本文選題：高海拔地區(qū) + 750kv復合絕緣子��； 參考：《青海大學》2014年碩士論文

【摘要】：近年來，硅橡膠復合絕緣子作為一種新型絕緣材料以其防污性能高、絕緣性能好和結(jié)構(gòu)輕便、加裝方便等優(yōu)點被廣泛的使用于電壓等級較高的輸電線路中，特別是在西北地區(qū)750kV輸電線路中得到了大量的應用。復合絕緣子在使用過程中出現(xiàn)的脆斷、界面擊穿、老化等問題與絕緣子電場分布不均等都與其特殊的結(jié)構(gòu)有緊密聯(lián)系。高海拔地區(qū)對于絕緣性能有更高的要求，所以需要研究沿復合絕緣子串的電場電位分布，通過優(yōu)化均壓環(huán)的結(jié)構(gòu)參數(shù)來控制復合絕緣子的電場電壓分布情況，避免放電事故的發(fā)生，，保障其安全運行。 本文對西寧—格爾木750kV輸電線路中使用的均壓環(huán)進行了研究。各國對高海拔環(huán)境下的外絕緣性能并未有統(tǒng)一的規(guī)定，因此本文提出了一種更適用于高海拔地區(qū)的海拔校正系數(shù)計算方法。并選擇有限元法仿真原理，對在平均海拔高度為3000米地區(qū)使用的交流750kV復合絕緣子配套使用的均壓環(huán)進行仿真。分析了絕緣子在無均壓環(huán)時和有均壓環(huán)時的復合絕緣子沿面電場強度分布和電壓分布，并就均壓環(huán)的環(huán)徑，管徑和抬高距離對絕緣子電場分布的影響規(guī)律，從均勻電場角度得出合理的均壓環(huán)結(jié)構(gòu)參數(shù)。 計算結(jié)果表明，均壓環(huán)的使用能夠顯著地改善絕緣子表面電場分布，可將復合絕緣子高壓端、均壓環(huán)和金具等表面的最大電場強度峰值控制在高海拔地區(qū)輸電線路外絕緣場強最大值以下，優(yōu)化后的均壓環(huán)能夠滿足高海拔地區(qū)750kV輸電線路對復合絕緣子的使用要求。研究結(jié)果為750kV交流輸電線路的外絕緣設計提供參考。
[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.
【學位授予單位】：青海大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM216

【共引文獻】

相關碩士學位論文 前1條

1 湯麗文;幾種丁腈橡膠與變壓器油交互作用機理研究[D];沈陽工業(yè)大學;2013年

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