A review of data on the investigation of reversal currents in dielectric liquids shows that the shape of the reversal characteristic depends on the nature of the liquid and the impurities in it, the field strength, the time interval, the time repetition, the electrode gap, the temperature etc. In general, the reversal current shows that charged layers accumulated near electrodes can act as reservoirs of positive and negative charge carriers. So, the current waveform under reverse DC polarity in dielectric liquids can be explained in terms of monopolar or bipolar injection from these charged layers.
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