本文選題：變壓器　切入點(diǎn)：短路沖擊　出處：《西安交通大學(xué)學(xué)報(bào)》2017年10期

【摘要】：為了研究小容量電源條件下變壓器繞組在短路沖擊下的振動(dòng)特性,建立了基于沖擊電流發(fā)生器的變壓器短路沖擊振動(dòng)試驗(yàn)平臺(tái),根據(jù)一臺(tái)單相10/0.4kV變壓器的結(jié)構(gòu)參數(shù),利用場(chǎng)-路耦合的有限元算法,獲得了短路沖擊下變壓器繞組的電流變化規(guī)律,并與試驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了仿真方法的正確性。在此基礎(chǔ)上,提取高低壓繞組端部、中部線餅軸向電磁力的變化規(guī)律,利用瞬態(tài)動(dòng)力學(xué)獲得了高壓繞組不同線餅在沖擊電流下的振動(dòng)響應(yīng)。研究結(jié)果表明:三維有限元模型的場(chǎng)-路耦合算法可以準(zhǔn)確地獲得試驗(yàn)平臺(tái)的電流特性;短路沖擊下繞組軸向振動(dòng)最大加速度位于繞組高度的1/4和3/4位置處,可以在油箱表面正對(duì)該位置的區(qū)域進(jìn)行振動(dòng)監(jiān)測(cè);繞組同一線餅中墊塊間線匝振動(dòng)加速度大于墊塊所在位置的振動(dòng)加速度;由于慣性,繞組軸向振動(dòng)加速度最大值的時(shí)刻滯后于電流幅值最大的時(shí)刻。
[Abstract]:In order to study the vibration characteristics of transformer windings under short circuit impact under the condition of small capacity power supply, a transformer short circuit shock vibration test platform based on impulse current generator was established. According to the structural parameters of a single phase 10/0.4kV transformer,By using the field-circuit coupling finite element method, the current variation law of transformer windings under short circuit impact is obtained, and the correctness of the simulation method is verified by comparing with the experimental results.On this basis, the variation law of axial electromagnetic force at the end of the high and low voltage winding and the central wiper is extracted, and the vibration response of the high voltage winding under the shock current is obtained by using transient dynamics.The results show that the field-circuit coupling algorithm of 3D finite element model can accurately obtain the current characteristics of the test platform, and the maximum acceleration of the axial vibration of the winding under short-circuit impact is located at the position of 1 / 4 and 3 / 4 of the height of the winding.Vibration monitoring can be carried out on the surface of the tank; the vibration acceleration between the gaskets in the winding and the cake is greater than the vibration acceleration at the position where the gasket is located; because of inertia, the vibration acceleration between the gaskets is larger than the vibration acceleration in the position of the gasket.The moment of maximum axial vibration acceleration of winding lags behind the moment of maximum current amplitude.
【作者單位】： 廣東電網(wǎng)有限責(zé)任公司電力科學(xué)研究院;
【基金】：國(guó)家“863計(jì)劃”資助項(xiàng)目(2014AA032705) 南方電網(wǎng)科技專項(xiàng)資助項(xiàng)目(GDKJQQ20153006)
【分類號(hào)】：TM41

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本文編號(hào)：1693879