在以下一個(gè)半開關(guān)方案中僅以用于電流輸入為例說(shuō)明源的概念這個(gè)應(yīng)用中,電流流向如箭頭所示。一部分電流通過上邊的母線流向其它部分或是其它電力設(shè)備,一部分電流流入變壓器的線圈1。流入線圈1的電流是兩個(gè)CT電流的相量和或差，(和或差取決于兩個(gè)CT的連接極性)。對(duì)于變壓器線圈2,同理。對(duì)于變壓器保護(hù)來(lái)說(shuō),保護(hù)元件要求和電流。但是對(duì)于其它元件可能需要CT1和CT2的單電流。

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