Abstract
It is assumed that imperfections in XLPE cable insulation is the limiting factor concerning ac breakdown strength. The other main hypothesis is that volatile byproducts from the crosslinking process will have a healing effect when the XLPE insulation contains imperfections. In order to simulate real cable insulation containing contaminants a Rogowski type test object has been developed. This test object consists of a Rogowski-shaped piece of XLPE insulation compression moulded between two sheets of semiconducting screens. The ground screen was equipped with a thin aluminium sheet while the ac high voltage was applied with a brass electrode. A thin XLPE sheet made it possible to insert small inclusions inside the XLPE insulation. Both spherically and irregularly shaped inclusions made of glass, copper, or iron have been inserted within the test objects. The short-term and long-term ac breakdown strength have thus been measured. The detrimental effect of conductive spheres was small, but the conductive irregular particles had a large detrimental effect. The short-term ac breakdown strengths were 60 and 30% of the breakdown strength of test objects without any artificial inclusions for test objects containing spherically and irregularly shaped particles, respectively. The diffusion coefficients for both acetophenone and cumylalcohol in XLPE
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Citation Formats
Hagen, S T.
AC breakdown strength of XLPE cable insulation. The effect of artificial inclusions and byproducts from the cross-linking process.
Norway: N. p.,
1993.
Web.
Hagen, S T.
AC breakdown strength of XLPE cable insulation. The effect of artificial inclusions and byproducts from the cross-linking process.
Norway.
Hagen, S T.
1993.
"AC breakdown strength of XLPE cable insulation. The effect of artificial inclusions and byproducts from the cross-linking process."
Norway.
@misc{etde_10142757,
title = {AC breakdown strength of XLPE cable insulation. The effect of artificial inclusions and byproducts from the cross-linking process}
author = {Hagen, S T}
abstractNote = {It is assumed that imperfections in XLPE cable insulation is the limiting factor concerning ac breakdown strength. The other main hypothesis is that volatile byproducts from the crosslinking process will have a healing effect when the XLPE insulation contains imperfections. In order to simulate real cable insulation containing contaminants a Rogowski type test object has been developed. This test object consists of a Rogowski-shaped piece of XLPE insulation compression moulded between two sheets of semiconducting screens. The ground screen was equipped with a thin aluminium sheet while the ac high voltage was applied with a brass electrode. A thin XLPE sheet made it possible to insert small inclusions inside the XLPE insulation. Both spherically and irregularly shaped inclusions made of glass, copper, or iron have been inserted within the test objects. The short-term and long-term ac breakdown strength have thus been measured. The detrimental effect of conductive spheres was small, but the conductive irregular particles had a large detrimental effect. The short-term ac breakdown strengths were 60 and 30% of the breakdown strength of test objects without any artificial inclusions for test objects containing spherically and irregularly shaped particles, respectively. The diffusion coefficients for both acetophenone and cumylalcohol in XLPE insulation and semiconductor screen material was measured. Such data are of great importance in order to achieve appropriate degassing and impregnation time for Rogowski test objects and cable insulation. 53 refs., 64 figs., 20 tabs.}
place = {Norway}
year = {1993}
month = {Jul}
}
title = {AC breakdown strength of XLPE cable insulation. The effect of artificial inclusions and byproducts from the cross-linking process}
author = {Hagen, S T}
abstractNote = {It is assumed that imperfections in XLPE cable insulation is the limiting factor concerning ac breakdown strength. The other main hypothesis is that volatile byproducts from the crosslinking process will have a healing effect when the XLPE insulation contains imperfections. In order to simulate real cable insulation containing contaminants a Rogowski type test object has been developed. This test object consists of a Rogowski-shaped piece of XLPE insulation compression moulded between two sheets of semiconducting screens. The ground screen was equipped with a thin aluminium sheet while the ac high voltage was applied with a brass electrode. A thin XLPE sheet made it possible to insert small inclusions inside the XLPE insulation. Both spherically and irregularly shaped inclusions made of glass, copper, or iron have been inserted within the test objects. The short-term and long-term ac breakdown strength have thus been measured. The detrimental effect of conductive spheres was small, but the conductive irregular particles had a large detrimental effect. The short-term ac breakdown strengths were 60 and 30% of the breakdown strength of test objects without any artificial inclusions for test objects containing spherically and irregularly shaped particles, respectively. The diffusion coefficients for both acetophenone and cumylalcohol in XLPE insulation and semiconductor screen material was measured. Such data are of great importance in order to achieve appropriate degassing and impregnation time for Rogowski test objects and cable insulation. 53 refs., 64 figs., 20 tabs.}
place = {Norway}
year = {1993}
month = {Jul}
}