首页|550 kV/8000 A大容量SF6充气式套管温升特性的仿真研究

550 kV/8000 A大容量SF6充气式套管温升特性的仿真研究

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为研究550 kV/8000 A大容量SF6充气套管的温升特性,建立了550 kV/8000 A大容量SF6充气套管多物理场耦合模型,利用 ANSYS 软件,综合考虑涡流效应、集肤效应、重力作用、热对流、热辐射等因素,计算分析了1.1倍额定电流(8000 A),即8800 A电流条件下套管的温度场与气流场分布规律,并进行了550 kV/8000 A SF6充气套管的温升试验,验证了仿真结果的正确性.最后仿真分析了外部风速、气体压强、负载电流、中心导体外径等 4 种影响因素对套管温升特性的影响.研究结果表明:最高温度位于套管内中心导体上部的小孔下方,最高温度为363 K,从整体角度看,套管上方的温度高于下方;仿真结果与试验结果一致性较好,误差在8%以内;套管的温升随外部风速的增大明显降低,但降幅逐渐减小;套管的温升随着气体压强的增大而降低;电流越大,产生的焦耳热越多,负载电流直接影响导体温升;套管的温升随着中心导体外径的减小而增大.研究内容为大容量高压SF6充气套管的设计工作提供了理论借鉴.
Simulation Research on Temperature Rise Characteristics of 550 kV/8000 A Large Capacity SF6 Inflatable Bushing
To study the temperature rise characteristics of 550 kV/8000 A large-capacity SF6 inflatable bushing,a mul-ti-physics field coupling model of 550 kV/8000 A large-capacity SF6 inflatable bushing was established in this paper.The eddy current effect,skin effect,gravity effect,thermal convection,thermal radiation,and other factors are comprehen-sively taken into consideration,and 1.1 times the current(8000 A)was calculated and analyzed by using ANSYS software,that is,the distribution law of the temperature field and airflow field of the bushing under the condition of 8800 A current,and the temperature rise test of 550 kV/8000 A SF6 inflatable bushing was carried out to verify the correctness of the sim-ulation results.Finally,the effects of four influencing factors,such as external wind speed,gas pressure,load current,and outer diameter of the center conductor,on the temperature rise characteristics of the bushing were simulated and analyzed.The research results show that the maximum temperature is located below the small hole in the upper part of the central conductor in the bushing,the maximum temperature is 363 K,and the temperature above the bushing is higher than below from an overall perspective.The simulation results are in good agreement with the experimental results,and the error is within 8%.The temperature rise of the bushing decreases significantly with the increase of the external wind speed,but the degree of declining gradually decreases.The temperature rise of the bushing decreases with the increase of the gas pressure.As the current increases,more Joule heat is generated,and the load current directly affects the conductor tem-perature rise.The temperature rise of the bushing increases as the outer diameter of the center conductor decreases.The research content of this paper can provide theoretical reference for the design of large-capacity high-pressure SF6 inflata-ble bushing in the future.

SF6 inflatable bushingtemperature rise characteristicsmulti-physics field couplingtemperature fieldair-flow fieldtemperature rise testinfluencing factors

王流火、陶雄武、周俊宏、王海燕、谢榕昌、熊志武

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广东电网有限责任公司,广州 510410

广东电网有限责任公司惠州供电局,惠州 516001

SF6充气套管 温升特性 多物理场耦合 温度场 气流场 温升试验 影响因素

2024

高电压技术
中国电力科学研究院 中国电机工程学会

高电压技术

CSTPCD北大核心
影响因子:2.32
ISSN:1003-6520
年,卷(期):2024.50(3)
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