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變頻器旁路方式一：手動旁路方式

變頻器的手動旁路方式，是由3個高壓隔離開關qs1、qs2和qs3組成，如圖1所示。要求qs2和qs3不能同時閉合，在機械上實現互鎖。變頻運行時，qs1和qs2閉合，qs3斷開;工頻運行時，qs3閉合，qs1和qs2斷開。

變頻器的手動旁路方式的優點：在檢修變頻器時，有明顯斷電時間，能夠保證人身安全，同時也可手動使負載投入工頻電網運行;手動旁路可人為判斷故障后再切換，比較安全;造價低等。

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