Forced cooling of underground electric power transmission lines. Part I. Cooling of underground transmission lines: heat transfer measurements. Yearly report

Technical Report · Tue Jan 01 04:00:00 EST 1974

OSTI ID:7366660

Slutz, R A; Orchard, W P; Glicksman, L R; Rohsenow, W M

The heat dissipated in the conductor of a forced cooled pipe-type cable must pass through two thermal resistances in series: the conduction resistance of the cable insulation and the convection resistance due to forced and natural convection from the cable surface to the oil. The upper limit to the convection resistance was determined by natural convection heat transfer tests on a full scale model of a pipe-type cable system. It was found that conduction resistance is more than four times larger than convection resistance from cables designed for 138 kV and higher voltages. Therefore, to accurately predict the temperature inside the cable for a given oil temperature and current, a precise prediction of convection heat transfer is necessary. The solution for conduction within the cable must include effects due to cable splices and the proximity of one cable to another.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Energy Lab.
• OSTI ID: 7366660
• Report Number(s): PB-239305; MIT-EL-74-003
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
CABLES
CONDUCTOR DEVICES
CONVECTION
COOLING
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FORCED CONVECTION
HEAT TRANSFER
OIL-FILLED CABLES
POWER TRANSMISSION
UNDERGROUND POWER TRANSMISSION