Summary
Future HVDC power transmission systems faults may lead to transient overvoltages of types not covered by present HVDC cable type tests. Among these are the so-called Temporary
Read more Read lessOvervoltages (TOVs), characterized by a very slow front and long tail transient superimposed on a dc voltage. To clarify to what extent HVDC cable grade XLPE insulation withstands such
TOVs, the maximum withstand field of 0.3- and 0.5-mm thick samples was determined during
TOVs of different front and decay times. The 234 samples tested included samples with small contamination particles inserted to emulate defects in the insulation. The samples without particles showed an impressive dielectric strength, up to 600 kV/mm. The samples with contamination particles suffered breakdowns at considerably lower fields, most of them in the range 250–350 kV/mm. More important, no substantial differences in dielectric strength were observed between the different TOVs, even though the front time ranged from 0.25 ms (as in a standard switching impulse) to 10 ms.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B1_11849_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Norway |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
RUNDE Magne - SINTEF Energy Research; LINHJELL Dag - SINTEF Energy Research; HESTAD Øystein - Norwegian University of Science and Technology; MERMIGKAS Atanasios - SINTEF Energy Research; LESAINT Cedric - SINTEF Energy Research; THINN Kristian S. - SINTEF Energy Research; SÆTERNÆS Hans H. - SINTEF Energy Research; DOEDENS Espen - Nexans Norway; JUVIK Jon I. - Statnett
Keywords
Cross-linked Polyethylene – Dielectric Strength – HVDC – Temporary Overvoltage
