ASSESSMENT OF SYSTEMS RELIABILITY PERFORMANCE OF PHCN
ABSTRACT
Today's economic climate requires that every industry aim at achieving maximum production capability while minimizing capital investment. This means finding ways to maximize equipment reliability and up-time as well as extend plant and equipment life.
This project focuses on the assessment of systems reliability performance of Power Holding Company of Nigeria (PHCN) with Diobu Distribution network (Port Harcourt) as our case study, using daily fault data for three years, viz; 2006, 2007 and 2008. The Poisson distribution and the chi-square were used to determine the appropriateness of the observed data collected.
The chi-square was used to assess the goodness of fit of the Poisson distribution hypothesis at 0.05 level of significance. The project work estimate the reliability indices of failure rate (ï¬), system reliability R(t), failure density function F(t) and system interruption frequency index.
CHAPTER ONE
1.0 Introduction
Distribution networks differ from transmission networks in quite a number of ways, ranging from voltage magnitude to the number of branches and sources. The number of branches and sources is much higher in distribution networks and the voltage magnitude lower. Its general structure of make up is quite different from that of the transmission networks.
A typical distribution system consist of step down transformer e.g. 132/11kv, at a bulk supply point feeding a number of cables. A series of step-down three phase transformers, e.g. 11kv/415v, are spaced in route and from these, the consumers are supplies three phase, four wire networks which give 240 single phase to house and other similar loads.
Also, large scale or industrial consumers could be supplied at 33kv or 11kv.
The objective of power system company is to maintain a continuous and adequate power supply to its consumers at a reasonable rate of return. In Nigeria, this objective is far from being met. Hence, there is the need to focus our attention on reliability as a way of assessing and improving the power system as well as optimizing our investment in the distribution network.
Reliability studies are performed to maximize the reliability, efficiency and safety of an electric power system.
It has been observed that a major part of service interruptions experienced by consumers has its origin in failure from the distribution system (mostly 33kv and below in Nigeria, with radial arrangement), and the distribution system reliability studies have been hindered due to the unavailability of component outage on the distribution system.
Hence, the need to maintain a reliable and effective distribution system using the available equipment on the system is very important and necessary.
1.1 Significance of the Study
The significance or relevance of this study are as listed below:
- Improve efficiency.
- Increase operating reliability.
- Improve system maintainability.
- Reduce operating cost.
- Evaluate the impact of adding new equipment.
- Optimize system upgrades.
- Identify sources of failures.
1.2 Definition of Terms
1.2.1 Reliability, R(t):
This can be defined as the capability of an equipment or asset to continue to perform its intended function under specified condition for a stated period of time. It is normally measured as the mean time between failures (MTBF) for each system. Dunn, 2002).
1.2.2 Failure Rate:
This is the number of faults or failures per unit time. The symbol is ?.
1.2.3 Mean Time Before Failure (MTBF):
This is the mean value of the length of time that elapses between failures.
1.3 Causes of Faults
The causes of faults include the following:
- Lightning strike
- Heavy wind
- Trees falling across wires
- Failure of insulators
- Vehicle collision with electric poles
- Illegal connections/operation by consumers
- Vandalization.
CHAPTER TWO
2.0 Literature Review
2.1 Introduction
The review of relevant literature is the main topic of this chapter. A literature review covers theoretical and methodological contributions to a certain issue in addition to the state of knowledge at the time of writing. It provides information about the state of the art in relation to the subject you are writing about. It examines the body of work on the chosen subject. The literature evaluation in this study comprises the …
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TABLE OF CONTENTSPRELIMINARY PAGES
- Title page
- Approval page
- Dedication
- Acknowledgement
- Table of Contents
- Abstract
- 1.0 Introduction
- 1.1 Significance of the study
- 1.2 Definition of terms
- 1.2.1 Reliability
- 1.2.2 Failure Rate
- 1.2.3 Mean Time Before Failure
- 1.3 Causes of Failure
- Literature Review
- 3.0 Research Methodology
- 3.1 Sampling Techniques
- 3.2 Sources of Data
- 3.2.1 Primary Sources
- 3.2.2 Secondary Sources
- 3.3 Validation of Instrument
- 3.4 Techniques of Data Analysis
- Table 4.1: Monthly Peak Load and Number of Consumers.
- Table 4.2: Summary of Fault Data for 2006
- Table 4.3: Summary of Fault Data for 2007
- Table 4.4: Summary of Fault Data for 2008
- 4.1 Computation of Fault intervals
- 4.2 Computation of Mean
- 4.3 Computation of Variance
- Table 4.5: Values of F(x — x) Obtained for various Months
- 4.4 Computation of Expected Frequency
- 4.5 Computation of Chi-Square
- Table 4.6: Presentation of Fault Intervals, Observed Frequencies, Calculated/Expected frequencies, Mean, Variance and Calculated Chi-Square.
- 4.6 Computation of Reliability Indices in Operating Hours
- 4.6.1 Failure rate for Months in Hours
- 4.6.2 System Reliability of each Month
- 4.6.3 Failure Distribution Function for the System
- 4.6.4 Life Time Cumulative Distribution Function (CDF)
- 4.6.5 Life Time Probability Distribution Function (PDF)
- 4.6.6 System Interruption Frequency Index
- Table 4.8: Reliability indices
- 4.7 Discussion/Analysis of Result
- 5.0 Conclusion and Recommendation
- 5.1 Conclusion
- 5.2 Recommendation
REFERENCES
Disclaimer for Complete Material Utilization
The displayed research work titled "Assessment of Systems Reliability Performance of PHCN" is stated as a research guideline towards accomplishing your assigned project / seminar research work. All the research materials on this website are ONLY for research purposes and should be used as a guideline in developing your research work. For no reason should you copy word for word as projectlist.com.ng will not be liable for any who copied the material. By ordering the complete research guideline, it signifies that you've accepted our terms of service.
PRELIMINARY PAGES
- Title page
- Approval page
- Dedication
- Acknowledgement
- Table of Contents
- Abstract
- 1.0 Introduction
- 1.1 Significance of the study
- 1.2 Definition of terms
- 1.2.1 Reliability
- 1.2.2 Failure Rate
- 1.2.3 Mean Time Before Failure
- 1.3 Causes of Failure
- Literature Review
- 3.0 Research Methodology
- 3.1 Sampling Techniques
- 3.2 Sources of Data
- 3.2.1 Primary Sources
- 3.2.2 Secondary Sources
- 3.3 Validation of Instrument
- 3.4 Techniques of Data Analysis
- Table 4.1: Monthly Peak Load and Number of Consumers.
- Table 4.2: Summary of Fault Data for 2006
- Table 4.3: Summary of Fault Data for 2007
- Table 4.4: Summary of Fault Data for 2008
- 4.1 Computation of Fault intervals
- 4.2 Computation of Mean
- 4.3 Computation of Variance
- Table 4.5: Values of F(x — x) Obtained for various Months
- 4.4 Computation of Expected Frequency
- 4.5 Computation of Chi-Square
- Table 4.6: Presentation of Fault Intervals, Observed Frequencies, Calculated/Expected frequencies, Mean, Variance and Calculated Chi-Square.
- 4.6 Computation of Reliability Indices in Operating Hours
- 4.6.1 Failure rate for Months in Hours
- 4.6.2 System Reliability of each Month
- 4.6.3 Failure Distribution Function for the System
- 4.6.4 Life Time Cumulative Distribution Function (CDF)
- 4.6.5 Life Time Probability Distribution Function (PDF)
- 4.6.6 System Interruption Frequency Index
- Table 4.8: Reliability indices
- 4.7 Discussion/Analysis of Result
- 5.0 Conclusion and Recommendation
- 5.1 Conclusion
- 5.2 Recommendation
REFERENCES
Disclaimer for Complete Material Utilization
The displayed research work titled "Assessment of Systems Reliability Performance of PHCN" is stated as a research guideline towards accomplishing your assigned project / seminar research work. All the research materials on this website are ONLY for research purposes and should be used as a guideline in developing your research work. For no reason should you copy word for word as projectlist.com.ng will not be liable for any who copied the material. By ordering the complete research guideline, it signifies that you've accepted our terms of service.
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