Pub Date : 1900-01-01DOI: 10.1109/ICPS.1994.303568
T. Lindsey, D. Zipse, T.J.K. Krob
The paper details the effort to determine the adequacy of various methods of grounding/earthing electrodes installed in the alkaline, highly mineralized soil of the Las Vegas, Nevada area The grounding electrode testing program outlined has been prepared to address a number of questions relating to grounding [earthing] electrodes and soil conditions in the Clark County, Las Vegas Valley area. The results of the on going testing are presented. The object of the testing was to answer questions such as: Will the electrodes provide adequate safety from personnel electrification/electrocution standpoint? Will the electrodes provide safety of electrical system physical integrity? Can the soil adequately conduct the proper amount of current? What effect does moisture have on the soils and electrode? Will the resistance of the electrode change over time? Will an electrode, acceptable initially, be able to carry adequate current later? The paper discusses the problems of getting the project started and the cooperation that resulted from the electrical industry. Details of the test fields are presented and the test methods discussed. Preliminary results of the ongoing ten year test facilities are presented.<>
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Pub Date : 1900-01-01DOI: 10.1109/ICPS.1994.303559
S. J. Briggs, D. Savignon, P. Krein, M.S. Kim
Power feeder electromagnetic interference/radio frequency interference (EMI/RFI) filters are widely used in the US Army and industry for filtering unwanted signals on power lines supplying sensitive loads such as computers and communication equipment. Typically these low pass filters are passive circuits designed to attenuate frequencies above 10 kHz. Under 60 Hz sinusoidal conditions, the filters dissipate little power. But when nonlinear loads are present (such as those associated with computers, adjustable speed drives, electronic power supplies, and communication equipment), significant power dissipation can occur within the filters. This can shorten filter lifetime or even lead to complete filter failure. Laboratory testing and mathematical analyses were performed on a selected EMI/RFI filter to: (1) determine its frequency response in the 60 Hz to 3 kHz range; (2) identify the filter components that dissipate the most power when subjected to harmonic currents; and (3) measure filter component temperature rises when harmonic line currents are present. It is shown that power line harmonics, not considered by EMI/RFI filter manufacturers, interact with filter component parasitics and cause considerable power dissipation in the filters.<>
{"title":"The effects of nonlinear loads on EMI/RFI filters","authors":"S. J. Briggs, D. Savignon, P. Krein, M.S. Kim","doi":"10.1109/ICPS.1994.303559","DOIUrl":"https://doi.org/10.1109/ICPS.1994.303559","url":null,"abstract":"Power feeder electromagnetic interference/radio frequency interference (EMI/RFI) filters are widely used in the US Army and industry for filtering unwanted signals on power lines supplying sensitive loads such as computers and communication equipment. Typically these low pass filters are passive circuits designed to attenuate frequencies above 10 kHz. Under 60 Hz sinusoidal conditions, the filters dissipate little power. But when nonlinear loads are present (such as those associated with computers, adjustable speed drives, electronic power supplies, and communication equipment), significant power dissipation can occur within the filters. This can shorten filter lifetime or even lead to complete filter failure. Laboratory testing and mathematical analyses were performed on a selected EMI/RFI filter to: (1) determine its frequency response in the 60 Hz to 3 kHz range; (2) identify the filter components that dissipate the most power when subjected to harmonic currents; and (3) measure filter component temperature rises when harmonic line currents are present. It is shown that power line harmonics, not considered by EMI/RFI filter manufacturers, interact with filter component parasitics and cause considerable power dissipation in the filters.<<ETX>>","PeriodicalId":197013,"journal":{"name":"Proceedings of Industrial and Commercial Power Systems Conference","volume":"36 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":"130981580","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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