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Technical data
13.3 Disk electrode with Guard ring
13.3.1 IEC standards
According to the latest IEC standards for the analysis of dielectric and resistive properties of solid and
liquid insulating materials
•
IEC 62632-2-1-2018-02: AC methods for solid insulating material analysis
•
IEC 60247-2004: AC methods for liquid insulating material analysis
•
IEC 62631-3-1-2017-03: DC methods for solid insulating material analysis
Disk electrodes with Guard ring should be used for DC methods or AC methods for frequencies < 10
MHz.
In comparison to IEC 60250, the latest IEC standards for AC methods base on the demands on different
frequency ranges.
For AC methods with frequencies > 10 MHz, the recommendation is to use Disk electrodes without
Guard ring to ensure a measurement accuracy as defined in the international standard documents.
IEC 60250-1969 (AC methods) is replaced by the more general IEC 62632-2-1-2018. This standard is
defined for frequencies up to 300 MHz. It describes, next to the requirements of Disk electrodes with
Guard ring, the ranges and applications of other test cell geometries such as Disk electrodes without
Guard ring or Cylindrical electrodes.
13.3.2 ASTM standards
The latest ASTM standards for the analysis of dielectric and resistive properties of solid and liquid
insulating materials using Disk electrodes with Guard ring are:
•
D150-18: AC methods for solid insulating material analysis, (replacement of ASTM D150-11)
•
D924-15: AC methods for liquid insulating material analysis
•
D257-14: DC methods for solid insulating material analysis
