Abstract
The temperature and field dependencies of electric conductivities of two types of silicone rubber-based polymers intended for use in high voltage direct current applications are presented and discussed. The conductivities obtained with the standard method by measuring a current through the material sample placed between metallic electrodes in response to the applied voltage are compared with those deduced from the measured potential decay on pre-charged material surface in an open circuit configuration. The measurements were conducted in the range of the applied electric field strength (0.5–5) kV/mm and temperatures ranging from 22 °C to 70 °C. It is shown that the values of the conductivities obtained by the two methods are in agreement and their temperature dependences obey Arrhenius law yielding similar activation energies.
Highlights
High voltage direct current (HVDC) electric energy transmission is the key technology for transporting bulk power for long distances, linking remotely located renewable energy sources to mainland, interconnecting and balancing alternating current (AC) grids
An example is the methodology for deducing volumetric conductivities from surface potential decay (SPD) characteristics measured on pre-charged materials samples in an open circuit configuration [11,12,13]
It is shown that materials compositions have volumetric currents andand surface potential decay
Summary
High voltage direct current (HVDC) electric energy transmission is the key technology for transporting bulk power for long distances, linking remotely located renewable energy sources (e.g., offshore wind parks) to mainland, interconnecting and balancing alternating current (AC) grids. The influence of the electrodes of the test cell on experimental results requires special consideration, since it may become significant, especially at elevated temperatures, when specific processes in the material and on metal-material interfaces are activated These include, e.g., field assisted charge injection at the interfaces and excessive mechanical stresses due to thermal expansions, especially in cases of soft material samples. An example is the methodology for deducing volumetric conductivities from surface potential decay (SPD) characteristics measured on pre-charged materials samples in an open circuit configuration [11,12,13] It has been shown in [13], where field-dependent bulk conductivities of several types of silicone rubbers were studied at room temperature, that the SPD-based technique provided materials conductivities rather close to those obtained by the standard method. Values of the activation energies deduced from the temperature dependences of the conductivities obtained with both methods are discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
