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OFAF冷却方式下换流变压器内部传热特性研究

Gaoya dianqi
随着换流变压器额定负荷的增加，其内部绕组的散热问题愈来愈受到重视。文中针对某北方高压直流输电换流站内换流变压器，研究了OFAF（强迫油循环风冷）冷却方式下进口油流量，进口油温等因素对变压器内部流动传热的影响规律，提出了能够强化传热的导流板设计方案。研究结果表明，进口油温20 ℃时，使内部散热效果达到最佳状态的最小冷却油流量为7.5 kg/s；进口油温升高会引起冷却油粘度大幅降低，使得绕组内部相对温升反而降低；增加导流挡板能够有效强化变压器内部传热，导流板完全封闭时在额定工况下可以使顶油温度下降约9 ...
杨晨, 刘志远, 李早阳, 刘立军
doaj  

[Performance evaluation of different filtration fractions during daytime continuous renal replacement therapy]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Wang L, Chen Y, Xu G, Xu C.
europepmc   +1 more source

[A signal sensing system for monitoring the movement of human respiratory muscle based on the thin-film varistor]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Yuan Y, Zhang Z, Xie L, Huang H, Liu W.
europepmc   +1 more source

[Development and electrophysiological validation of a temporal interference transcranial magnetic stimulation system for mice]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Cui C, Wang T, Zhang Y, Zheng W, Xu G.
europepmc   +1 more source

[Research progress on flexible wearable sensors for health monitoring]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Chen X, Xu G.
europepmc   +1 more source

[Researches and clinical translation of smart dressings]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Lyu GZ, Zhao P.
europepmc   +1 more source

基于三维隔震支座的换流变压器地震响应分析

Gaoya dianqi
换流变压器作为换流站内的核心设备，其水平斜向伸出箱体的阀侧套管受竖向地震作用影响显著。为提高换流变压器的抗震性能，提出由滑动摩擦摆水平隔震系统、弹簧—粘滞阻尼器竖向隔震系统、抗摇摆装置组成的三维隔震支座，并将其应用于±800 kV换流变压器，通过有限元数值模拟，计算并分析了设置隔震支座前后换流变压器的地震响应。结果表明：三维隔震支座显著降低了阀侧套管水平向和竖向加速度响应；相较于水平隔震，设置三维隔震系统的阀侧套管根部应力隔震效率提升了约12%；隔震体系位移响应主要集中在支座 ...
何堃宁, 邓扬阳, 谢靖, 谢强
doaj  

[Advances in application of digital orthopedic technology in total hip arthroplasty for developmental dysplasia of hip]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Zhang B, Li H, Li M, Kong X, Chai W.
europepmc   +1 more source

[Valve-in-valve transcatheter mitral valve replacement with SAPIEN 3 valve for bioprosthetic mitral valve failure: one-year outcomes in 26 patients]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Ran Z, Liu L, Shi J, Wang Y, Cao T, He S, Li X, Guo Y.   +7 more
europepmc   +1 more source

[Development of a balloon sensor device for force-electrical coupling measurement of esophagus]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Ran P, Zhong Y, Lai Y, Liu L, Zhu Y, Zhu H.   +5 more
europepmc   +1 more source