2026-09-20T23:44:01Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/90752 2023-07-11 col_2142_5131 com_2142_5130

Haran, Kiruba Sivasubramaniam Harmukh, Sajal Kumar 2016-07-07T20:27:18Z 2016-07-07T20:27:18Z 2018-07-08T09:15:20Z 2016-04-18 2016-05 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). No. of bitstreams: 4 HARMUKH-THESIS-2016.pdf: 6651749 bytes, checksum: 00e1cd82e400b82e58302f33d61a629d (MD5) latex files.7z: 4627885 bytes, checksum: 3850394aa5cf93c3c7d05cc88f61573c (MD5) pics.7z: 8371587 bytes, checksum: ca57ab43a5ba423d2da702ecdc43568f (MD5) LICENSE.txt: 4210 bytes, checksum: 8823d7002a03b9ea3b1dbcc9d623303c (MD5) Previous issue date: 2016-04-18 Embargo set by: Seth Robbins for item 93104 Lift date: 2018-07-07T20:28:14Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 93104 Lift date: 2018-07-07T20:35:34Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 93104 on 2018-07-08T09:15:20Z. application/pdf http://hdl.handle.net/2142/90752 en Copyright 2016 Sajal Harmukh retaining ring arcing diagnosis turbogenerator Diagnosis of arcing in retaining rings of turbogenerators text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Thesis M.S.