Suzanne Guérard

Aeolian Vibrations on Power-Line Conductors, Evaluation of Actual Self Damping

Aeolian vibrations of power lines are induced by Von Karman vortex shedding. Without dampers, the amplitude of vibration very much depends on conductor self damping, which may be very low. The purpose of this paper is to show measurements of these vibrations carried out by a new experimental device which is able to perform continuous measurements in the full range of frequencies and amplitudes. In this paper, 550 h of continuous recording on four different conductors placed in similar conditions is detailed. An evaluation of self damping power, based on observations, is proposed.

Original Real-Time Observations of Aeolian Vibrations on Power-Line Conductors

Measurements of overhead conductor vibration, caused by Von Karman vortex shedding, were carried out with a new experimental device, developed by the authors, capable of continuous monitoring of acceleration over a wide range of frequency and amplitude. Continuous real-time observations showed the important influence of wind direction and turbulence as well as some divergence in predictions of the Strouhal equation.

Power Lines Real Time Monitoring

Nowadays, the electricity demand keeps increasing. To adapt to this request, an increase in the production of electricity, as well as in transmission and distribution capacities is necessary. Whereas the construction of a new site of energy production is relatively easy, it is extremely long and difficult to manage to build new overhead lines. Consequently, electricity companies are searching for means to maximize the transport capacity of their lines while preserving the minimal distances to the ground and the mechanical reliability of the lines. Real time monitoring of the line ampacity is one of the means which make it possible to optimize the use of high voltage lines.Copyright