Determining Underground Network High Harmonic Conditions and Assessing Impact on the Grounding System or Grounding Protections.

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dc.contributor.advisorVandandorj Ankhbayr
dc.contributor.authorSugarragchaa Tsevlee
dc.contributor.supervisorAriunbolor Purvee
dc.contributor.supervisorDorjsuren Yandagsuren
dc.date.accessioned2024-11-06T11:08:48Z
dc.date.available2024-11-06T11:08:48Z
dc.date.issued2024-05-10
dc.description.abstractThis thesis investigates the high harmonic conditions in the underground electrical network of the Oyu-Tolgoi mine, analyzing their effects on the grounding system and protection devices. The research focuses on the 47th harmonic, notably dominant due to the mine's extensive use of DC-powered production hoists and rectifier systems. By collecting and analyzing harmonic data from substations 1118-SWG-2001 and 1855-SWG-2001, statistical analyses revealed a strong negative correlation between Total Harmonic Distortion (THD) and load current. Higher load currents reduced THD, but the persistent presence of high-order harmonics posed a significant risk to grounding protection. The 47th harmonic, in particular, exceeded both MNS and IEC standards, suggesting a potential for resonance and nuisance tripping in grounding protection systems. The thesis identifies the need for targeted harmonic filtering, updated protection relays, and continuous monitoring to mitigate these issues. Recommendations include installing advanced harmonic filters, implementing regular system audits, upgrading protective relays, and conducting real-time system monitoring. These solutions will help ensure the reliability and safety of the Oyu-Tolgoi mine's electrical infrastructure while providing actionable strategies for maintaining uninterrupted operations and adequate grounding protection.
dc.identifier.urihttps://gmitlibrary.net/handle/123456789/36
dc.language.isoen
dc.publisherGerman Mongolian Institute for Resouce and Technology
dc.titleDetermining Underground Network High Harmonic Conditions and Assessing Impact on the Grounding System or Grounding Protections.
dc.typeThesis

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