基于FLUENT的示踪氦气在GIS绝缘空气中扩散规律及泄漏检测研究  

Research on the diffusion law and leakage detection of tracer helium in GIS insulated air based on FLUENT

作　　者：顾寅 缪金 肖焓艳 许鹏飞 王幸辉 GU Yin;MIAO Jin;XIAO Hanyan;XU Pengfei;WANG Xinghui(Wuxi Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd,Wuxi,Jiangsu 214000;Research Institute of State Grid Jiangsu Electric Power Co.,Ltd,Nanjing 211103;He’nan Relations Co.,Ltd,Zhengzhou 450001)

机构地区：[1]国网江苏省电力有限公司无锡供电分公司,江苏无锡214000 [2]国网江苏省电力有限公司电力科学研究院,南京211103 [3]河南省日立信股份有限公司,郑州450001

出　　处：《电气技术》2023年第6期42-46,56,共6页Electrical Engineering

基　　金：国网江苏省电力公司科技项目(B7103022304P);2020年国家电网有限公司科技项目(52200020002F)。

摘　　要：为控制温室效应,减少SF6气体的使用量,气体绝缘开关设备(GIS)开始尝试采用环保气体洁净空气作为绝缘介质,但气体压力必须满足额定压力要求。为能及时发现泄漏,在洁净空气中加入示踪氦气,通过监测示踪氦气来判定绝缘介质泄漏状态及泄漏点位置分布。结合洁净空气泄漏检测评估实验装置模型,基于FLUENT软件,采用SpaceClaim搭建二维气体传递现象模型,进行实际尺寸的GIS母线内洁净空气背景下充入不同压力示踪氦气后泄漏扩散分布规律的仿真研究。分析充入1kPa示踪氦气后,不同泄漏点位置示踪氦气的分布情况,以及不同泄漏点位置检测到氦气的时间顺序。结果显示,GIS母线内壁附近氦气浓度分布高于中间层区域,氦气分压为1kPa时,泄漏口A、B、C位置分别在50s、350s、850s时开始检测到示踪氦气的存在。示踪氦气泄漏的传感器检测实验结果显示,在A、B、C三个泄漏口检测到示踪氦气的时间分别为39s、313s、809s,与基于FLUENT的理论分析结果基本一致。母线内扩散平衡后三个泄漏口检测到的氦气体积分数均为1 402μL/L,与分压法配制的示踪氦气理论体积分数1 426μL/L吻合较好。该方法可为GIS中洁净空气泄漏检测及泄漏点传感器位置的优化布置提供理论参考。To control the greenhouse effect and reduce the use of SF6 gas,the gas insulated switchgear(GIS) is gradually trying to use environmentally friendly gas and clean air as the insulation medium,but the gas pressure must meet the rated pressure.In order to detect leakage in time,tracer helium is added into clean air to determine the leakage state of insulating medium and the location distribution of leakage points by monitoring the tracer helium.Combined with the clean air leakage detection and evaluation experimental device model,SpaceClaim is used to build a two-dimensional gas transfer phenomenon model based on FLUENT software,and the leakage diffusion distribution law after filling different pressure tracer helium in the clean air background in the GIS bus with actual size is simulated.After 1kPa of tracer helium is filled,the distribution of tracer helium at different leakage points and the time sequence of detection of helium at different leakage points are analyzed.The results show that the helium concentration near the inner wall of the GIS bus is higher than that in the interlayer area.When the partial pressure of helium is 1kPa,the presence of tracer helium is detected at positions A,B and C of the leakage port in the 50s,350s and 850s,respectively.The experimental results of sensor detection of tracer helium leak show that the detection time of tracer helium at the three leakage ports A,B and C are 39s,313s and 809s respectively,which is basically consistent with the theoretical analysis results based on FLUENT.The gas concentration detected at the three leakage ports after diffusion equilibrium in the bus is 1 402μL/L,which is in good agreement with the theoretical tracer helium concentration of 1 426μL/L prepared by partial pressure method.This method can provide theoretical reference for clean air leakage detection in GIS and the optimal location of leakage point sensor.

关 键 词：气体绝缘开关设备 洁净空气 示踪氦气 扩散分布 气体检测 

分 类 号：TM595[电气工程—电器]