Adaptive filtering for noise reduction in the input circuits of protection relay systems

Masahide Abe, Shunsuke Koshita, Masayuki Kawamata, Shogo Miura, Tomoyuki Kawasaki, Katsuhiko Sekiguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


This paper describes an adaptive filtering to reduce noise in the analog input circuits of microprocessor-based protection relay (digital relay) systems. Considering that digital relays tend to have multiple functions, it is important to raise signal to noise ratios (SNR) in analog input circuits to a level that will satisfy the requirements of these functions. We have realized a noise reduction method employing an adaptive filter which can be generally applied; not only within digital relays but also for IEDs in substations and independent of protection schemes. This paper presents the concept of this method and illustrates this effectiveness using a number of examples and experimental results.

Original languageEnglish
Title of host publicationIEEE PES General Meeting, PES 2010
Publication statusPublished - 2010 Dec 6
EventIEEE PES General Meeting, PES 2010 - Minneapolis, MN, United States
Duration: 2010 Jul 252010 Jul 29

Publication series

NameIEEE PES General Meeting, PES 2010


OtherIEEE PES General Meeting, PES 2010
Country/TerritoryUnited States
CityMinneapolis, MN


  • Adaptive filter
  • IED
  • LMS algorithm
  • MATLAB/Simulink
  • Noise reduction
  • Protection relay

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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