變壓器油中陰極放電起始過(guò)程的氣泡模型
發(fā)布時(shí)間：2018-10-22 09:04
【摘要】：為研究沖擊電壓下變壓器油中陰極放電起始過(guò)程的物理模型,統(tǒng)計(jì)分析了不同沖擊電壓下稍不均勻場(chǎng)中變壓器油的放電時(shí)延,利用Laue圖獲得了不同脈沖下的平均放電統(tǒng)計(jì)時(shí)延和放電形成時(shí)延,建立了稍不均勻場(chǎng)中陰極流注起始的"氣泡"模型:陰極表面微凸起處的場(chǎng)致發(fā)射電流加熱電極附近的液體;當(dāng)液體達(dá)到一定過(guò)熱度之后,過(guò)熱液體內(nèi)會(huì)產(chǎn)生氣泡核心,氣泡核心在場(chǎng)致發(fā)射電流的持續(xù)加熱作用下會(huì)膨脹生長(zhǎng),直至氣泡內(nèi)放電產(chǎn)生。利用過(guò)熱液體的汽化成核理論獲得了成核時(shí)間的數(shù)學(xué)表達(dá)式,并結(jié)合F-N理論獲得了放電統(tǒng)計(jì)時(shí)延和外施電場(chǎng)的關(guān)系式。結(jié)果表明,放電統(tǒng)計(jì)時(shí)延主要由電極附近過(guò)熱液體的成核時(shí)間和氣泡的膨脹形變時(shí)間組成,且成核時(shí)間占有主要部分;放電統(tǒng)計(jì)時(shí)延ts與間隙內(nèi)電場(chǎng)E滿足t_sE~3=ae~b/E。
[Abstract]:In order to study the physical model of cathode discharge initiation process in transformer oil under impulse voltage, the discharge delay of transformer oil in slightly uneven field under different impulse voltage is analyzed statistically. By using Laue diagram, the statistical delay of average discharge and the time delay of formation of discharge are obtained, and the bubble model of cathode flow initiation in slightly inhomogeneous field is established: the liquid near the electrode is heated by the field emission current at the micro-protruding point on the surface of the cathode; When the liquid reaches a certain degree of superheat, the bubble core will be produced in the superheated liquid, and the bubble core will expand and grow under the continuous heating of the field emission current until the discharge in the bubble is produced. The mathematical expression of nucleation time is obtained by using the vaporization nucleation theory of superheated liquids, and the relationship between the statistical time delay of discharge and the external electric field is obtained by combining the F-N theory. The results show that the statistical delay is mainly composed of the nucleation time of the superheated liquid near the electrode and the expansion deformation time of the bubble, and the nucleation time is the main part of the nucleation time, and the discharge statistical delay ts and the electric field E in the gap satisfy the t _ S _ E _ 3ae _ (b / E).
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院;
【分類號(hào)】：TM41
[Abstract]:In order to study the physical model of cathode discharge initiation process in transformer oil under impulse voltage, the discharge delay of transformer oil in slightly uneven field under different impulse voltage is analyzed statistically. By using Laue diagram, the statistical delay of average discharge and the time delay of formation of discharge are obtained, and the bubble model of cathode flow initiation in slightly inhomogeneous field is established: the liquid near the electrode is heated by the field emission current at the micro-protruding point on the surface of the cathode; When the liquid reaches a certain degree of superheat, the bubble core will be produced in the superheated liquid, and the bubble core will expand and grow under the continuous heating of the field emission current until the discharge in the bubble is produced. The mathematical expression of nucleation time is obtained by using the vaporization nucleation theory of superheated liquids, and the relationship between the statistical time delay of discharge and the external electric field is obtained by combining the F-N theory. The results show that the statistical delay is mainly composed of the nucleation time of the superheated liquid near the electrode and the expansion deformation time of the bubble, and the nucleation time is the main part of the nucleation time, and the discharge statistical delay ts and the electric field E in the gap satisfy the t _ S _ E _ 3ae _ (b / E).
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院;
【分類號(hào)】：TM41
【參考文獻(xiàn)】
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