A Generalized Approach to Partial Discharge Modeling

  • Niemeyer L
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Abstract

An important tool for improving the reliability of HV insulation
systems are partial discharge (PD) measurements. The interpretation of
such measurements aims at extracting from the measured data information
about insulation defects which then are used for estimating the risk of
insulation failure of the equipment. Because the physical understanding
of PD has made substantial progress in the last decade, it can now be
exploited to support interpretation. In this paper a concept is
presented which merges the available physical knowledge about various PD
types into a generalized model which can be applied to arbitrary
insulation defects. This approach will be restricted to PD of the
streamer type in gases and at gas-insulator interfaces which cover a
large fraction of the cases encountered in technical insulation systems.
The generalized model allows us to derive approximate relations between
defect characteristics, insulation design parameters and test conditions
on one side, and measurable PD characteristics on the other. The
inversion of these relations yields rules for extracting defect
information from the PD data. The application of the generalized model
is illustrated by two simple examples, namely, spherical voids in an
insulator and electrode protrusions in SF6

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Authors

  • Lutz Niemeyer

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