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According to recent research related to space charge in polymer dielectrics, the internal space charge behavior is an important factor in the evaluation of insulation. In the case of a high-voltage oil-impregnated dc cable, polypropylene laminated paper (PPLP) is used as an insulation material, however, its space charge characteristics have not been observed in detail. We measured the transient phenomena of space charge accumulation in a PPLP sample using the pulsed electroacoustic method. In this paper, we describe the space charge behavior in PPLP samples impregnated with several types of silicone oil. The results suggested that space charge accumulates at the interface between the electrode and polypropylene under dc voltage application, and decreases exponentially. The time constant depends on the type of insulation oil. Thus it is revealed that the space charge observation provides usuful information in the evaluation of dc characteristics of PPLP insulation systems.

Time dependence of Interface Charge in Polypropylene Laminated Paper under DC Voltage