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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.
Solid insulators are used for support in many types of high voltage apparatus. Because these supports are often composed of high resistivity materials, static charges may be accumulated and held by them for extended periods of time. The electric field distribution in the vicinity of the insulator is then altered so that electrical breakdown in the surrounding gas may result.
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