Abstract
The object of research in this paper is the split phase of overhead power lines. The study of the aeroelastic instability of the icy conductors of the split phase for a multi-span system has already been explored using the method of determining the Hurwitz stability criterion. In multi-span systems, where conductors are interconnected through a garland of insulators, the garlands themselves are involved in an oscillatory process. As a result of this, mutual influence of adjacent spans is observed energy is transferred from one span to another. The paper investigates the aeroelastic instability of the icy conductors of the split phase in the anchor span, which is characterized by two intrinsic features: the attachment point of conductors on the supports is fixed and mutual effects between adjacent spans are not observed. The study of motion instability is carried out by the first approximation method, that is, on the basis of linearization of the nonlinear equation at the equilibrium point and further investigation of the linearized equation in the vicinity of this point. The results of the study are based on the novelty of the carried out experiments - taking into account the peculiarities of the anchor span and the findings based on the analysis of empirical data.
Highlights
A lot of research and papers have been devoted to the study of galloping conductors [111]
The proposed calculation formula for the critical wind speed allows for an analysis of the characteristics of the air line, stationary aerodynamic coefficients of ice deposition and damping decrement on the stability of icy split-phase conductors in the wind flow
The following conclusions are drawn: 1. The value of the lower critical wind speed at which the excited galloping of the conductors is significantly affected by the frequency of the free transverse vibrations of the conductors of the split phase, the damping decrement, and the aerodynamic characteristics of the profile of the icy conductors; 2
Summary
A lot of research and papers have been devoted to the study of galloping conductors [111]. It follows from formula (9) that the lower critical speed is influenced by the damping decrement [20], the weight of the ice sediment, the frequency of natural transverse vibrations of the conductors (the characteristics of power lines), air density, geometric dimensions, and stationary aerodynamic coefficients of ice deposition. The value of the lower critical speed is not affected by the way the conductor is fixed to the support, that is, rigid anchor fastening or movable - through the garlands of insulators
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
