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Assessing the risk of failure due to particle contamination of GIS using the UHF technique

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3 Author(s)
Sellars, A.G. ; Rolls Royce Ind. Power Group, Hebburn, UK ; Farish, O. ; Hampton, B.F.

The ultra high frequency (UHF) technique has been used to study the partial discharges produced by free conducting particles in gas insulated substations (GIS) with a view to predicting the probability of particle-triggered breakdown. Statistical techniques have been developed to describe the motion of a single particle. It is possible to identify whether the particle is capable of crossing to the busbar, which is a necessary condition for particle-triggered breakdown. In addition, the technique can be used to assess the size of the particle, which is useful for making a qualitative assessment of the breakdown risk. The implications for the continuous discharge monitoring of GIS are discussed

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:1 ,  Issue: 2 )