CAJ | 학술논문

复合横担首次应用于国内750 kV线路,由于电压等级高,结构复杂,均压、均场问题突出,需要对其均压特性进行深入研究.运用三维有限元分析软件ANSYS,考虑杆塔、大地、导线以及相间影响等因素,计算了复合横担在不同设计方案下的电位、电场分布,研究了中间法兰以及横担端部配置均压环、屏蔽环对复合横担电位分布的影响,对比了750 kV线路直线塔绝缘子串与复合横担的电位分布.复合横担最终选择在最初设计方案的基础上取消悬垂串、增加横担长度并配置合理的均压屏蔽装置的方案,其电位分布优于750 kV线路直线塔.经过中国电力科学研究院电气试验验证,复合横担电气性能良好,满足运行要求.
복합횡담수차응용우국내750 kV선로,유우전압등급고,결구복잡,균압、균장문제돌출,수요대기균압특성진행심입연구.운용삼유유한원분석연건ANSYS,고필간탑、대지、도선이급상간영향등인소,계산료복합횡담재불동설계방안하적전위、전장분포,연구료중간법란이급횡담단부배치균압배、병폐배대복합횡담전위분포적영향,대비료750 kV선로직선탑절연자천여복합횡담적전위분포.복합횡담최종선택재최초설계방안적기출상취소현수천、증가횡담장도병배치합리적균압병폐장치적방안,기전위분포우우750 kV선로직선탑.경과중국전력과학연구원전기시험험증,복합횡담전기성능량호,만족운행요구.
It is the first time in China to apply composite cross-arms in 750kV AC transmission system, and in view of its high voltage grade and complex structure the uneven distribution of potential and electric field in 750 kV AC transmission system have to be researched in depth. Utilizing three-dimensional finite element analysis software ANSYS and considering influences of such factors as tower, earth, wires and inter-phase interaction, the distributions of potential and electric field under different design schemes are researched, and the influences of spacer flange and grading ring and sharing ring, which are configured at the terminals of the cross-arm, on potential distribution on composite cross-arm, meanwhile the potential distribution on insulator string for 750kV suspension tower and the potential distribution on composite cross-arm are contrasted. Based on the first design scheme of the cross-arm, a final scheme for the composite cross-arm is chosen, in which the suspension insulator string is canceled, the length of composite cross-arm is prolonged and the grading and shielding devices are configured reasonably, thus the potential distribution of the composite cross-arm is better than that of suspension tower. Verification results of electrical tests performed by China EPRI show that the composite cross-arm adopting the finally chosen scheme possesses good electrical performances that can meet operational requirements.