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Fractal-based autonomous partial discharge pattern recognition method for MV motors

High Voltage 2018年第2期3卷 103-114页

作者： Zhuo Ma Yang Yang Martin Kearns kevin cowan Huajie Yi Donald M.Hepburn Chengke Zhou School of Engineering and Built Environment Glasgow Caledonian UniversityGlasgowG40BAUK Electrical System Group Engineering DivisionNuclear GenerationEDF EnergyGlasgowG745PGUK

On-line partial discharge(PD)monitoring is being increasingly adopted to improve the asset management and maintenance of medium-voltage(MV)*** study presents a novel method for autonomous analysis and classification of motor PD patterns in situations where a phase-reference voltage waveform is not *** main contributions include a polar PD(PPD)pattern and a fractal theory-based autonomous PD recognition *** pattern that is applied to convert the traditional phase-resolved PD pattern into a circular form addresses the lack of phase information in on-line PD monitoring *** fractal theory is then presented in detail to address the task of discrimination of 6 kinds of single source and 15 kinds of multi-source PD patterns related to motors,as outlined in IEC *** classification of known and unknown defects is calculated by a method known as centre *** of the proposed method is demonstrated using data from laboratory experiments on three typical PD *** study also discusses the application of the proposed techniques with 24 sets of on-site PD measurement data from 4 motors in 2 nuclear power *** results show that the proposed method performs effectively in recognising not only the single-source PD but also multi-source PDs.

关键词： method autonomous fractal

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The trajectory of hybrid and hydrogen technologies in North American heavy haul operations

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Railway Engineering Science 2021年第3期29卷 233-247页

作者： kevin Oldknow Kyle Mulligan Gordon McTaggart-cowan Simon Fraser University SurreyBCCanada Canadian Pacific CalgaryABCanada

The central aim of this paper is to provide an upto-date snapshot of hybrid and hydrogen technology-related developments and activities in the North American heavy haul railway setting,placed in the context of the transportation industry more *** overview of relevant alternative propulsion technologies is provided,including a discussion of applicability to the transportation sector in general and heavy haul freight rail *** is followed by a discussion of current developments and research in alternative and blended fuels,discussed again in both general and specific *** factors and technical considerations for heavy haul applications are reviewed,followed by a discussion of non-technical and human factors that motivate a move toward clean energy in North American Heavy Haul ***,current project activities are described to provide a clear understanding of both the status and trajectory of hybrid and hydrogen technologies in the established context.

关键词： Transportation Propulsion Hydrogen Hybrid Alternative fuels

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Track forecast:Operational capability and new techniques-Summary from the Tenth International Workshop on Tropical Cyclones(IWTC-10)

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Tropical Cyclone Research and Review 2023年第1期12卷 64-80页

作者： Adam Conroy Helen Titley Rabi Rivett Xiangbo Feng John Methven kevin Hodges Alan Brammer Andrew Burton Paromita Chakraborty Guomin Chen Levi cowan Jason Dunion Abhijit Sarkar Bureau of Meteorology West PerthAustralia Met Office ExeterUK National Centre for Atmospheric Science and Department of Meteorology University of ReadingReadingUK Department of Meteorology University of ReadingReadingUK Cooperative Institute for Research in the Atmosphere Colorado State UniversityFort CollinsUSA National Centre for Medium Range Weather Forecasting NoidaIndia Shanghai Typhoon Institute of China Meteorological Administration ShanghaiChina Joint Typhoon Warning Center HonoluluUSA Cooperative Institute for Marine and Atmospheric Studies University of Miamiand Hurricane Research DivisionNOAA/Atlantic Oceanographic and Meteorological LaboratoryMiamiUSA

In this paper,we summarize findings from the Tenth International Workshop on Tropical Cyclones(IWTC-10)subgroup on operational track forecasting techniques and *** rate of improvement in the accuracy of official forecast tracks(OFTs)appears to be slowing down,at least for shorter lead times,where we may be approaching theoretical *** agencies continue to use consensus methods to produce the OFT with most continuing to rely on an unweighted consensus of four to nine NWP *** continues to be limited use of weighted consensus techniques,which is likely a result of the skills and additional maintenance needed to support this *** in the accuracy of ensemble mean tracks is leading to increased use of ensemble means in consensus *** agencies are increasingly producing situation-dependent depictions of track uncertainty,rather than relying on a static depiction of track forecast certainty based on accuracy statistics from the preceding 5 *** trend has been facilitated by the greater availability of ensemble NWP guidance,particularly vortex parameter files,and improved spread in *** improving spread-skill relationships,most ensemble NWP systems remain under *** many operational centers are looking to leverage“super-ensembles”(ensembles of ensembles)to ensure the full spread of location probability is *** is an important area of service development for multi-hazard impact-based warnings as it supports better decision making by emergency managers and the community in the face of uncertainty.©2023 The Shanghai Typhoon Institute of China Meteorological *** services by Elsevier *** behalf of KeAi Communication *** is an open access article under the CC BY-NC-ND license(http://***/licenses/by-nc-nd/4.0/).

关键词： Tropical cyclones Track forecasting Ensembles Track uncertainty

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