Open AccessDistance protection in 150/60 kV transformer 60 kV feeders: two real blackout case studies
Author(s) -
Bak Claus Leth,
Hansen Magnus Lind,
Nissen Jens Ole
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.0144
Subject(s) - blackout , transformer , reliability engineering , electric power system , computer science , protective relay , electrical engineering , engineering , power (physics) , voltage , physics , quantum mechanics
Correct setting of protection relays are of major importance to the reliable operation of the power system. The root cause of two consecutive blackouts is analysed and shown to origin from a combination of several minor errors which all can be related to an insufficient/wrong setting of the distance relays and their optional functions together with insufficient testing when putting into operation. The learning lessons are discussed and outlined in order to avoid future blackouts having similar origin.