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Ampacities of underground electric power cables in the presence of external forced cooling

Journal Article · · IEEE Trans. Power Appar. Syst.; (United States)
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This paper presents a method of computing the ampacity of underground cables that are cooled by external pipes carrying a coolant. The method utilizes conduction shape factors and an effective thermal resistivity which represents the presence of both the surrounding soil and the cooling pipes. When used in place of the native soil resistivity, the effective resistivity value will produce the same cable temperatures as would exist when a cable is buried near external cooling pipes. The effective resistivity value can therefore be used in ampacity tables or existing ampacity programs, thereby extending their application to cases that involve forced cooling. While the method developed is applicable to any cable and cooling pipe geometry, three different cable geometries are examined in detail. An experimental horizontal three-cable/two-pipe system was used to verify the results obtained from the mathematical analysis. The predicted effective thermal resistivities for this system were used in an ampacity program and the resulting conductor temperatures were within a maximum of 3.4 degrees Celsius of the experimentally measured temperatures for conductor temperatures up to 105/sup 0/C.

Research Organization:
School of Mech. Engineering, Georgia Inst. of Technology, Atlanta, GA 30332
OSTI ID:
5935640
Journal Information:
IEEE Trans. Power Appar. Syst.; (United States), Journal Name: IEEE Trans. Power Appar. Syst.; (United States) Vol. PAS-101:10; ISSN IEPSA
Country of Publication:
United States
Language:
English

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Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
CABLES
CALCULATION METHODS
CONDUCTOR DEVICES
COOLANTS
COOLING
EFFICIENCY
ELECTRIC CABLES
ELECTRIC LOGGING
ELECTRICAL EQUIPMENT
EQUIPMENT
PIPES
POWER TRANSMISSION
RESISTIVITY LOGGING
SOILS
UNDERGROUND POWER TRANSMISSION
WELL LOGGING