Measurement of frequency response of overhead power lines to wind

We have developed a new method which can the measure movement of overhead power lines in the wind. This method uses images from an ITV camera system. The sway of the power line is videotaped and analyzed. Its measured frequency response to wind is compared to a theoretical model and the measurement data obtained from an accelerometer. It is found that the new method yield results which are in good agreement with those obtained form the theoretical model for frequency response less than 0.5 Hz. A tension sensor and an accelerometer have been used to verify the theoretical model results. The accelerometer is used to obtain the eigenfrequency of sway. However, its results are not precise for less than 0.5 Hz. Using both the accelerometer and the new method, a method for measuring the frequency response of overhead power lines to wind, which was not previously possible, is now available.