Title of article :
Evaluation of a buried power cableʹs thermal behavior using phase diagrams and calculation of the phase difference between temperature and power
Author/Authors :
Exizidis، نويسنده , , Lazaros and Papagiannopoulos، نويسنده , , Ioannis and Chatziathanasiou، نويسنده , , Vasilis and De Mey، نويسنده , , Gilbert and Wi?cek، نويسنده , , Bogus?aw، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Abstract :
As most of the studies about thermal behavior of cables perform the steady state thermal analysis, a dynamic analysis of these problems can be proved very interesting. In the current study, a dynamic thermal analysis of an underground cable which operates under a continuously changing load and thus continuously changing Joule losses is carried out. With the Joule losses as the input signal it is proved that the thermal time constants in the range up to several hours are possible. It is also observed that the dynamic analysis, presented in this work, indicates an increase on the peak value of the cableʹs temperature that can reach up to 81%. This increase proves the importance of a dynamic analysis. Furthermore, the comparison between the steady state and dynamic analysis resulted in the conclusion that it is practically impossible to achieve steady state condition for power losses other than the mean value, thus steady state analysis cannot determine the instantaneous temperature of the cable. The analysis is based on the Temperature–Power (T–P) phase diagrams which are proved to be a more suitable representation method of the results comparing to the Temperature–Time plots. Lastly, the phase difference between the power and the temperature vectors is calculated.
Keywords :
SIMULATION , harmonic analysis , Dynamic thermal behavior , Underground cables
Journal title :
Applied Thermal Engineering
Journal title :
Applied Thermal Engineering