Abstract
Partial discharge (PD) characteristics of an oil-impregnated paper insulation system with an oil gap under a lightning impulse voltage superimposed on an alternating current (AC) voltage were investigated. Prior to the voltage superimposition, insulation oil in the oil gap was degraded due to continuous PDs. Next, an AC voltage giving an electric field lower than designed one of 275 kV OF cable systems was applied to the insulation system, and then a lightning impulse voltage equivalent to switching surge voltage was repeatedly superimposed on the AC voltage. As a result, PDs progressed to continuous discharges from intermittent ones after the repeated superimposition of the lightning impulse voltage and the AC voltage. As a result, it is suggested that repeated applications of switching surge voltage may be one of the main causes of continuous PD occurrence in OF cable systems especially when insulation oil in the oil gap is degraded.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
