Title :
Characterization of dielectric properties of insulating materials for use in an HVDC reference divider
Author :
Elg, A. -P ; Kharezy, M. ; Bergman, A. ; Hällström, J.
Author_Institution :
SP Tech. Res. Inst. of Sweden, Borås, Sweden
Abstract :
Dielectric properties of polyethylene (PE), polyoxymethylene (POM) and ceramic glass (MACOR) are compared. Their suitability to act as a support for a resistor chain in a wideband HVDC reference divider is characterized. The support material forms a parallel capacitance to the resistive resistor chain, and a bandwidth of more than 100 kHz is needed. The frequency dependence of dielectric constant has been measured in the range 20 - 100 kHz. The depolarization current of these materials was measured to be at least 6 orders of magnitude lower than the current through the resistive chain. Neither MACOR nor PE does build up space charge which POM does. Possessing the highest dielectric constant makes MACOR well suited for the application.
Keywords :
dielectric properties; insulating materials; permittivity; polyethylene insulation; resistors; voltage dividers; HVDC reference divider; MACOR; PE; POM; ceramic glass; depolarization current; dielectric constant; dielectric properties; insulating materials; polyethylene; polyoxymethylene; resistive resistor chain; Current measurement; Dielectric constant; HVDC transmission; Materials; Metrology; Space charge; HVDC; current measurement; dielectric; high-voltage techniques; metrology;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250670
