a small distance from the ground

The damping spacer optimizes the connection between the spacer and the wire, and reduces the force on the spacer when the wire dances, thereby increasing the durability of the spacer, but the suppression of galloping is not significant

In addition, the above three anti-dance measures still lack more in-depth theoretical research

Other anti-galling measures, such as detuned pendulums and eccentric weights, have theoretical support, but they have also been found in actual line applications. Under certain conditions, they will fail and may even lead to greater galloping amplitude of the line.

[0004] The galloping mechanism of multi-split conductors is complex, and the galloping frequency of large-gage lines is low

Torsional mass dampers have a wide range of application scenarios, are less restricted by line conditions, have clear theoretical support, and are convenient for engineering applications and parameter optimization. However, there are no literature reports and practical applications for anti-galling torsional dampers.

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