高寒地区GIS的适应性研究  

Study on Adaptability of GIS in Extreme Cold Region

作　　者：秦晓宇 吕寻浩 陈玉 苏戈 李松磊 刘分 张涛锋 QIN Xiaoyu;LYU Xunhao;CHEN Yu;SU Ge;LI Songlei;LIU Fen;ZHANG Taofeng(Pinggao Group Co.,Ltd.,Henan Pingdingshan 467001,China;State Grid Linyi Power Supply Company,Shandong Linyi 276000,China)

机构地区：[1]平高集团有限公司,河南平顶山467001 [2]国网山东省电力公司临沂供电公司,山东临沂276000

出　　处：《高压电器》2021年第6期72-78,85,共8页High Voltage Apparatus

基　　金：国家电网有限公司总部科技项目资助(适用于特殊环境工况下高可靠性GIS开关设备研制)。

摘　　要：近年来,GIS在国内得到广泛应用,特别是超特高压电网的建设更进一步扩大了GIS的应用地域,在我国东北、西北环境温度均为低温环境,而过低的温度会对GIS设备产生不利影响,从而影响输变电设备的安全。SF_(6)气体以其优异的绝缘性能和灭弧性能,大量应用在高压组合电器中,但SF_(6)气体较大的分子量决定了其较高的液化温度。在气体液化后,会使气室内的气体密度大幅降低,从而对设备绝缘性能产生不利影响。文中对SF_(6)低温特性进行了分析,提出采用加热器提高气体温度,防止SF_(6)气体液化的方法。针对低温地区所发生的凝露现象进行了分析,研究了采用空气对流抑制凝露的方法,完成汇控柜防凝露设计。通过对"O"型密封圈的材料研究,选用适当添加剂实现低温橡胶的混炼,部分解决了低温密封问题。In recent years,GIS has been used widely in China,especially the construction of UHV power grid has expanded the application area of GIS further.The ambient temperature in both Northeast and Northwest China is low temperature environment.The excessive low temperature will bring about adverse effects on GIS equipment,thus affecting the safety of power transmission and transformation equipment.SF_(6) gas is used widely in high voltage gas insulated metal enclosed switchgear due to its excellent dielectric and interruption performance.However,the higher liquefaction temperature of SF_(6) gas is determined by its larger molecular weight.The gas,after liquefaction,can reduce greatly the gas density in the gas compartment,thus adversely affecting the dielectric performance of the equipment.In this paper,the low temperature characteristics of SF_(6) is analyzed and the method of improving the gas temperature and preventing liquefaction of SF_(6) gas by way of adopting heater is proposed.The condensation phenomena in the low temperature region are analyzed.The method of using air convection to suppress condensation is studied and anti-condensation design of control cabinet is completed.Throughout study of material of"O"ring,selection of appropriate additives to achieve the mixing of low temperature rubber partially solves the sealing problem at low temperature.

关 键 词：组合电器 低温 SF_(6)气体液化 凝露 低温橡胶 

分 类 号：TM595[电气工程—电器]