With the current expansion of the German transmission grid by DC-cables, new technical challenges arise due to the possibility of the formation of space charges in cable accessories, in which especially the dielectric interfaces pose a danger to operational safety. In order to provide a better understanding of this space charge behaviour, measurements have to be conducted. Currently, no method based on the Laser Induced Pressure Pulse Principle (LIPP) allows repeatable space charge measurements of dielectric layer arrangements over long periods. The first part of this thesis presents the development of a method based on the LIPP-principle for repeatable space charge measurements of dielectric layer arrangements. In the second part, the developed method is applied to describe the space charge behaviour at the interface between silicone grease and silicone elastomer in cable accessories. Experiments are carried out with a model consisting of a layer arrangement of silicone grease and silicone elastomer enclosed by brass electrodes. It was shown for the first time, that repeatable space charge measurements based on the LIPP-principle can be conducted on dielectric layer arrangements of silicone grease and silicone elastomer. The measurement signal consists of a complex pattern of reflections and is interpreted on the basis of calculations and experiments. The signal components are assigned to the individual dielectric interfaces in the model arrangement. The space charge measurements with the developed method of the model consisting of silicone grease and silicone elastomer were able to show an increasing exponential charge build-up and charge decay with rising temperatures. It was shown that, independently of temperature and electric field strength, charge at the interface between silicone grease and silicone elastomer decays faster compared to charge within the volume of the model arrangement. The developed method provides the basis for automatic and repeatable space charge measurements based on the LIPP-principle of dielectric layer arrangements in DC-cable accessories.
|Advisor:||Plath, Prof Dr-Ing RonaldGerhard, Prof Dr-Ing ReimundKalkner, Prof Dr-Ing Wilfried|
|School:||Technische Universitaet Berlin (Germany)|
|Source:||DAI-C 81/3(E), Dissertation Abstracts International|
|Keywords:||Space charges, Dielectric interfaces, Laser induced pressure pulse|
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