Cooling of underground transmission lines : heat transfer measurements
Name
MIT-EL-74-003-02041054.pdf
Size
1.23 MB
Format
Adobe PDF
Checksum (MD5)
bdcb1e3c8753dc9a1fca0be1169497c1
Author(s)
Slutz, Robert Atwater
Date Issued
1974
Publisher
MIT Energy Lab
Series/Report no.
MIT-EL
74-003
Abstract
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 for 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.
Description
Forced cooling of underground electric power transmission lines, pt.1
Subjects
Underground electric lines -- Cooling
Heat -- Transmission
Persistent DSpace Link
