Out-of-step protection in power system

Mohd Asim Aftab, Muhammad M. Roomi, Charalambos Konstantinou, S. M.Suhail Hussain

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Scopus citations


Power system protection requires the isolation of a healthy part of the power system from the faulty section. If a fault is detected before its occurrence, then corrective action could prevent much damage to the system and results in a reliable power supply. Out-of-step (OOS) is a condition in which certain disturbances in the power system can lead to a loss of synchronism between parallel operating generators or between different areas of the power system. Such conditions, if detected, in a timely manner could prevent the system from collapsing and finally blackouts. This chapter prevents a detailed survey of OOS protection in power systems.

Original languageEnglish (US)
Title of host publicationPower System Protection in Future Smart Grids
Subtitle of host publicationAchieving Reliable Operation with Renewable Energy, Electric Vehicles, and Distributed Generation
Number of pages28
ISBN (Electronic)9780323917803
ISBN (Print)9780323972659
StatePublished - Jan 1 2023


  • blackouts
  • distance relay
  • fault
  • Out-of-step (OOS) protection
  • power swings

ASJC Scopus subject areas

  • General Engineering


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