Aging Model and Parameter Determination for High Pressure Gas Cables at Elevated Electro-Thermal Stresses

MSc thesis of Devayan Basu

Numerous High Pressure Gas Cables (HPGC) had been laid decades back by TenneT TSO, transmission grid operator of the Netherlands and parts of Germany. Now, when TenneT decided to replace or increase the loadings on such cables, the question appears how would they behave to such temperature profiles and also the progress of their aging under such conditions. The whole research has been divided into 3 sub questions, where Fast, Short-Term Ramps as well as long term Step AC stress Tests were conducted on the samples; Polarization-Depolarization Current Measurements, Frequency Dielectric Spectroscopy and Partial Discharge Characterization was carried out on the Aged and Unaged Samples. Utilizing extensive statistical algorithms, trends were observed for all the parameters obtained from the models’ fitted on the measurements of the experiments, indicating the dielectric degradation with thermal aging.

https://tudelft.zoom.us/j/3194798383