Experiences in Testing Porcelain

Abstract
The paper gives the results of numerous experiences in testing ing porcelain insulators particularly in regard to porosity, absorption of water, surface leakage and dielectric losses. Considerable energy is required to drive moisture out of a porous insulator and it has been found best to restrict the oscillator testing to dry porcelain, whereas the wetter the porcelain the more effective is the 60-cycle test.

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