描述
A6220
國內(nèi)有很多制造變頻電纜的工廠,經(jīng)驗豐富,品種規(guī)格具全,足以滿足國內(nèi)需求。過去也有很多公開發(fā)表的文獻,所以本文不必再重復(fù)敘述。只是提出三條原則:①低壓變頻電纜的結(jié)構(gòu)設(shè)計對稱化,對于小功率電機,可用3芯成纜后加總屏;對于大功率電機,可用3大3小絕緣導(dǎo)體,對稱排列成纜,最后加總屏。②中壓變頻電纜的結(jié)構(gòu)設(shè)計同軸化。③任何屏蔽層的截面,應(yīng)滿足用戶提出的最小規(guī)定,如果銅帶截面尺寸不夠,可稀疏纏繞銅線,達到要求的導(dǎo)體面積。圖1~圖3為三種變頻電纜的示意圖。由于六芯電纜中3個小絕緣芯的導(dǎo)體截面之和,與4芯電纜中第4絕緣芯的導(dǎo)體截面相等,而六芯對稱型成纜直徑比四芯成纜直徑略小,因此電纜成本基本相等。
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