International Journal of Advanced Engineering and Technology

Authors
AE Airoboman, EA Ogujor

Abstract
In this paper, risk assessment was carried out in the Nigerian Power System Network NPSN using the Transmission Company of Nigeria TCN Benin City as a case study. The risk assessment was carried out using historical data collated from the station of interest for a period of five years (2011-2015) on the seven 33kV feeders in the station. Using the Feeders’ Criticality Technique FCT, the risk level of each of the feeders was estimated, recorded and the summarized results interpreted graphically using spreadsheet. The following Average Criticality Values ACVs: 419.8, 359.6, 162.3, 31.5, 15.7, 7.7 and 4.7 were estimated for Koko, Guinness, Ikpobadam, Switchstation, Etete, Nekpenekpen and GRA feeders respectively. From the analysis, the duo of Koko and GRA feeders were identified as the weakest and strongest link in the network. From the estimated ACVs, none of the feeders could be said to possess a negligible risk value hence an improvement in the operation and maintenance of the feeders is necessary. The paper, therefore, can serve as guide for sound maintenance judgment and could also help in the identification of risk in the system by operators.