Nigerian National Agency for Science and Engineering Infrastructure

Abuja, Nigeria

Nigerian National Agency for Science and Engineering Infrastructure

Abuja, Nigeria
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Suleiman A.A.,University of Technology Malaysia | Suleiman A.A.,Nigerian National Agency for Science and Engineering Infrastructure | Muhamad N.A.,Universiti Sains Malaysia | Bashir N.,University of Technology Malaysia | And 4 more authors.
IET Generation, Transmission and Distribution | Year: 2017

Vegetable insulation oils in transformers have become a reality. However, they are inherently hydrophilic and can absorb much moisture. Existence of moisture in transformer insulation will generally lower the breakdown voltage of oil. Moisture will also accelerate cellulose deterioration by increasing its dc conductivity. Both oil and cellulose are components of the transformer insulation system. It is therefore important to understand how this class of oils retains their dielectric strength and their relationship with kraft paper (KP) after absorbing so much moisture. This study presents effect of moisture increase in three samples of vegetable oil and its effect on dc conductivity of KP samples immersed in the oils. The dc conductivity of the samples is calculated based on dielectric response polarisation and depolarisation current measured. The result shows that KP in vegetable insulation oil performs better when the oil samples are wetter and drying the vegetable insulation oil accelerates KP degradation. The finding will help to understand of the deterioration of cellulose when immersed in the oil. © The Institution of Engineering and Technology.


Mustafa S.,Nigerian National Agency for Science and Engineering Infrastructure | Adeshina S.,Nigerian Turkish Nile University | Dauda M.,Nigerian National Agency for Science and Engineering Infrastructure | Soboyejo W.,African University of Science and Technology
Proceedings of the 11th International Conference on Electronics, Computer and Computation, ICECCO 2014 | Year: 2014

Cervical cancer is the second highest killer of women in Sub-Sahara Africa. This is due to unavailability of adequate screening methods and inability to pay where existing methods are available. This work addresses the issue of identifying and classifying cervical cancerous tissues for images taken from a standard camera. A cost effective method is developed for the imaging of cervical cancer in developing countries by analysing images from a standard camera. The image is enhanced using noise reduction and a Canny edge detector algorithm to find the intensity of the edges. Preliminary results obtained from clinical settings and images obtained are analysed by identifying the edges of the tissues of the cervix and classifying them based on the frequency of the edges. The results show above 90% classification accuracy. This shows that image analysis algorithm has the potential to successfully diagnose cervix cancer. © 2014 IEEE.


Alghamdi A.S.,University of Technology Malaysia | Alghamdi A.S.,Technical and Vocational Training Corporation | Muhamad N.A.,University of Technology Malaysia | Suleiman A.A.,University of Technology Malaysia | Suleiman A.A.,Nigerian National Agency for Science and Engineering Infrastructure
Transactions on Electrical and Electronic Materials | Year: 2012

DGA is one of the most recent techniques developed to diagnose the fault condition on oil filled insulation transformers. There are more than 6 known different methods of DGA fault interpretation technique and so there is the likelihood that they may vary in their interpretations. A series of combined interpretation methods that can determine the power transformer condition faults in one assessment is therefore needed. This paper presents a computer program-based system developed to combine four DGA assessment techniques; Rogers Ratio Method, IEC Basic Ratio Method, Duval Triangle method and Key Gas Method. An easy to use Graphic User Interface was designed to give a visual display of the four techniques. The result shows that this assessment method can increase the accuracy of DGA methods by up to 20% and the no prediction result had been reduced down to 0%. © 2012 KIEEME.


Bolarinwa M.A.,University of Ibadan | Adetunji A.R.,Prototype Engineering Development Institute | Adewoye O.O.,Nigerian National Agency for Science and Engineering Infrastructure
Advanced Materials Research | Year: 2012

The Scanning Electron Microscope (SEM) has been used to study the adhesion of red oxide primer on selected substrates. The substrates are stainless steel, mild steel, galvanized steel and aluminium. Twenty (20 No) specimens were prepared from the four different substrate metals and examined metallographically, after coating them with red oxide primer using different methods of application. Results showed varying degrees of adherence. The red oxide primer was able to form bonds with the different substrate metals, especially with the well cleaned, primed and subsequently painted stainless steel specimen. © (2012) Trans Tech Publications, Switzerland.


Suleiman A.A.,University of Technology Malaysia | Suleiman A.A.,Nigerian National Agency for Science and Engineering Infrastructure | Muhamad N.A.,University of Technology Malaysia | Bashir N.,University of Technology Malaysia | And 3 more authors.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2014

For use as insulating liquids in power transformers, palm based oils are gaining worldwide attention as biodegradable alternatives and competitors to the petroleum based oils. However, moisture ingress into insulation oils and its effect on the oil breakdown voltage (BDV) must be studied because moisture in oil can alter the physicochemical property of oil and drastically affects the breakdown voltage. This paper presents a comparative study on effect of increasing moisture content on physical structure and BDV of three palm based insulation oils (Red Palm Oil, Refined Bleached Deodorized Palm Oil (RBDPO) and Palm Fatty Acid Ester (PFAE)) at room temperature. Insulation oil is known to have the ability to sustain its good performance up to certain percentage moisture increase. In this paper, an empirical relationship between the palm based oil BDV and the percentage moisture added was developed to approximate oil BDV at various moisture increases. Fourier Transform Infrared (FTIR) Spectroscopy was employed to investigate changes in the oil samples' functional group to assess the physical changes. This equation has been tested and verified. This equation can be used to estimate the BDV of the palm based insulation oils as their percentage moisture increases. © 1994-2012 IEEE.


Samuel M.E.,Nigerian National Agency for Science and Engineering Infrastructure | Ikechukwu O.P.,Nigerian National Agency for Science and Engineering Infrastructure | Chibueze I.H.,Nnamdi Azikiwe University | Chinedu O.K.,Federal University of Technology Owerri | Genevra E.C.,Nigerian National Agency for Science and Engineering Infrastructure
IEEE International Conference on Adaptive Science and Technology, ICAST | Year: 2015

This paper seeks to establish the need to develop a model for reliability performance evaluation of power distribution companies in Nigeria. In this regard, an ICT based framework for the evaluation is proposed, while the challenges that are likely to militate against the implementation of the proposed framework were highlighted with their proffered solutions. In this paper, Enugu Electricity Distribution Company was used as a case study to show that the proposed Independent Data Acquisition Center (IDAC) model will work provided the field data namely System Average Interruption Duration Index (SAIDI) and System Average Interruption Frequency Index (SAIFI) are made available. The Independent Data Acquisition Center was simulated using vb.net leveraging on IEEE standard 1366-2012. Finally, this research is on-going with a focus on the development of an effective data capturing system for SAIDI and SAD7I. When fully integrated, the entire system would be of great help to individuals, respective companies and government domains for quick objective evaluation of the power distribution reliability in Nigeria. © 2014 IEEE.


Suleiman A.A.,Nigerian National Agency for Science and Engineering Infrastructure | Suleiman A.A.,University of Technology Malaysia | Muhamad N.A.,University of Technology Malaysia
International Review on Modelling and Simulations | Year: 2011

The dielectric properties of insulation oil in power transformers are dependent on the chemical structure of the oil. Although mineral oil based insulation oil is the common liquid dielectric used in power transformers, environmental and safety issues are pressurizing many stakeholders from developed countries to consider alternative fluid as transformer fluids. Vegetable (natural ester) based insulation oil is a viable alternative that has been commercialized in some countries. This paper presents results from the study done to ascertain the feasibility of using commercially available biodegradable insulation oil (Envirotemp® FR3™) for Malaysia power transformers. It was found that the tested oil failed to meet some of the standard insulating property values as stipulated in the Malaysian Standard (MS 2322:2010) and this was because the MS 2322:2010 is the standard for "Fluid for electrotechnical application-Unused mineral insulating oils for transformers and switchgear" which cannot be applied to Vegetable based insulation oil. This can lead to a misleading conclusion on the characteristics of natural ester oil as a substitute to mineral oil in power transformers. It is therefore pertinent to have a Malaysian standard property values for vegetable oil (natural esters) guiding researcher, manufacturer and users of "vegetable oil (natural ester) filled transformer in Malaysia". © 2011 Praise Worthy Prize S.r.l. - All rights reserved.


Ibrahim O.,University Of Ilorin | Amuda S.A.Y.,University Of Ilorin | Mohammed O.O.,University Of Ilorin | Kareem G.A.,Nigerian National Agency for Science and Engineering Infrastructure
International Journal of Electrical and Computer Engineering | Year: 2015

Accurate tuning of controller in industrial process operation is prerequisite to system smooth operation which directly reduce process variability, improved efficiency, reduced energy costs, and increased production rates. Performance evaluation of a model based PID controller tuning algorithm on a chemical process plant is presented in this paper. The control action of three different PID controller tuning algorithms namely; Hagglund-Astrom, Cohen and Coon, and Ziegler-Nichols on the process plant was examined in a closed loop control configuration under normal operating condition and in the face of disturbance. LabVIEW software was used to model a chemical process plant from open loop control test data. The time domain response analysis of the controllers shows that each tuning algorithm exhibit different time response. Ziegler-Nichols algorithm shows the best performance with fastest rise time, settling time and was able to restore the system back to normal operating condition in a short time when subjected to disturbance compare to Cohen & Coon controller and Hagglund-Astrom algorithm settings. © 2015 Institute of Advanced Engineering and Science. All rights reserved.


Olasupo O.A.,Nigerian National Agency for Science and Engineering Infrastructure | Borode J.O.,Federal University of Technology Akurre
Refractories and Industrial Ceramics | Year: 2012

The effect of sintering temperature on the properties of aluminosilicate ramming mass was investigated. Two refractory compositions, namely clay - silica - mica - bentonite (80 - 10 - 20 - 4) and clay - silica - mica - Durax (80 - 10 - 20 - 4), were investigated. Each of these compositions was thoroughly mixed in a laboratory sand mixer using 5% tempering water. Moulded samples of ∅50 mm x 50 mm height were then prepared from them using the AFS standard ramming machine. The samples were dried at 120°C for 110 min. These samples were fired at different temperatures of 1000, 1100, 1200, 1300, 1400, and 1500°C. The fired samples were thereafter tested for such properties as apparent porosity, cold compression strength, linear shrinkage, volumetric firing shrinkage, thermal shock resistance, and refractoriness at these temperatures. The results obtained indicated that the rise in cold compression strength for all samples with increasing temperature reaches a maximum before failure at the refractoriness point of 1500°C. The apparent porosity and volumetric shrinkage decrease with increasing temperature. At all temperature ranges, the materials exhibit excellent thermal shock resistance. These compositions are therefore recommended for lining of rotary furnaces for melting of cast iron. © 2012 Springer Science+Business Media, Inc.


Oyeniran K.,Nigerian National Agency for Science and Engineering Infrastructure | Haruna M.S.,Nigerian National Agency for Science and Engineering Infrastructure | Dauda M.,Nigerian National Agency for Science and Engineering Infrastructure | Aloko M.D.,Nigerian National Agency for Science and Engineering Infrastructure
Proceedings of the 11th International Conference on Electronics, Computer and Computation, ICECCO 2014 | Year: 2014

The opportunity to transform relationships between clients and businesses with all levels of government through electronics channels (ICTs) is paramount to future economic growth and stability of any nation. To enable internal efficiency in Government, there is need to promote ICT in Governance by facilitating e-Government, which enhances transparency, efficiency, productivity and citizen engagement. Information and Communication Technologies (ICTs) have changed the process of governance in the world. To manage government affairs for the benefits of Nigerian citizens, governments at various levels have adopted e-government technologies in service delivery. An effective Identity Management (IdM) program is a very important vehicle inthe acceleration of e-government in sustaining Millennium Development Goals (MDGs) for Economy development must not be left out. There is also a growing need to authenticate identity -access rights to systems in the e-government framework. © 2014 IEEE.

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