PDC designed a distribution
cable test site in the Arizona desert to evaluate buried cable
temperatures and ratings. The effects of mutual heating at cable
crossings and on risers was also studied.
A key part of the project was
to evaluate cable crossings. Various thermal models have been
developed over the years for cable crossings, but experimental data is the
best way to evaluate the mutual heating effects. An intensive array
of thermocouples were placed at various locations near and on the cables
to measure temperatures.
In addition to evaluating
buried cables, one goal of the project was to study the temperatures of
cables on risers. Various types of conduit systems and protection
schemes for risers are applied at utilities. A configuration common
to Arizona Public Service's distribution system was used. Arizona
Public Service and DSTAR sponsored this project.