In order to increase power flow in existing thermally limited transmission lines, the
maximum allowable operating temperature of the line’s conductors has been pushed to high levels. Lines built 40 years or more ago to be operated at 50oC to 75oC are being re-specified to temperatures in excess of 150oC. Connector failures, clearance violations, and acceleration of normal material degradation can ensue.
Quantify the various detrimental effects (conductor creep elongation, annealing of aluminium, connector degradation) of high temperature operation on existing transmission line conductor systems. Conventional conductors, connectors and hardware will be included. Emphasis will be
upon extended operation at temperatures above 100oC.
Incorporate references to previously published Electra papers on annealing, creep elongation, and sag-tension as well as the recent IEEE Guide 1283.