CAJ | 학술논문

为了避免对局放测量产生干扰，应控制均压环表面最大场强Emax，使其不起晕。以常州东芝变压器有限公司正在研发的±500kV换流变阀侧Y绕组套管端部试验用均压环的设计为例，探究了双环结构均压环的3个尺寸参数——环径D、管径d和两环中心距H对均压环表面最大场强的影响，并推荐了超／特高压变压器套管端部双环结构试验用均压环设计的一般步骤。最后，探讨了均压环的安装位置对其屏蔽效果的影响。研究结果表明，3个尺寸参数中，对均压环表面最大场强起决定作用的是d，最大场强随着d的增大而降低，D和H对最大场强的影响不显著；并且当套管端部位于均压环轮廓线所围区域的中央时，套管端部场强最低，均压环的屏蔽效果最好。
위료피면대국방측양산생간우，응공제균압배표면최대장강Emax，사기불기훈。이상주동지변압기유한공사정재연발적±500kV환류변벌측Y요조투관단부시험용균압배적설계위례，탐구료쌍배결구균압배적3개척촌삼수——배경D、관경d화량배중심거H대균압배표면최대장강적영향，병추천료초／특고압변압기투관단부쌍배결구시험용균압배설계적일반보취。최후，탐토료균압배적안장위치대기병폐효과적영향。연구결과표명，3개척촌삼수중，대균압배표면최대장강기결정작용적시d，최대장강수착d적증대이강저，D화H대최대장강적영향불현저；병차당투관단부위우균압배륜곽선소위구역적중앙시，투관단부장강최저，균압배적병폐효과최호。
In order not to disturb the measurement of PD, the maximum electric field intensity （Emax ） on the surface of grading rings must be controlled, so that the corona will not be generated. We introduced the design process of grading rings used in the ± 500 kV converter transformer which was under development by Changzhou Toshiba Transformer Co. , Ltd, and researched the effect of the three main geometric parameters, such as the ring diameter D, the cross section diameter d, and the distance between two rings H, on E Then we recommended a general procedure of designing the dual-ring-structure grading rings. Finally, we discussed the shielding effectiveness of the grading rings under different installation location. The results show that , of the three main geometry parameters, d plays a decisive role in controlling E on the surface of grading rings, and Emax lowers as d becomes lager. How- ever, the influence of D and H on Emax is insignificant. Meanwhile, when the head of the bushing is located at the center of the space enclosed by the two rings, the shielding effectiveness is the best.