本文關(guān)鍵詞： 電力變壓器 短路 失穩(wěn) 結(jié)構(gòu) 優(yōu)化設(shè)計(jì)　出處：《山東大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：我國(guó)堅(jiān)強(qiáng)智能電網(wǎng)不斷發(fā)展壯大,220kV電力變壓器不斷增強(qiáng)的抗短路能力,是保證電網(wǎng)安全穩(wěn)定運(yùn)行的重要基礎(chǔ)。隨著技術(shù)進(jìn)步,電網(wǎng)發(fā)展,也不斷擴(kuò)大了電網(wǎng)的容量和范圍,也大大增長(zhǎng)了短路幾率和短路電流,這就要求220kV電力變壓器的抗短路能力更高。尤其大容量變壓器,出現(xiàn)短路事故后,短路電流非常大,如果無(wú)法滿足抗短路要求,大范圍停電將會(huì)出現(xiàn),糟糕后果將會(huì)產(chǎn)生,群眾生活和社會(huì)生產(chǎn)將受損嚴(yán)重,影響巨大。220kV變壓器作為輸電線網(wǎng)中的非常重要的部分,電網(wǎng)如若不能穩(wěn)定運(yùn)行,很大一部分原因是其運(yùn)行質(zhì)量不好。工業(yè)用戶用電量不斷提高,電力缺口也顯著增長(zhǎng),高壓、大容量作為發(fā)展方向趨勢(shì)日趨明顯。電磁負(fù)荷對(duì)220kV電力變壓器運(yùn)行而言,所承受數(shù)值量很高,漏磁場(chǎng)被相應(yīng)放大,但是電網(wǎng)的等效阻抗在變小,當(dāng)系統(tǒng)短路時(shí),電網(wǎng)中產(chǎn)生的短路電流數(shù)值的增加是成倍的,此時(shí)變壓器被附加一系列嚴(yán)峻的問(wèn)題,實(shí)際情況也是220kV電力變壓器經(jīng)常遭受短路沖擊。近期很多220kV電力變壓器發(fā)生事故。返廠檢修發(fā)現(xiàn),自身抗短路能力不強(qiáng)是造成短路損壞的一個(gè)很重要原因。這種故障的危害性顯而易見(jiàn),電網(wǎng)安全運(yùn)行得不到保證。因此,抗短路能力作為一個(gè)出廠驗(yàn)收重要指標(biāo),是保證變壓器長(zhǎng)期安全運(yùn)行的可靠手段。本課題通過(guò)研究電力變壓器遭遇突發(fā)短路后發(fā)生繞組失穩(wěn)以及結(jié)構(gòu)件損壞的現(xiàn)象,探索優(yōu)化措施,包括電磁計(jì)算、結(jié)構(gòu)設(shè)計(jì)、工藝流程。并在實(shí)現(xiàn)抗短路能力的情況下,兼顧產(chǎn)品結(jié)構(gòu)優(yōu)化及效益�；诘湫臀锢砉剿惴坝邢拊�,利用REST、Ansys等仿真分析軟件,對(duì)220kV變壓器進(jìn)行進(jìn)行抗短路能力、結(jié)構(gòu)件強(qiáng)度仿真分析,各項(xiàng)措施能否達(dá)到相關(guān)要求得到了驗(yàn)證。通過(guò)以上研究,掌握了 220kV變壓器與抗短路能力相關(guān)的內(nèi)部結(jié)構(gòu)特點(diǎn)。
[Abstract]:The strong smart grid in China is developing and strengthening the anti-short-circuit ability of 220kV power transformers, which is the important foundation to ensure the safe and stable operation of the power grid. With the development of technology, the power grid is developing. It also expands the capacity and range of power network and greatly increases short-circuit probability and short-circuit current, which requires 220kV power transformer to have higher anti-short-circuit capability, especially high-capacity transformer. After the short circuit accident, the short circuit current is very large, if can not meet the anti-short-circuit requirements, large-scale power outages will occur, bad consequences will occur, people's lives and social production will be seriously damaged. As a very important part of the transmission line network, if the power grid can not operate stably, a large part of the reason is that the operation quality is not good, and the power consumption of industrial users is increasing continuously. The power gap also increased significantly, high voltage, large capacity as the trend of development is becoming more and more obvious. Electromagnetic load on 220 kV power transformer operation, the numerical value is very high, leakage magnetic field is amplified accordingly. However, the equivalent impedance of the power network is becoming smaller. When the system is short-circuit, the value of the short-circuit current generated in the power network is multiplied, and a series of severe problems are attached to the transformer. The actual situation is that 220kV power transformers often suffer from short-circuit impact. Recently, many 220kV power transformers have accidents. The weak ability of resisting short circuit is a very important cause of short circuit damage. The harm of this kind of fault is obvious and the safe operation of power network can not be guaranteed. Short circuit resistance is an important indicator of factory acceptance. It is a reliable means to ensure the long-term safe operation of transformers. By studying the phenomenon of winding instability and structural damage after power transformers encounter sudden short circuit, the paper explores the optimization measures, including electromagnetic calculation. Structure design, process flow, and under the condition of anti-short-circuit ability, product structure optimization and benefit are given consideration. Based on typical physical formula algorithm and finite element method, REST is used. Ansys and other simulation analysis software, 220 kV transformer for short-circuit resistance, structural strength simulation analysis, the measures to meet the relevant requirements have been verified. Through the above research. The internal structure characteristics of 220 kV transformer related to short circuit resistance are grasped.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM41

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本文編號(hào)：1480522