CAJ | 학술논문

交流电压作用下，由于复合绝缘子导线侧和杆塔侧的杂散电容不同，绝缘子的沿串电压分布不均匀。采用三维有限元方法分别计算了特高压交流1000 kV单回和双回输电线路一字型4联550 kN复合绝缘子耐张串的沿面电位和电场分布，比较了大环屏蔽深度、管径、外径等均压环结构参数对电场分布的影响，给出了均压环的推荐配置方案。结果表明，当中相施加相电压峰值时，各关键部位场强值最大；单回和双回耐张串均压环表面最大场强分别为2.06 kV/mm 和1.8 kV/mm，绝缘子伞裙护套表面最大场强分别为0.33 kV/mm和0.31 kV/mm，满足均压环表面场强在峰值下不超过2 kV/mm，复合绝缘子伞裙护套表面场强在有效值下不超过0.4 kV/mm的电场控制要求。
교류전압작용하，유우복합절연자도선측화간탑측적잡산전용불동，절연자적연천전압분포불균균。채용삼유유한원방법분별계산료특고압교류1000 kV단회화쌍회수전선로일자형4련550 kN복합절연자내장천적연면전위화전장분포，비교료대배병폐심도、관경、외경등균압배결구삼수대전장분포적영향，급출료균압배적추천배치방안。결과표명，당중상시가상전압봉치시，각관건부위장강치최대；단회화쌍회내장천균압배표면최대장강분별위2.06 kV/mm 화1.8 kV/mm，절연자산군호투표면최대장강분별위0.33 kV/mm화0.31 kV/mm，만족균압배표면장강재봉치하불초과2 kV/mm，복합절연자산군호투표면장강재유효치하불초과0.4 kV/mm적전장공제요구。
Due to the different stray capacitance at conductor and grounding top of composite insulators under AC voltage, the electric potential distribution along the insulators is un-uniform. The three-dimensional finite element method is used to calculate the potential distribution and electric field distribution of line-shape 4×550 kN composite tension insulators for 1 000 kV UHVAC transmission lines, where single and double circuit is calculated respectively. The impacts of structural parameters of grading ring, including shielding depth, ring diameter and tube diameter, on the distribution of electric field are compared and a recommended configuration scheme of grading ring is suggested. Calculation results show that when peak phase voltage is applied to the middle phase, the electric field strengths at key positions reach to their maximum; on single circuit 1 000 kV transmission line, the maximum electric filed strength on grading ring surface and insulator surface are 2.06 kV/mm and 0.33 kV/mm respectively, while they are 1.8 kV/mm and 0.31 kV/mm of double circuit 1 000 kV transmission lines respectively. All the calculation results under the suggested grading ring configuration meet the electric filed requirements, which are 2 kV/mm on grading ring surface under peak phase voltage and 0.4 kV/mm on insulator surface under effective value.