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- W1985133439 abstract "In order to investigate the mechanism of corona-induced vibration of H.V. conductors, a laboratory set-up was made with a conductor suspended by two pairs of springs in the center of a cylindrical mesh cage. The cage had an internal diameter of one meter and one meter length. A wide angle nozzle was used to spray the conductor with a controlled precipitation intensity. It is found that the field strength at which the vibration starts is equal to the corona onset field under rain, while the maximum amplitude of the vibration is obtained when the field strength at the surface of the conductor is equal to the corona on-set field in the presence of suspended drops without rain. In the steady state of the vibration, there is a synchronization between the motion of the conductor and the ejection of drops from the suspended drops. The frequency of the current pulses is equal to (or twice) the vibration frequency, which is the natural frequency of the system. The shape of the water drops ejected from the suspended drops is spherical at the start of the vibration, it becomes an elongated shape when the amplitude of the vibration is maximum. The vibration becomes damped when the suspended drops starts ejecting much smaller droplets. At that time the corresponding corona current contains an important d.c. component. Corona-induced vibration is excited firstly by the electrostatic forces, mainly the Coulombic repulsive forces and the reactive force due to ionic wind. The amplitude of the vibration is then amplified by the mechanical reactive force due to the ejection of drops or droplets. Corona-induced force exerted on an smooth aluminium conductor presents a maximum value of 0.14 N/m under positive applied voltage." @default.
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- W1985133439 date "1981-01-01" @default.
- W1985133439 modified "2023-10-16" @default.
- W1985133439 title "A laboratory study of corona-induced vibration of high-voltage smooth aluminium D.C. conductors in a mass-spring configuration" @default.
- W1985133439 cites W2108340681 @default.
- W1985133439 doi "https://doi.org/10.1016/0304-3886(81)90015-2" @default.
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