Results 51 to 60 of about 1,070 (115)

考虑先导电流的架空输电线路雷电反击研究

Dianci bileiqi
先导发展法作为架空输电线路耐雷水平计算中绝缘子串闪络的判据之一，在国内外已经获得广泛应用。在先导通道的建立过程中，会有大量电荷在先导通道中积聚，可以等效为流过放电通道的先导电流，一般认为该先导电流和先导发展速度成正比。但目前基于先导发展法的绝缘子串闪络计算中通常忽略了先导电流。基于CIGRE推荐公式计算先导发展速度和先导电流，在EMTP/ATP中采用可控时变电阻、TACS可控开关、MODEL模块建立了考虑先导电流的绝缘子串闪络模型，开展了500 kV和110 kV架空输电线路反击耐雷水平和500 ...
司俊杰, 陈小月, 文习山, 邓冶强, 王达, 王羽   +5 more
doaj  

黑龙江地区10kV配电线路防雷研究

Dianci bileiqi, 2017
以黑龙江地区典型配电线路为研究对象,采用ATP-EMTP对配电线路杆塔进行仿真分析,发现杆塔耐雷水平随接地电阻的升高而降低;提高线路绝缘水平对于线路防雷性能有直接而且明显的提升;避雷器对于裸导线和绝缘导线的耐雷水平提升均在90%以上;最后,以雷击跳闸次数为指标,对典型配电线路进行了雷害风险评估,并依据评估结果,制定了针对性的防雷方案:对雷害风险在C级的13基杆塔,加装避雷器;对雷害风险在B级的34基杆塔,更换接地模块来改善接地电阻;对于雷害风险在A级的其余杆塔,在日常巡视中多加注意。
孙巍, 李童, 刘洋, 刘进, 吴军, 卢泽军   +5 more
doaj  

[Distribution of pathogenic bacteria in ear canal secretions of patients with chronic suppurative otitis media, changes in levels of IL-8 and TLR4 in ear canal secretions, and their clinical significance]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Cheng X, Yang L, Liu J.
europepmc   +1 more source

[SERPINE1 overexpression promotes proliferation and paclitaxel resistance of triple-negative breast cancer cells by inducing M2 macrophage polarization]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Zhang Q, Liu B, Lei L, Wang Y, Zhang X, Mao Z, Tang P, Zhang J, Yang J, Peng Y, Liu Z.   +10 more
europepmc   +1 more source

提高输电线路耐雷水平的关键因素影响分析

Dianci bileiqi
输电线路是电力系统的重要组成部分，承载着由偏远能源基地向负荷中心输送电能的重任。输电线路的送电距离可达200 km以上，沿途地势地形、气候环境复杂多变，极易遭到雷击。如何提高输电线路的耐雷水平，降低雷击跳闸率是目前亟待解决的问题。本研究以330 kV同塔双回输电线路为例，分析了冲击接地电阻、耦合地线和避雷器配置方式等关键因素对输电线路耐雷水平的影响。研究结果有助于指导防雷方案设计，对提高输电线路的耐雷水平具有一定的参考价值。
张军强, 王选社, 盛飞, 高若楠, 于淑婷, 刘法亮, 贺博, 张浩   +7 more
doaj  

[Advances in Diagnosis and Targeted Therapy of KRASG12C Mutant 
Non-small Cell Lung Cancer]. [PDF]

Zhongguo Fei Ai Za Zhi
Shi J, Wang Y, Zheng J, Zhou J.
europepmc   +1 more source

[Characteristics of bronchoalveolar lavage fluid microbial distribution at different disease stages and its relationship with immune function in children with refractory <i>Mycoplasma pneumoniae</i> pneumonia]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Yao C, Zhang X, Xu R.
europepmc   +1 more source

[Bacterial Infection Spectrum and Antimicrobial Resistance in 2850 Cases of Community-Acquired Pneumonia in Children]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Zhong M, Xie J, Wang H, Fan J, Li M, Zou F, Li L.   +6 more
europepmc   +1 more source

[Diagnostic value of intestinal tissue metagenomic next-generation sequencing in severe diarrhea following haploidentical hematopoietic stem cell transplantation]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Lin QX, Wei JJ, Lian TT, Lin BQ, Ren JH, Zheng XY, Wu XQ, Li J, Chen H, Xie SJ, Yang T.   +10 more
europepmc   +1 more source

[Guideline for the diagnosis and treatment of chronic myeloid leukemia in China (2025)]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Chinese Society of Hematology, Chinese Medical Association.   +1 more
europepmc   +1 more source