Forced cooling of underground electric power transmission lines. Part II. Heat conduction in the cable insulation of force-cooled underground electrical power transmission systems. Yearly report

Technical Report · Wed May 01 04:00:00 EDT 1974

OSTI ID:7358182

Sanders, J V; Glicksman, L R; Rohsenow, W M

Forced-cooled systems for oil-filled pipe-type cable circuits have recently been considered. In such systems the conduction resistance through the paper insulation of the cables is the limiting thermal resistance. Assuming bilateral symmetry, steady-state conditions, and two-dimensional heat transfer, a FORTRAN IV computer program was written to solve the heat conduction problem in the cable insulation for abritrary configurations of a three-cable system. For a steel pipe, a cable system is most susceptible to overheating in the equilateral configuration with the three cables touching. Proximity effects are very significant in forced cooling, especially when cables are not provided with a copper tape under the insulation moisture seal assembly, accounting for as much as 21 percent of the total oil temperature rise between refrigeration stations. This figure, however, is reduced to 8 percent when 0.005 in.-thick copper tape is present.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Energy Lab.
• OSTI ID: 7358182
• Report Number(s): PB-239306; MIT-EL-74-004
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
CABLES
COMPUTER CODES
CONDUCTOR DEVICES
CONVECTION
COOLING
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FORCED CONVECTION
FORTRAN
HEAT TRANSFER
OIL-FILLED CABLES
PHYSICAL PROPERTIES
POWER TRANSMISSION
PROGRAMMING LANGUAGES
SIMULATION
THERMAL CONDUCTIVITY
THERMAL INSULATION
THERMODYNAMIC PROPERTIES
UNDERGROUND POWER TRANSMISSION