發(fā)布時(shí)間：2018-08-20 09:30

【摘要】：高磁感取向硅鋼片作為特高壓變壓器鐵心的基本組成材料,其勵(lì)磁性能直接影響到特高壓變壓器運(yùn)行的整機(jī)性能和運(yùn)行可靠性。特高壓變壓器用高磁感取向硅鋼片經(jīng)過剪片、疊片等工序加工成變壓器鐵心時(shí),其勵(lì)磁性能會(huì)產(chǎn)生一定程度的改變,因此高磁感取向硅鋼片在特高壓變壓器應(yīng)用條件下的勵(lì)磁性能有待深入研究。選取目前已應(yīng)用于特高壓變壓器的三種牌號(hào)硅鋼片,通過分析愛潑斯坦方圈的原理,對(duì)比研究了三種牌號(hào)硅鋼片在理想條件下的勵(lì)磁特性,結(jié)果表明:硅鋼片的勵(lì)磁性能基本與牌號(hào)對(duì)應(yīng),同類型的勵(lì)磁性能相當(dāng)。針對(duì)一種典型特高壓?jiǎn)蜗嘧儔浩鞯蔫F心結(jié)構(gòu),研究了對(duì)應(yīng)的磁路和每部分的磁通分布,深入分析了硅鋼片勵(lì)磁特性與變壓器空載特性之間的對(duì)應(yīng)關(guān)系,在此基礎(chǔ)上,給出變壓器空載電流和空載損耗的常規(guī)計(jì)算方法。研制了與特高壓?jiǎn)蜗嘧儔浩麒F心在不同比例額定電壓下等磁密、結(jié)構(gòu)相同的等比縮小模型,以鐵心模型為試驗(yàn)變壓器搭建了硅鋼片應(yīng)用磁性能測(cè)試系統(tǒng)。根據(jù)IEC和國(guó)標(biāo)中對(duì)變壓器整機(jī)試驗(yàn)的要求,分別設(shè)計(jì)了工頻飽和勵(lì)磁條件下和直流偏磁條件下鐵心模型勵(lì)磁性能測(cè)試的試驗(yàn)方案。針對(duì)所選取三種牌號(hào)制成的鐵心模型分別進(jìn)行了工頻飽和勵(lì)磁、直流偏磁和反復(fù)過勵(lì)磁條件下勵(lì)磁特性的測(cè)試和分析,并對(duì)工頻飽和勵(lì)磁下的測(cè)試結(jié)果與由硅鋼片單片磁性能計(jì)算得到的鐵心模型空載損耗和空載電流進(jìn)行了對(duì)比分析。結(jié)果表明:常規(guī)計(jì)算方法求得的變壓器空載性能數(shù)據(jù)與實(shí)測(cè)值有一定偏差,其中空載損耗的偏差較小有一定的參考價(jià)值,而空載電流的偏差較大,參考價(jià)值有限,從側(cè)面反映傳統(tǒng)計(jì)算方法的局限性。通過對(duì)三種類型鐵心模型在不同勵(lì)磁條件下空載特性的深入分析和研究,提出一系列基于鐵心模型的高磁感取向硅鋼片勵(lì)磁性能評(píng)估參考指標(biāo),并利用該指標(biāo)評(píng)估了本文研究所選取的三種牌號(hào)硅鋼片的勵(lì)磁性能。這些指標(biāo)反映了高磁感取向硅鋼片在深度勵(lì)磁飽和及直流偏磁等極端應(yīng)用條件下的勵(lì)磁性能,從而能更科學(xué)合理評(píng)估特高壓變壓器用取向硅鋼片的勵(lì)磁性能,對(duì)特高壓變壓器的鐵心材料選型具有重要的工程應(yīng)用價(jià)值。
[Abstract]:High magnetic inductive oriented silicon steel sheet is the basic component material of UHV transformer core. Its excitation performance directly affects the whole machine performance and operation reliability of UHV transformer. When the high magnetic inductive oriented silicon steel sheet used in UHV transformer is processed into transformer core through shearing and lamination, its excitation performance will change to a certain extent. Therefore, the excitation performance of high magnetic inductive oriented silicon steel sheet in UHV transformer needs further study. By analyzing the principle of Epstein square ring, the excitation characteristics of three kinds of silicon steel sheets have been studied under ideal conditions, which have been applied to UHV transformers. The results show that the excitation performance of the silicon steel sheet is basically corresponding to the grade, and the excitation performance of the same type is equivalent. In view of the core structure of a typical UHV single-phase transformer, the corresponding magnetic circuit and magnetic flux distribution of each part are studied, and the corresponding relationship between the excitation characteristics of silicon steel sheet and the no-load characteristic of transformer is deeply analyzed. The conventional calculation method of transformer no-load current and no-load loss is given. An equal ratio reduction model with the same magnetic density and structure as the core of UHV single-phase transformer under different proportion rated voltage is developed. A magnetic performance test system for silicon steel sheet is built with the core model as the test transformer. According to the requirements of IEC and GB, the test scheme of core model excitation performance under the condition of power frequency saturation excitation and DC bias magnetic field is designed respectively. According to the core model made by the three grades selected, the excitation characteristics under the condition of power frequency saturation excitation, DC bias excitation and repeated overexcitation are tested and analyzed, respectively. The results of the measurement under the power frequency saturation excitation are compared with the no-load loss and the no-load current of the core model calculated from the magnetic properties of the silicon steel sheet. The results show that there is a certain deviation between the normal calculation method and the measured value, in which the deviation of no-load loss is small and the deviation of no-load current is large, and the reference value is limited. The limitation of the traditional calculation method is reflected from the side. Based on the analysis and study of the no-load characteristics of three types of core models under different excitation conditions, a series of parameters for evaluating the excitation performance of silicon steel sheets with high magnetic induction orientation based on the core model are proposed. The excitation performance of three kinds of silicon steel sheets selected in this paper is evaluated by using this index. These indexes reflect the excitation performance of high magnetic inductive oriented silicon steel sheet under extreme application conditions such as deep excitation saturation and DC bias magnetic field, so that the excitation performance of oriented silicon steel sheet for UHV transformer can be more scientifically and reasonably evaluated. It has important engineering application value for core material selection of UHV transformer.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM275;TM41

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本文編號(hào)：2193151