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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.
Inorganic insulators are often necessary, especially when elevated temperatures are encountered o Ceramics generally exhibit low volume insulation strength compared to more homogeneous materials and are relatively costly, whereas glasses are typically lossy and prone to low voltage breakdown under ac. A specialty glass prepared with a very low alkali metal content has been studied as a potential bulk...
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