Diyar Berk

Elastomers with specific conductivity and there aging behavior

Elastomers, among other things, are used as insulating materials in complex insulation systems for cable applications (cable sleeves) in high-voltage direct current (HVDC) transmission. The selection and qualification of suitable materials for specific applications is challenging. In addition to the electrical parameters that are important for the design, knowledge about the aging behavior of these materials also plays a central role. In particular, construction and assembly-related situations in a cable sleeve, such as the "noble joint", or additives (lubricants) required for assembly can significantly influence the service life behavior. The combination or layering of various insulating materials such as silicones or EPDM (ethylene-propylene-diene rubbers) with the XLPE (Cross-linked Polyethylene) used in the cable as part of HVDC also brings with it new challenges for the insulation systems. The electrical conductivity has a decisive influence on the field distribution within the layer insulation system. However, this is significantly influenced by its dependence on various influencing factors such as the ambient temperature, the applied electrical field or production-related defects.

As part of the ELSA project (elastomers with specific conductivity and their aging behavior), different aging mechanisms of different elastomers are being investigated in collaboration with the project partner Pfisterer. By using dielectric diagnostic methods, such as polarization and depolarization measurements or space charge measurements using the PEA method, the condition of the insulating material is assessed over its service life. By additionally interpreting the dielectric properties using spectral investigation methods such as infrared and Raman spectroscopy, which allow information to be drawn about the bonding situation in the polymer, a uniform picture of the aging stage can be obtained.

This newly gained knowledge should make a significant contribution to the better qualification and testing of insulating materials, which should lead to advanced and more reliable fittings.

 

Effects of Vacuum Conditioning on PDC Measurements in Liquid Silicone Rubber

Berk, Diyar, Deniz Targitay, und Markus H. Zink. „Effects of Vacuum Conditioning on PDC Measurements in Liquid Silicone Rubber“. In 2024 IEEE 14th International Conference on the Properties and Applications of Dielectric Materials (ICPADM), 179–82, 2024. doi.org/10.1109/ICPADM61663.2024.10750653.

 

Simulation Analysis of the Dielectric Polarization in Liquid Silicone Rubber

Targitay, Deniz, Diyar Berk, Markus H Zink, Markus Bier, Bastian Franz, und Maja
Kobus. „Simulation Analysis of the Dielectric Polarization in Liquid Silicone Rubber“.
Zittau, 2024.

Analysing the diffusion of silicone- and PTFE-based grease in Liquid Silicone Rubber: An IR spectroscopy approach

Franz, B, D Berk, M H Zink, und M Kobus. „Analysing the Diffusion of Silicone- and PTFE-
Based Grease in Liquid Silicone Rubber: An IR Spectroscopy Approach“. Burghausen,
2024. www.wacker.com/cms/en-us/products/insights/conference-on-silicone-
Insulation.html.