【摘要】：電力變壓器是電力系統(tǒng)的主要設(shè)備之一,其可靠、穩(wěn)定運(yùn)行對(duì)整個(gè)電力系統(tǒng)的安全起到十分重要的作用。近年來(lái),隨著各地電網(wǎng)容量的不斷增加,變壓器故障也不斷增多,故障中近區(qū)或出口短路故障占有很大比例,對(duì)電力系統(tǒng)的安全穩(wěn)定運(yùn)行造成了很大的影響。為了能盡量避免這類事故的發(fā)生,對(duì)變壓器短路時(shí)短路電流及電動(dòng)力進(jìn)行計(jì)算分析,結(jié)合分析結(jié)果對(duì)繞組自身及周圍結(jié)構(gòu)件進(jìn)行弱點(diǎn)補(bǔ)強(qiáng)、進(jìn)行制造技術(shù)、工藝水平的改進(jìn)等研究就具有十分重要的意義。本文介紹了課題的研究背景和意義,論述了變壓器繞組漏磁場(chǎng)、短路電動(dòng)力以及繞組的短路強(qiáng)度等問(wèn)題的國(guó)內(nèi)外研究現(xiàn)狀。然后介紹了電磁場(chǎng)的基礎(chǔ)理論和有限元計(jì)算軟件,論述了漏磁場(chǎng)、短路電流、短路電動(dòng)力等產(chǎn)生原因及計(jì)算方法。以一臺(tái)63000kVA/110kV大型變壓器為例,采用有限元數(shù)值計(jì)算方法,建立了等效計(jì)算模型,對(duì)變壓器繞組的漏磁場(chǎng)分布、短路電動(dòng)力進(jìn)行了計(jì)算分析,并采用短路電動(dòng)力的經(jīng)典的靜態(tài)計(jì)算對(duì)變壓器模型進(jìn)行了短路強(qiáng)度的驗(yàn)證,得出了變壓器短路電動(dòng)力的影響因素,提出了提高變壓器抗短路能力的相關(guān)措施的參考結(jié)論。
[Abstract]:Power transformer is one of the main equipments in power system. Its reliable and stable operation plays a very important role in the safety of the whole power system. In recent years, with the continuous increase of power network capacity, transformer faults are also increasing. The near-zone or outlet short-circuit faults account for a large proportion, which has a great impact on the safe and stable operation of power system. In order to avoid this kind of accident as far as possible, the short circuit current and the electric force of the transformer are calculated and analyzed, and the weakness of the winding itself and the surrounding structure is strengthened with the result of the analysis, and the manufacturing technology is carried out. It is of great significance to study the improvement of process level. This paper introduces the research background and significance of the subject, and discusses the research status of transformer winding leakage magnetic field, short-circuit electromotive force and short-circuit strength of winding at home and abroad. Then the basic theory of electromagnetic field and finite element calculation software are introduced, and the reasons and calculation methods of leakage magnetic field, short circuit current and short circuit electric force are discussed. Taking a large 63000kVA/110kV transformer as an example, an equivalent calculation model is established by using finite element method. The magnetic leakage field distribution and short circuit electromotive force of transformer windings are calculated and analyzed. The short-circuit strength of the transformer model is verified by the classical static calculation of the short-circuit electric power. The influencing factors of the short-circuit electric power of the transformer are obtained, and the reference conclusions of improving the anti-short-circuit ability of the transformer are put forward.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM41
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本文編號(hào)：2272151