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An automatic equal phase shift principle (AEPS) is proposed to simplify space charge detection under periodic stress with the pulsed electroacoustic method. For pulse frequency, fp is a non-integral multiple with periodic stress frequency fa; the detecting phase can be automatically shifted with a certain value after each cycle of periodic stress. The pulse position will be at the same phase of periodic...
The effect of space charge on dielectric performances is generally neglected under high voltage alternate current (HVAC) electric fields, due to the limited charge amount accumulated. This paper intends to expound the characteristics of space charge in polymeric under AC stresses and its importance to the breakdown strength of polyethylene. A numerical model based on space charge dynamics under high...
As the main insulation applied in HVDC convertor transformer, the dielectric properties of oil-pressboard insulation system play an important role in the reliability of power system. One of the key problems related to any HVDC insulation systems is the easy formation of space charge within the bulk and at the interfaces. In this paper, space charge behaviour in the impregnated pressboard with 1mm...
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