{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/90752"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/90752","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Diagnosis of arcing in retaining rings of turbogenerators","abstract":"Retaining rings are an important and most highly stressed component of the entire turbogenerator system. Arcing in retaining rings is a very serious problem and could easily escalate to a full-blown failure. In this project we diagnose arcing in the retaining rings. We determine the most likely mechanism by which arcing occurs and the category of events which lead to it. Specifically, we try to test two different mechanisms which could have led to the arc marks. The first one is sparking due to high field efects (or high voltage gradient across the contact junction) and the other is a make-and-break contact arcing owing to the presence of inductance in the system. Experiments performed to measure the contact resistance between the retaining ring and mild iron piece indicate that even very high fault currents cannot produce the voltage required to cause sparking. Transient 3-D finite element simulations show that a make-and-break contact can generate localized voltage spikes, on account of small contact break, which are high enough to lead to arcing. Interestingly this can happen at relatively low currents.","abstract_html":"Retaining rings are an important and most highly stressed component of the entire turbogenerator system. Arcing in retaining rings is a very serious problem and could easily escalate to a full-blown failure. In this project we diagnose arcing in the retaining rings. We determine the most likely mechanism by which arcing occurs and the category of events which lead to it. Specifically, we try to test two different mechanisms which could have led to the arc marks. The first one is sparking due to high field efects (or high voltage gradient across the contact junction) and the other is a make-and-break contact arcing owing to the presence of inductance in the system. Experiments performed to measure the contact resistance between the retaining ring and mild iron piece indicate that even very high fault currents cannot produce the voltage required to cause sparking. Transient 3-D finite element simulations show that a make-and-break contact can generate localized voltage spikes, on account of small contact break, which are high enough to lead to arcing. Interestingly this can happen at relatively low currents.","abstract_has_math":false,"creators":["Harmukh, Sajal Kumar"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Haran, Kiruba Sivasubramaniam"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-07-07T20:27:18Z","date_published":"2016-07-07T20:27:18Z","updated_at":"2026-07-22T22:26:34Z","subjects":["retaining ring","arcing","diagnosis","turbogenerator"],"languages":["en"],"rights":["Copyright 2016 Sajal Harmukh"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/90752","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Haran, Kiruba Sivasubramaniam"]},{"key":"dc:creator","label":"Author","values":["Harmukh, Sajal Kumar"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-07-07T20:27:18Z","2018-07-08T09:15:20Z","2016-04-18","2016-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["retaining ring","arcing","diagnosis","turbogenerator"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2016 Sajal Harmukh"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/90752"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Retaining rings are an important and most highly stressed component of the entire turbogenerator system. Arcing in retaining rings is a very serious problem and could easily escalate to a full-blown failure. In this project we diagnose arcing in the retaining rings. We determine the most likely mechanism by which arcing occurs and the category of events which lead to it. Specifically, we try to test two different mechanisms which could have led to the arc marks. The first one is sparking due to high field efects (or high voltage gradient across the contact junction) and the other is a make-and-break contact arcing owing to the presence of inductance in the system. Experiments performed to measure the contact resistance between the retaining ring and mild iron piece indicate that even very high fault currents cannot produce the voltage required to cause sparking. Transient 3-D finite element simulations show that a make-and-break contact can generate localized voltage spikes, on account of small contact break, which are high enough to lead to arcing. Interestingly this can happen at relatively low currents.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01","The student, Sajal Harmukh, accepted the attached license on 2016-04-15 at 16:46.","The student, Sajal Harmukh, submitted this Thesis for approval on 2016-04-15 at 16:50.","This Thesis was approved for publication on 2016-04-18 at 13:56.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9213 on 2016-07-07 at 13:49:11","Made available in DSpace on 2016-07-07T20:27:18Z (GMT). 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Arcing in retaining rings is a very serious problem and could easily escalate to a full-blown failure. In this project we diagnose arcing in the retaining rings. We determine the most likely mechanism by which arcing occurs and the category of events which lead to it. Specifically, we try to test two different mechanisms which could have led to the arc marks. The first one is sparking due to high field efects (or high voltage gradient across the contact junction) and the other is a make-and-break contact arcing owing to the presence of inductance in the system. Experiments performed to measure the contact resistance between the retaining ring and mild iron piece indicate that even very high fault currents cannot produce the voltage required to cause sparking. Transient 3-D finite element simulations show that a make-and-break contact can generate localized voltage spikes, on account of small contact break, which are high enough to lead to arcing. Interestingly this can happen at relatively low currents.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01","The student, Sajal Harmukh, accepted the attached license on 2016-04-15 at 16:46.","The student, Sajal Harmukh, submitted this Thesis for approval on 2016-04-15 at 16:50.","This Thesis was approved for publication on 2016-04-18 at 13:56.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9213 on 2016-07-07 at 13:49:11","Made available in DSpace on 2016-07-07T20:27:18Z (GMT). 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