Pub Date : 1900-01-01DOI: 10.1109/papcon.2004.1338379
C. Mozina, M. Young, B. Bailey, B. Baker, G. Dalke, B. Duncan, J. Fischer, D. Love, N. Nichols, C. Normand, L. Padden, A. Pierce, P. Pillai, L. Powell, T. Stringer
Protective relay technology over the past twenty-five years has evolved from single-function electromechanical (E-M) relays to static (electronic) relays and finally to digital multifunction relays. A significant number of these multifunction digital relays are being installed on medium voltage electric power systems within industrial and commercial facilities. As was required in earlier E-M and static relay technologies, digital relays also require commissioning and relay setting verification. This paper discusses the unique challenges the user faces in testing and commissioning digital multifunction relays. It also explores the impact on maintenance testing of self-diagnostics, the digital relay's internal capability to check itself for failures.
{"title":"Commissioning and maintenance testing of multifunction digital relays","authors":"C. Mozina, M. Young, B. Bailey, B. Baker, G. Dalke, B. Duncan, J. Fischer, D. Love, N. Nichols, C. Normand, L. Padden, A. Pierce, P. Pillai, L. Powell, T. Stringer","doi":"10.1109/papcon.2004.1338379","DOIUrl":"https://doi.org/10.1109/papcon.2004.1338379","url":null,"abstract":"Protective relay technology over the past twenty-five years has evolved from single-function electromechanical (E-M) relays to static (electronic) relays and finally to digital multifunction relays. A significant number of these multifunction digital relays are being installed on medium voltage electric power systems within industrial and commercial facilities. As was required in earlier E-M and static relay technologies, digital relays also require commissioning and relay setting verification. This paper discusses the unique challenges the user faces in testing and commissioning digital multifunction relays. It also explores the impact on maintenance testing of self-diagnostics, the digital relay's internal capability to check itself for failures.","PeriodicalId":189773,"journal":{"name":"Conference Record of 2004 Annual Pulp and Paper Industry Technical Conference (IEEE Cat. No.04CH37523)","volume":"545 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134180070","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 : 1900-01-01DOI: 10.1109/PAPCON.2004.1338359
M. Bilkey, B. Judson
It was in the late '60s that Mead Paper decided to add the No.3 paper machine and off machine coater (OMC) to its mill in Escanaba. The Beloit Corporation designed and built the machines using a lineshaft with a differential mechanical drive system and analog DC helper drives. The paper machine's lineshaft is driven with a classic steam turbine. The off machine coater's lineshaft prime mover is two "in-line" DC motors and respective drives. The drive systems have been up-graded several times over the years, but this paper is about the February 2002, OMC mechanical rebuild that replaced the positive infinitely variable (PIV) units on each of the machines five lineshaft differentials. The result of replacing the weakest link (the PIV) of the mechanical drive with a small horsepower AC motor/drive has increased the speed and control capability of the off machine coater, much to the delight of operators.
{"title":"Replacement of mechanical PIVs by AC drives off machine coater rebuild -lineshaft to sectional","authors":"M. Bilkey, B. Judson","doi":"10.1109/PAPCON.2004.1338359","DOIUrl":"https://doi.org/10.1109/PAPCON.2004.1338359","url":null,"abstract":"It was in the late '60s that Mead Paper decided to add the No.3 paper machine and off machine coater (OMC) to its mill in Escanaba. The Beloit Corporation designed and built the machines using a lineshaft with a differential mechanical drive system and analog DC helper drives. The paper machine's lineshaft is driven with a classic steam turbine. The off machine coater's lineshaft prime mover is two \"in-line\" DC motors and respective drives. The drive systems have been up-graded several times over the years, but this paper is about the February 2002, OMC mechanical rebuild that replaced the positive infinitely variable (PIV) units on each of the machines five lineshaft differentials. The result of replacing the weakest link (the PIV) of the mechanical drive with a small horsepower AC motor/drive has increased the speed and control capability of the off machine coater, much to the delight of operators.","PeriodicalId":189773,"journal":{"name":"Conference Record of 2004 Annual Pulp and Paper Industry Technical Conference (IEEE Cat. No.04CH37523)","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121004043","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}
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