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Analysis of forced cooling of compressed gas insulated transmission lines. Final report

Author
Cookson, A. H.
Published
United States : [publisher not identified], 1976.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1976.
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Kothmann, R. E. and Lapen, R. J.

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Summary
A thermal and cost analysis of forced cooling of buried, compressed gas insulated transmission lines (CGIT) was made. Only direct cooling of the sheath is considered, with water coolant flowing in aluminum pipes integrally extruded or directly bonded to the CGIT aluminum sheath. Both isolated phase and three conductor CGIT systems are considered with maximum voltage rating from 145 to 1200 kV. The lines are the designs and sizes based on present practice of self cooled systems. The CGIT lines have aluminum conductors and sheaths, and are filled with SF/sub 6/ at a pressure of 50 psig. The thermal analysis shows that cooling the sheath is an efficient technique of forced cooling CGIT lines, relying on the efficient thermal processes in the SF/sub 6/ inside the line to convey the heat from the conductor to the sheath. For a maximum sheath temperature of 60/sup 0/C, the current rating can be doubled for all voltage ratings without exceeding the maximum conductor temperature of 100/sup 0/C. Still higher current ratings are possible with reduced maximum sheath temperature at an increase in cooling system costs. The total system costs of installing buried, forced cooled CGIT lines are calculated for the isolated phase and three conductor CGIT lines for 145 kV to 1200 kV at the various current ratings. The total installed cost, including forced cooling and present worth of losses, is lower for the three conductor system by 10 percent to 15 percent at voltage up to 362 kV, and 5 percent lower at 550 kV. At higher voltages the three conductor system will be too large to be practicable.
Report Numbers
EPRI-EL-228
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
OSTI Identifier 7223522
Research organization: Westinghouse Electric Corp., Westborough, MA (USA). CGIT Lab.
View MARC record | catkey: 45072768