Abstract: The space charge has been a key factor to affect the electrical properties of solid insulation materials. The existence of space charge can cause uneven electric field distribution in polymer, accelerate the aging of insulating materials, and even lead to the breakdown of materials. This paper summarizes the influence factors of space charge accumulation in solid insulation materials, and points out that the accumulation of space charge is closely related to the applied electric field(effects of electric field, electric field type, pre-applied voltage and polarity reversal, etc.), temperature(high temperature, temperature gradient, low temperature), stress, and structure of the dielectrics(such as crosslinking degree, insulation thickness). The suppressed methods to space charge accumulation were summarized from the aspects of electrode materials, surface modification and doping fillers(morphology, size, type and content). The relevant mechanisms of space charge accumulation and suppression are discussed, and the space charge transport mechanism based on trap theory still needs to be further studied.
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