CAJ | 학술논문

为了阐明液体电介质在冲击电压作用下空间电荷的动态过程及其对电介质击穿性能的影响，采用基于克尔电光效应的方法，测量了在操作冲击电压作用下碳酸丙烯酯液体电介质中空间电荷的注入与输运过程。实验结果显示了碳酸丙烯酯在电场作用下强烈的空间电荷效应，双极同极性电荷注入加强了对极板的屏蔽作用，降低了电极附近的电场，从而提高了平板电极间液体的击穿性能。根据实验结果，建立了双极同极性空间电荷注入与输运模型，通过该模型计算了电场、空间电荷、介质电导率和能量耗散密度随时间和空间位置的分布，及注入电流随时间的变化规律。仿真结果与克尔电光测量结果较吻合，模型验证了液体中空间电荷注入是由双电层引起的，并与液体中电化学过程共同决定了空间电荷的输运过程。
위료천명액체전개질재충격전압작용하공간전하적동태과정급기대전개질격천성능적영향，채용기우극이전광효응적방법，측량료재조작충격전압작용하탄산병희지액체전개질중공간전하적주입여수운과정。실험결과현시료탄산병희지재전장작용하강렬적공간전하효응，쌍겁동겁성전하주입가강료대겁판적병폐작용，강저료전겁부근적전장，종이제고료평판전겁간액체적격천성능。근거실험결과，건립료쌍겁동겁성공간전하주입여수운모형，통과해모형계산료전장、공간전하、개질전도솔화능량모산밀도수시간화공간위치적분포，급주입전류수시간적변화규률。방진결과여극이전광측량결과교문합，모형험증료액체중공간전하주입시유쌍전층인기적，병여액체중전화학과정공동결정료공간전하적수운과정。
In order to illustrate the dynamic behavior of space charge in liquid dielectric under impulse voltage and its impact on the breakdown characteristic, this paper measured the process of space charge injection and transport in propylene carbonate under switching impulse voltage based on the method of Kerr electro-optic effect. The experiment results have shown strong space charge effects in high-voltage stressed propylene carbonate. The bipolar homocharge case lowers the electric field at both electrodes due to space charge shielding and allows a higher voltage without breakdown. According to the experimental results, the bipolar charge injection model was developed. Based on this model, the distributions of time and space dependent electric field, space charge, liquid conductivity, power dissipation density and the time dependent current density of charge injection were obtained. The simulation results coincide with the measurements by using Kerr method. The model proves that the double electrode layer causes the charge injection at first, and together with electrochemical process, decides the charge transport in liquid.