Flexible inverse overcurrent relaying using a microprocessor

Author

Kramer, Cheryl A. ; Elmore, Walter A.

Author_Institution

Westinghouse Electr. Corp., Coral Springs, FL, USA

Volume

5

Issue

2

fYear

1990

fDate

4/1/1990 12:00:00 AM

Firstpage

915

Lastpage

923

Abstract

The fundamentals of inverse time overcurrent relaying, recent changes in transformer characteristic curves, and a flexible microprocessor-based relay that has wide application possibilities are described. Insight into the process of selecting a particular time-current operating characteristic shape for a given application is provided. Guidelines are presented for the selection of a setting for an instantaneous-trip device based upon its transient reach tendencies. It is concluded that the availability of a microprocessor-based inverse time overcurrent relay that has selectable characteristics built in will greatly relieve the application difficulties that have been associated historically with their fixed-characteristic electrochemical counterparts

Keywords

microcomputer applications; overcurrent protection; power system computer control; power system protection; relay protection; instantaneous-trip device; inverse overcurrent relaying; microprocessor; overcurrent protection; power system computer control; power system protection; relay protection; time-current operating characteristic; transformer characteristic curves; transient reach; Circuit faults; Current transformers; Digital relays; Microprocessors; Power system relaying; Power system transients; Protection; Protective relaying; Shape; Springs;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.53102

Filename

53102