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Prof. Fahmy Metwali Ahmed Bendary :: Publications:

Title:
DESIGN OF PROTOTYPE NON DIRECTIONAL OVERCURRENT RELAY MICRO-CONTROLLER-BASED
Authors: Mohamed A. ALI, Fahmy M. BENDARY
Year: 2013
Keywords: Not Available
Journal: 22nd International Conference on Electricity Distribution
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: International
Paper Link: Not Available
Full paper Not Available
Supplementary materials Not Available
Abstract:

This paper presents a design of non-directional overcurrent relay micro-controller-based having the advantages of low cost, high performance and can be totally manufactured by local manufacturers. The proposed overcurrent relay can be employed to protect feeders of distribution systems for overcurrent and earth fault protection. Also, the proposed relay is considered a high speed overcurrent relay, thus it can be used for restricted earth fault applications. The main hardware platform is designed and tested with pickup accuracy not more than 0.001In and total scan cycle not more than 1ms which make this relay very accurate and adequate for fast tripping applications. . The relay has the capability to treat the incoming analogue signals of voltages and currents via the Discrete Fourier Transform (DFT) through the designed main hardware platform. In this way if the relay protects a distribution power transformer, it can detect the inrush conditions via the second harmonic detection. Also it can detect the over excitation via the fifth harmonic calculations to block the abnormal tripping for more reliable and secure distribution systems.

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