气体绝缘开关(GIS)是输配电中重要电气设备,其工作的稳定性将直接关系到电网的安全稳定运行。不但开关内部通流与故障发热会导致罐体外壳温升,而且外部太阳辐射也会影响外壳温度分布,对以温度为判据的故障检测系统造成干扰。采用有限元仿真、样机试验和现场试验结合的探究方法,综合考虑集肤效应、涡流效应、重力作用、对流散热、辐射散热等因素,重点研究GIS断路器在太阳辐射下的温度场分布情况。结果表明,太阳辐射会大幅影响GIS外壳温升,且随着太阳直射角度和强度的变化而变化 ...
陈新城 +5 more
doaj
当火灾中钢框架柱不均匀受火时,会在截面和高度方向产生温度梯度。现行规范给出了火灾中钢构件升温的计算公式,但这些公式均是基于温度沿构件高度和截面均匀分布的假设。采用有限元方法研究了火灾中两相邻面受火钢柱的截面温度场,火灾场景采用ISO834标准升温曲线,钢柱采用非膨胀型防火涂料保护。对于所研究的两相邻面受火钢柱,沿截面宽度和高度方向均存在温度梯度。基于参数分析结果,对欧洲规范EN 1993-1-2中钢构件升温计算公式进行了修正,来计算两相邻面受火钢柱截面各部分的升温曲线。
夏金环, 王培军, 周吉学
doaj
由凝露引起的开关柜事故屡见不鲜,而温度和湿度是引起凝露现象的主要因素。基于能量、动量、质量以及组分守恒定律,构建了高压开关柜电缆室热传导、空气对流以及水蒸气扩散影响下的温湿度场数学模型,并利用有限元软件Comsol进行数值计算分析,研究其温度、湿度分布规律以及凝露与温度、湿度的关系。结果表明:由于自身发热,电缆处的温度最高,同时,电缆室空气温度在热传导、对流换热作用下也逐渐升高;而湿度的分布受水蒸气的扩散和温度的综合影响,呈现先增大后减小的趋势,与温度的分布大致相反;且温度差越大,相对湿度越高 ...
刘云鹏, 郭沁
doaj
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Kang B +5 more
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[Development and electrophysiological validation of a temporal interference transcranial magnetic stimulation system for mice]. [PDF]
Cui C, Wang T, Zhang Y, Zheng W, Xu G.
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Hou L +6 more
europepmc +1 more source
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[Diabetic foot care: full-lifecycle management driven by digital intelligent technologies]. [PDF]
Chen L, Ran X.
europepmc +1 more source

