%0 Unpublished Work %1 bruning1991effect %A Bruning, A %A Kasture, D %D 1991 %K Insulation Life Polymer Sub-corona %T Effect of Void Sub-corona Current on Polymer Insulation Life %X Polymer 'insulations, ope:rated at voltages below critical inception voltage (CrV, corona inception voltage), sOP1c:'ltim~~ fail in a few months to a. few years, showing the same physical failure appearance as corona induced failures. Morpholog y examination of PQlyethylene (PE) indicates inhomogeneities that may provide electrical conducting paths to voids. Calculations and experiments with voltage applied to a test cell .simula.ting $uch a high 'regis .... tance conducting path in series with a 'Void' in PE were made. Chemical cha.nges on the surface wall of the voids for both corona .a.nd sub-corona (below detectable COrona, produced by voltage below Cry) currents in the void were generated. X-ray photoelectron spectroscopy (XPS) measurements of the void surface chemistry species indicate similar moieties, implying sub-corona are causing faIlures slmillir to corona insulation faIlures. The slower rate for the sub-cor6na. failure is comnstent with field failure time e~perience of a. few months to a few years. Electric field conditionsfti. vorabl~ fp.ex! stence of sub -corona. cu l'rents at relativery low. voltage ~);'e developed.

@unpublished{bruning1991effect, abstract = {Polymer 'insulations, ope:rated at voltages below critical inception voltage (CrV, corona inception voltage), sOP1c:'ltim~~ fail in a few months to a. few years, showing the same physical failure appearance as corona induced failures. Morpholog y examination of PQlyethylene (PE) indicates inhomogeneities that may provide electrical conducting paths to voids. Calculations and experiments with voltage applied to a test cell .simula.ting $uch a high 'regis .... tance conducting path in series with a 'Void' in PE were made. Chemical cha.nges on the surface wall of the voids for both corona .a.nd sub-corona (below detectable COrona, produced by voltage below Cry) currents in the void were generated. X-ray photoelectron spectroscopy (XPS) measurements of the void surface chemistry species indicate similar moieties, implying sub-corona are causing faIlures slmillir to corona insulation faIlures. The slower rate for the sub-cor6na. failure is comnstent with field failure time e~perience of a. few months to a few years. Electric field conditionsfti. vorabl~ fp.ex! stence of sub -corona. cu l'rents at relativery low. voltage ~);'e developed.}, added-at = {2020-04-02T17:49:59.000+0200}, author = {Bruning, A and Kasture, D}, biburl = {https://www.bibsonomy.org/bibtex/257a11b1ddf6d8c0dd24ef506b4a52bcc/ceps}, interhash = {fefada58b89c4bd8d46bdf1f2367b3c4}, intrahash = {57a11b1ddf6d8c0dd24ef506b4a52bcc}, keywords = {Insulation Life Polymer Sub-corona}, timestamp = {2023-12-21T14:20:51.000+0100}, title = {Effect of Void Sub-corona Current on Polymer Insulation Life}, year = 1991 }