Self‐excited vibrations of overhead transmission lines

Nonlinear Free Vibrations of Coupled Spans of Overhead Transmission Lines

The weakly nonlinear, freely vibrating motion of a system of coupled spans of suspended overhead transmission lines is studied. It is shown that the natural vibration is the gravity mode, of which the unsteady tension component vanishes in the first harmonic. The problem was born out of a study of the phenomenon of galloping, which is a high amplitude periodic oscillation of overhead transmissi...

Power transmission capacity upgrade of overhead lines

Electric power consumption, has been increasing uninterruptedly, being this increase specially accelerated in the last years. New power generators are been built, the installed power increases each year, thus it is necessary a way to transmit the bulk energy. Nowadays electric lines are saturated, they are reaching critical values of ampacity and sag. Therefore building new lines is necessary t...

Design and selection criteria for HVDC overhead transmission lines insulators

Using the Energy Balance Method in Estimation of Overhead Transmission Line Aeolian Vibrations

Original scientific paper This paper considers using the Energy Balance Method for estimation of overhead transmission line Aeolian vibrations. Since the damper’s efficiency strongly depends on its position, the procedure of determining the optimum position of the damper is described. It is observed that the optimal damper position depends on the span length also and that the best results can b...

Transmission expansion planning based on merchandizing surplus of transmission lines

This paper proposes an optimal transmission expansion planning (TEP) which is based on determining share of each line in merchandizing surplus (MS) of system, determining by Independent System Operator (ISO). The more share of a line in MS of system denotes the priority of a line for expansion. The procedure of determining MS of each line in a power system is based on determining the MS share o...