{"id":{"repo_id":"utc","oai_identifier":"oai:scholar.utc.edu:theses-1580"},"canonical_url":"https://search.dev.ndltd.org/etd/utc/oai:scholar.utc.edu:theses-1580","repository":{"repo_id":"utc","name":"University of Tennessee - Chattanooga","base_url":"https://scholar.utc.edu/do/oai/"},"display":{"title":"Effects of GIC Neutral Blocking Devices (NBDs) on transmission lines protection performance and potential for resonance","abstract":"Geomagnetic Induced Current (GIC) is a quasi-DC current that may have adverse effects on power system reliability. Several GIC blocking device (NBDs) designs are available, but the majority is capacitive. Concerns have arisen about the effects of NBDs on distance-protection relays. To investigate their impact, real-time simulation (of IEEE-39 bus system) with actual hardware-in-the-loop testing is utilized. The study showed that these relays are not affected by the insertion of NBDs regardless of the polarizing quantity used. However, during close-by fault, the energy through NBDs’ MOV is excessive. Also, the potential for resonance between NBDs and the system was investigated. The results indicate the possibility for resonance under steady-state imbalance, however, in most cases resonance is masked by a high damping system, thus it becomes indiscernible. But under fault conditions, even for non-resonating conditions, care is needed to avoid over-voltages by providing a backup spark-gap for MOV devices.","abstract_html":"Geomagnetic Induced Current (GIC) is a quasi-DC current that may have adverse effects on power system reliability. Several GIC blocking device (NBDs) designs are available, but the majority is capacitive. Concerns have arisen about the effects of NBDs on distance-protection relays. To investigate their impact, real-time simulation (of IEEE-39 bus system) with actual hardware-in-the-loop testing is utilized. The study showed that these relays are not affected by the insertion of NBDs regardless of the polarizing quantity used. However, during close-by fault, the energy through NBDs’ MOV is excessive. Also, the potential for resonance between NBDs and the system was investigated. The results indicate the possibility for resonance under steady-state imbalance, however, in most cases resonance is masked by a high damping system, thus it becomes indiscernible. But under fault conditions, even for non-resonating conditions, care is needed to avoid over-voltages by providing a backup spark-gap for MOV devices.","abstract_has_math":false,"creators":["Saeed, Haytham A."],"institution":"University of Tennessee at Chattanooga","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Eltom, Ahmed H.","Kobet, Gary L.; Karrar, Abdelrahman A.","College of Engineering and Computer Science"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T05:46:28Z","subjects":["Electric power system stability"],"languages":["English","eng"],"rights":[],"rights_urls":["https://rightsstatements.org/page/InC/1.0/?language=en"],"identifier_entries":[]},"links":{"outbound_url":"https://scholar.utc.edu/theses/440","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Eltom, Ahmed H.","Kobet, Gary L.; Karrar, Abdelrahman A.","College of Engineering and Computer Science"]},{"key":"dc:creator","label":"Author","values":["Saeed, Haytham A."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-12-01T08:00:00Z"]},{"key":"dc:publisher","label":"Institution","values":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"]},{"key":"dc:relation","label":"Dc Relation","values":["Masters Theses and Doctoral Dissertations"]},{"key":"dc:type","label":"Dc Type","values":["Masters theses","Text"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Electric power system stability"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["https://rightsstatements.org/page/InC/1.0/?language=en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholar.utc.edu/theses/440"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Dept. of Electrical Engineering","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."]},{"key":"dc:description.abstract","label":"Abstract","values":["Geomagnetic Induced Current (GIC) is a quasi-DC current that may have adverse effects on power system reliability. Several GIC blocking device (NBDs) designs are available, but the majority is capacitive. Concerns have arisen about the effects of NBDs on distance-protection relays. To investigate their impact, real-time simulation (of IEEE-39 bus system) with actual hardware-in-the-loop testing is utilized. The study showed that these relays are not affected by the insertion of NBDs regardless of the polarizing quantity used. However, during close-by fault, the energy through NBDs’ MOV is excessive. Also, the potential for resonance between NBDs and the system was investigated. The results indicate the possibility for resonance under steady-state imbalance, however, in most cases resonance is masked by a high damping system, thus it becomes indiscernible. But under fault conditions, even for non-resonating conditions, care is needed to avoid over-voltages by providing a backup spark-gap for MOV devices."]},{"key":"dc:title","label":"Title","values":["Effects of GIC Neutral Blocking Devices (NBDs) on transmission lines protection performance and potential for resonance"]}]}],"canonical_facts":{"dc:contributor":["Eltom, Ahmed H.","Kobet, Gary L.; Karrar, Abdelrahman A.","College of Engineering and Computer Science"],"dc:creator":["Saeed, Haytham A."],"dc:date":["2015-12-01T08:00:00Z"],"dc:description":["Dept. of Electrical Engineering","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."],"dc:description.abstract":["Geomagnetic Induced Current (GIC) is a quasi-DC current that may have adverse effects on power system reliability. Several GIC blocking device (NBDs) designs are available, but the majority is capacitive. Concerns have arisen about the effects of NBDs on distance-protection relays. To investigate their impact, real-time simulation (of IEEE-39 bus system) with actual hardware-in-the-loop testing is utilized. The study showed that these relays are not affected by the insertion of NBDs regardless of the polarizing quantity used. However, during close-by fault, the energy through NBDs’ MOV is excessive. Also, the potential for resonance between NBDs and the system was investigated. The results indicate the possibility for resonance under steady-state imbalance, however, in most cases resonance is masked by a high damping system, thus it becomes indiscernible. But under fault conditions, even for non-resonating conditions, care is needed to avoid over-voltages by providing a backup spark-gap for MOV devices."],"dc:identifier":["https://scholar.utc.edu/theses/440"],"dc:language":["English","eng"],"dc:publisher":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"],"dc:relation":["Masters Theses and Doctoral Dissertations"],"dc:rights":["https://rightsstatements.org/page/InC/1.0/?language=en"],"dc:subject":["Electric power system stability"],"dc:title":["Effects of GIC Neutral Blocking Devices (NBDs) on transmission lines protection performance and potential for resonance"],"dc:type":["Masters theses","Text"]},"updated_at":"2026-07-24T05:46:28Z"}