Title :
Statistical behaviour of GIS and GIL insulations
Author :
Finkel, M. ; Boeck, W. ; Lederle, Ch
Author_Institution :
Inst. for High Voltage Eng. & Electr. Power Transmission, Tech. Univ. of Munich, Germany
Abstract :
The statistical breakdown behaviour of SF6 and N2/SF6 insulated equipment depends on the electrode geometry, the electrode material and changing conditions at the electrode surface due to previous oxidation and breakdowns. In this context investigations were undertaken with positive lightning impulse voltage and pure SF6 in a revolvable wheel-plane gap. Comparing these test results with previous test results without rotation the breakdown distribution function is steeper. This effect is explained by a charge accumulation on the alumina layer. The test results can be used for insulation co-ordination of GIS and GIL.
Keywords :
SF6 insulation; aluminium; electric breakdown; electrodes; gas mixtures; impulse testing; insulation testing; nitrogen; sparks; Al; GIL insulations; GIS insulations; N2; N2/SF6 insulated equipment; SF6; SF6 insulated equipment; SF6-N2; alumina layer; charge accumulation; electrode geometry; electrode surface; insulation coordination; positive lightning impulse voltage; revolvable wheel-plane gap; statistical breakdown; steeper breakdown distribution function; Computational geometry; Electric breakdown; Electrodes; Gas insulated transmission lines; Geographic Information Systems; Insulation; Lightning; Oxidation; Testing; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218347
