Lapped insulation for a superconducting power transmission line
The development of a suitable polymeric tape for use as insulation on ac superconducting cables is a challenging engineering problem for the designer of plastic films. No commercially available tape simultaneously fulfills all of the electrical, mechanical and thermal requirements without modification. Porous, paper-like tapes produced electrically weak cables. Uniaxially oriented polyolefin tapes were found to have tensile properties superior to the nonoriented types, but these materials often fibrillated during cooldown to operating temperature. Further studies showed that commercially produced, 32 ..mu..m-thick, biaxially oriented polypropylene tapes had acceptable tensile properties at both 4.2 and 293 K. The desired tape thickness of 66 ..mu..m and 100 ..mu..m were obtained by laminating two or three layers together with a 2.0 ..mu..m-thick polyurethane adhesive. The loss tangent and permittivity of this laminate meets design considerations. Biaxial orientation was also found to reduce thermal contraction and increase the 4.2/sup 0/K elongation of the polypropylene films. Work has been started to develop a very high modulus, single layer polyethylene tape for use with higher voltage superconducting cables.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 6349611
- Report Number(s):
- BNL-25454; CONF-7810152-1
- Resource Relation:
- Conference: 5. symposium on superconducting power transmission, Upton, NY, USA, 5 Oct 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRICAL INSULATION
ELECTRICAL PROPERTIES
MECHANICAL PROPERTIES
SUPERCONDUCTING CABLES
FILMS
HVAC SYSTEMS
POLYETHYLENES
POLYPROPYLENE
POWER TRANSMISSION LINES
UNDERGROUND POWER TRANSMISSION
AC SYSTEMS
CABLES
CONDUCTOR DEVICES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
EQUIPMENT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
POLYMERS
POLYOLEFINS
POWER SYSTEMS
POWER TRANSMISSION
200303* - Power Transmission & Distribution- Superconducting & Cryogenic Systems- (-1989)
420201 - Engineering- Cryogenic Equipment & Devices