Title :
Negative LI breakdown behavior of electrodes with thin dielectric coatings in dry air at high pressure
Author :
van der Born, D. ; Morshuis, P.H.F. ; Smit, J.J. ; Girodet, Alain
Author_Institution :
DC Syst. & Storage, Delft Univ. of Technol., Delft, Netherlands
Abstract :
In gas insulated switchgear(GIS) SF6 gas is widely in use because it has good electrical insulation and arc interruption capabilities. Due to environmental constraints the desire to use alternative gases is continuously growing. This paper focuses on dry air as an alternative gas which unfortunately has a breakdown strength which is lower than the breakdown strength of SF6 at equal gas pressure. To improve the breakdown strength of dry air filled GIS, dielectric coatings can be applied to the electrodes. In this paper, the performance of GIS with thin coatings is evaluated through breakdown tests in a rod-plane electrode arrangement. Negative lightning impulse voltage is applied on the rod electrode and the gas pressure is kept constant at 0.9 MPa.
Keywords :
SF6 insulation; arcs (electric); dielectric materials; electrodes; gas insulated switchgear; insulating coatings; switchgear testing; GIS SF6 gas; arc interruption capability; breakdown strength; breakdown tests; dry air filled GIS; electrical insulation; environmental constraints; equal gas pressure; gas insulated switchgear; high pressure; negative LI breakdown behavior; negative lightning impulse voltage; pressure 0.9 MPa; rod electrode; rod-plane electrode arrangement; thin dielectric coatings; Coatings; Dielectrics; Electric breakdown; Electrodes; Sulfur hexafluoride; Surface treatment; GIS; breakdown; dry air; lightning impulse; thin coating;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2014 IEEE Conference on
Conference_Location :
Des Moines, IA
DOI :
10.1109/CEIDP.2014.6995738
