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·WIMA Radio Interference Suppression Capacitors with High Corona Inception Voltage
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Corona or partial discharge of metallized plastic film capacitors is regularly caused by ionization of air pockets in the capacitor winding element. In demanding AC voltage circuits e. g. where voltage is supplied via a capacitor power supply (the capacitor is switched in series to the load circuit as a low-loss series impedance) transient over-voltage may exceed the dielectric strength of the air pockets and cause partial discharge that may result in local demetallisation of the film and thus a considerable capacitance reduction.
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