Dynamic thermal analysis of underground medium power cables using thermal impedance, time constant distribution and structure function

The thermal behavior of a laboratory model for an underground cable has been investigated experimentally. Temperatures are recorded as a function of time so that the dynamic thermal properties could be investigated. The results are represented by thermal impedances. Two new representations, the thermal time constant distribution and the structure functions, will be introduced as well. It will be shown that with the help of a simple analytical model a lot of new information can be gained.