muncho mbunwe - Academia.edu (original) (raw)
Papers by muncho mbunwe
Bangladesh Journal of Scientific and Industrial Research
The study assessed manufacturing system optimization using computer-based control kanban loops. T... more The study assessed manufacturing system optimization using computer-based control kanban loops. The study assessed JIT's effect on average throughput-time, demand fill rate, net operating income for a certain product mix complexity and manufacturing overhead level. ARENA/SIMAN and WITNESS simulation tools were used to study implementation. The Drug Process Plant's JIT system reduced end buffer inventory, shortened customer lead time, and improved visual control. The mean response of the simulated new physical system in terms of NOI was 85.54 but gave a mean response of 85.30 when implemented on the shop floor. The mean response of the simulated new physical system in terms of cycle time was 617 but gave a mean response of 634 when implemented on the shop floor. Simulated new physical system in terms of DFR gave a mean response of 93.11 when implemented on the shop floor. Overwhelmingly, the new JIT system outperformed the old physical system. Bangladesh J. Sci. Ind. Res. 57(...
Transactions on Engineering Technologies, 2018
The provision of reliable electricity supply in both developed and developing nation is one of th... more The provision of reliable electricity supply in both developed and developing nation is one of the primary needs for socio economic development of that nation. This paper turn’s to solve by way of introducing indigenous technology hybrid solar/Wind/Diesel Power system that will harness the natural renewable energies from the Sun and Wind to generate electricity. Renewable energy resources are a favourable alternative for rural energy supply. In order to handle the fluctuating nature, hybrid systems can be applied. The 2007–2016, 9 years solar radiation data, and the 2007–2016 data for wind speed for Potiskum in Yobe State of Nigeria, were collected. The two parameter Wielbull distribution was used to simulate power in watts per meter square densities for the 9 years period. Load estimates of a typical rural community and for rural ICT infrastructures were estimated. The step by step design of a 15 kW solar power supply system and a 10 kW wind power was done as a sample case. The res...
With the ever-increasing complexity of disturbed Power Systems, the method of protection using el... more With the ever-increasing complexity of disturbed Power Systems, the method of protection using electromagnetic relays may not be adequate to afford appropriate discrimination especially when the fault current flows in parallel paths. Because the electromagnetic relay has slow response time, and the fact that it is a mechanical device and has moving parts, over a period of time, these moving parts will wear out and the relay will fail. To overcome these drawbacks, a more reliable means of system protection was carried out using solid-state contactless devices. A modular technique using five blocks made up of power supply unit, current sensor unit, voltage sensor unit, switching unit and output unit were used in the study design. A 66 kV power network was used to test the reliability of the protection designed circuit. Result shows enhanced system security.
Transactions on Engineering Technologies, 2018
The inability of power system to maintain a proper balance of reactive power is the major cause o... more The inability of power system to maintain a proper balance of reactive power is the major cause of voltage collapse. A system can be saved from voltage collapse by reducing the reactive power load or by adding additional reactive power into the system. The electric power system is afflicted with continuous load shedding due to inadequate generation and transmission capacities. To maximize the amount of real power that can be transferred over a network, reactive power flow must be minimized. Thus, sufficient reactive power should be provided locally in the system to keep bus voltages within stipulated ranges to satisfy customers’ equipment ratings. This paper presents an overview in reactive power compensation skills which remains as research challenges in this area. Newton-Raphson’s solution method was used to carry out the analysis because of its fast convergence, sparsity, and simplicity attributes when compared to other solution methods, with relevant data obtained from Power Hol...
2020 IEEE PES/IAS PowerAfrica, 2020
A stand-alone roof-top solar-PV power supply is a viable and cost effective alternative to expens... more A stand-alone roof-top solar-PV power supply is a viable and cost effective alternative to expensive and unreliable grid electricity to improve the quality of life by rural dwellers. This paper aims at highlighting the techno economic benefit of a stand-alone solar system as a viable option for production of electricity in South Eastern Nigeria. Emii is a village situated South Eastern Nigeria at Latitude 5.4511° N and longitude 7.1003° E and at an altitude of 106m. PVsyst software was used to carry out the economic analysis and it was found that the cost of energy of the stand-alone system was better than the unreliable grid supply having 0.098 /kWhand0.114/kWh and 0.114/kWhand0.114/kWh respectively. The Performance ration obtained from the sample was 0.653 and the solar fraction for the system is 98%. 30.802 tons of carbon emission was saved making the environment friendlier for inhabitants and payback period of 3.1years
Electricity generation in Nigeria is based on thermal and hydro generation, and is largely domina... more Electricity generation in Nigeria is based on thermal and hydro generation, and is largely dominated by two sources - non-renewable thermal (natural gas and coal) and renewable water or hydro. Coal and natural gas make up the largest portion of energy production in Nigeria. The fact that a reliable power station is one which would supply the required power within its installed capacity at any time within the specified voltage and frequency limits remains vital to our economic growth, personal well-being. Essential for this evaluation are the station’s installed capacity and available generation. As the gap between supply and demand on electric energy amplifies in Nigeria, it becomes necessary to carry out the optimal reliability performance of renewable energy powered turbine generators that control the electric power industry in Nigeria. The work focuses on the past data for performance of some power stations in Nigeria from 2006 to 2017 to determine their reliability and availabil...
Due to the benefit of the vital nature of electric power, both to our economic, personal well-bei... more Due to the benefit of the vital nature of electric power, both to our economic, personal well-being and other purposes, a power system is expected to supply electrical energy as economical as possible and with a high degree of quality and reliability. A reliable power station is one which would supply the required power within its installed capacity at any time within the specified voltage and frequency limits. Essential for this evaluation are the station's installed capacity and available generation. This work is to assess the past data for performance of some power stations in Nigeria from 2006 to 2017 to determine if they are supplying electric energy within their installed capacities in line with energy global best practices. The combined installed capacity of these power plant is 37% of the twenty-one thermal power plants connected to the national power grid. A historical operational data of these selected plants over a period of twelve years was obtained and evaluated bas...
International Journal of Analysis and Applications, 2020
Energy, which is required to run space satellites, is as old as space technology itself. The loca... more Energy, which is required to run space satellites, is as old as space technology itself. The location of these satellites has made it more applicable for unconventional means of energy generation to run them. The Sun being the universal and greatest source of all forms of energy, as well as the closest energy source to space satellites, has been so appropriately trapped using solar cells. Solar power satellites are designed to capture solar energy and transmit that energy to receiving stations using wireless power transmission mechanism. This paper is written to rehearse the immediate and associated usefulness of solar energy trapped from space as an alternative for electricity generation for the future; it is also an attempt to appraise the prospects of this scientific conviviality.
International Journal of Electrical and Electronics Engineering, 2019
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
A robust high-speed sliding mode control (SMC) of three phase permanent magnet synchronous motor ... more A robust high-speed sliding mode control (SMC) of three phase permanent magnet synchronous motor (PMSM) is presented. The SMC served for inner speed control while a simplified hysteresis current control (HCC) scheme was used in the outer current control to generate gating signals for the inverter switches. The present research leverages on the ability of SMC to directly access system speed error which it attempts driving to zero by cancelling modelling uncertainties and disturbances. Performance comparison was done for the SMC model and an existing model having classical PI controller. With the initial positive speed command of 200 rpm at 5 Nm constant loading, rotor speed with SMC neatly settled to the reference speed at 0.085 seconds without overshoot while the rotor speed of the model with PI controller settled at 0.217 seconds after overshoot. This translates to 155.3% speed enhancement. Similar superior speed performance of the SMC was also observed during recovering from sudde...
Analele Universităţii "Eftimie Murgu" Reşiţa: Fascicola I, Inginerie, 2018
Image processing is one of the methods of analyzing and obtaining new information. Image processi... more Image processing is one of the methods of analyzing and obtaining new information. Image processing methods can be applied to any image. Image processing is used in various fields of research. Among the stages of image processing, the stage of image pre-processing is important. This stage allows increasing the efficiency of the analysis of the original image. We considered the use of pre-processing for the analysis of natural polymer composites image. In this paper, we describe the possibilities of automatic processing of natural polymer composites image.
Multidisciplinary Journal for Education, Social and Technological Sciences, 2021
An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types ... more An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types and arcing phenomenon of Oil and SF6 Circuit breakers were briefly discussed. However, various CBs were analyzed in terms of certain outage frequencies and reliability indices to ascertain the most reliable CB. This was possible using data collected from the 33kV Transmission Company of Nigeria (TCN) New Haven, Enugu. After the analysis, Emene Industrial CB had the highest value of availability of 0.9999 and the lowest tripping report while Ezillo had the highest failure rate of 0.1032.
Nigerian Journal of Technology, 2020
The paper addresses the means of overcoming the challenge posed by voltage collapse to the stabil... more The paper addresses the means of overcoming the challenge posed by voltage collapse to the stability of the Nigerian electric power system. The technique applied is based on time identification algorithm elaborating, at a given grid bus, the local phasor measurements at fast sampling rate. Elements such as adjustable shunt compensation devices, generator reactive generation, transformer tap settings are optimally adjusted at each operating point to reach the objective of minimizing the voltage stability index at each individual bus as well as minimizing the global voltage stability indicator. The control elements setting were optimized and the maximum possible MVA voltage stable loading has been achieved and a best voltage profile was obtained. Results of tests conducted on a 6-bus IEEE system and a typical 28-bus Nigerian power distribution network are presented and discussed. Keywords: Special protection systems, voltage stability analysis, voltage stability limit, voltage collaps...
The amount of power produced by a photovoltaic (PV) or solar panel depends on the amount of sunli... more The amount of power produced by a photovoltaic (PV) or solar panel depends on the amount of sunlight to which it is exposed. As the sun’s position changes throughout the day, the PV panel must be adjusted so that it is always aimed directly at the sun and, as a result, produces the maximum possible power. A sun-tracking system tracks the motion of the sun across the sky and moves the PV panel to face directly at the sun and thereby ensuring that maximum amount of sunlight strikes the panel throughout the day. Sun-tracked PV systems are more efficient than fixed PV systems and are capable of enhancing productivity. In this paper different types of sun-tracking systems are reviewed and their energy gains are discussed.
Transactions on Engineering Technologies
The aim of this research work is based on the design and development of a motorized yam pounder f... more The aim of this research work is based on the design and development of a motorized yam pounder for pounding yam, this research was considered because of the importance of pounded yam in Africa particularly in Nigeria and because of the time and energy wasted using the traditional mortar and pestle method of yam pounding. The research work aimed at eliminating the labour involved in traditional method of pounding. Through this improvement the possibility of food contamination by sweating while pounding will be control. This project work sought to design a yam pounder that pounds yam right from the peeled cooked stage in a pounding bowl with the help of an electric motor that transmits power through rotary motion together with the help of shaft. The pounding blades functions as the pestle. The machine is to be operated by electricity and it consists of shaft, electric motor, yam beaters or pounding blades, bowl and the frame. Low cost materials were used so as to make the machine affordable for average Nigerian homes, thereby improving the standard of living. In order to avoid food contamination stainless material were also incorporated for smooth and clean pounding before consumption.
Journal of Physics: Conference Series
The principle of a three phase solid state VAR compensation (SSVC) system that uses a three-phase... more The principle of a three phase solid state VAR compensation (SSVC) system that uses a three-phase pulse width-modulated (PWM) Voltage-Source Inverter (VSI) is presented and analyzed. The proposed SSVC system can compensate for leading and lagging displacement power factor and the PWM is used as a means of reducing the size of reactive components. The significant aspect of the presented VAR compensator is the adjustment of the angle difference between the static fundamental circuit output voltage and the utility supply voltage in order to optimize the alternating current (a.c.) power factor to a non-linear load. The SSVC system is analyzed under self-controlled DC bus voltage operating conditions. Other areas of investigation include the design of SSVC reactive components. The dynamic analysis is carried out in a d-q reference frame to verify the performance of the VAR compensator in terms of speed of response and stability. Analysis and stability plots generated confirm a high perfo...
Overcurrent relays (OCRs) are one of the most common protective devices implemented in power syst... more Overcurrent relays (OCRs) are one of the most common protective devices implemented in power systems to protect electrical components from faults. In order to obtain much improved protection by these protective devices, a precise coordination of these systems must be applied. One of the problems in power systems, which is very common, is when a fault occurs in a plant, and two, three or even several OCRs operate instead of the designated relay at that particular fault location. In this work, the technical data of 2X15MVA, 33/11KV Maitama injection substation was collected and used for modelling relay coordination for the station. After the coordination, the result shows that 33KV feeder will trip on over current and earth faults if the secondary current of the CT exceeds 1.32A and 0.264A within 0.021s and 0.00167 respectively. For the 11KV outgoing feeder, it will trip on over current and earth faults if the secondary current of the CT exceeds 0.88A and 264mA within 12.5ms and 1.7ms...
Multidisciplinary Journal for Education, Social and Technological Sciences,, 2021
An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types ... more An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types and arcing phenomenon of Oil and SF6 Circuit breakers were briefly discussed. However, various CBs were analyzed in terms of certain outage frequencies and reliability indices to ascertain the most reliable CB. This was possible using data collected from the 33kV Transmission Company of Nigeria (TCN) New Haven, Enugu. After the analysis, Emene Industrial CB had the highest value of availability of 0.9999 and the lowest tripping report while Ezillo had the highest failure rate of 0.1032.
Journal of Mathematical and Computational Science
Electrical service design is an important aspect of modern building constructions. The purpose of... more Electrical service design is an important aspect of modern building constructions. The purpose of this paper is to give a convenient and economical approach to electrical service design in order to save energy. This paper designed and analyzed the internal electrical services of a duplex that included the lighting, generator power source and inverter sizing design which has been absent in most designs. The design parameters were modeled to meet the economic standards; hence specific values were given to different equipment. The result of the whole analysis and design was depicted in an AutoCAD format and it is seen that the design resulted in lesser energy consumption as compared to previous research. Though internal electrical services design might be a tedious process, but with this approach the process was made less demanding and easy. The work described is of tutorial significance.
Journal of Mathematical and Computational Science, 2020
Electrical service design is an important aspect of modern building constructions. The purpose of... more Electrical service design is an important aspect of modern building constructions. The purpose of this paper is to give a convenient and economical approach to electrical service design in order to save energy. This paper designed and analyzed the internal electrical services of a duplex that included the lighting, generator power source and inverter sizing design which has been absent in most designs. The design parameters were modeled to meet the economic standards; hence specific values were given to different equipment. The result of the whole analysis and design was depicted in an AutoCAD format and it is seen that the design resulted in lesser energy consumption as compared to previous research. Though internal electrical services design might be a tedious process, but with this approach the process was made less demanding and easy. The work described is of tutorial significance.
Bangladesh Journal of Scientific and Industrial Research
The study assessed manufacturing system optimization using computer-based control kanban loops. T... more The study assessed manufacturing system optimization using computer-based control kanban loops. The study assessed JIT's effect on average throughput-time, demand fill rate, net operating income for a certain product mix complexity and manufacturing overhead level. ARENA/SIMAN and WITNESS simulation tools were used to study implementation. The Drug Process Plant's JIT system reduced end buffer inventory, shortened customer lead time, and improved visual control. The mean response of the simulated new physical system in terms of NOI was 85.54 but gave a mean response of 85.30 when implemented on the shop floor. The mean response of the simulated new physical system in terms of cycle time was 617 but gave a mean response of 634 when implemented on the shop floor. Simulated new physical system in terms of DFR gave a mean response of 93.11 when implemented on the shop floor. Overwhelmingly, the new JIT system outperformed the old physical system. Bangladesh J. Sci. Ind. Res. 57(...
Transactions on Engineering Technologies, 2018
The provision of reliable electricity supply in both developed and developing nation is one of th... more The provision of reliable electricity supply in both developed and developing nation is one of the primary needs for socio economic development of that nation. This paper turn’s to solve by way of introducing indigenous technology hybrid solar/Wind/Diesel Power system that will harness the natural renewable energies from the Sun and Wind to generate electricity. Renewable energy resources are a favourable alternative for rural energy supply. In order to handle the fluctuating nature, hybrid systems can be applied. The 2007–2016, 9 years solar radiation data, and the 2007–2016 data for wind speed for Potiskum in Yobe State of Nigeria, were collected. The two parameter Wielbull distribution was used to simulate power in watts per meter square densities for the 9 years period. Load estimates of a typical rural community and for rural ICT infrastructures were estimated. The step by step design of a 15 kW solar power supply system and a 10 kW wind power was done as a sample case. The res...
With the ever-increasing complexity of disturbed Power Systems, the method of protection using el... more With the ever-increasing complexity of disturbed Power Systems, the method of protection using electromagnetic relays may not be adequate to afford appropriate discrimination especially when the fault current flows in parallel paths. Because the electromagnetic relay has slow response time, and the fact that it is a mechanical device and has moving parts, over a period of time, these moving parts will wear out and the relay will fail. To overcome these drawbacks, a more reliable means of system protection was carried out using solid-state contactless devices. A modular technique using five blocks made up of power supply unit, current sensor unit, voltage sensor unit, switching unit and output unit were used in the study design. A 66 kV power network was used to test the reliability of the protection designed circuit. Result shows enhanced system security.
Transactions on Engineering Technologies, 2018
The inability of power system to maintain a proper balance of reactive power is the major cause o... more The inability of power system to maintain a proper balance of reactive power is the major cause of voltage collapse. A system can be saved from voltage collapse by reducing the reactive power load or by adding additional reactive power into the system. The electric power system is afflicted with continuous load shedding due to inadequate generation and transmission capacities. To maximize the amount of real power that can be transferred over a network, reactive power flow must be minimized. Thus, sufficient reactive power should be provided locally in the system to keep bus voltages within stipulated ranges to satisfy customers’ equipment ratings. This paper presents an overview in reactive power compensation skills which remains as research challenges in this area. Newton-Raphson’s solution method was used to carry out the analysis because of its fast convergence, sparsity, and simplicity attributes when compared to other solution methods, with relevant data obtained from Power Hol...
2020 IEEE PES/IAS PowerAfrica, 2020
A stand-alone roof-top solar-PV power supply is a viable and cost effective alternative to expens... more A stand-alone roof-top solar-PV power supply is a viable and cost effective alternative to expensive and unreliable grid electricity to improve the quality of life by rural dwellers. This paper aims at highlighting the techno economic benefit of a stand-alone solar system as a viable option for production of electricity in South Eastern Nigeria. Emii is a village situated South Eastern Nigeria at Latitude 5.4511° N and longitude 7.1003° E and at an altitude of 106m. PVsyst software was used to carry out the economic analysis and it was found that the cost of energy of the stand-alone system was better than the unreliable grid supply having 0.098 /kWhand0.114/kWh and 0.114/kWhand0.114/kWh respectively. The Performance ration obtained from the sample was 0.653 and the solar fraction for the system is 98%. 30.802 tons of carbon emission was saved making the environment friendlier for inhabitants and payback period of 3.1years
Electricity generation in Nigeria is based on thermal and hydro generation, and is largely domina... more Electricity generation in Nigeria is based on thermal and hydro generation, and is largely dominated by two sources - non-renewable thermal (natural gas and coal) and renewable water or hydro. Coal and natural gas make up the largest portion of energy production in Nigeria. The fact that a reliable power station is one which would supply the required power within its installed capacity at any time within the specified voltage and frequency limits remains vital to our economic growth, personal well-being. Essential for this evaluation are the station’s installed capacity and available generation. As the gap between supply and demand on electric energy amplifies in Nigeria, it becomes necessary to carry out the optimal reliability performance of renewable energy powered turbine generators that control the electric power industry in Nigeria. The work focuses on the past data for performance of some power stations in Nigeria from 2006 to 2017 to determine their reliability and availabil...
Due to the benefit of the vital nature of electric power, both to our economic, personal well-bei... more Due to the benefit of the vital nature of electric power, both to our economic, personal well-being and other purposes, a power system is expected to supply electrical energy as economical as possible and with a high degree of quality and reliability. A reliable power station is one which would supply the required power within its installed capacity at any time within the specified voltage and frequency limits. Essential for this evaluation are the station's installed capacity and available generation. This work is to assess the past data for performance of some power stations in Nigeria from 2006 to 2017 to determine if they are supplying electric energy within their installed capacities in line with energy global best practices. The combined installed capacity of these power plant is 37% of the twenty-one thermal power plants connected to the national power grid. A historical operational data of these selected plants over a period of twelve years was obtained and evaluated bas...
International Journal of Analysis and Applications, 2020
Energy, which is required to run space satellites, is as old as space technology itself. The loca... more Energy, which is required to run space satellites, is as old as space technology itself. The location of these satellites has made it more applicable for unconventional means of energy generation to run them. The Sun being the universal and greatest source of all forms of energy, as well as the closest energy source to space satellites, has been so appropriately trapped using solar cells. Solar power satellites are designed to capture solar energy and transmit that energy to receiving stations using wireless power transmission mechanism. This paper is written to rehearse the immediate and associated usefulness of solar energy trapped from space as an alternative for electricity generation for the future; it is also an attempt to appraise the prospects of this scientific conviviality.
International Journal of Electrical and Electronics Engineering, 2019
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
A robust high-speed sliding mode control (SMC) of three phase permanent magnet synchronous motor ... more A robust high-speed sliding mode control (SMC) of three phase permanent magnet synchronous motor (PMSM) is presented. The SMC served for inner speed control while a simplified hysteresis current control (HCC) scheme was used in the outer current control to generate gating signals for the inverter switches. The present research leverages on the ability of SMC to directly access system speed error which it attempts driving to zero by cancelling modelling uncertainties and disturbances. Performance comparison was done for the SMC model and an existing model having classical PI controller. With the initial positive speed command of 200 rpm at 5 Nm constant loading, rotor speed with SMC neatly settled to the reference speed at 0.085 seconds without overshoot while the rotor speed of the model with PI controller settled at 0.217 seconds after overshoot. This translates to 155.3% speed enhancement. Similar superior speed performance of the SMC was also observed during recovering from sudde...
Analele Universităţii "Eftimie Murgu" Reşiţa: Fascicola I, Inginerie, 2018
Image processing is one of the methods of analyzing and obtaining new information. Image processi... more Image processing is one of the methods of analyzing and obtaining new information. Image processing methods can be applied to any image. Image processing is used in various fields of research. Among the stages of image processing, the stage of image pre-processing is important. This stage allows increasing the efficiency of the analysis of the original image. We considered the use of pre-processing for the analysis of natural polymer composites image. In this paper, we describe the possibilities of automatic processing of natural polymer composites image.
Multidisciplinary Journal for Education, Social and Technological Sciences, 2021
An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types ... more An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types and arcing phenomenon of Oil and SF6 Circuit breakers were briefly discussed. However, various CBs were analyzed in terms of certain outage frequencies and reliability indices to ascertain the most reliable CB. This was possible using data collected from the 33kV Transmission Company of Nigeria (TCN) New Haven, Enugu. After the analysis, Emene Industrial CB had the highest value of availability of 0.9999 and the lowest tripping report while Ezillo had the highest failure rate of 0.1032.
Nigerian Journal of Technology, 2020
The paper addresses the means of overcoming the challenge posed by voltage collapse to the stabil... more The paper addresses the means of overcoming the challenge posed by voltage collapse to the stability of the Nigerian electric power system. The technique applied is based on time identification algorithm elaborating, at a given grid bus, the local phasor measurements at fast sampling rate. Elements such as adjustable shunt compensation devices, generator reactive generation, transformer tap settings are optimally adjusted at each operating point to reach the objective of minimizing the voltage stability index at each individual bus as well as minimizing the global voltage stability indicator. The control elements setting were optimized and the maximum possible MVA voltage stable loading has been achieved and a best voltage profile was obtained. Results of tests conducted on a 6-bus IEEE system and a typical 28-bus Nigerian power distribution network are presented and discussed. Keywords: Special protection systems, voltage stability analysis, voltage stability limit, voltage collaps...
The amount of power produced by a photovoltaic (PV) or solar panel depends on the amount of sunli... more The amount of power produced by a photovoltaic (PV) or solar panel depends on the amount of sunlight to which it is exposed. As the sun’s position changes throughout the day, the PV panel must be adjusted so that it is always aimed directly at the sun and, as a result, produces the maximum possible power. A sun-tracking system tracks the motion of the sun across the sky and moves the PV panel to face directly at the sun and thereby ensuring that maximum amount of sunlight strikes the panel throughout the day. Sun-tracked PV systems are more efficient than fixed PV systems and are capable of enhancing productivity. In this paper different types of sun-tracking systems are reviewed and their energy gains are discussed.
Transactions on Engineering Technologies
The aim of this research work is based on the design and development of a motorized yam pounder f... more The aim of this research work is based on the design and development of a motorized yam pounder for pounding yam, this research was considered because of the importance of pounded yam in Africa particularly in Nigeria and because of the time and energy wasted using the traditional mortar and pestle method of yam pounding. The research work aimed at eliminating the labour involved in traditional method of pounding. Through this improvement the possibility of food contamination by sweating while pounding will be control. This project work sought to design a yam pounder that pounds yam right from the peeled cooked stage in a pounding bowl with the help of an electric motor that transmits power through rotary motion together with the help of shaft. The pounding blades functions as the pestle. The machine is to be operated by electricity and it consists of shaft, electric motor, yam beaters or pounding blades, bowl and the frame. Low cost materials were used so as to make the machine affordable for average Nigerian homes, thereby improving the standard of living. In order to avoid food contamination stainless material were also incorporated for smooth and clean pounding before consumption.
Journal of Physics: Conference Series
The principle of a three phase solid state VAR compensation (SSVC) system that uses a three-phase... more The principle of a three phase solid state VAR compensation (SSVC) system that uses a three-phase pulse width-modulated (PWM) Voltage-Source Inverter (VSI) is presented and analyzed. The proposed SSVC system can compensate for leading and lagging displacement power factor and the PWM is used as a means of reducing the size of reactive components. The significant aspect of the presented VAR compensator is the adjustment of the angle difference between the static fundamental circuit output voltage and the utility supply voltage in order to optimize the alternating current (a.c.) power factor to a non-linear load. The SSVC system is analyzed under self-controlled DC bus voltage operating conditions. Other areas of investigation include the design of SSVC reactive components. The dynamic analysis is carried out in a d-q reference frame to verify the performance of the VAR compensator in terms of speed of response and stability. Analysis and stability plots generated confirm a high perfo...
Overcurrent relays (OCRs) are one of the most common protective devices implemented in power syst... more Overcurrent relays (OCRs) are one of the most common protective devices implemented in power systems to protect electrical components from faults. In order to obtain much improved protection by these protective devices, a precise coordination of these systems must be applied. One of the problems in power systems, which is very common, is when a fault occurs in a plant, and two, three or even several OCRs operate instead of the designated relay at that particular fault location. In this work, the technical data of 2X15MVA, 33/11KV Maitama injection substation was collected and used for modelling relay coordination for the station. After the coordination, the result shows that 33KV feeder will trip on over current and earth faults if the secondary current of the CT exceeds 1.32A and 0.264A within 0.021s and 0.00167 respectively. For the 11KV outgoing feeder, it will trip on over current and earth faults if the secondary current of the CT exceeds 0.88A and 264mA within 12.5ms and 1.7ms...
Multidisciplinary Journal for Education, Social and Technological Sciences,, 2021
An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types ... more An attempt has been made for the analysis on Circuit breakers (CBs) this paper. First, the types and arcing phenomenon of Oil and SF6 Circuit breakers were briefly discussed. However, various CBs were analyzed in terms of certain outage frequencies and reliability indices to ascertain the most reliable CB. This was possible using data collected from the 33kV Transmission Company of Nigeria (TCN) New Haven, Enugu. After the analysis, Emene Industrial CB had the highest value of availability of 0.9999 and the lowest tripping report while Ezillo had the highest failure rate of 0.1032.
Journal of Mathematical and Computational Science
Electrical service design is an important aspect of modern building constructions. The purpose of... more Electrical service design is an important aspect of modern building constructions. The purpose of this paper is to give a convenient and economical approach to electrical service design in order to save energy. This paper designed and analyzed the internal electrical services of a duplex that included the lighting, generator power source and inverter sizing design which has been absent in most designs. The design parameters were modeled to meet the economic standards; hence specific values were given to different equipment. The result of the whole analysis and design was depicted in an AutoCAD format and it is seen that the design resulted in lesser energy consumption as compared to previous research. Though internal electrical services design might be a tedious process, but with this approach the process was made less demanding and easy. The work described is of tutorial significance.
Journal of Mathematical and Computational Science, 2020
Electrical service design is an important aspect of modern building constructions. The purpose of... more Electrical service design is an important aspect of modern building constructions. The purpose of this paper is to give a convenient and economical approach to electrical service design in order to save energy. This paper designed and analyzed the internal electrical services of a duplex that included the lighting, generator power source and inverter sizing design which has been absent in most designs. The design parameters were modeled to meet the economic standards; hence specific values were given to different equipment. The result of the whole analysis and design was depicted in an AutoCAD format and it is seen that the design resulted in lesser energy consumption as compared to previous research. Though internal electrical services design might be a tedious process, but with this approach the process was made less demanding and easy. The work described is of tutorial significance.