Neutral Resistance Grounding in Power Systems

#research #electric #power #protection

Neutral resistance grounding has been utilized to make power systems safer for more than 70 years. There are conditions where a resistively grounded power system can become unsafe, and those instances can be discovered through continuous monitoring of the NGR resistance value and parasitic loss impedance. Upon measuring a hazardous condition, the power system can be de-energized. Continuous monitoring devices have been developed and deployed but have shortcomings when measuring the value of the neutral grounding resistor and non-fundamental frequency ground-fault currents. The authors describe a novel monitoring system to accurately measure the resistance value of the neutral grounding resistor (NGR), the impedance of parasitic losses between the neutralizing point and protective-earth, evaluate non-fundamental frequency ground-fault current, and reduce nuisance tripping. The elements of the proposed device are discussed and analyzed in detail. Results from testing components of the proposed method are provided and discussed.

  Date and Time




  • Date: 30 Oct 2023
  • Time: 03:00 PM to 03:50 PM
  • All times are (UTC-06:00) Mountain Time (US & Canada)
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  • 501 E. Saint Joseph St
  • Rapid City, South Dakota
  • United States 57701
  • Building: EEP208

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Kris Jensen Kris Jensen of Littelfuse/South Dakota School of Mines


Kristophor Jensen is pursuing his Ph.D. in Electrical Engineering. He earned a B.S. Computer Engineering in 2001 as well as earning a M.S. Electrical Engineering in 2002 from South Dakota School of Mines and Technology. Since 2002, Kris has been employed as an Electrical Engineer performing research and product development within the aerospace industry and industrial electronics industry. Kris has worked for Littelfuse since 2011 as a Principal Electrical Engineer developing protection relays to enhance electrical safety for personnel and equipment. His Ph.D. research will focus on enhancing the speed and accuracy of electrical arc detection algorithms and protection relay education under Dr. Long Zhao at South Dakota School of Mines and Technology