Electric Field Modelling in Gas-Insulated Substation for Analysis of Conditions for Partial Discharge Phenomena
B. Florkowska a, P. Zydroń a and A. Jackowicz-Korczyński b
aAGH - University of Science and Technology, Department of Electrical and Power Engineering, al. Mickiewicza 30, 30-059 Kraków, Poland
bStator Service Polska, al. Roździeńskiego 188, 40-203 Katowice, Poland
Received: January 3, 2015; In final form: August 6, 2015
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The paper refers to diagnostics problems connected with the presence of partial discharges in gas-insulated substation. The basic stimulus for partial discharges generation is local, high value electric field, greater than the inception one. The numerical simulations of the electric field distribution in the part of the gas insulating system and in the vicinity of the metallic protrusion located on high voltage conductor are presented. Such defects are often present in SF6 insulated constructions and are the cause of a local increase of the electric field. Theoretical analysis of physical mechanism of partial discharges initiation and development in the case of micro-needle type defects is described.

DOI: 10.12693/APhysPolA.128.319
PACS numbers: 51.50.+v, 52.80.-s, 84.70.+p, 41.20.-q