22B-D010N104

22B-D010N104

漏電保護器的原理是，零序電流為零。而使用變頻器時，零序電流不可能為零。

變頻器輸出側為PWM波，電機電纜與大地之間有長電纜的電容效應，使用帶屏蔽層的電纜時，電容效應更加明顯。在變頻器工作時，電容在充放電，有電流通過電容流入大地，并從進線側的接地線再流回變頻器，形成電流回路。如果在進線側使用了漏電保護器，那么它會動作，切斷系統運行。

所以，不要為你的變頻器配漏電保護器了。如果要保證，做好設備接地就行了。

案例分享：

問：一臺18.5kW鍋爐引風機安裝一臺18.5kW的變頻器，變頻器安裝好后一啟動，配電房分閘就跳，原來配電房每路都安裝了漏電保護器（200mA動作，30mA脈沖）。

要求客戶拆除漏電保護遭拒絕，后將載波頻率調到1kHz，改變變頻器啟動方式仍未能解決，后懷疑電機的電源線有漏電，因其長度有20米左右且埋于地下，但要求客戶更換也有困難（其原先工頻使用正常）。

簡單有效的解決方法：

答：由于漏電保護器一般檢測到三相不平衡度為20%以上就會跳保護，當安裝變頻器后三相不平衡度一般會超過50%以上，所以漏電保護器肯定會跳。

下面出幾種方法：

方法一：漏電保護器上一般會有一個調節器，把調節器調大即可；

方法二：把漏電保護器更換為變頻器漏電保護器，市面上有賣變頻器漏電保護器的；

方法三：增大設備負載，也就是馬達負載，變頻器在啟動時漏電流就不會很大了；

方法四：把漏電保護器短接掉。

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