Results 51 to 60 of about 6,667 (103)

山区35 kV电网单相接地故障类型判断方法

Gaoya dianqi, 2009
为了克服山区35 kV电网消弧线圈的整定与三相电压的对称不能兼顾的矛盾,有必要对单相接地故障类型进行判断。笔者通过对山区35 kV电网建立等值电路图并进行仿真分析,得出电网分别发生永久金属性接地和电弧接地故障时故障相电压的特点和区别,据此提出了一种接地故障类型判断的判据及其实现电路,并讨论了接地电阻及电弧重燃时刻对故障判断的影响。仿真显示,该判据及其实现电路对上述故障类型的判断是相当准确的,且基本不受接地电阻及电弧重燃时刻的影响。该判据及其实现电路的提出,对于降低雷击跳闸率、提高山区35 ...
刘渝根, 谢彦斌
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开关柜典型局部放电类型超声波信号特征量研究

Gaoya dianqi
为识别并区分10 kV开关柜中常见局部放电的故障类型，搭建了开关柜局部放电故障模拟与检测平台，提出了一种基于超声波信号特征量的局部放电识别方法，提取了局部放电时超声波信号的暂态冲击量并利用其概率密度分布进行类型判别，对比研究了4种不同局部放电模型产生超声波信号的暂态冲击量概率密度分布图谱。结果表明：随电压等级的提高，曲线向更高暂态冲击量处偏移，并呈“多波峰状”，同种类型故障产生的曲线高度重合，不同类型故障产生的曲线差异明显，可据此判别10 kV开关柜局部放电类型。
曾潮旭, 徐会凯, 杨淳岚, 杨森, 杨弄潮, 陈天翔   +5 more
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[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

[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

[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 of a machine learning-based ionization efficiency prediction model for per- and polyfluoroalkyl substances and its application in semi-quantitative analysis]. [PDF]

Se Pu
Sun SZ, Li YY, Gao Y, Li KC, Chen Z, Li XQ, Zhang QH.   +6 more
europepmc   +1 more source

[ResLSTM-TemporalSE: an automated classification model for multi-lead ECG signals]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Qu M, Fu R.
europepmc   +1 more source

[State-of-the-art in peripheral nerve injury diagnosis and therapy]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Sun J, Chen L.
europepmc   +1 more source

[Binary encryption comprehensive experiment based on agarose gel electrophoresis]. [PDF]

Se Pu
Duan JW, Ma L, Zhao Q, Wu QQ, Xin BY, Yang JH, Li Y, Wang QZ.   +7 more
europepmc   +1 more source

分布式光伏接入对配电网接地故障影响分析及其故障辨识研究

Dianci bileiqi
大量的分布式光伏接入改变了传统配电网结构和潮流，使配电网接地故障特征发生改变。通过分析光伏并网容量、位置、光伏出力波动性及并网高次谐波对接地故障的零序电压的影响，发现对比光伏接入前，零序电压的各类时频域特征受到了不同程度的影响，甚至出现了部分接地故障时频域特征混淆的问题，造成故障辨识难度加大。对此，本文提出基于零序电压的VMD-MPE-CNN接地故障辨识算法。首先，采用VMD-MPE算法对零序电压信号进行分解，并计算本征模分量的多尺度排列熵得到故障特征矩阵。然后 ...
龙国华, 李琼, 鄢文清, 吴义辉, 邹阳, 刘斌   +5 more
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