Horizontal cryogenic bushing for the termination of an ac superconducting power transmission line
The design and testing of a cryogenic bushing for the termination of a 138 kV 3-phase superconducting power transmission line are discussed. Three combined voltage and current bushings have been tested. Vacuum leaks and refrigerator capacity have limited the helium density attained and prevented complete voltage tests while cold; the bushings have attained satisfactory PDI and excellent impulse withstand when tested warm in SF/sub 6/. The excessive coolant flow required in the second of the three led to lengthening the temperature transition region in the third, No. 112. This bushing was run stably with currents in excess of 4 kA, and was tested at 6 kA, but without sufficient coolant flow to prevent a very slow temperature rise. The coolant flows required are 40% greater than expected. A possible cause is a radial curing void under the outer conductor which will be backfilled in the next bushing. The epoxy filler presently used results in a rather high thermal conductance, and a new formulation may be tried.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5342376
- Report Number(s):
- BNL-29950; CONF-810835-44; ON: DE82017629
- Resource Relation:
- Conference: 1981 cryogenic engineering conference, San Diego, CA, USA, 10 Aug 1981
- Country of Publication:
- United States
- Language:
- English
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Horizontal cryogenic bushing for the termination of a superconducting power-transmission line
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AC SYSTEMS
SUPERCONDUCTING CABLES
POTHEADS
DESIGN
FABRICATION
PERFORMANCE
COOLING
CRYOGENICS
EXPERIMENTAL DATA
HELIUM
POWER TRANSMISSION LINES
SULFUR FLUORIDES
CABLES
CONDUCTOR DEVICES
DATA
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELEMENTS
ENERGY SYSTEMS
EQUIPMENT
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
NONMETALS
NUMERICAL DATA
POWER SYSTEMS
RARE GASES
SULFUR COMPOUNDS
200303* - Power Transmission & Distribution- Superconducting & Cryogenic Systems- (-1989)
420201 - Engineering- Cryogenic Equipment & Devices