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

Saleh S., Jewett D., Meng J., Valdes M., ÖZKOP E., Yuksel A., ...More

IEEE Transactions on Industry Applications, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1109/tia.2022.3190992
  • Journal Name: IEEE Transactions on Industry Applications
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: 3ϕ power transformers, Circuit faults, Fault protection, Frequency-selective grounding, ground fault protection, Grounding, Harmonic analysis, Impedance, power system faults, Power system harmonics, Relays
  • Karadeniz Technical University Affiliated: Yes

Abstract

IEEEThis 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.