這篇文章這兒所說(shuō)的中壓變頻器，是指電壓等級(jí)從750v～2300v的變頻器，分為兩個(gè)電壓等級(jí)，1140v和2300v兩種類型的變頻器。這種類型的變頻器負(fù)載通常都是油田上用的潛油電泵，1140v的還有用于抽油機(jī)的。我們簡(jiǎn)要說(shuō)一下設(shè)備調(diào)試方法。
1. 設(shè)備進(jìn)程
(1)接控制線
供認(rèn)原工頻工作時(shí)的工作情況，首要要了解潛油電泵的工作進(jìn)程。
潛油電泵是一種深置于井下1000m—3000m的電泵，因?yàn)殡娎|線較長(zhǎng)，地面上的供電設(shè)備要能賠償這有些電纜損耗，因而原工頻設(shè)備要供給比電機(jī)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(shè)備，在設(shè)備前都要進(jìn)行絕緣檢驗(yàn)。用2500v的兆歐表檢驗(yàn)，絕緣電阻不應(yīng)低于50mω。
要查看正本的工頻供電的電壓及工作電流，以便調(diào)試時(shí)參看。
因?yàn)橛吞锷蠞撚碗姳孟卤玫纳疃炔灰粯?，潛油電泵供電的電壓就有所不一樣。因而?duì)應(yīng)于同一電壓等級(jí)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(wèn)，筆者在變頻器內(nèi)部設(shè)備了一個(gè)變壓器，對(duì)應(yīng)于不一樣的電壓輸入，電壓輸出都是一樣的。關(guān)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(jī)維護(hù)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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