Conductivity measurement of plaque samples obtained from the insulation of high voltage extruded cables
DOI:
https://doi.org/10.5324/nordis.v0i24.2283Keywords:
XLPE, HVDC, conductivity, measurements, temperature, electric field,Abstract
Good understanding of insulation conductivity is of
great importance in development and design of high
voltage DC cables. Conductivity of polymeric insulation
materials is a property which is quite sensitive to many
parameters such as temperature, electric field, chemical
composition, thermal history, morphology, etc.
Therefore, due to different process history, the results
obtained from pressed plaques are not necessarily
representative of the insulation behavior in an extruded
cable. A method was developed to obtain samples from
HV cable in form of plaques with a thicknesses up to a
few millimeters. Plaque samples were extracted from
two cables, their conductivity at high field was
measured and compared to those obtained from fullscale
tests; the results, confirm a very good agreement
between the small scale and full-scale measurements;
this hints to a promising prospect for such small scale
characterization techniques.
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