Abstract
Ultra-high-voltage transmission line is prone to severely aeolian vibration, especially for the large crossing span. However, few studies were conducted previously, as a result of high nonlinearity...
Highlights
Ultra-high-voltage (UHV) transmission lines show unique advantage for long distance and large capacity transmission of electric energy, especially for countries where the energy consumption areas are thousands of kilometers away from the energy producing areas.[1,2,3] Compared with lower voltage transmission lines, UHV lines have more sub-conductors in one phase bundle and with higher conductor hanging points, which makes the UHV conductors be more prone to damages resulting from wind-induced vibration
Plenty of studies have been conducted on aeolian vibration of traditional transmission lines, there is a clear lack of research on the UHV conductors, especially for the eight-bundle conductors used at long crossing spans
This article focuses on the aeolian vibration characteristics and suppression methods for the eight-bundle 1000 kV UHV conductor of large crossing span
Summary
Ultra-high-voltage (UHV) transmission lines show unique advantage for long distance and large capacity transmission of electric energy, especially for countries where the energy consumption areas are thousands of kilometers away from the energy producing areas.[1,2,3] Compared with lower voltage transmission lines, UHV lines have more sub-conductors in one phase bundle and with higher conductor hanging points, which makes the UHV conductors be more prone to damages resulting from wind-induced vibration. Aeolian vibration is one of the most dangerous kinds of vortexinduced vibration (VIV) of overhead transmission lines, with the frequencies of 3 to 150 Hz and amplitude of less than the diameter of a conductor occurring at a wind speed of 0 to 7 m/s.2–5 It is a main cause for fatigue failure of stranded conductors and ground wires. Long crossing spans, the critical section of transmission line, are much easier to be threatened by aeolian vibration than ordinary spans of the same line This is because the large crossing span has a longer span length, higher conductor suspension points, and more steady laminar wind, as it leads to more wind energy input onto the conductor and the conductor vibrates in a wider frequency range. Plenty of studies have been conducted on aeolian vibration of traditional transmission lines, there is a clear lack of research on the UHV conductors, especially for the eight-bundle conductors used at long crossing spans
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