Results 41 to 50 of about 62,037 (289)

3D Simulation of Partial Discharge in High Voltage Power Networks [PDF]

, 2019
Open accessPartial discharge (PD) events arise inside power cables due to defects of cable’s insulation material, characterized by a lower electrical breakdown strength than the surrounding dielectric material.
Duffy, A. P., Ragusa, Antonella, Sasse, Hugh G.   +2 more
core  

Influence of Sample Preparation and Processing Procedures on the Thermal Diffusivity of MgO‐C Refractories

Advanced Engineering Materials, EarlyView.
The thermal diffusivity of MgO‐C refractories is highly sensitive to sample preparation and processing procedures. In this article, the effects of coking sequence, machining conditions, structural inhomogeneity, and graphite coating application on measurements using laser flash apparatus are systematically investigated.
Luyao Pan, Rhena Wulf, Till M. J. Stadtmüller, Christos G. Aneziris, Tobias M. Fieback   +4 more
wiley   +1 more source

Intelligent identification method of insulation pull rod defects based on intactness‐aware Mosaic data augmentation and fusion of YOLOv5s

High Voltage
The authors introduce the intactness‐aware Mosaic data augmentation strategy, designed to tackle challenges such as low accuracy in detecting defects in insulation pull rods, limited timeliness in intelligent analysis, and the absence of a comprehensive ...
Changyun Li, Yuze Hua, Yilin Liu, Kai Liu, Sanyi Zhang   +4 more
doaj   +1 more source

Ultrasonic characteristics of compound interface defects of high voltage cable accessory and its correlation with insulation properties

Polymer Testing
Insulation defects in high-voltage cable accessories easily induce partial discharge and even severe faults under sustained electrical stress, threatening cable line safe operation directly.
Yanhui Wei, Zeyu Wang, Renyou Li, Meng Wang, Defeng Zang, Guochang Li   +5 more
doaj   +1 more source

Insulator Defect Detection Based on ML-YOLOv5 Algorithm

Sensors, 2023
To address the challenges of balancing accuracy and speed, as well as the parameters and FLOPs in current insulator defect detection, we propose an enhanced insulator defect detection algorithm, ML-YOLOv5, based on the YOLOv5 network. The backbone module incorporates depthwise separable convolution, and the feature fusion C3 module is replaced with the
Tong Wang, Yidi Zhai, Yuhang Li, Weihua Wang, Guoyong Ye, Shaobo Jin   +5 more
openaire   +3 more sources

Imaging time series for the classification of EMI discharge sources [PDF]

, 2018
In this work, we aim to classify a wider range of Electromagnetic Interference (EMI) discharge sources collected from new power plant sites across multiple assets. This engenders a more complex and challenging classification task.
Boreham, Philip, Hughes-Narborough, Michael, Mitiche, Imene, Morison, Gordon, Nesbitt, Alan, Stewart, Brian G.   +5 more
core   +2 more sources

Piezoresistive Monitoring of Carbon Nanomaterial‐Reinforced Epoxy Composites Under Cyclic and Fatigue Loading: A Review

Advanced Engineering Materials, EarlyView.
Carbon nanomaterial‐reinforced epoxy composites exhibit pronounced piezoresistive behavior, enabling intrinsic damage sensing under cyclic and fatigue loading. This review critically compares carbon nanotube and graphene systems, correlating filler content, percolation threshold, and gauge factor with sensing stability and damage evolution.
J. M. Parente, J. Nunes‐Pereira, A. P. Silva, P. N. B. Reis   +3 more
wiley   +1 more source

Photon counting technique as a potential tool in micro‐defect detection of epoxy insulation pull rod in gas‐insulated switchgears

High Voltage
The micro‐defects in epoxy‐based insulation materials generate a local high electric field which results in continuous degradation, seriously endangering the insulation system of gas‐insulated switchgears.
Xianhao Fan, Shu Niu, Hanhua Luo, Jizhong Liang, Fang Liu, Wenqiang Li, Weidong Liu, Wensheng Gao, Yulong Huang, Chuanyang Li, Jinliang He   +10 more
doaj   +1 more source

IDENTIFICATION OF TECHNOLOGICAL DEFECTS IN HIGH-VOLTAGE SOLID INSULATION OF ELECTRICAL INSULATION STRUCTURES ON THE CHARACTERISTICS OF PARTIAL DISCHARGES

Electrical engineering & Electromechanics, 2019
Introduction. High-voltage insulation systems always have some background level of the partial discharges, which does not have any significant effect on the life of the electrical insulation design.
G. V. Bezprozvannych, A. G. Kyessayev, I. A. Mirchuk, A. V. Roginskiy   +3 more
doaj   +1 more source

Defect mediated manipulation of nanoclusters on an insulator [PDF]

Scientific Reports, 2013
With modern scanning probe microscopes, it is possible to manipulate surface structures even at the atomic level. However, manipulation of nanoscale objects such as clusters is often more relevant and also more challenging due to the complicated interactions between the surface, cluster and apparatus.
Cabailh, Gregory, Foster, Adam S., Barth, Clemens, Hynninen, Teemu   +4 more
openaire   +5 more sources