A cooperative protection system with an agent model

Yasushi Tomita*, Chihiro Fukui, Hiroyuki Kudo, Jun Koda, Kuniaki Yabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)


We proposes the new concept "relay agent" to realize a cooperative protection system, which consists of distributed equipment combined with a communication network to cooperate in realization of adaptive protection functions. Relay agents move between equipment to utilize data and functions distributed over the power system. In the paper, relay agents are classified by their roles, and protection functions under some typical conditions are simulated. Consideration based on the simulations indicate that the concept enables the protection system to keep an isolated zone minimum against any changes in power system conditions and to secure high reliability of the protection system with less redundant hardware. The new concept "relay agent" will provide a powerful means of advanced protection functions by combination of micro processor technology and information communication technology.

Original languageEnglish
Pages (from-to)1060-1066
Number of pages7
JournalIEEE Transactions on Power Delivery
Issue number4
Publication statusPublished - 1998
Externally publishedYes


  • Agent Model
  • Cooperation
  • Protection System
  • Protective Relay
  • Relay Agent

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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