University of Khartoum

Overcurrent Protection Coordination Case Study: Baleela Oil-Field Network

Overcurrent Protection Coordination Case Study: Baleela Oil-Field Network

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Title: Overcurrent Protection Coordination Case Study: Baleela Oil-Field Network
Author: Elniema, Ahmed Hatim Abdelbari; Babiker, Ahmed Omer Mohamed; Ibrahim, Mohamed Ali Mohamed
Abstract: Continuous and reliable power supply is the main goal and target for power system networks. In this regard, many methods have been developed to enhance the performance of power supply systems. The present research is initiated to investigate Baleela power network, because this network is faced by blackouts several times per year during last couple of years, this led to severe lack of production during blackout times beside the maintenance and operation cost impact. Using ETAP software as analysis tool, the network was drawn. The data for each component in the network was collected from a site visit to Baleela. After running the simulator, different fault scenarios were created to examine the existing protection system schemes and different miss-operations results were obtained as a response of protection system to the abnormal conditions. After studying this network, it is noticed that one of the main reasons for blackouts is the relay setting miss-coordination caused by the use of only (DMT) characteristics. An optimum characteristic (IDMT) for the relays was chosen, and a completely new coordination scheme is designed which starts first by coordinating the phase over-current elements, for different paths from furthest downstream up to the generators. Next the earth fault relays are coordinated for the same paths and finally the instantaneous element as a backup protection was applied successfully. The new relay setting coordination has been applied to all relays in the five main substations as a result from this study. The sequence of operation is well improved and as a result the total blackouts frequency is significantly decreased. Valuable recommendations were suggested.
URI: http://khartoumspace.uofk.edu/123456789/25760
Date: 2017


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