Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear
- 1 March 2016
- journal article
- Published by IOP Publishing in Plasma Science and Technology
- Vol. 18 (3), 247-253
- https://doi.org/10.1088/1009-0630/18/3/06
Abstract
Very fast transient over-voltage (VFTO), induced by disconnector operations in gas-insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the experimental results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.Keywords
This publication has 9 references indexed in Scilit:
- Influence of O2 on the dielectric properties of CO2 at the elevated temperaturesPhysics of Plasmas, 2014
- Experimental Research on Suppressing VFTO in GIS by Magnetic RingsIEEE Transactions on Power Delivery, 2013
- Development of Full Frequency Bandwidth Measurement of VFTO in UHV GISIEEE Transactions on Power Delivery, 2013
- Arcing Model of a Disconnector and its Effect on VFTOPlasma Science and Technology, 2013
- Experimental Research on Very-Fast Transient Overvoltage in 1100-kV Gas-Insulated SwitchgearIEEE Transactions on Power Delivery, 2012
- 3D Full-Maxwell Simulations of Very Fast Transients in GISIEEE Transactions on Magnetics, 2011
- Prediction of dielectric properties of N2/O2mixtures in the temperature range of 300–3500 KJournal of Physics D: Applied Physics, 2004
- Suppression of VFT in 1100 kV GIS by adopting resistor-fitted disconnectorIEEE Transactions on Power Delivery, 1996
- Disconnect Switch Induced Transients and Trapped Charge in Gas-Insulated SubstationsIEEE Transactions on Power Apparatus and Systems, 1982