Fischer E (2018)
Publication Language: English
Publication Type: Thesis
Publication year: 2018
In this doctoral thesis, a new approach of a spatially-resolved diagnostic method for power cables will be introduced. Especially methods with spatial resolution are of interest due to the advantage to detect local degradations before a cable failure occurs. Therefore, a specific replacement of segments of power cables with the prognosis of a short remaining lifetime will be possible. As a consequence, unnec-essary expenses for replacement of complete cable lines and related civil engineer-ing can be saved.
This method uses travelling waves and their interference characteristics to generate local dielectric losses inside the test object. The losses can be measured and pro-vide a qualitative indication of the local physical condition of the cable insulation using a mathematical correlation with additional model calculations. The diagnos-tic method has been tested in several simulations, which are based on discretized cable models. This is followed by setting up a laboratory and field test to verify the simulation results. From this set of experiments, the most significant results will be presented. For the field application, several optimizations and first field measure-ments had to be performed with the goal of receiving boundary conditions for the operation in field environment, which will be specified in this thesis.
As future work, the field measurements will be continued to improve the results by a further development and optimization of the diagnostic method. Finally, the goal is the development of a prototype system for cable diagnosis with spatial resolu-tion. The combination of this new approach with other diagnostic methods could lead to a non-destructive and powerful diagnostic tool. In modern power networks, condition monitoring and remaining-lifetime estimation of cable grids and related equipment are necessary to maintain supply reliability, to improve investment planning and for maintenance strategy.
APA:
Fischer, E. (2018). Entwicklung und Verifikation eines mess-technischen Verfahrens zur ortsaufgelösten Evaluierung dielektrischer Eigenschaften von Energieversorgungskabeln (Dissertation).
MLA:
Fischer, Erik. Entwicklung und Verifikation eines mess-technischen Verfahrens zur ortsaufgelösten Evaluierung dielektrischer Eigenschaften von Energieversorgungskabeln. Dissertation, 2018.
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