Abstract
Very Fast Transient Overvoltages (VFTO) might result in insulation failures inside or outside Gas Insulated Switchgears (GIS), and most of them are led to by the spacer flashovers in the light of operational experiences. To get a better understanding of the discharge process, an experimental study on spacer flashovers under nanosecond-pulses in compressed Sulphur Hexafluoride (SF6) gases is presented. A solid-state pulse generator, SPG200N, is used to generate nanosecond-pulses with a rise time of 15 ns and a full width at half maximum of 30-40 ns. The pulse repetition frequency (PRF) varies from 1 Hz to 1 kHz. The material of spacer is epoxy resin, a common material as insulators in GIS. The test electrodes are brass parallel-plane electrodes, 80 mm in diameter, to simulate uniform field in GIS. In this research, the relations of flashover time lag with gas pressure and PRF are investigated. The experimental results show that the flashover time lag gradually rose with the increase of gas pressure under single shot and lower PRF.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.