【摘要】：隨著電氣化鐵路的快速發(fā)展,牽引變壓器的數(shù)量和容量變得越來越大,而我國電氣化鐵路牽引負(fù)荷率卻不高,使得牽引變壓器的空載損耗問題變得不容忽視。因此,牽引變壓器的節(jié)能研究就變得刻不容緩。相比于其他的變壓器節(jié)能技術(shù),卷鐵心技術(shù)在經(jīng)濟(jì)性與可行性等方面具有一定優(yōu)勢(shì)。節(jié)能型卷鐵心牽引變壓器采用卷鐵心技術(shù)為核心技術(shù)。該節(jié)能型卷鐵心牽引變壓器因其鐵心特殊性,利用常規(guī)的分析方法在仿真時(shí)會(huì)存在一些欠缺,而有限元法在仿真分析這類特殊結(jié)構(gòu)的變壓器時(shí)具有優(yōu)勢(shì)。以往的卷鐵心變壓器有限元研究多集中于農(nóng)網(wǎng)和城網(wǎng)配電變壓器等方面,就牽引變壓器而言,這類研究還比較缺乏。本文在Ansoft Maxwell中建立了節(jié)能型卷鐵心牽引變壓器的有限元模型,并對(duì)建模方法進(jìn)行了驗(yàn)證。運(yùn)用該有限元模型,主要完成了以下工作： 節(jié)能型卷鐵心牽引變壓器的空載試驗(yàn)及短路試驗(yàn)仿真。結(jié)合實(shí)際繞組的接線方式,設(shè)計(jì)并搭建了節(jié)能型卷鐵心牽引變壓器三維瞬態(tài)場(chǎng)有限元模型的外加激勵(lì)電路模型,利用有限元模型對(duì)節(jié)能型卷鐵心牽引變壓器進(jìn)行了仿真。仿真結(jié)果表明：與同等容量疊鐵心牽引變壓器相比,節(jié)能型卷鐵心牽引變壓器空載電流下降50%左右,空載損耗減少24%左右,短路電壓百分比也有所下降。仿真結(jié)果與理論分析結(jié)果相符。 鐵心溫度場(chǎng)仿真。運(yùn)用ANSYS Workbench仿真平臺(tái)搭建了節(jié)能型卷鐵心牽引變壓器的電磁—熱耦合仿真模型,結(jié)合過負(fù)荷曲線,對(duì)其在不同負(fù)荷情況下的鐵心溫度分布進(jìn)行了仿真。仿真結(jié)果表明該卷鐵心滿足牽引變壓器過負(fù)荷運(yùn)行要求。相比于同等容量的疊鐵心變壓器,節(jié)能型卷鐵心牽引變壓器鐵心內(nèi)溫度分布更加均勻,平均溫度更低,該仿真結(jié)果與卷鐵心磁通分布更加均勻的理論分析結(jié)果相符,同時(shí)也驗(yàn)證了溫度場(chǎng)仿真模型的正確性。
[Abstract]:With the rapid development of electrified railway, the number and capacity of traction transformers become larger and larger, but the traction load rate of electrified railway in China is not high, so the no-load loss problem of traction transformers can not be ignored. Therefore, the study of traction transformer energy conservation becomes urgent. Compared with other transformer energy saving technology, coiling core technology has some advantages in economy and feasibility. Energy-saving core-core traction transformer uses core-core technology as the core technology. Because of the particularity of the core, the conventional analysis method will have some shortcomings in the simulation, but the finite element method has the advantage in the simulation of this kind of special structure transformer. In the past, the finite element analysis of coiled core transformers is mainly focused on rural power networks and urban power distribution transformers, but in terms of traction transformers, this kind of research is still lacking. In this paper, the finite element model of energy saving core-core traction transformer is established in Ansoft Maxwell, and the modeling method is verified. By using the finite element model, the following works are accomplished: the no-load test and short-circuit test simulation of the energy-saving core-core traction transformer. Combined with the connection mode of the actual winding, the external excitation circuit model of the three-dimensional transient field finite element model of the energy-saving core-core traction transformer is designed and built, and the simulation of the energy-saving core-core traction transformer is carried out by using the finite element model. The simulation results show that compared with the same capacity stacked core traction transformer, the no-load current, no-load loss and short-circuit voltage percentage of energy-saving core-core traction transformer are reduced by about 50%, 24% and 24% respectively. The simulation results agree with the theoretical analysis results. Simulation of core temperature field. The electromagnetic and thermal coupling simulation model of energy-saving coil core traction transformer is built by using ANSYS Workbench simulation platform. The temperature distribution of the core is simulated under different load conditions combined with the overload curve. The simulation results show that the coil core meets the requirements of traction transformer overload operation. Compared with the stack core transformer of the same capacity, the temperature distribution in the core of the energy saving core-core traction transformer is more uniform and the average temperature is lower. The simulation results are consistent with the theoretical analysis of the more uniform magnetic flux distribution of the core-core. At the same time, the correctness of the simulation model of temperature field is verified.
【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】：2014
【分類號(hào)】：U224

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