Design and Testing of a Frequency-Selective Grounding for 3 phi Power Transformers

Saleh S. A., Onge X. F. S., Richard C., ÖZKOP E., Panetta S. A. R.

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, cilt.56, sa.1, ss.74-87, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 56 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1109/tia.2019.2946523
  • Dergi Adı: IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
  • Derginin Tarandığı İndeksler: 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
  • Sayfa Sayıları: ss.74-87
  • Anahtar Kelimeler: Frequency-tuned circuits, ground potentials, 3 phi power transformers, power system grounding, power system harmonics, transformer exciting current, FAULT PROTECTION, INDUSTRIAL, GENERATOR
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

Three-phase power transformers can have their windings configured to create local neutral points, which can be connected to ground. The grounding of a 3 phi power transformer is intended to limit ground currents (including fault currents) and limit ground potentials. These objectives can be translated into the resistive grounding that is usually designed based on system ratings and transformer parameters. The resistive grounding, however, can impact the flow of the harmonic components present in the exciting currents of a3 phi power transformer. As a result, undesired harmonic components are induced in primary and secondary voltages. This article presents the design and performance of a frequency-selective grounding that can achieve the objectives of grounding a 3 phi power transformer. The developed grounding is designed to provide a resistive path for low-frequency currents (faults), and to create a low impedance path for high-frequency currents (harmonics). The frequency-selective grounding is experimentally tested for a 3 phi power transformer with different primary and secondary winding configurations, different fault types, and source grounding. Test results show that the developed grounding can reduce the ground potential, harmonic distortion in primary and secondary voltages, and ground fault currents with a minimum interference with ground fault protective devices.