Análise do risco de falha associado a métodos de controle de sobretensões de energizaçãao em linhas de transmissão compactas

Abstract

This paper analyses the risk of failure associated with control methods for overvoltages due to compact transmission-line (CTL) energization. The Approximate Statistical Insulation Coordination Method is applied diferent control methods to verify which will be very suitable for long CTL. The results are analyzed according to different devices and configurations using pre-insertion resistor, controlled switching and, transmission-line surge arrester. The software ATPDraw was used to obtain the results, where the High-Voltage (HV) systems in 500 kV with statistical switching were modeled. The results show that the smaller risks of failure are obtained with pre-insertion resistor associated with controlled switching, significantly decreasing the line-to-ground overvoltages of the CTL. Furthermore, this paper shows a study about increasing of the risk of failure associated to reduction of the insulation spacing in CTL.