Abstract
This contribution deals with test probes with flat cavities (height of gap h = 0.5 mm), which arise in reality from delamination processes caused by thermal expansion. These test probes are aged by means of partial discharges (pds). The different changes on the cavity's surface, for example the development of surface conductivity, increased surface roughness or crystal growth, have an obvious impact on the results of the phase-angle resolved pd measurement. This impact is physically substantiated and interpreted, so that it is thus possible to `look at' the cavity's surface and to assess the damaging relevance of a gap by means of phase-angle resolved pd measurement.
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