气体绝缘开关设备(GIS)电缆终端的轴向传热特性对电缆资产的可靠性与利用率均有重要意义。文中建立GIS电缆终端等效热路模型,理论分析其传热特性与载流热点,通过搭建110 k V GIS电缆终端大电流实验平台,激励800~1 200 A稳态负荷电流,量...气体绝缘开关设备(GIS)电缆终端的轴向传热特性对电缆资产的可靠性与利用率均有重要意义。文中建立GIS电缆终端等效热路模型,理论分析其传热特性与载流热点,通过搭建110 k V GIS电缆终端大电流实验平台,激励800~1 200 A稳态负荷电流,量化分析其轴向传热特性与影响范围。结果显示,GIS电缆终端轴向传热程度与载荷大小正相关,当载荷为1 200 A时,至高点温度为93.0℃,最大轴向温差可达15.4℃,已超过电缆线路的额定载流量。分析表明,GIS电缆终端轴向传热明显,其影响范围为尾管后1 m左右,顶推弹簧截面处的导体为温度至高点,环境温度对GIS电缆终端与电缆本体影响权重等同并呈线性规律。研究结果可为电力调度及运行维护部门评估电缆线路载流量提供参考。展开更多
为了实现接头载流量的准确计算,提出了一种基于ANSYS的高压交流电缆接头载流量确定方法.该方法以绝缘长期耐受温度为限制条件,利用接头轴向二维有限元仿真模型计算载流量.仿真结果表明,当对流散热环境和负荷都相同时,相同导体截面的电...为了实现接头载流量的准确计算,提出了一种基于ANSYS的高压交流电缆接头载流量确定方法.该方法以绝缘长期耐受温度为限制条件,利用接头轴向二维有限元仿真模型计算载流量.仿真结果表明,当对流散热环境和负荷都相同时,相同导体截面的电缆接头导体温度高于电缆本体的导体温度,接头的载流能力低于同导体截面电缆的载流能力.为验证仿真模型精度,设计了接头载流量实验平台,对不同负荷下110 k V电缆接头稳态温度分布进行了实测.仿真与实验结果的对比表明,当接头导体温度超过绝缘长期耐受温度时,应用接头轴向二维有限元仿真模型计算压接管处导体温度的误差不超过1.0%,仿真计算的准确度能够满足工程应用的需求.最后,采用二分法算得110 k V 630 mm^2电缆接头载流量为1220A,比相同导体截面电缆本体在相同环境条件下的载流量减少了17.79%.研究结果表明:采用接头轴向二维有限元仿真模型计算载流量是可行的.展开更多
By using Galerkin’s method, the finite element formulation is made for axisymmtric heat transfer problems for anisotropic materials from the heat transfer differential equations expressed in terms of heat fluid densi...By using Galerkin’s method, the finite element formulation is made for axisymmtric heat transfer problems for anisotropic materials from the heat transfer differential equations expressed in terms of heat fluid density. Results of an example show that the heat transfer anisotropy has an important effect on temperature field.展开更多
A new model has been developed to predict the capillary limit of axial-grooved heat pipe.In the model the concepts of liquid saturation or liquid fraction of the cross-sectional area of groove,the modified relative pe...A new model has been developed to predict the capillary limit of axial-grooved heat pipe.In the model the concepts of liquid saturation or liquid fraction of the cross-sectional area of groove,the modified relative permeability,absolute permeability of groove and Leverrt’s function are used.The Leverrt’s function is well represented by the function f（s）=(1/51/2)（1/s-1）0.175.In the model the effects of gravitational force,capillary force and viscous force are considered.The calculated results are in good agreement with existing experimental data reported in the literature.展开更多
文摘气体绝缘开关设备(GIS)电缆终端的轴向传热特性对电缆资产的可靠性与利用率均有重要意义。文中建立GIS电缆终端等效热路模型,理论分析其传热特性与载流热点,通过搭建110 k V GIS电缆终端大电流实验平台,激励800~1 200 A稳态负荷电流,量化分析其轴向传热特性与影响范围。结果显示,GIS电缆终端轴向传热程度与载荷大小正相关,当载荷为1 200 A时,至高点温度为93.0℃,最大轴向温差可达15.4℃,已超过电缆线路的额定载流量。分析表明,GIS电缆终端轴向传热明显,其影响范围为尾管后1 m左右,顶推弹簧截面处的导体为温度至高点,环境温度对GIS电缆终端与电缆本体影响权重等同并呈线性规律。研究结果可为电力调度及运行维护部门评估电缆线路载流量提供参考。
文摘为了实现接头载流量的准确计算,提出了一种基于ANSYS的高压交流电缆接头载流量确定方法.该方法以绝缘长期耐受温度为限制条件,利用接头轴向二维有限元仿真模型计算载流量.仿真结果表明,当对流散热环境和负荷都相同时,相同导体截面的电缆接头导体温度高于电缆本体的导体温度,接头的载流能力低于同导体截面电缆的载流能力.为验证仿真模型精度,设计了接头载流量实验平台,对不同负荷下110 k V电缆接头稳态温度分布进行了实测.仿真与实验结果的对比表明,当接头导体温度超过绝缘长期耐受温度时,应用接头轴向二维有限元仿真模型计算压接管处导体温度的误差不超过1.0%,仿真计算的准确度能够满足工程应用的需求.最后,采用二分法算得110 k V 630 mm^2电缆接头载流量为1220A,比相同导体截面电缆本体在相同环境条件下的载流量减少了17.79%.研究结果表明:采用接头轴向二维有限元仿真模型计算载流量是可行的.
文摘By using Galerkin’s method, the finite element formulation is made for axisymmtric heat transfer problems for anisotropic materials from the heat transfer differential equations expressed in terms of heat fluid density. Results of an example show that the heat transfer anisotropy has an important effect on temperature field.
基金supported by the National Science Foundation of China
文摘A new model has been developed to predict the capillary limit of axial-grooved heat pipe.In the model the concepts of liquid saturation or liquid fraction of the cross-sectional area of groove,the modified relative permeability,absolute permeability of groove and Leverrt’s function are used.The Leverrt’s function is well represented by the function f（s）=(1/51/2)（1/s-1）0.175.In the model the effects of gravitational force,capillary force and viscous force are considered.The calculated results are in good agreement with existing experimental data reported in the literature.
