A probabilistic approach to setting distance relays in transmission networks

Author

De Sá, J. Pinto ; Afonso, J. ; Rodrigues, R.

Author_Institution

Dept. de Engenharia Electrotecnica e de Comput., Inst. Superior Tecnico, Lisbon, Portugal

Volume

12

Issue

2

fYear

1997

fDate

4/1/1997 12:00:00 AM

Firstpage

681

Lastpage

686

Abstract

The setting of back-up zones in distance relays has to deal with fault current infeeds between the relay and remote faults. Traditional approaches to this problem are conservative, some times leaving portions of a power system without sensitive or selective back-up protection. In this paper, a probabilistic model for the relay errors resulting from the variation of the infeeds is developed. Other measurement inaccuracies are also considered in order to build a probabilistic approach to setting all zones of distance relays. The developed concepts are associated to automatic tools for computer aided protection coordination and applied to the Portuguese transmission grid

Keywords

fault currents; power system protection; power system relaying; probability; relay protection; transmission networks; Portugal; back-up zones setting; computer aided protection coordination; distance relays; fault current infeeds; measurement inaccuracies; probabilistic model; relay errors; transmission grid; transmission networks; Circuit faults; Fault currents; Intelligent networks; Network topology; Power system modeling; Power system protection; Power system relaying; Protective relaying; Relays; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.584342

Filename

584342