High ampacity potheads
Abstract
Three methods are evaluated for achieving higher pothead ampacities using one cable per phase and without any major modification in the pothead's dielectric design features or use of a larger cable conductor size. Topics discussed include: (1) pothead designs that are based on maintaining a subambient temperature in the oil dielectric within the potheat porcelain insulator to obtain an increase in ampacity over a self-cooled rating; (2) a pothead design that utilizes the core zone of a hollow core conductor cable to transfer the major heat energy developed by the cable conductor 12R losses to an air heat exchanger located at the high voltage end of the pothead, and (3) the influence of three different types of low viscosity oils on the thermal characteristics of the pothead designs.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- October 1975
- Bibcode:
- 1975STIN...7624496N
- Keywords:
-
- Electric Current;
- Electric Terminals;
- Transmission Lines;
- Design Analysis;
- Dielectrics;
- Electrical Insulation;
- Oils;
- Performance;
- Electronics and Electrical Engineering