Investigation of conductor oscillation on the 275 kV crossing over the rivers Severn and Wye

Cable Vibrations and Control Methods

“…The vibration was observed at the mean wind speed 13-15 m/s and most of the time the mean wind direction was [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] deviated from the normal to the span. Results from extensive studies [28,29] pointed out that this unusual instability was due to the sensitivity of the drag force to the Reynolds number.…”

A unified approach to aerodynamic damping and drag/lift instabilities, and its application to dry inclined cable galloping

“…The general method presented could also potentially be used to analyse galloping of iced cables in a 3-D environment (Svensson et al, 2004), or galloping of spirally stranded cables in the absence of ice (Davis et al, 1963), using the appropriate values of the force coefficients.…”

Aerodynamic instability of long-span transmission lines

“…tape. 2 We now formulate criteria for incipient oscillation in the confluent modes. From relations 27a and b and c, we deduce the following conditions for instability of a single-span system: and/or JP|<o Pn + P:…”

“…tape over a one-mile span. 2 Self excitation does not arise (at least at low speeds) if the cables are smooth (e.g. interlocking type).…”