這篇文章這兒所說的中壓變頻器，是指電壓等級從750v～2300v的變頻器，分為兩個電壓等級，1140v和2300v兩種類型的變頻器。這種類型的變頻器負載通常都是油田上用的潛油電泵，1140v的還有用于抽油機的。我們簡要說一下設備調試方法。
1.　設備進程
(1)接控制線
供認原工頻工作時的工作情況，首要要了解潛油電泵的工作進程。
潛油電泵是一種深置于井下1000m—3000m的電泵，因為電纜線較長，地面上的供電設備要能賠償這有些電纜損耗，因而原工頻設備要供給比電機額外電壓高出100—300v的供電電壓。
電泵及電纜都是高溫、高壓的設備，在設備前都要進行絕緣檢驗。用2500v的兆歐表檢驗，絕緣電阻不應低于50mω。
要查看正本的工頻供電的電壓及工作電流，以便調試時參看。
因為油田上潛油電泵下泵的深度不一樣，潛油電泵供電的電壓就有所不一樣。因而對應于同一電壓等級的變頻器而言，就有不一樣的電壓輸入，變頻器的控制電壓就有所不一樣。為了處理這一疑問，筆者在變頻器內部設備了一個變壓器，對應于不一樣的電壓輸入，電壓輸出都是一樣的。關于這類變頻器，其輸出都只需220v、110v、380v三組電壓。220v是給控制電路供電的，110v是給電機維護儀供電的，380v是給電壓表供電的。其控制接線如圖2示。

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