| Autor: |
Joachim Schiessling, Birgitta Källstrand, Markus Saltzer, C. B. Doiron, Daniel Borg, Kenneth Johansson |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena. |
| DOI: |
10.1109/ceidp.2013.6748310 |
| Popis: |
Even under corona-free conditions, insulating structures (materials) may be charged in DC fields. This is due to the fact that air has a finite ionic conductivity. The finite conductivity of air results from charges generated by background radio activity and cosmic radiation. Typical ion concentrations on ground are 107 to 1010 ions/m3 which leads to conductivities ranging from 10-16 to 10-13 S/m. An experiment has been conducted where the end of a terminated high voltage XLPE cable was used as an insulating structure. The field distribution around the stripped cable end was measured with an applied DC voltage of -140 kV using a rotating field probe. The measurements are compared to simulations, which do not specifically take into account space charge effects. A big discrepancy is observed, showing the relevance of taking into account space charge effects when modeling HVDC insulation components subjected to air. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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