PFC for Transformers
Qc = needed capacitor (kvar)
Io% = magnetising current of the transformer (AS%)
AN = apparent rated power of the transformer in kVA
There are regional differences in the guidelines of power suppliers con- cerning the admissible size of ca- pacitors directly connected with a transformer. Therefore a consultation with the respective power supplier is recommended before installation of a compensation bank. Modern transformers have laminations which only need low capacity to reverse the magnetism. In case the capacitor output is too high, stress increase may occur during idling.