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熱式斷路器

如何正確選擇、使用剩余電流保護器RCD?看完這篇基本明白了

發(fā)布日期:2022-10-15 點擊率:87

在一些高檔住宅小區(qū),空調(diào)采用戶內(nèi)VRV集中空調(diào),開關(guān)應(yīng)選擇三相四線式RCD保護,如果錯誤選擇,開關(guān)無法投入使用,再有如潛污泵配電回路的RCD保護選擇也存在同樣問題。

電氣設(shè)計人員或設(shè)備采購人員沒有仔細(xì)研究三相漏電開關(guān)原理,錯誤選用開關(guān)產(chǎn)品。

三相漏電開關(guān)錯誤接法如圖1所示。在圖示錯誤選用漏電開關(guān)的接線中,三相電流和N線電流之和為0,即

,在回路正常工作時,由于三相電流不平衡,N線上有電流通過,因此

, 零序電流互感器檢測到不平衡電流通過,引起開關(guān)跳閘。

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