CAJ | 학술논문

进行高电压等级的直流电阻标准分压器设计时,不仅要减小最大场强以保证绝缘,还要减小测量电阻层附近的场强,以减小电晕电流和泄漏电流对分压器准确度的影响。针对研制的1 000kV直流电阻标准分压器,建立了有限元模型,用有限元软件计算了分压器的电场分布以及沿测量电阻层外表面纵向方向上的电场分布。计算结果表明：均压环对高压电极附近的电场具有明显的改善作用,最大场强从7 775V/mm下降到了1 457V/mm,位置从电极上部转移到了辅均压环附近;增大辅均压环的小环半径,或使辅均压环和主均压环的包络线更加平滑,都能减小辅均压环附近的场强,通过优化设计,分压器的最大场强减小到了1 175V/mm;由于屏蔽电阻层的屏蔽作用,沿测量电阻层外表面纵向方向上的场强减小到了141V/mm,而且分布均匀。
진행고전압등급적직류전조표준분압기설계시,불부요감소최대장강이보증절연,환요감소측량전조층부근적장강,이감소전훈전류화설루전류대분압기준학도적영향。침대연제적1 000kV직류전조표준분압기,건립료유한원모형,용유한원연건계산료분압기적전장분포이급연측량전조층외표면종향방향상적전장분포。계산결과표명：균압배대고압전겁부근적전장구유명현적개선작용,최대장강종7 775V/mm하강도료1 457V/mm,위치종전겁상부전이도료보균압배부근;증대보균압배적소배반경,혹사보균압배화주균압배적포락선경가평활,도능감소보균압배부근적장강,통과우화설계,분압기적최대장강감소도료1 175V/mm;유우병폐전조층적병폐작용,연측량전조층외표면종향방향상적장강감소도료141V/mm,이차분포균균。
During the design of DC high voltage standard divider,it is necessary not only to meet insulation requirements by decreasing the maximum electric field strength,but also to decrease the interference on the divider's accuracy from leakage currents and corona currents by reducing the electric field strength around measuring resistor layer.Aiming at an established 1 000 kV DC voltage standard divider,a finite element model was established in the finite element software,then the electric field distribution of the divider and the electric field distribution along longitudinal direction of the outer surface of the measuring resistor layer was calculated.The results show that,the electric field around high voltage electrode is improved obviously by adding grading rings,e.g.the maximum electric field strength is lowered from 7 775 V/mm to 1 457 V/mm,and the position of the maximum electric field strength is changed from top of the high voltage electrode to around of the assistant grading ring;increasing radius of the assistant grading ring or smoothing the assistant grading ring and the main grading ring's envelope,either of the two methods can reduce the electric field strength around the assistant grading ring,e.g.according to calculation results,the maximum electric field strength of the 1 000kV DC voltage standard divider is reduced to 1 175V/mm with an optimal design;the electric field strength along longitudinal direction of the outer surface of the measuring resistor layer is reduced to 141V/mm and distributed uniformly because of the shielding effect of the shielding resistor layer.