1998 IEEE Industrial and Commercial Power Systems Technical Conference. Conference Record. Papers Presented at the 1998 Annual Meeting (Cat. No.98CH36202)最新文献
Pub Date : 1998-05-03DOI: 10.1109/ICPS.1998.692561
P. Sutherland
When calculating available fault currents for DC systems with static converters as sources, the internal resistance of the source must be adjusted based upon the terminal voltage of the source. If the system has a single source, an iterative technique is normally used. However, this becomes cumbersome when solving systems with multiple sources and multiple fault locations. Previous methods have adjusted the resistance of all static sources by a fixed percentage. Methods for providing multiplying factors to adjust the fault contributions of static sources which differentiates between local and remote sources are discussed. Individual multiplying factors for each source may be calculated by means of a formula, or an approximate multiplying factor for all sources may be found by iteration. The multiplying factors are then applied to the results of a single step matrix solution for the short-circuit currents. This facilitates the use of computer spreadsheet programs for the solution of the problem. It is concluded that the use of a fixed multiplying factor may offer the most conservative solution method.
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Pub Date : 1998-05-03DOI: 10.1109/ICPS.1998.692552
S. D. Dunn, F. Wells
In generator installations where you have more than one 3-pole automatic-transfer-switch (ATS) on a 4-wire system, stray neutral currents and unwanted magnetic fields may arise. These stray currents and fields can cause a multitude of problems. Magnetic fields created by stray neutral currents can cause objectionable current on the conduit system. Objectionable current of this type can cause voltage rises on the grounding system. Geometries of stray neutral current paths can cause magnetic fields through areas of buildings that may cause problems with sensitive electronic equipment. Ground fault protection devices may detect incorrect ground fault condition. The presence of stray ground currents in multi-ATS installations is dependent on equipment selection and bonding connection points, whereas the magnitude of these currents depend on the system geometry, raceway size/types, and other factors. This paper looks at several stray neutral configurations tested in the Vanderbilt Power Laboratory.
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Pub Date : 1998-05-03DOI: 10.1109/ICPS.1998.692549
W. H. Jones, M. Stansbury
This article discusses a power quality monitoring program underway between a semiconductor manufacturing facility and its serving utility, A description of the sophisticated monitoring program installed and maintained by the utility and a portion of the power quality monitoring installed within the manufacturing site distribution system is included. An incident, where monitoring pinpointed a utility substation transformer load tap changer problem, is presented in depth. The subsequent investigation and actions that took place to repair the tap changer without impacting the manufacturing facility are discussed. A fault in the tap changer compartment could have resulted if the tap changer problem had gone undetected. Steps taken to correct the tap changer problem averted a possible fault and subsequent transformer differential relay action.
{"title":"Power quality monitoring enhances preventive maintenance program: detecting a substation transformer tap changer problem","authors":"W. H. Jones, M. Stansbury","doi":"10.1109/ICPS.1998.692549","DOIUrl":"https://doi.org/10.1109/ICPS.1998.692549","url":null,"abstract":"This article discusses a power quality monitoring program underway between a semiconductor manufacturing facility and its serving utility, A description of the sophisticated monitoring program installed and maintained by the utility and a portion of the power quality monitoring installed within the manufacturing site distribution system is included. An incident, where monitoring pinpointed a utility substation transformer load tap changer problem, is presented in depth. The subsequent investigation and actions that took place to repair the tap changer without impacting the manufacturing facility are discussed. A fault in the tap changer compartment could have resulted if the tap changer problem had gone undetected. Steps taken to correct the tap changer problem averted a possible fault and subsequent transformer differential relay action.","PeriodicalId":436140,"journal":{"name":"1998 IEEE Industrial and Commercial Power Systems Technical Conference. Conference Record. Papers Presented at the 1998 Annual Meeting (Cat. No.98CH36202)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130614665","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}
Pub Date : 1998-05-03DOI: 10.1109/ICPS.1998.692525
A. Chowdhury, D. Koval
In a competitive energy market in which power supply reliability can influence customer purchasing decisions, electric utilities throughout the world are rapidly recognizing that they cannot ignore customer preferences. Today's energy market is characterized by intense price competition and electric utilities are faced with new challenges of large debts, budget constraints, safety, environment and economic issues, lower load growth than in the past, need for more involvement of public at large in the planning and design process, and more competitive nonconventional suppliers of electricity. In addition, in a deregulated competitive energy market, electric utilities are under conflicting pressures of providing even higher standards of service reliability and hold the line on rates. Value-based system facility planning offers a rational response to these conflicting customer demands. This paper presents two case studies to illustrate the basic concepts and applications of value-based power system planning. The paper also presents a methodology for determining the unique composite customer cost of interruptions (i.e., damage functions) for changing area system network configurations.
{"title":"Value-based power system reliability planning","authors":"A. Chowdhury, D. Koval","doi":"10.1109/ICPS.1998.692525","DOIUrl":"https://doi.org/10.1109/ICPS.1998.692525","url":null,"abstract":"In a competitive energy market in which power supply reliability can influence customer purchasing decisions, electric utilities throughout the world are rapidly recognizing that they cannot ignore customer preferences. Today's energy market is characterized by intense price competition and electric utilities are faced with new challenges of large debts, budget constraints, safety, environment and economic issues, lower load growth than in the past, need for more involvement of public at large in the planning and design process, and more competitive nonconventional suppliers of electricity. In addition, in a deregulated competitive energy market, electric utilities are under conflicting pressures of providing even higher standards of service reliability and hold the line on rates. Value-based system facility planning offers a rational response to these conflicting customer demands. This paper presents two case studies to illustrate the basic concepts and applications of value-based power system planning. The paper also presents a methodology for determining the unique composite customer cost of interruptions (i.e., damage functions) for changing area system network configurations.","PeriodicalId":436140,"journal":{"name":"1998 IEEE Industrial and Commercial Power Systems Technical Conference. Conference Record. Papers Presented at the 1998 Annual Meeting (Cat. No.98CH36202)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126815636","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}
1998 IEEE Industrial and Commercial Power Systems Technical Conference. Conference Record. Papers Presented at the 1998 Annual Meeting (Cat. No.98CH36202)
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