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三相變壓器容量計算方法

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三相變壓器容量計算方法

發布日期:2018-01-27 作者: 點擊:

計算負載的每相最大功率

將A相、B相、C相每相負載功率獨立相加,如A相負載總功率10KW,B相負載總功率9KW,C相負載總功率11KW,取最大值11KW。(注:單相每臺設備的功率按照銘牌上面的最大值計算,三相設備功率除以3,等于這臺設備的每相功率。)

例如:C相負載總功率 = (電腦300W X 10臺)+(空調2KW X 4臺)= 11KW

計算三相總功率

11KW X 3相 = 33KW(變壓器三相總功率)

三相總功率 / 0.8,這是最重要的步驟,目前市場上銷售的變壓器90%以上功率因素只有0.8,所以需要除以0.8的功率因素。

33KW / 0.8 = 41.25KVA(變壓器總容量)

變壓器總功率 / 0.85,根據《電力工程設計手冊》,變壓器容量應根據計算負荷選擇,對平穩負荷供電的單臺變壓器,負荷率一般取85%左右。

41.25KW / 0.85 = 48.529KVA(需要購買的變壓器功率) ,那么在購買時選擇50KVA的變壓器就可以了


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