Simulations of corona charge neutralisation of insulators

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The purpose of this study is to clarify the phenomena of the corona charge neutralisation of insulators. We investigated the behaviour of ions during neutralisations with different density distributions of initial surface charges on an insulator and compared it with a conductor charge neutralisation using 2D electrohydrodynamic simulations of positive and negative ions. Since the motion of ions near the charged insulator is influenced by the charges not only on the front side surface but also on the opposite side, we found that it can lead to over-neutralisation causing problems. On this point, the phenomena of insulator charge neutralisation is significantly different from those of conductor one; thus, we investigated the validity of the standard evaluation test method of ionisers using a conductor. We suggest a proper use of ionisers to avoid the over-neutralisation. In addition, a method for minimising the offset voltage obtained from the simulation was demonstrated experimentally.