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Abstract The accumulation of space charge within XLPE materials can lead to the electric field’s uneven distribution, thereby increasing the risk of insulation problems in cables. However, the damage mechanism of space charge on cable insulation is not understood completely. Therefore, this study is dedicated to analysing the behaviour of space charge accumulation and dissipation in pressed XLPE granular material. The charge movement mechanism within XLPE materials was meticulously analysed with the pulsed electro-acoustic method. Experimental results reveal that the pressed granular XLPE accumulates charges of the same polarity, and that the total charge within the pressed granular XLPE significantly decreases with increasing voltage application time.
Lin et al. (Thu,) studied this question.