Adaptive protection algorithm for overcurrent relay in distribution system with DG

Byung Chul Sung, Soo Hyoung Lee, Jung Wook Park, A. P.S. Meliopoulos

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


This paper proposes the new adaptive protection algorithm for inverse-time overcurrent relays (OCRs) to ensure their proper operating time and protective coordination. The application of the proposed algorithm requires digital protection relays with microcontroller and memory. The operating parameters of digital OCRs are adjusted based on the available data whenever system conditions (system with distributed generation (DG)) vary. Moreover, it can reduce the calculation time required to determine the operating parameters for achieving its purpose. To verify its effectiveness, several case studies are performed in time-domain simulation. The results show that the proposed adaptive protection algorithm can keep the proper operating time and provide the protective coordination time interval with fast response.

Original languageEnglish
Pages (from-to)1002-1011
Number of pages10
JournalJournal of Electrical Engineering and Technology
Issue number5
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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