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樓主  發(fā)表于: 2017-11-22 21:52
請教各位經(jīng)驗豐富的師父們,一臺ABB變頻器帶風(fēng)機負載運行時(shí)報接地故障,并且復位不掉,檢查電機及接線(xiàn)都不接地。于是測量變頻器進(jìn)線(xiàn)(接在三相銅排上)電壓,發(fā)現分別是251,249,234v。檢查銅排上的其他負載發(fā)現一個(gè)調功單元的可控硅有損壞,并且調功單元下口帶的加熱器有接地。于是把該調功單元拉閘,旁邊變頻器的接地故障立刻可以恢復了,再次將調功單元合閘,旁邊變頻器立刻又接地故障。(該變頻器與調功單元接在同一三相銅排上)
  有兩個(gè)問(wèn)題:1是什么原因導致銅排上三相220的電壓變成251,249,234v?    2 變頻器進(jìn)線(xiàn)電壓的這種不平衡為什么會(huì )報接地故障呢?

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