負(fù)載運(yùn)行的變壓器[外文翻譯].doc
負(fù)載運(yùn)行的變壓器[外文翻譯],包括英文原文和中文翻譯完整全套,可作為電氣相關(guān)畢業(yè)設(shè)計(jì),畢業(yè)論文的外文翻譯使用the transformer on loadit has been shown that a primary input voltage can be transformed to any desired ope...


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此文檔由會(huì)員 小甜甜 發(fā)布負(fù)載運(yùn)行的變壓器[外文翻譯]
包括英文原文和中文翻譯完整全套,可作為電氣相關(guān)畢業(yè)設(shè)計(jì),畢業(yè)論文的外文翻譯使用
The Transformer on load
It has been shown that a primary input voltage can be transformed to any desired open-circuit secondary voltage by a suitable choice of turns ratio. is available for circulating a load current impedance. For the moment, a lagging power factor will be considered. The secondary current and the resulting ampere-turns will change the flux, tending to demagnetize the core, reduce and with it . Because the primary leakage impedance drop is so low, a small alteration to will cause an appreciable increase of primary current from to a new value of equal to . The extra primary current and ampere-turns nearly cancel the whole of the secondary ampere-turns. This being so , the mutual flux suffers only a slight modification and requires practically the same net ampere-turns as on no load. The total primary ampere-turns are increased by an amount necessary to neutralize the same amount of secondary ampere-turns. In the vector equation , ; alternatively, . At full load, the current is only about 5% of the full-load current and so is nearly equal to . Because in mind that , the input kVA which is approximately is also approximately equal to the output kVA......
負(fù)載運(yùn)行的變壓器
通過(guò)選擇合適的匝數(shù)比,一次側(cè)輸入電壓 可任意轉(zhuǎn)換成所希望的二次側(cè)開(kāi)路電壓 。 可用于產(chǎn)生負(fù)載電流,該電流的幅值和功率因數(shù)將由而次側(cè)電路的阻抗決定?,F(xiàn)在,我們要討論一種滯后功率因數(shù)。二次側(cè)電流及其總安匝 將影響磁通,有一種對(duì)鐵芯產(chǎn)生去磁、減小 和 的趨向。因?yàn)橐淮蝹?cè)漏阻抗壓降如此之小,所以 的微小變化都將導(dǎo)致一次側(cè)電流增加很大,從 增大至一個(gè)新值 。增加的一次側(cè)電流和磁勢(shì)近似平衡了全部二次側(cè)磁勢(shì)。這樣的話(huà),互感磁通只經(jīng)歷很小的變化,并且實(shí)際上只需要與空載時(shí)相同的凈磁勢(shì) 。一次側(cè)總磁勢(shì)增加了 ,它是平衡同量的二次側(cè)磁勢(shì)所必需的。在向量方程中, ,上式也可變換成 。滿(mǎn)載時(shí),電流 只約占滿(mǎn)載電流的5%,因而 近似等于 。記住 ,近似等于 的輸入容量也就近似等于輸出容量 。
一次側(cè)電流已增大,隨之與之成正比的一次側(cè)漏磁通也增大。交鏈一次繞組的總磁通 沒(méi)有變化,這是因?yàn)榭偡措妱?dòng)勢(shì) 仍然與 相等且反向。然而此時(shí)卻存在磁通的重新分配,由于 隨 的增加而增加,互感磁通分量已經(jīng)減小。盡管變化很小,但是如果沒(méi)有互感磁通和電動(dòng)勢(shì)的變化來(lái)允許一次側(cè)電流變化,那么二次側(cè)的需求就無(wú)法滿(mǎn)足......