電氣專業(yè)畢業(yè)設計外文翻譯----電力變壓器工作原理-電氣類(完整版)
【正文】 and (2) it provides a ponent to account for the hysteresis and eddy current losses in the core. There bined losses are normally referred to as the core losses. The noload current Iθ is usually few percent of the rated fullload current of the transformer (about 2 to 5%). Since at noload the primary winding acts as a large reactance due to the iron core, the noload current will lag the primary voltage by nearly 90186。 that is, it has no losses. Thus Pm = Pout or VpIp primary PF = VsIs secondary PF where PF is the power factor. For the abovestated assumption it means that the power factor on primary and secondary sides are equal。 變壓器是高效率的，因為它沒有旋轉(zhuǎn)損失，因此在電壓等級轉(zhuǎn)換的過程中，能量損失比較少。 3. 變壓器的工作原理 當二次側(cè)電路開路是，即使原邊被施以正弦電壓 oV ，也是沒有能量轉(zhuǎn)移的。 第二個分量 Ie=I0sinθ0，與原邊電壓同相。因此，它于施加的電壓有180186。從交流 電原理可知，有效值是一個正弦波，其值為平均電壓的 倍；因此 E = m? 因為一次側(cè)繞組和二次側(cè)繞組的磁通相等，所以繞組中每匝的電壓也相同。為了計算電壓，我們需要更多數(shù)據(jù)。因此，我們把這種類型的變壓器稱為絕緣型變壓器。 。在第四部分我們會了解到當變壓器帶負荷運行時一次側(cè)繞組電流是如何隨著二次側(cè)負荷電流變化而變化的。實際上 , 變比從標識牌數(shù)據(jù)獲得 , 列出在滿載情況下原邊和副邊電壓。一次側(cè)和二次側(cè)電壓增長的比率稱做變比。因為沒有電流流過二次側(cè)繞組， Es=Vs。兩個相量的分量和代表空載電流，即 emo III ?? 應注意的是空載電流是畸變和非正弦形的。這個空載電流有兩項 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） 它的一個分量說明了鐵芯中的渦流和磁滯損耗。 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。因為最終的負荷，在一些點高電壓必須降低。 in phase behind the primary voltage VP. It is this ponent that sets up the flux in the core。. It is readily seen that the current ponent Im= I0sinθ0, called the magizing current, is 90186。 therefore VpIp = VsIs from which is obtained psVV = psII ≌ psEE ≌ a It shows that as an approximation the terminal voltage ratio equals the turns ratio. The primary and secondary current, on the other hand, are inversely related to the turns ratio. The turns ratio gives a measure of how much the secondary voltage is raised or lowered in relation to the pr imary voltage. To calculate the voltage regulation, we need more information. The ratio of the terminal voltage varies somewhat depending on the load and its power factor. In practice,
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