Experimental analysis of a DC bucking motor blocking geomagnetically induced currents

A. A. Fardoun, E. F.F. Fuchs, M. A.S. Masourn

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


An experimental study investigates the performance of a dc bucking motor for the blocking of geomagnetically induced currents (GICs) within a 3 kVA/ 416 V three-phase distribution feeder. This blocking method consists of connecting a separately excited dc motor between neutral and ground of a Y-grounded transformer consisting of a bank of three single-phase transformers. Losses and currents of the transformer and the blocking device are measured at no-load, rated-load, unbalanced-load. and line-to-neutral short circuit conditions without and with GICs. Thereafter, the dc ac and total λ-i characteristics of one single-phase transformer of the above mentioned transformer bank are simultaneously measured using an arbitrary waveform generator, a power amplifier and a digital data acquisition network. These λ-i characteristics -where the dc bias current is a parameter- are then used to model a single-phase transformer under dc bias current conditions (e.g., assumed Gles) and to calculate voltages and currents of a single-phase transformer when subjected to Gles. The simulated signals are then compared with measured time functions.

Original languageEnglish
Pages (from-to)88-99
Number of pages12
JournalIEEE Transactions on Power Delivery
Issue number1
Publication statusPublished - Jan 1994
Externally publishedYes


  • neutral blocking device
  • transformer modeling
  • transformer saturation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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