CAJ | 학술논문

针对固体介质中不同微空气隙形状（球体，椭球体）内部电场计算问题，将其简化为计算均匀电场中介质球、介质椭球内的电场，应用电介质极化原理，得到了微空气隙内部电场分布的数值解。数值计算结果表明：气隙内的场强总要比固体内的场强高得多，而气隙的介电强度比固体介质低，所以当加至一定电压时，在固体介质击穿之前，总是在空气隙内先开始放电，从理论上解释了固体内部发生局部放电的原因。
침대고체개질중불동미공기극형상（구체，타구체）내부전장계산문제，장기간화위계산균균전장중개질구、개질타구내적전장，응용전개질겁화원리，득도료미공기극내부전장분포적수치해。수치계산결과표명：기극내적장강총요비고체내적장강고득다，이기극적개전강도비고체개질저，소이당가지일정전압시，재고체개질격천지전，총시재공기극내선개시방전，종이론상해석료고체내부발생국부방전적원인。
This paper deals with the calculation of the electric field in micro-air gaps of different shapes of the solid dielectric and it reduces the complicated problem to calculating the electric field of dielectric sphere and ellipsoid in the uniform field. And by applying the dielectric polarization theory,the paper obtains a numerical solution of the distribution of the electric field in micro-air gaps. The calculation results show that the electric field in micro-air gaps is much higher than in the solid,but the dielectric strength in the micro-air gaps is lower than in the solid,therefore when the voltage rises to a certain level, the micro-air gap always begins to discharge before the breakdown of the solid dielectric,which theoretically explains the reasons of the partial discharge in solid.