Remaining service life diagnostic technology of insulators for power distribution equipment

Shinsuke Miki*, Hiroshi Okazawa, Taketoshi Hasegawa, Sei Tsunoda, Hiroshi Inujima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The authors have developed a remaining service life diagnostic technology for insulators, which are important parts involved in determining the service life of power distribution equipment. Application of chemical evaluation and the Mahalanobis-Taguchi (MT) method enabled them to diagnose the insulators' degree of deterioration with great accuracy and nondestructively onsite. The theory derives the threshold value of surface resistivity for electric discharge initiation calculated based on the diagnostic results from the MT method and the year in which the master curve of service life and the threshold value intersect. It was clarified that a remaining service life could be predicted by this technology, because there was a good relationship between the check examination results of electric discharge initiation in the laboratory and the results the authors found.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number2
Publication statusPublished - 2009 Apr 30


  • Chemical evaluation
  • Electric discharge
  • Insulators
  • Mahalanobis-Taguchi method
  • Power distribution equipment
  • Remaining service life diagnosis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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