摘要
硅橡胶因其出色的绝缘性、抗电弧性和耐热性被广泛应用于绝缘子及其他绝缘元件的制造中。工程中常用安装硅橡胶绝缘护套的方法来提高电气设备的绝缘水平,但普通硅橡胶材料的热导率仅有0.27 W/(m·K),因此电气设备安装绝缘护套后的散热也成为亟需解决的问题。基于此,建立了电缆连接器配合绝缘护套的三维模型,基于有限元软件分析了绝缘护套的厚度、热导率、工作电流以及环境温度对其温度暂态变化的影响,并分析了热稳定状态下绝缘护套的三维轴向温度分布。结果表明:受金具温度系数的影响,绝缘护套界面温度的上升与工作电流和环境温度的增长呈指数关系;绝缘护套材料的热导率是影响其温度暂态变化和分布的主要因素。热导率越大,护套界面达到热平衡状态的时间点就越短,热量沿同一方向传导的距离就越长。
Silicone rubber is widely used in the manufacture of insulators and other insulating components due to its ex-cellent insulation,arc resistance,and heat resistance.In engineering,the method of installing silicone rubber insulation sheath is commonly used to improve the insulation level of electrical equipment,whereas,the thermal conductivity of or-dinary silicone rubber material is only 0.27 W/(m·K),therefore,the heat dissipation of electrical equipment after installing insulation sheath has also become an urgent problem to be solved.Based on this,this paper establishes a three-dimensional model of the cable connector with the insulating sheath.Based on the finite element software,the in-fluences of the thickness of the insulating sheath,thermal conductivity,working current and ambient temperature on its temperature transient changes are analyzed,and the three-dimensional axial temperature distribution of insulation sheath under thermal stability state is analyzed.The results show that,influenced by the temperature coefficient of the fittings,the rise of interface temperature of insulation sheath is non-linear with the increase of working current and ambient tem-perature.Thermal conductivity of insulating sheath material is the main factor affecting its temperature transient change and distribution.The higher the thermal conductivity is,the shorter the time for the sheath interface to reach thermal equi-librium will be,and the farther the heat will travel in the same direction.
作者
马磊
马建桥
漆志斌
曹盘盘
杨广泽
丁思瑜
MA Lei;MA Jianqiao;QI Zhibin;CAO Panpan;YANG Guangze;DING Siyu(College of Automation&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第8期3562-3571,共10页
High Voltage Engineering
基金
国家自然科学基金(52167019)
兰州交通大学“天佑创新团队”:轨道交通智能供电与状态感知(TY202010)。
关键词
高压设备箱
电缆连接器
绝缘护套
温度分布
温度暂态变化
high voltage equipment box
cable connector
insulating sheath
temperature distribution
temperature transient
