RESEARCH AND PROTECTION OF ENERGY TRANSMISSION LINES FROM THE FERRORESONANCE OVERVOLTAGES

Abstract

This paper focuses on ferroresonance overvoltage in energy transmission lines. Ferroresonance is an oscillation in a non-linear series resonance circuit, which shows overvoltage and overcurrent waveforms with significant distortion. The high voltage equipments may be damaged due to dielectric and thermal problems of Ferroresonance. One of the problems of energy transmission lines is that they need to be protected from ferroresonance overvoltage. In this article, the overvoltage of energy transmission lines is investigated. In order to abolish the overvoltage the ways of using reactors in the beginning and at the end of energy transmission lines are shown. A very comprehensive analysis is performed using time domain simulations with ATP (Alternative Transient Program). Simulation results reproduced satisfactorily the ferroresonant events recorded during the field tests in the 500 kV. energy transmission lines. A number of mitigation options are discussed.