2007 Electrical Insulation Conference and Electrical Manufacturing Expo最新文献

{"title":"Partial discharges at sub-atmospheric pressures — insulation evaluation procedures for aerospace applications","authors":"D. Kasten, S. Sebo, X. Liu","doi":"10.1109/EEIC.2007.4562619","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562619","url":null,"abstract":"Partial discharge (PD) testing in a low pressure environment is a diagnostic method for evaluating the integrity of electrical insulation in aircraft and spacecraft capable of operating at high altitudes. This evaluation is essential in order to ensure the reliable performance and proper functioning of power system components of aerospace equipment under operating conditions. The paper outlines an experimental PD investigation program covering various electrode systems, using air, argon and helium, at pressures in the range of 101.3 kPa (760 Torr) to 0.27 kPa (2 Torr) with 60 Hz ac energization. This pressure range corresponds to a range of flight altitudes from sea level to about 60 km. At low pressures (high altitudes) PD pulse characteristics are different compared to the values typically encountered at terrestrial pressures. In most instances, these sub-atmospheric characteristics imply a need for changes of commonly used test procedures. The paper suggests modifications and/or additions to common test procedures while observing the basic principles of the IEC 60270 standard.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133593364","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}

{"title":"Optimization of maintenance strategy for marine generators","authors":"Jinlu Sheng, Zhu Lui, Fanhui Xing, Dongmei Zhang","doi":"10.1109/EEIC.2007.4562591","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562591","url":null,"abstract":"The maintenance strategy for marine generators is a key factor that affects ship safety and economic benefits. In this paper, on the basis of marine maintenance system theories, by analyzing maintenance after a failure event, preventive maintenance, and condition based maintenance, and so on, a ship maintenance strategy and the corresponding processes are constructed. A risk assessment is made using calculated degree of reliability. According to a marine economic mathematical model, the risk to reliability and economics, a maintenance period can be determined effectively.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131881353","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}

{"title":"Investigation and diagnosis of a 184-MVA air-cooled generator heavily affected by slot partial discharge activity","authors":"M. Bélec, S. Li, D. Nguyen, L. Lépine, C. Guddemi, D. Lessard-Déziel, T. Schwartz, L. Lamarre","doi":"10.1109/EEIC.2007.4562594","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562594","url":null,"abstract":"For many years, partial discharge (PD) activity has been used in air-cooled generators as one of the important indicators of degradation mechanisms in stator winding insulation. Up to a certain level, these degradation processes are slow. Under normal operation, PD measurement and trending can generally indicate that not only electrical but also mechanical, thermal or ambient (contamination) degradation processes are occurring. Partial discharge activity in air-cooled generators also produces ozone so that the presence of ozone inside and around the generator enclosure is indicative of PD activity. In some cases, the ozone concentration produced by sustained PD activity can reach such levels that it becomes a health hazard for plant personnel. Hazardous levels were recorded in 1991, after 12 years of operation, inside the enclosure of the four 184-MVA hydro generators at BC hydro's peace canyon (PCN) generating station, revealing a situation that was probably active for some years. Results from annual PD measurement performed using PDA (partial discharge analysis) techniques showed an asymmetry in favor of positive discharges that can be the result of slot discharges. Phase resolved partial discharge (PRPD) measurements combined with ozone measurements taken all around the rear perimeter of the generator core were used to confirm the nature of the PDs. Since one of the generators was scheduled for a complete stator winding and core replacement in 2006, an exhaustive investigation was performed before and after replacing the stator. Some stator bars were removed from the slots for visual inspection and extensive laboratory testing. This paper presents results of the on-line PD and ozone measurements, together with findings from visual inspection and laboratory investigations of the retrieved bars. These results were analyzed collectively in order to establish the root cause of the insulation problem as well as the deterioration mechanism of the generator stator winding. Finally, a new pre-installation testing procedure is recommended to prevent such a costly insulation problem from occurring again.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132967749","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}

{"title":"Generator condition monitor evolution and capability","authors":"C. Maughan, P. E. Emeritus","doi":"10.1109/EEIC.2007.4562587","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562587","url":null,"abstract":"The generator condition monitor (also called \"core monitor\") had an early history of invalid alarms due to causes not related to generator overheating. Because responding to a monitor alarm involved high cost to the owner, it became common industry practice to ignore the device. Yet even on the early, somewhat primitive instruments, valid alarms occurred. Because of the potentially high value of early detection of burning inside a generator, a large effort has been expended to improve reliability of the device and make it easier to use. These efforts involved both present suppliers of this equipment, general electric & environment one, as well as others. Around 1989 a mature design had been reached, and since then over 500 of the modern devices have been put in service. Based on recent EPRI surveys and other data sources, the post-1989 monitors are now performing well, with infrequent invalid alarms. Seventeen valid alarms have been reported on generators, and these incidents are summarized individually in this paper. Although the number of valid alarms is small, because of the inherently high destructive nature of these failures the potential saving has been great . A single failure can exceed $10 million in repair cost alone, and forced outage time costs can far exceed the high repair costs. Correct response to the infrequent monitor alarm has been enhanced by the availability of the distributed control system. If properly maintained and operated, the generator condition monitor can be a valuable device that could mean the difference between a brief shut down for minor repairs or a major overhaul involving weeks or even months of costly downtime.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133465974","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}

{"title":"The application of wireless sensor networks for condition monitoring in three-phase induction motors","authors":"Xin Xue, V. Sundararajan, W. Brithinee","doi":"10.1109/EEIC.2007.4562657","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562657","url":null,"abstract":"The most commonly used technique for the detection of faults in large three-phase induction motors is to measure the supply current fed into the motor and analyze the signal spectrum. This technique is well established and has been shown to be indicative of a faulty condition. However, current signature analysis is usually used by very skilled technicians using expensive equipment. A cost effective condition monitoring technique is needed for smaller motors (those smaller than 200 HP). This paper explores the possibilities of using wireless sensors inside the motor. Wireless sensors are gaining popularity in condition monitoring applications because of their relatively low cost and ease of installation. This paper proposes a system of condition monitoring of the three-phase induction motor using wireless sensor networks (WSN) to measure the temperature and the vibration signals. The sensor nodes are placed on the rotor and the stator. The data acquisition is accomplished at a base station located at a distance of 6 feet. Issues related to electromagnetic interference between the wireless devices and the magnetic fields present within the motor are investigated.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125614327","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}

{"title":"Using a six fault zone approach for predictive maintenance on motors","authors":"D. McKinnon","doi":"10.1109/EEIC.2007.4562630","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562630","url":null,"abstract":"A comprehensive analysis of motor health may be accomplished by combining online and offline test results into fault zones. These fault zones are Power Quality, Power Circuit, Stator, Insulation, Rotor, and Air Gap. Power Quality focuses on the quality of the voltage and current. Power Circuit focuses on the power circuit supplying power to the motor. The Stator Fault Zone focuses on the turn-to- turn insulation and internal coil connections. The Insulation Fault Zone refers to the winding to ground insulation. The Rotor Fault Zone refers to the health of the rotor cage and laminations. The Air Gap Fault Zone refers to the quality of the air gap between the rotor and the stator. Each fault zone should be analyzed to accurately assess the overall health of a motor. This paper will provide a brief introduction to a six fault zone approach for predictive maintenance on motors.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"61 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122509769","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}

{"title":"Reviewing current transformers and current transducers","authors":"C. Mclyman","doi":"10.1109/EEIC.2007.4562643","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562643","url":null,"abstract":"The purpose of this paper is to provide a tutorial review of three types of current transducers that are used in instruments and power. The three current transducers that will be discussed are; (1) the ac current transducer; (2) the dc current saturable reactor; and (3) the Hall effect generator with the rugged solid iron core.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127230014","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}

{"title":"The challenges of using variable-speed motor drives in appliance applications","authors":"E. Persson","doi":"10.1109/EEIC.2007.4562659","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562659","url":null,"abstract":"Consumer applications, and in particular appliances such as washers, dryers, and air conditioners, have long been users of conventional AC Induction Motors (ACIM) for operating pumps, compressors, blowers and agitators as common examples. To meet the increasing demand of energy- savings initiatives, the ACIM is rapidly being replaced with Brushless DC motors (BLDC) and Permanent Magnet Synchronous Motors (PMSM). This article presents the reasons why permanent- magnet motors (and their necessary drive and control electronics) are used, and the tradeoffs and challenges in doing so in a cost-effective manner.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127340962","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}

{"title":"Maritime structures and ships lightning protection","authors":"A. Hossam-eldin, E.A.M. Omran","doi":"10.1109/EEIC.2007.4562582","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562582","url":null,"abstract":"This paper investigates and demonstrates a developed technique to use the collection volume method (CVM) for the placement of either conventional or non-conventional lightning protection systems (LPS) for ships. Each lightning eliminator assigned a striking distance, which is calculated as a function of ship height, radius of curvature, ship location, ship dimensions, risk factor, and lightning related parameters. This novel technique was applied to a medium war ship, Cargo, destroyer, as well as an air craft carrier, and showed to be a very efficient mean for lightning protection for these ships. For some design cases, a hybrid system was chosen to be the most efficient and the less expensive system.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125361244","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}

{"title":"Breakdown characteristics of nitrogen in partial vacuum under pulsed electric fields of kHz range","authors":"K. Koppisetty, H. Kirkici, D. Schweickart","doi":"10.1109/EEIC.2007.4562612","DOIUrl":"https://doi.org/10.1109/EEIC.2007.4562612","url":null,"abstract":"This work presents the breakdown characteristics of nitrogen in partial vacuum conditions under pulsed electric fields at 50 kHz to 200 kHz. Results of breakdown events are discussed and compared with the results of helium breakdown under similar conditions.","PeriodicalId":152045,"journal":{"name":"2007 Electrical Insulation Conference and Electrical Manufacturing Expo","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125443584","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}