Modeling, Analysis & Mitigation of VFTO in GIS

Abstract

The increase in demand for electricity and the growing energy density in urban area have made it necessary to extend the existing high voltage network right up to the consumer. For these, Gas Insulated substation has been developed which consume minimum space, exibility from environmental in uences, high reliability, minimum maintenance, exible operation and for future development to meet the present day requirements. The power system should be reliable. One of the major reason of power system interruption is due to insulation failure because of ver fast transient over voltages in the power system. These overvaoltages has very steep rate of rise time. VFTO phenomenon is greatly affected in gas insulated substation and this effect is observed at most of the components in gas insulated substation. The major source of VFTO is operation of disconnector switch or isolator. The main objective of this project is to perform modeling and simulation of VFTO in Gas Insulated Substation as well as analysis of VFTO across different equipments and to propose its mitigation techniques and compare the different techniques. Gas Insulated Substation has been modeled and simulated using EMTP-RV.