ABC-PDP -AB7000 HMS

ABC-PDP -AB7000 HMS

）“電壓等級四百伏，一發(fā)零點六千瓦。”當測知電力變壓器二次側(cè)（電壓等級400V）負荷電流后，安培數(shù)值乘以系數(shù)0.6便得到負荷功率千瓦數(shù)。
測知白熾燈照明線路電流，求算其負荷容量
照明電壓二百二，一安二百二十瓦。
說明：工礦企業(yè)的照明，多采用220V的白熾燈。照明供電線路指從配電盤向各個照明配電箱的線路，照明供電干線一般為三相四線，負荷為4kW以下時可用單相。照明配電線路指從照明配電箱接至照明器或插座等照明設施的線路。不論供電還是配電線路，只要用鉗型電流表測得某相線電流值，然后乘以220系數(shù)，積數(shù)就是該相線所載負荷容量。測電流求容量數(shù)，可幫助電工迅速調(diào)整照明干線三相負荷容量不平衡問題，可幫助電工分析配電箱內(nèi)保護熔體經(jīng)常熔斷的原因，配電導線發(fā)熱的原因等等。
測知無銘牌380V單相焊接變壓器的空載電流，求算基額定容量
口訣：

Force CPCI-745 BOARD PCA.PENT/CPCI-7?45 P.N 120918

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三百八焊機容量，空載電流乘以五。
單相交流焊接變壓器實際上是一種特殊用途的降壓變壓器，與普通變壓器相比，其基本工作原理大致相同。為滿足焊接工藝的要求，焊接變壓器在短路狀態(tài)下工作，要求在焊接時具有一定的引弧電壓。當焊接電流增大時，輸出電壓急劇下降，當電壓降到零時（即二次側(cè)短路），二次側(cè)電流也不致過大等等，即焊接變壓器具有陡降的外特性，焊接變壓器的陡降外特性是靠電抗線圈產(chǎn)生的壓降而獲得的。