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1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)最新文献

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Parallel intelligent search for loss minimization in distribution systems 配电系统损耗最小化的并行智能搜索
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755345
W. Tao, C. Cavellucci, C. Lyra
{"title":"Parallel intelligent search for loss minimization in distribution systems","authors":"W. Tao, C. Cavellucci, C. Lyra","doi":"10.1109/TDC.1999.755345","DOIUrl":"https://doi.org/10.1109/TDC.1999.755345","url":null,"abstract":"The problem of obtaining a network configuration of minimum energy losses for electric power distribution systems is addressed. It can be regarded as a generalization of the minimum spanning tree problem, where edge costs vary as the configuration changes. A solution is found with a recursive two-step procedure: the constraint of radial operation is relaxed in the first step, leading to an optimistic solution (a lower bound); information from this approximate solution is used in the second step to approach a feasible optimal solution. Nonlinear network flow optimization techniques team with search strategies from the field of artificial intelligence to cope with computation intractability. Parallel processing speeds the search of optimal solutions. A case study sheds light on the possibilities and limitations of the procedure.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125471566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A study of tension and jamming when pulling cable around bends 拉电缆绕弯道时的张力和堵塞的研究
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755324
J.M. Fee, M. J. Fee
{"title":"A study of tension and jamming when pulling cable around bends","authors":"J.M. Fee, M. J. Fee","doi":"10.1109/TDC.1999.755324","DOIUrl":"https://doi.org/10.1109/TDC.1999.755324","url":null,"abstract":"Existing theory and research on the pulling (and jamming) of three power cables through bends are reviewed. Pulling tension through bends is measured for three cable pulls with jam ratios from 2.4 to 4.3. These three cable pulls are compared to single cable pulls. Cable feed position and lubrication in three cable pulls are also analyzed.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130325954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Reduction of active losses with reconfiguration of electricity distribution networks 配电网重构降低有功损耗
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755332
M. Horvat, J. Voršič, A. Orgulan, G. Skerbinek
{"title":"Reduction of active losses with reconfiguration of electricity distribution networks","authors":"M. Horvat, J. Voršič, A. Orgulan, G. Skerbinek","doi":"10.1109/TDC.1999.755332","DOIUrl":"https://doi.org/10.1109/TDC.1999.755332","url":null,"abstract":"Electricity distribution networks in densely populated urban areas are, in order to increase the reliability of supply, usually designed as meshed networks, though they always operate in radial configuration. Reconfiguration of distribution networks is achieved through switching operations on switching devices of distribution network branches (switching on/off of a branch). It is often the case that the existing configuration is not the configuration with minimum power losses. With the new computer program, developed by the authors, it is possible to find the network configuration that enables operation with minimum losses. The program proposes the best network configuration to the dispatcher, and the latter makes his own decision whether to change the network configuration or not. The mathematical algorithm for the network reconfiguration is presented in the paper, as well as results of the reconfiguration of the electricity distribution network of the city of Maribor, Slovenia.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132201768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Voltage surge resonance on electric power network 电网电压浪涌谐振
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756134
K. Nasrullah
{"title":"Voltage surge resonance on electric power network","authors":"K. Nasrullah","doi":"10.1109/TDC.1999.756134","DOIUrl":"https://doi.org/10.1109/TDC.1999.756134","url":null,"abstract":"Voltage surge resonance on a transmission network during repetitive lightning strokes or multiple switching operations is presented. The incident surges setup standing waves on the line/cable section bounded by high reflection terminal components such as open line or transformers. Under appropriate boundary conditions the oscillating voltage surges are likely to amplify during back and forth reflections. The gain conditions become satisfied if the arrival of subsequent strokes on the point of incidence is synchronized to the arrival of reflected surges after a few round trips. A synchronous surge amplification model based on general theory of microwave resonators is attempted to explain accelerated voltage amplification on the transmission network.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131502858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
An effective algorithm for distribution feeder loss reduction by switching operations 一种有效的配电馈线切换降损算法
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756119
Whei-Min Lin, H. Chin, Gyne-Jong Yu
{"title":"An effective algorithm for distribution feeder loss reduction by switching operations","authors":"Whei-Min Lin, H. Chin, Gyne-Jong Yu","doi":"10.1109/TDC.1999.756119","DOIUrl":"https://doi.org/10.1109/TDC.1999.756119","url":null,"abstract":"This paper presents an effective heuristic-based switching scheme to solve the distribution feeder loss reduction problem in fuzzy notations. By using the proposed algorithm, an efficient network configuration can be obtained to reduce loss. According to the switch searching strategies, some membership functions were defined in this paper. Through the \"set\" operations of all the membership functions, the on-off switch status can be determined. By considering the largest membership value obtained in each searching level, the process can be confined to a limited number of feasible states. Tests to many practical networks show that the desired switching operations can be reached in a very efficient manner by using this algorithm.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129497543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Integrated Modelling Environment: a platform for dynamic protection modelling and advanced functionality 集成建模环境:一个动态保护建模和高级功能的平台
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755386
A. Dyśko, J. McDonald, G. Burt, J. Goody, B. Gwyn
{"title":"Integrated Modelling Environment: a platform for dynamic protection modelling and advanced functionality","authors":"A. Dyśko, J. McDonald, G. Burt, J. Goody, B. Gwyn","doi":"10.1109/TDC.1999.755386","DOIUrl":"https://doi.org/10.1109/TDC.1999.755386","url":null,"abstract":"This paper summarises work undertaken in collaboration with The National Grid Company (NGC) to investigate the performance of dynamic models of the protection system. Models of commercially available relays have been developed, based on the manufacturers' specifications and algorithms. The concept of an Integrated Modelling Environment (IME) with an open architecture which can utilise (as input) primary power system simulation results obtained from the standard EMTP program, as well as actual fault records from the network, is presented. Case studies are presented to illustrate the capabilities of the IME, specifically involving the study of distance and unit protection scheme performance. Among other benefits, the paper also indicates the possible use of the IME as a Protection System Design Validation Tool. The outcome of this work has been validated by protection engineers and contributes to the improvement of the reliability and security of the protection system.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131125049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Radially and longitudinally water block cable utilizing a corrugated, longitudinally folded and sealed copper tape 径向和纵向防水电缆采用波纹，纵向折叠和密封的铜带
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755315
P. Cinquemani, F. Kuchta
{"title":"Radially and longitudinally water block cable utilizing a corrugated, longitudinally folded and sealed copper tape","authors":"P. Cinquemani, F. Kuchta","doi":"10.1109/TDC.1999.755315","DOIUrl":"https://doi.org/10.1109/TDC.1999.755315","url":null,"abstract":"It is well known that the life of an extruded dielectric cable can deteriorate more rapidly under AC voltage stress when moisture is present in the insulation. There are many mechanisms that may subject the insulation system of a cable to moisture during the cable's life. This paper reviews a novel design that is radially and longitudinally water blocked a new test method for radial water tightness and the most typical test results. The basic design concept includes a filled conductor, extruded polymeric insulation system, longitudinal moisture barrier, a combination metallic shield/radial moisture barrier and an overall jacket.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116447478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal model of a disk coil with directed oil flow 定向油流盘式线圈的热模型
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756171
R. M. Del Vecchio, P. Feghali
{"title":"Thermal model of a disk coil with directed oil flow","authors":"R. M. Del Vecchio, P. Feghali","doi":"10.1109/TDC.1999.756171","DOIUrl":"https://doi.org/10.1109/TDC.1999.756171","url":null,"abstract":"A model of a transformer disk coil with directed oil flow is presented which utilizes a network of oil flow paths. Along each path segment, oil velocities and temperature rises are computed. The oil flow is assumed to be thermally driven. The model includes temperature dependent oil viscosity, resistivity, oil density, and temperature and velocity dependent heat transfer and friction coefficients. Because of the nonlinearities, an iterative solution is necessary. Temperature and oil velocity profiles are computed. From this, the average winding rise and the hot spot temperature can be determined. The model can also be used for optimal positioning of the oil flow washers.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123357388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
A new ARIMA model for hourly load forecasting 一种新的ARIMA小时负荷预测模型
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.755371
G. Juberias, R. Yunta, J. Garcia Moreno, C. Mendívil
{"title":"A new ARIMA model for hourly load forecasting","authors":"G. Juberias, R. Yunta, J. Garcia Moreno, C. Mendívil","doi":"10.1109/TDC.1999.755371","DOIUrl":"https://doi.org/10.1109/TDC.1999.755371","url":null,"abstract":"In this work, a short term load forecasting model and its application in real time are described. It is being used successfully in the Central Region Control Center in Red Electrica de Espana. The model is based on a time series analysis methodology and includes the action of meteorology as an explanatory variable. Information about the influence of meteorology on hourly electrical load is given to the model as an explanatory variable by using the daily electrical load forecast. This is chosen as the explanatory variable because it can be considered as the most efficient and simple way to estimate the influence of meteorology in every hour of the day. The use of the model in a real time control system is also explained in this work.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125203470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 81
Accurate hot spot modeling in a power transformer leading to improved design and performance 在电力变压器中精确的热点建模导致改进的设计和性能
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333) Pub Date : 1999-04-11 DOI: 10.1109/TDC.1999.756172
J. Declercq, W. Van der Veken
{"title":"Accurate hot spot modeling in a power transformer leading to improved design and performance","authors":"J. Declercq, W. Van der Veken","doi":"10.1109/TDC.1999.756172","DOIUrl":"https://doi.org/10.1109/TDC.1999.756172","url":null,"abstract":"Power transformers are key components in the distribution of electrical energy, so it is very important to protect them from a breakdown. Hot spot temperature is an important parameter in aging of a transformer so it's both for customers and producers of transformers very useful to have an accurate measurement or computer model prediction of the hot spot temperature. This paper describes a computer model, which can predict hot-spot temperatures for different types of cooling regimes and transformer winding geometries. The program can be used as a design tool, to verify if the hot spot temperature is not too high and to verify the influence of different parameters (winding geometry as well as cooling method or number of radiators) on the temperatures. This knowledge can be shared with the customers allowing improved loading conditions.","PeriodicalId":137272,"journal":{"name":"1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128835183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 45
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