Improvement of Bulk Power Supply to Ada-George Axis of Port Harcourt: A Case Study of Port-Harcourt Town/Rumuosi 132/33kV Sub-Transmission Station 33KV Feeders Feeding the Axis

摘要

Power Supply to Ada-George axis of Port Harcourt has been unreliable and posing danger to thepopulace within the axis. Some area of the Ada- George axis is fed from the 132/33kV Port-Harcourt Town(Zone 4), mainly on Rumuolumeni feeder and UST feeder; and the 132/33kV Rumuosi sub-transmissionsubstation in Obio-Akpor Local Government area of River State. This research is targeted to proffer solution tothe area under consideration by providing bulk power supply. The application of network reconfiguration,reactive power compensation (Capacitor Bank) at strategic locations were able to enhanced the voltage profile.The networks were modeled using ETAP software from base-case to improved-case. Due to the system networksand fast convergence requirement Newton-Raphson load flow technique was used in the simulation. The variousdata collected are presented within. The base- case simulation results for Rumuolumeni feeder, UST feeder, andRumuosi33kV feeders showed that they all experienced under voltages, inadequate power supply and someoverloaded transformers. The voltage profile for Rumuolumeni, UST and Rumuosi 33KV feeders were obtainedfrom the simulation of the(base-case) with ETAP software. The obtained results for Rumuolumeni (93.2%), UST(92.84%) and Rumuosi (89.7%) of the nominal bus voltage of 33kV falls short of the acceptable limit of (33kV ±5%). Net power received (supplied load) by the three feeders in the base-case shows that only 72%-75% of theconnected loads received power. After rigorous reconfiguration and applying network optimization techniques,the Rumuolumeni and UST feeders were integrated into 132/33kV Rumuosi sub-transmission substation torelieve the 132/33kV Port-Harcourt Town sub-transmission substation (Zone4) from excessive loads connected.The Ada-George axis of western Port-Harcourt is fully revamped having upgraded the Rumuosi TS to 3x 60MVA, 132/33kV transformers; The result for the simulation of the improved- cases showed that the voltageprofile for New Rumuolumeni, New UST and Rumuosi 33kV feeders improved to 99.15%, 98.82% and 98.02%ofthe nominal voltage respectively. These results fall within the acceptable limit of 95%-105% of the nominalvoltage. The net power received by the New Rumuolumeni, New UST and Rumuosi 33kV feeders have beenimproved to 98.24%, 94.78% and 97.96% of the connected loads in MVA respectively. Three numbers of 30-36MVar capacitor banks were added into the feeders’ networks to compensate for reactive power loss. A new132/33kV Rumuolumeni sub-transmission substation is proposed, taking a tee-off from the Omoku TS lines atEmohua for future expansion to the neighboring communities.