Results 51 to 60 of about 2,061 (104)

SF₆气体压力对GIS隔离开关操作时暂态电压过程的影响分析

Gaoya dianqi
SF6气体压力直接关系到气体绝缘组合电器（GIS）隔离开关分合过程中触头间的动态绝缘特性。为研究SF6气体压力变化对隔离开关操作时所激发暂态电压过程的影响，文中根据GIS隔离开关开合短母线方式1试验，基于1 100 kV GIS隔离开关搭建试验平台，将隔离开关绝缘气体压力从0.4 MPa分别提升至0.5 MPa和0.54 MPa，利用超宽频电压监测系统准确测量了隔离开关操作时断口两侧的暂态电压，并分析暂态电压时域特征、频谱分布和时频分布特征变化。通过试验数据分析发现当随着SF6气体压力增大 ...
何雨峰, 丁登伟, 卢贵有, 程浪, 邵帅, 刘卫东, 何良   +6 more
doaj  

GIS隔离开关触头间击穿电弧长度对VFTO波形的时域和频域特征影响分析

Gaoya dianqi
GIS中隔离开关在开合短母线时，触头间瞬态击穿将产生VFTO，对设备绝缘构成严重威胁。触头间击穿距离与电弧阻抗特性关联，影响VFTO的时域和频域分布特征。文中为研究GIS隔离开关触头间击穿电弧长度对VFTO波形特征的影响，在GIS隔离开关开合短母线方式1试验中，利用基于电容分压的超宽频电压测量系统准确测量了隔离开关合闸时直流侧全过程VFTO波形，然后提取了前15次预击穿所激发的VFTO波形进行时域、频域以及时频分布分析。通过分析发现，当触头间击穿电弧长度从100 mm减小到30 mm时 ...
廖钧, 丁登伟, 刘卫东, 何雨峰, 易祺, 何大猛, 何良   +6 more
doaj  

[Simulation analysis of adaptability of large airborne negative pressure isolation cabin to aviation conditions]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Guo L, Li F, Jiang L, Du H, Xue B, Yong W, Jiang Y, Zhang M.   +7 more
europepmc   +1 more source

[Clinical efficacy of multidisciplinary team collaboration in the treatment of deep sternal wound infection]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Tong L, Lei CJ, Zhang WF, Han F, Chen Y, Zhang H, Guan H.   +6 more
europepmc   +1 more source

[Progress in microsurgical repair and reconstruction techniques and development of microsurgery in China]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Gu L.
europepmc   +1 more source

[Application of superficial ultrasonography in diagnosing and guiding management of a refractory scalp wound complicated by epidural abscess]. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban
Ling Y, Hu H, Xiang G, Lyu P.
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

基于混合型MMC的柔性直流电网故障电流阻断控制策略

Gaoya dianqi
柔性直流电网是实现大规模可再生能源发电汇集、输送和并网的有效手段。针对基于混合型MMC的直流故障电流阻断方案会引起功率传输中断的问题，本文提出了一种混合型MMC负压控制与超高速机械开关协调配合的故障电流阻断方法，该方法能够快速阻断故障电流并维持非故障线路的功率传输。通过分析故障电流组成及关键影响因素，确定了换流站的控制目标，基于全桥子模块的电压调节自由度，提出了利用混合型MMC输出负压主动吸收故障电流的控制策略，并设计了其与超高速机械开关的协调配合方案，实现故障的可靠隔离。最后 ...
朱博, 徐攀腾, 王晓雪, 辛业春, 江守其   +4 more
doaj  

[Clinical efficacy of two-stage ear reconstruction using autologous rib cartilage in the correction of congenital microtia]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Xu ZC, Zhang Q, Xu F, Li DT, Li YY, Chen X, Zhang RH.   +6 more
europepmc   +1 more source

[Effects of ultrathin inguinal flap free transplantation in repairing hand and foot wounds]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Zhang WD, Zhang W, Gong X, Xu JH, Yang F, Luan XG, Xie WG.   +6 more
europepmc   +1 more source