A Log-Tabel Based Algorithm For Implementing Microprocessor Time-Overcurrent Relays

1 September 1982

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems

Vol. PAS-101 (9) , 3563-3567
https://doi.org/10.1109/TPAS.1982.317583

Abstract

The difficulties that arise in implementing the time-overcurrent relay characteristic on microprocessor systems are due mainly to two factors. Firstly, data acquisition is usually linear whereas curve scales are logarithmic. Secondly, we have to calculate the main variable, namely the normalized fault current given as the ratio of the measured line current to the preset pickup value in a system in which the latter quantity should preferably be adjustable.

Keywords

MICROPROCESSORS
RELAYS
FAULT CURRENTS
CURRENT MEASUREMENT
POWER SYSTEM RELAYING
POWER SYSTEM MODELING
DATA ACQUISITION
DATA PROCESSING
ERROR CORRECTION
PROM

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