Authors: | Niedik, Christoph Felix Jenau, Frank Maricanov, Michail Segiet, Dominik Tiller, Jörg Christian Katzenberg, Frank |
Title: | Improvement of high voltage direct current material properties upon tailoring the morphology of crosslinked polyethylenes |
Language (ISO): | en |
Abstract: | Crosslinked linear low-density polyethylene (XLPE) is the most common polymeric cable insulation material for high-voltage applications with a high number of operating hours in high voltage alternating current (HVAC) systems. High voltage direct current (HVDC) power transmission and polymeric cable systems play a major role in the future and raise, besides numerous systemic benefits, challenges in the design of material properties. The main issue is injection and trapping of space charges in insulation materials under DC-fields. The objective of this work is to increase knowledge of the interplay between microstructure and material performance of XLPE under DC by tailoring its morphology beyond the capabilities of “common crystallization kinetics” upon constrained crystallization at certain elongations. It was found that the tailored oriented morphology influences the energetic depth of traps and a significant reduction of space charge density occurs. Moreover, the optimized oriented morphology leads to a significant reduction of field enhancement for field strengths ELaplace ≥ 20 kV mm−1 compared to unoriented XLPEs with spherulitic morphology. It is shown that this way of morphology tailoring results in a considerable, material dependent reduction of field exposure by a factor of 4, which promises a significant improvement in the electrical life time of polymeric insulation material used. |
Subject Headings: | HVDC Morphology tailoring Polymer insulation Space charge phenomena |
URI: | http://hdl.handle.net/2003/40806 http://dx.doi.org/10.17877/DE290R-22663 |
Issue Date: | 2021-09-12 |
Rights link: | https://creativecommons.org/licenses/by/4.0/ |
Appears in Collections: | Lehrstuhl Biomaterialien und Polymerwissenschaften |
Files in This Item:
File | Description | Size | Format | |
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Polymer Crystallization - 2021 - Niedik - Improvement of high voltage direct current material properties upon tailoring the.pdf | 4.37 MB | Adobe PDF | View/Open |
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