本文關(guān)鍵詞：電力變壓器繞組短路電動(dòng)力計(jì)算　出處：《哈爾濱理工大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 電力變壓器 電磁場(chǎng)分布 場(chǎng)路耦合 短路電動(dòng)力 繞組機(jī)械強(qiáng)度

【摘要】：電力變壓器在電網(wǎng)中主要起到能量轉(zhuǎn)換和傳輸?shù)淖饔�，是發(fā)電廠和變電所的重要設(shè)備之一，其承受短路能力的大小直接關(guān)系到電網(wǎng)是否能夠安全可靠的運(yùn)行。隨著國(guó)民經(jīng)濟(jì)的快速發(fā)展以及國(guó)家對(duì)電網(wǎng)的不斷投建和改造，使得越來(lái)越多的大型電力變壓器在電網(wǎng)中被投入使用，但在其運(yùn)行過(guò)程中當(dāng)變壓器受到短路沖擊電流作用時(shí)因繞組的機(jī)械強(qiáng)度不足而引起的事故屢見(jiàn)不鮮。因此，提高大型電力變壓器繞組抗短路能力是需要解決的問(wèn)題。 本文以一臺(tái)三相五柱式電力變壓器為例，對(duì)其內(nèi)部瞬態(tài)電磁場(chǎng)、繞組短路電動(dòng)力以及線圈的機(jī)械強(qiáng)度問(wèn)題進(jìn)行了深入的分析研究。介紹了本課題的研究背景和意義，闡述了大型電力變壓器內(nèi)部電磁場(chǎng)、繞組短路電動(dòng)力以及繞組機(jī)械強(qiáng)度問(wèn)題的國(guó)內(nèi)外發(fā)展情況。對(duì)樣機(jī)建立三維有限元模型，利用場(chǎng)路耦合方法計(jì)算了此模型在額定運(yùn)行和短路運(yùn)行兩種不同情況下變壓器三維瞬態(tài)電磁場(chǎng)的磁密分布及繞組靜態(tài)時(shí)軸向和輻向的受力大小，并給出其分布規(guī)律。與此同時(shí)，針對(duì)電力變壓器繞組在其高度方向上的機(jī)械強(qiáng)度問(wèn)題進(jìn)行了商討，建立了變壓器低壓繞組在Z軸方向上的模態(tài)振動(dòng)數(shù)學(xué)模型，計(jì)算了在短路沖擊力的作用下繞組線餅軸向上產(chǎn)生的位移變化及引起的共振頻率大小，并針對(duì)繞組的短路電動(dòng)力進(jìn)行了校核。此課題為加強(qiáng)繞組承受短路能力的設(shè)計(jì)提供了一定的理論依據(jù)，，為今后類(lèi)似的研究提供了參考依據(jù)，具有一定的理論和工程應(yīng)用價(jià)值。
[Abstract]:Power transformers play an important role in energy conversion and transmission in power grid, and are one of the important equipments in power plants and substations. Its ability to bear short circuit is directly related to whether the power grid can operate safely and reliably. With the rapid development of the national economy and the continuous investment and reconstruction of the power grid. As a result, more and more large power transformers are put into use in the power grid. However, when the transformer is affected by short-circuit impact current during its operation, accidents caused by insufficient mechanical strength of windings are common. To improve the short-circuit resistance of large power transformer windings is a problem to be solved. Taking a three-phase five-column power transformer as an example, the transient electromagnetic field inside the transformer is studied. The short circuit electromotive force of winding and the mechanical strength of the winding are deeply analyzed and studied. The research background and significance of this subject are introduced, and the electromagnetic field inside the large power transformer is expounded. The development of windings short circuit electromotive force and winding mechanical strength at home and abroad. The 3D finite element model of the prototype is established. The field circuit coupling method is used to calculate the magnetic density distribution of the three dimensional transient electromagnetic field of the transformer and the axial and radial force under static winding under two different conditions of rated operation and short circuit operation. At the same time, the mechanical strength of the power transformer winding in the direction of its height is discussed, and the mathematical model of the modal vibration of the low-voltage winding of the transformer in the Z-axis direction is established. The displacement change and resonance frequency caused by the axial direction of the winding wire cake under the action of short circuit impact force are calculated. The short circuit electromotive force of the winding is checked. This subject provides a certain theoretical basis for the design of strengthening the short circuit bearing capacity of the winding, and provides a reference basis for similar research in the future. It has certain theory and engineering application value.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM41

【引證文獻(xiàn)】

相關(guān)期刊論文 前2條

1 樊益平;張軍;張海龍;賀好艷;馬奎;丁培;;變阻抗節(jié)能變壓器的動(dòng)熱穩(wěn)定性能研究[J];高壓電器;2017年01期

2 王洋;曹晨;徐建源;;基于磁-結(jié)構(gòu)耦合法的變壓器繞組振動(dòng)特性研究[J];電工電氣;2016年02期

相關(guān)碩士學(xué)位論文 前3條

1 王洋;電力變壓器運(yùn)行狀態(tài)下振動(dòng)特性研究[D];沈陽(yáng)工業(yè)大學(xué);2016年

2 李大華;整流變壓器繞組漏磁計(jì)算及線圈結(jié)構(gòu)優(yōu)化[D];南昌大學(xué);2015年

3 王雪婷;基于微槽群復(fù)合相變冷卻技術(shù)的變壓器短路溫度特性研究[D];湖南大學(xué);2015年

本文編號(hào)：1382704