We have to transmit the auxiliary energy to high potential. Therefore we need a highly insulating transformer which translates from 230 V to 300 V but is able to do a galvanic separation at 30 kV DC. The power is only 9 VA. To guarantee an absolutely secure separation, the partial discharge may not be higher than 10 pC at 14 kV eff. The transformer needs a shielding to keep the linking of distortions low.
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