PERFORMANCE ASSESSMENT OF DIGITAL DISTANCE RELAY ALGORITHMS
Date
1988-12
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Degree Level
Masters
Abstract
With recent advancements in micro-computer technology, the use of micro-processors for distance protection has received much attention from power system research groups. Different algorithms have been developed over the years for use in digital distance relays. The performance of the algorithms need to be assessed off-line before any implementation in an actual system. Some of the general characteristics of the algorithms that can be examined are
frequency reponse, effect of decaying dc on the accuracy of calculated phasors and noise suppression qualities. The performance of an algorithm can also be assessed using power system fault data.
This thesis examines the suitability of four long window relay algorithms for protecting transmission lines. The frequency response, the effect of decaying dc on the accuracy of the calculated phasors and noise suppression characteristics of each algorithm is examined. The ability of each algorithm to accurately detect faults and to estimate the distances of the faults
is also checked using data obtained by computer simulations. The speed with which the algorithms detect faults, that are in the operating zone of a relay, is illustrated using the movement of the trajectories of the calculated impedances from their pre-fault values to the post-fault values.
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Degree
Master of Science (M.Sc.)
Department
Electrical and Computer Engineering
Program
Electrical Engineering