Ground Fault Protection in Frequency-Selective Grounded Systems Fed by a Single Transformer

S. Saleh, D. Jewett, J. Meng, M. Valdes, E. Ozkop, A. Yuksel, A. Al-Durra, S. Panetta

Research output: Contribution to journalArticlepeer-review


This paper presents experimental results for performance tests of ground fault protection schemes applied to a frequency-selective grounded system supplied by a single transformer. Frequency selective grounding systems are designed to present low ground impedance (similar to solid grounding) to high frequency zero-sequence current components and impedance like that of a low-impedance grounded system to fundamental zero-sequence components. The variable impedance of the grounding scheme can impact the response of ground fault protection in terms of accuracy and timing. The laboratory setup includes a single 35kVa 3-phase source transformer with a 340/208-volt secondary voltage. Experimental results detailed in this paper demonstrate the response that may be expected of various types of GFP schemes under fault and non-fault events and conditions.

Original languageBritish English
Pages (from-to)1-8
Number of pages8
JournalIEEE Transactions on Industry Applications
StateAccepted/In press - 2022


  • 3ϕ power transformers
  • Circuit faults
  • Fault protection
  • Frequency-selective grounding
  • ground fault protection
  • Grounding
  • Harmonic analysis
  • Impedance
  • power system faults
  • Power system harmonics
  • Relays


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