電氣專業(yè)畢業(yè)設(shè)計(jì)外文翻譯----電力變壓器工作原理-電氣類(文件)
【正文】 側(cè)和二次側(cè)的功率因素是相等的；因此 VpIp = VsIs 從上式我們可以得知 psVV = psII ≌ psEE ≌ a 它表明端電壓比等于匝數(shù)比，換句話說(shuō)，一次側(cè)和二次側(cè)電流比與匝數(shù)比成反比。一次側(cè)和二次側(cè)電壓增長(zhǎng)的比率稱做變比。產(chǎn)生電壓的平均值如下 Eavg = turns給 定 時(shí) 間 內(nèi) 磁 通 變 化 量給 定 時(shí) 間 即是法拉第定律在瞬時(shí)時(shí)間里的應(yīng)用。因?yàn)闆](méi)有電流流過(guò)二次側(cè)繞組， Es=Vs。相同的磁通會(huì)通過(guò)原邊自身，產(chǎn)生一個(gè)電動(dòng)勢(shì) Ep。兩個(gè)相量的分量和代表空載電流，即 emo III ?? 應(yīng)注意的是空載電流是畸變和非正弦形的。顯然可見電流分量 mI = I0sinθ0，被稱做勵(lì)磁電流，它在相位上滯后于原邊電壓 VP 90186。這個(gè)空載電流有兩項(xiàng) 功能： （ 1） 在鐵芯中產(chǎn)生電磁通，該磁通在零和 ? m? 之間做正弦變化，m? 是鐵芯磁通的最大值； （ 2） 它的一個(gè)分量說(shuō)明了鐵芯中的渦流和磁滯損耗。變壓器在原邊接收電能的同時(shí)也在向副邊所帶的負(fù)荷輸送電能。 從交流電源流入電流的一側(cè)被稱為變壓器的一次側(cè)繞組或者是原邊。兩個(gè)線圈之所以相互耦合，是因?yàn)樗鼈冞B接著共同的磁通。因?yàn)樽罱K的負(fù)荷，在一些點(diǎn)高電壓必須降低。 thus the induced quantities Ep and Es vary as a sine function. The average value of the induced voltage given by Eavg = turns c h a n g e in flu x in a g iv e n tim eg iv e n tim e which is Faraday’s law applied to a finite time interval. It follows that Eavg = N 21/(2 )mf? = 4fNφm which N is the number of turns on the winding. Form ac circuit theory, the effective or rootmeansquare (rms) voltage for a sine wave is times the average voltage。 in phase behind the primary voltage VP. It is this ponent that sets up the flux in the core。 外文資料翻譯 Power Transformer Principles 1. INTRODUCTION The highvoltage transmission was need for the case electrical power is to be provided at considerable distance from a generating station. At some point this high voltage must be reduced, because ultimately is must supply a load. The transformer makes it possible for various parts of a power system to operate at different voltage levels. In this paper we discuss power transformer principles and applications. 2. TOWWINDING TRANSFORMERS A transformer in its simplest form consists of two stationary coils coupled by a mutual magic flux. The coils are said to be mutually coupled because they link a mon flux. In power applications, laminated steel core transformers (to which this paper is restricted) are used. Transformers are efficient because the rotational losses normally associated with rotating m
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