高海拔地区750KV输电线路均压环的有限元分析及优化设计

发布时间：2018-06-17 18:11

本文选题：高海拔地区 + 750kv复合绝缘子　；参考：《青海大学》2014年硕士论文

【摘要】：近年来，硅橡胶复合绝缘子作为一种新型绝缘材料以其防污性能高、绝缘性能好和结构轻便、加装方便等优点被广泛的使用于电压等级较高的输电线路中，特别是在西北地区750kV输电线路中得到了大量的应用。复合绝缘子在使用过程中出现的脆断、界面击穿、老化等问题与绝缘子电场分布不均等都与其特殊的结构有紧密联系。高海拔地区对于绝缘性能有更高的要求，所以需要研究沿复合绝缘子串的电场电位分布，通过优化均压环的结构参数来控制复合绝缘子的电场电压分布情况，避免放电事故的发生，，保障其安全运行。本文对西宁—格尔木750kV输电线路中使用的均压环进行了研究。各国对高海拔环境下的外绝缘性能并未有统一的规定，因此本文提出了一种更适用于高海拔地区的海拔校正系数计算方法。并选择有限元法仿真原理，对在平均海拔高度为3000米地区使用的交流750kV复合绝缘子配套使用的均压环进行仿真。分析了绝缘子在无均压环时和有均压环时的复合绝缘子沿面电场强度分布和电压分布，并就均压环的环径，管径和抬高距离对绝缘子电场分布的影响规律，从均匀电场角度得出合理的均压环结构参数。计算结果表明，均压环的使用能够显著地改善绝缘子表面电场分布，可将复合绝缘子高压端、均压环和金具等表面的最大电场强度峰值控制在高海拔地区输电线路外绝缘场强最大值以下，优化后的均压环能够满足高海拔地区750kV输电线路对复合绝缘子的使用要求。研究结果为750kV交流输电线路的外绝缘设计提供参考。
[Abstract]:In recent years, as a new type of insulating material, silicone rubber composite insulator has been widely used in transmission lines with high voltage grade due to its advantages of high pollution resistance, good insulation performance, light structure, convenient installation and so on. Especially in the northwest area 750 kV transmission line has been a large number of applications. The brittle fracture, interfacial breakdown and aging of composite insulators are closely related to the uneven distribution of the electric field of the insulators. In the high altitude area, the electric field potential distribution along the composite insulator string should be studied, and the electric field voltage distribution of the composite insulator should be controlled by optimizing the structure parameters of the voltage sharing ring. Avoid the occurrence of discharge accident and ensure its safe operation. In this paper, the voltage sharing ring used in Xining-Golmud 750 kV transmission line is studied. There is no uniform regulation on the external insulation performance at high altitude, so this paper puts forward a method for calculating the elevation correction coefficient which is more suitable for the high altitude area. The simulation principle of finite element method is selected to simulate the voltage sharing ring of AC 750kV composite insulator used in the area with an average altitude of 3000 meters. The distribution of electric field intensity and voltage along the surface of composite insulator with and without uniform voltage ring is analyzed. The influence of ring diameter, pipe diameter and elevation distance on the electric field distribution of insulator is analyzed. From the angle of uniform electric field, the reasonable structural parameters of the uniform pressure ring are obtained. The results show that the electric field distribution on the surface of the insulator can be significantly improved by the use of the equalizing ring, and the high voltage end of the composite insulator can be changed. The peak value of the maximum electric field intensity on the surface of the equalizing ring and the hardware is controlled below the maximum value of the external insulation field strength of the transmission line at high altitude, and the optimized equalizing voltage loop can meet the requirements of the composite insulator for the 750kV transmission line in the high altitude area. The results provide a reference for the external insulation design of 750 kV AC transmission lines.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM216

【共引文献】