摘要
基于固体导热微分方程、对流换热方程、辐射换热方程建立NXAIR型开关柜电缆室的热传导、对流及辐射的多物理场耦合数学模型。同时,基于Navier-Stokes方程建立了电缆室内空气流场模型,考察空气流动的散热效果。以上数值计算通过Comsol软件利用有限元方法求解。计算结果表明,由于导电斑点和氧化膜的存在,电缆接头处温度较其他部位偏高,并且空气散热效果甚微,应成为监测重点。基于计算结果开发了一套开关柜电缆室温度在线监测系统。系统用红外传感器进行接头温度采集,以C8051F单片机为核心构建现场监测系统,并且基于Labview平台开发上位机软件,对数据进行有效管理。
A multi-physics coupling model of cable room in NXAIR switchgear is established based on the solid heat conduction equation,heat convection equation and heat radiation equation,while an air flow field model of cable room is established based on Navier-Stokes equation to study the heat dissipation effect. The FEM（Finite Element Method） is applied to solve these models with Comsol software. The calculative results show that,the cable joints have higher temperature because of the contact spots and oxide film and much slighter heat dissipation effect,which should be emphatically monitored. Based on the calculative results,an online temperature monitoring system is developed for the switchgear cable room,which applies the infrared sensors to sample the joint temperatures,takes MCU C8051F as its core and programs the superordinate unit software on Labview platform for effective data management.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第6期153-157,共5页
Electric Power Automation Equipment
基金
重庆市电力公司科技基金项目(2012-58)~~
关键词
开关柜
电缆
温度
传热
有限元
监测
模型
switchgear
electric cables
temperature
heat conduction
finite element
monitoring
models
