Fiber Optic Current Transformers for Transformer Differential Protection during Inrush Current: A Field Study

Nikolay Ivanov, Petr Vorobev, Janusz Bialek, Ruslan Kanafeev, Maxim Yanin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Saturation of electromagnetic current transformers (EMCTs) due to inrush current during re-energizing of a power transformer may lead to misoperation of differential protection. Fiber optic current transformers (FOCTs) can offer a solution to this problem by providing an accurate replica of the primary current during inrush conditions as they are free from saturation. This paper focuses on comparing EMCTs and FOCTs measurements of inrush current based on data obtained during a field test at a 500 kV substation. Waveform and harmonic analysis of the signals captured by a digital fault recorder from EMCTs and FOCTs reveal a significant difference in their RMS and harmonic content, thus demonstrating the influence of the saturation of the EMCTs on the current measurements. We also show that compared to EMCT, FOCTs measurements allow for better identification of the inrush current by means of DC component analysis.

Original languageEnglish
Title of host publication2021 IEEE Madrid PowerTech, PowerTech 2021 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665435970
DOIs
Publication statusPublished - 28 Jun 2021
Event2021 IEEE Madrid PowerTech, PowerTech 2021 - Madrid, Spain
Duration: 28 Jun 20212 Jul 2021

Publication series

Name2021 IEEE Madrid PowerTech, PowerTech 2021 - Conference Proceedings

Conference

Conference2021 IEEE Madrid PowerTech, PowerTech 2021
Country/TerritorySpain
CityMadrid
Period28/06/212/07/21

Keywords

  • DC ratio blocking method
  • electro-magnetic current transformers (EMCTs)
  • fiber optic current transformers (FOCTs)
  • inrush current
  • saturation

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