IJET Vol. 7, Issue 4, December 2022
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Öğe Reliability Assessment of Power System Network: A Detailed Review(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2022) Airoboman, Abel EhimenDue to an increase in technological advancement and population, there is also a corresponding increase in the demand of electrical energy within Nigeria. Utility is presently characterized by suppressed demand due to the poor reliability inherent in the system. Utility, therefore, considers load shedding as a way out to ensure that the available power from each of the feeders from a network gets to its respective customers at any giving time they choose for the customer while the time the customers choose for themselves remains immaterial. However, in recent times, increased in downtime has been observed as a result of various faults and failures noticeable on the network and this has led to outrage by the customers who only considered protests as the only way out in expressing their dis-satisfaction with the system. This anomaly, therefore, arouses the interest for this study to carry out a detailed approach to carry out a review on the state of the reliability of the power system network in Nigeria and juxtaposing it with what is tenable outside the country with a view to determine the present state of the network and how it has fared with respect to time.Öğe Failure’s Severity Affecting Railway Operation Based on Sensitivity Analysis: A Case Study of Addis Ababa Light Rail Transit (AALRT)(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2022) Minwuyelet, Ruhama; Tilahun, DanielOperation delays and trip cancelations affect the reliability of the operation and customer’s satisfaction. This review work adopts a case study of AALRTS operation system employing operation data and incident records of AALRTS. The purpose of this paper is assessing the failures frequency and the time it takes to get back to its operation aiming that how sensitive it is for the reliability of the operation. An extensive literature review has been used to approach the problem in which the sensitive failure`s analysis methods have been identified. The method that has been used to investigate the failure`s magnitude was sensitivity failure analysis by considering the case study of AALRTS. The method has been implemented to identify different failure modes through the analysis of the case how sensitive the failures are to the normal operation. The results that have been discovered from the analysis are: - the safety incidents and equipment failures are the major groups that affect the normal operation of AALRTS. When we go to the depth level-crossing incidents and power outages are the major sensitive failures (from safety incidents and equipment failures) that can reduce the reliability of the operation dramatically. Finally the researcher would like to recommend that giving a due attention for those sensitive failures might improve the reliability of the railway operation.
