描述
變頻器的過電壓集中表現(xiàn)在直流母線的支流電壓上。正常情況下,變頻器直流電為三相全波整流后的平均值。若以380V線電壓計算,則平均直流電壓Ud=1.35U線=513V。在過電壓發(fā)生時,直流母線的儲能電容將被充電,當電壓上至760V左右時,變頻器過電壓保護動作。因此,變頻器來說,都有一個正常的工作電壓范圍,當電壓超過這個范圍時很可能損壞變頻器
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