High temperature gas-insulated systems
Abstract
The economic impact of, and the technical requirements for, high temperature operation (140 C) of SF6 insulated transmission lines are analyzed. Optimized design computer programs incorporate the present worth cost of losses. The cost of losses makes it uneconomic to raise the conductor temperature beyond about 110 C. For the same reason forced cooling is not attractive for steady operation. High temperature operation and forced cooling are attractive for operating flexibility by allowing higher short term loading. Components for high temperature operation were developed and tested. These are insulators, conductor joints, and spiral welded enclosures. A 9 m (30 ft.) long section of a 362 kV prototype was built and tested in three modes of installation, open air, covered trench, and direct burial. The steady state and transient ampacity for high temperature operation were measured and compared with calculated data. Thermal radiation accounts for about 15% of the conductor enclosure heat transfer.
- Publication:
-
Final Report Gould-Brown Boveri
- Pub Date:
- August 1980
- Bibcode:
- 1980gbb..rept.....D
- Keywords:
-
- Gas Cooling;
- Gas Heating;
- Heat Transfer;
- Insulation;
- Transmission Lines;
- Computer Programs;
- High Temperature Tests;
- Sulfur Fluorides;
- Thermal Insulation;
- Fluid Mechanics and Heat Transfer