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Partial discharge (PD) measurements are commonly employed in non-destructive testing of dielectrics and systems. Often voids, interface adhesion problems, or electrode surface irregularities can be detected. Another type of defect is the small metallic element which is not connected to an electrode but can also cause partial discharge. The partial discharges from such elements at floating potential...
Stress enhancement due to the migration of charges can be a critical factor in the design of solid insulation for high voltage DC systems. The effect of bulk currents on surface and internal charge accumulation is discussed; and equations are formulated which predict steady-state conditions in arbitrary configurations o Experimental evidence is given for the validity of this analysis in epoxy insulators.
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