Results 101 to 110 of about 4,327 (153)

水分对交直流复合电压下油纸绝缘沿面放电特性影响研究

Gaoya dianqi, 2018
换流变压器阀侧绕组绝缘同时承受交流和直流电压作用,水分是导致围屏爬电的重要原因之一,开展水分含量对油纸绝缘沿面放电特性影响的研究具有重大意义。文中利用基于脉冲电流法的局部放电测量系统,在含不同直流分量的交直流复合电压下,使用典型球—板电极对不同水分含量油纸绝缘试品的沿面放电特征参量和统计谱图变化规律开展了实验研究,并与纯交流电压下的结果进行了对比。研究结果表明:随着纸板中水分含量的不断升高,起始放电电压和闪络电压均呈现下降趋势,放电耐受时间不断缩短;在同一水分含量下,随着复合电压中直流分量的不断增大 ...
李熙宁, 汲胜昌, 崔彦捷, 祝令瑜, 肖尧, Jedsada Kridsananont   +5 more
doaj  

直流单极运行对500kV交流变压器的影响

Gaoya dianqi, 2011
随着高压直流输电技术的发展和西电东送规模的扩大,将会有越来越多的高压直流输电线路和换流站投入运行。当高压直流单极运行时,其大地回路直流电流会影响500 kV交流变压器的运行,例如:变压器噪音明显增大,出现过热现象,甚至引起变压器损坏。惠州电网目前有1个换流站,2个500 kV变电站,直流单极运行时会对该2个变电站的变压器造成不同程度的影响。笔者从理论上分析了高压直流输电单极运行时对500 kV交流变压器影响的原理,并结合目前惠州电网的情况提出几点抑制流入变压器中性点地中直流的措施。
叶杰宏
doaj  

[Study on the electric field transmission characteristics of conducted-electrode tumor treating fields]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Liu K, Zhang J, Shi J, Fang H, Li X.
europepmc   +1 more source

[Master manipulator of vascular intervention surgical robot based on haptic feedback]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Han G, Sun Z, Tang X.
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

[Effects of cold atmosphere plasma treatment on the biological behavior of human gingival fibroblasts]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Zheng M, Ma X, Chen H, Zhao H, Zhang Y, Tan J, Li H, Wang X.   +7 more
europepmc   +1 more source

[Extracellular matrix materials and tissue regeneration and repair]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Zhao L, Xie H.
europepmc   +1 more source

[How I treat vasovagal syncope in children]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Zou RM, Wang C.
europepmc   +1 more source

[Rehabilitation guidelines and specifications for traumatic spinal cord injury (2025 edition)]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Professional Committee Of Spine And Spinal Cord Injury Rehabilitation China Association Of Rehabilitation Of Disabled Persons, Professional Committee Of Spine Chinese Association Of Rehabilitation Medicine, The Second Medical-Rehabilitation Integration Working Committee Chinese Association Of Rehabilitation Medicine, Spine And Spinal Cord Injury Repair Study Group The Third Professional Committee Of Neurorestoratology Chinese Medical Doctor Association.   +3 more
europepmc   +1 more source

[Preparation of a novel polyhydroxy silica stationary phase and application in the separation of alginate oligosaccharides]. [PDF]

Se Pu
Jiao RW, Zhang DD, Hu XY, Zhu WT, Li X, Cai YD, Ren DD, Wang QK, Wu L, Zhou H.   +9 more
europepmc   +1 more source