Evaluation of Technical Losses in Enugu 33kV/11kV Metropolis Networks

The inability of distribution system to return expected profit is undermining its integrity. This is highly due to power loss occurring on the distribution feeders. It was on this background, that this work presented the Simulation of Technical Losses in Enugu Metropolis Networks with a Case Study of Kingsway Line 1 33kV and Power House 11kV feeders. This research was implemented using the method of simulation and analysis with the help of Electrical Transient and Analysis Program, ETAP software. The work was carried out using practical field data and network extracted from Enugu Electricity Distribution Company, EEDC. The case study networks were characterized, modelled and simulated on ETAP environment using specific parameters. From the results of the simulation/analysis the technical loss, was calculated in the 33kV network to be at 2.28% and 3.02% for the 11kV network. In order to reduce technical loses to its barest minimum, the 11kV and 33kV distribution line cable sizes were upgraded by 50% and 20% respectively. Then a shunt capacitor was installed at two places in the 33kV network which were at Kingsway line1 feeder and Shoprite substation. At the 11kV network, the shunt capacitor was connected at the Nigerian Construction and Furniture Company, NCFC load center. This modification led to the improvement of the voltage at the injection substations in the 33kv network. The average voltage improved to 0.99PU. The 33kV distribution line loss experienced an 11% reduction from the initial loss. The technical loss in the 33kV network achieved an 8.9% reduction and technical loss dropped from 2.28% to 1.47%. The 11kV distribution line loss experienced reduction of 54% drop from the initial loss. The technical loss in the network dropped by 49% and technical loss dropped from 3.02% to 1.9%. The total technical losses for both feeders were calculated as 3.37% which was about 57% in reduction.