Analysis of Akangba Transmission substation protection system

Abstract

The challenges of the Nigeria power system have deprived the yearning electricity consumer access to stable power supply. Apart from the incessant load shedding due to inadequate power generation capacities, poor power system protection design, lack of constant protection system review after several changes to the power network is one of the contributing factors for unstable power system and unplanned outages. The network engineers must devise method of reviewing the protection settings as changes are made to power system components. This motivates the adoption of power system symmetrical fault analysis model presented herein. The model was applied to Akangba Transmission substation using the network planning software (NEPLAN software). The results show the fault current flowing through every part of the network. The effect of network expansion, switching Scenarios /Component changes on the fault current and protection scheme was also verified. Protection engineers must therefore take note of changes in the power network configuration when planning protection coordination and relay setting. The method is interesting and can be used as a template for reviewing protection scheme when changes are made on the power network. This will ensure better power protection management, enhance stable power supply and reduce damage to expensive power components.