Line outage detection using phasor angle measurements

Joseph Euzebe Tate, Thomas J. Overbye

Research output: Contribution to journalArticlepeer-review


Although phasor measurement units (PMUs) have become increasingly widespread throughout power networks, the buses monitored by PMUs still constitute a very small percentage of the total number of system buses. Our research explores methods to derive useful information from PMU data in spite of this limited coverage. In particular, we have developed an algorithm which uses known system topology information, together with PMU phasor angle measurements, to detect system line outages. In addition to determining the outaged line, the algorithm also provides an estimate of the pre-outage flow on the outaged line. To demonstrate the effectiveness of our approach, the algorithm is demonstrated using simulated and real PMU data from two systems - a 37-bus study case and the TVA control area.

Original languageEnglish (US)
Pages (from-to)1644-1652
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number4
StatePublished - 2008
Externally publishedYes


  • Event detection
  • Line outages
  • Phasor measurement units

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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