Abstract:
this research, modeling and evaluation of the protective system of Omu Aran/Otun
33 kV feeder network is considered and a search for the protective system
improvement is obtained. System data of the feeder network were obtained to create
the feeder network’s load flow analysis and short circuit analysis using Electrical
Network Modeling and Simulation software tool called Electrical Transient Analyzer
Program (ETAP). The software creates an electrical digital twin and analyzes
electrical power system dynamics, transients and protection. In Nigeria, power supply
availability, sufficiency and reliability are major operational challenges. In power
system, sometimes faults occur and affect system reliability. Proper evaluation of the
operations of the protective system is important to identification of design deficiency,
component failure and incorrect settings which will improve the reliability of the
feeder network. A short circuit analysis was performed in addition to the load flow
analysis which tells the possible fault currents in the system. The three-phase, lineground (LG), line-line (LL) and line-line-ground (LLG) fault currents for a fault on
each bus respectively. The load flow analysis was carried out to identify the conditions
of the network while the short circuit analysis was carried out to determine the faults
currents associated with the network. The load flow results: percentage voltage profile
obtained from the load flow result shows that the voltage values at the buses fall
within the permissible limit with the highest and lowest voltages of 100.06V and
98.07V respectively. Also, the percentage loading results as show that the Aaye
Transformer is critical with percentage loading of 298.7%. The percentage voltage
profile of the network under fault shows that the network cannot regain its stability
under fault conditions. The network experience a worst and best voltage dip of 30.2%
and 11.7% at Ilogbo and Imode Ekiti respectively.
