An investment level decision method to secure long-term reliability

Satoshi Bamba*, Kuniaki Yabe, Tomomichi Seki, Tetsuji Shibaya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The slowdown in power demand increase and facility replacement causes the aging and lower reliability in power facility. And the aging is followed by the rapid increase of repair and replacement when many facilities reach their lifetime in future. This paper describes a method to estimate the repair and replacement costs in future by applying the life-cycle cost model and renewal theory to the historical data. This paper also describes a method to decide the optimum investment plan, which replaces facilities in the order of cost-effectiveness by setting replacement priority formula, and the minimum investment level to keep the reliability. Estimation examples applied to substation facilities show that the reasonable and leveled future cash-out can keep the reliability by lowering the percentage of replacements caused by fatal failures.

Original languageEnglish
Pages (from-to)329-335+40
JournalIEEJ Transactions on Power and Energy
Issue number1
Publication statusPublished - 2008
Externally publishedYes


  • Facilities life
  • Facilities replacement
  • Investment level
  • Life-cycle cost

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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