Thesis 2011

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An Overview of DESCO’s Distribution, Operation, Maintenance and Customer Care
(East West University, 1/29/2012) Sayeed, Md. Sohab; Chowdhury, Abdullah Al Maymun
Electricity is the ultimate tool for modernization. It created it, sustains and will hence propel its borders past present limitations. Proper supply of electricity has a positive impact on GDP of a country. In Bangladesh, there is always a deficit of electricity production. At the moment, only 60% of our entire popUlations are getting electricity. People, who are getting electric lines, are also facing a great deal of load shedding. After the liberation war, every government tried to improve power sectors but the struggle with meeting the demands of the electrical consumption still persists. The most pressing problem in the power sector has been with the distribution system, which is characterized by heavy system loss and poor collection perfonnance. Dhaka Electric Supply Company Ltd. (DESCO) was created in 1996 under company Act 1994 as a public Limited company to improve better revenue collection and better consumer service.
Analysis of CNT – Si Heterojuction Solar Cells.
(East West University, 10/2/2011) Hasan, Md. Roqibul; Islam, Lasker Aminul
In this thesis heterojunction formation of carbon nanotube (CNT) with silicon (Si) is studied to design new kind of solar cells. The nanoscale structure, high mobility and high physical and electrical properties of CNT can be used to improve the efficiency of solar cell. Here we analyzed i-n (CNT in i-side and Si in n-side) heterojunction solar cells. By varying the diameter of carbon nanotube (CNT), the bandgap can be varied according to our desired value. Here we vary the diameter of CNT around I nm to check the characteristics of this solar cell. To form heterojunction of CNT with Si we assumed CNT as intrinsic and an equation has been developed to find the band diagram. We calculated the ShOlt circuit current density (Jsc) by using the data for terrestrial solar irradiance with Air Mass 1.5. Calculation has been made assuming solar cell is ideal. To calculate Fill Factor and Efficiency for different diameter of CNTs. we have calculated the total current density and the open circuit voltage. MA TLAB software has been used for calculation. P-V curve is also plotted to find the maximum power point and from that fill factor (FF) and efficiency (17) is calculated. In this paper we show different open circLlit voltage. short circuit current, fill factor and efficiency for different diameter of CNT. All the parameters decrease with the decrement of diameters of CNT. In oLir model the best efficiency is 22.663% for of 1.92nm diameter of CNT. We compared the efficiency variation for different diameters of CNT and proposed a range of CNT diameter to design the CNT-Si heterojunction solar cells, in which range efficiency remains stable and higher.
Ashuganj Power Station Company Ltd.
(East West University, 10/4/2011) Hossain, Md. Abed; Ahmed, Sheik Sakil; Kader, Mst. Sharmin
To fulfill the requirements of graduation in Electrical and Electronics Engineering at East West University we chose the industrial attachment interne. We successfully completed our internship on power production from the Ashuganj Power Station Company Ltd (APSCL). It is situated near Meghna River in Ashuganj. As our major is in power sector so we chose to go for interne in a power company where we can actually learn the practical knowledge of producing electricity and distribute it in an efficient way. On completion of this internship we gathered practical knowledge about production of electricity, major equipments e.g. Generator, Transformer and Switchgear equipments required for distribution and protection of the system. We learned about the operation of a power station and also the maintenance of it. We learned the responsibilities of being an Engineer and responding to it as efficiently as possible. A power station has lots of equipments connected in synchronized manner (where it is necessary) in order to produce power and distribute it. A power station can be divided into three basic sections. Backup and control section (it runs on DC power). • Generation section (it generates electrical energy and conditions it for grid supply). • Distribution and transmission section (known as substation and grid ). Our duration of stay was divided equally to work in this three major section. During the internee we have seen a plant getting tripped and the necessary actions that the engineers take in order to make it back to work in normal conditions. We have seen how a O'3llsformer is started and the conditions necessary for the transformer to start. We have seen the substation and understood the necessity of each and every equipments used there.
Ashuganj Power Station Company Ltd. (APSCL).
(East West University, 10/4/2011) Hasan, Mirza Rashid; Hassan, Md. Mahfuzul; Sharmin, Anika
We did our internship at Ashuganj Power Station Company Ltd (APSCL) located at 90 km North-East of Dhaka on the left bank of the river Meghna from 30th of April to 14th of May and this internship report is the result of those 15 days attachment with the APSCL During our internship period we gathered practical experiences over the topics related power generation,Swichgear protection and power distribution which we have learned inside the class room or from books. In this report we have focused on the processes which are used in APSCL For power generation, steam and gas turbine power plants are used in APSCL So we observed the process of power generation by steam and gas turbine power plant. During our internship period unit 1 and 4 of steam turbine power plant were under overhauling situation. So we had the opportunity to observe the inside part of the generator (rotor and stator) and turbine chamber which helped us to collect more knowledge about these topics. Protection and controlling of the equipments of the power station is a very important and complicated task. With the help of the plant engineers we observed the control room and protective equipments such as: relays (digital and electrical), circuit breakers etc very closely and understood the functions and controlling system of those equipment's .Substation is an important part of a power station to distribute power and protection purpose. We acquired knowledge about various types of transformers, bus-bars, circuit breakers (SF6 and Oil), lightning arresters, CT, PT and other equipments of the substation which were clearly taught and shown by the senior engineers of the substation of APSCL. There are various types of tests (megar test, motor test, transformer test) which are performed by the technicians and engineers of the APSCL With the help of the technicians we performed these tests successfully during our internship period.
Assimilation of Negative Feedback in Bandgap Reference Circuits for Subsiding the Variation of Reference Voltages Over the Temperature Range from 55 C to +165 C
(East West University, 1/22/2012) Uzzaman, Md. Rashed; Haque, Syed Ziaul; Abdullah-AI-Mamun
Latest technologies demand for low voltage and low power in designing both analog and digital integrated circuits. The purpose is to incorporate as much devices as possible into a single chip and to operate them in low voltage in order to minimize power loss. On the other hand, many electronic blocks such as oscillator, data converter (AID or Df A) etc. require a precise reference yoltage so as to work properly even when there is supply, process and temperature variations. A Bandgap reference circuit (BGR) plays a vital role, in this case, that provides a low reference yoltage that is exempt to temperature, process and supply variations. In this project, a 1.2V CMOS Bandgap reference circuit with supply voltage range of 1.8V to 2V in associated with active regulated circuits is proposed. The reference circuit is designed to operate at an ambient temperature of 27°C with line regulation of 177.5mVN and a temperature coefficient of 241 ppm/DC. The reference circuit composed of a supply independent block (which is basically a common-gate-Op Amp) that keeps the reference immune to supply variation to some extent. Another part of the reference circuit is the temperature independent block that is designed in such a way that the reference has negligible impact with temperature variation and also it debilitates the effect of process variation with temperature. An equation is derived for the clear understanding of how process variation is affecting the reference voltage. Lastly, the values obtained from the design simulation are compared with the other proposals. A two stage operational amplifier with a gain of around 70dB is designed to demonstrate the adverse effect of varying reference on its gain. Owing to its high open loop dc gain, the Op Amp shows a significant change due to small change in its biasing voltage. The gain of the Op Amp varies from 13%-15% due to variation in temperature and 60%-130% due to the variation in supply. So active regulated circuits are proposed that incorporate negative feedback mechanisms, in order, to subside the reference voltage to 1.2V, for a wide range of temperature from -55DC to +1650C. The analyses are carried out in Advanced Design System (ADS) software using TSMC 0.18wn technology.
Color Television Assembly in Shahnoor Electronics.
(East West University, 10/9/2011) Hossain, Mir Mosharraf
This report is about assembling of a color television. The parts are imported from China and the assembling section of Shahnoor Electronics assemble those and if necessary color television is taken under servicing department. The television is made up of four principal sets of parts: the exterior part or housing, the picture tube, the audio (sound) reception and stereo system, and the electronic components (parts). These electronics parts include cable and antenna input and output devices, a builtin antenna in most television sets, a remote control receiver, computer chips, and access buttons. The color television (CTV) assembly section was under the supervision of my mentor. That is why I got the clear idea on assembling a CTV. I worked on attachment of felt sheet to the front panel, setting main PCB (Printed Circuit Board) inside the cabinet, and connecting the speakers. To ensure the better service for the customers, warranty sticker on the back side of the CRT was placed. I placed the CRT very carefully by tapping four screws at its four corners. Then I plugged on the wires of power cord, sensor, speakers etc. sequentially on the main PCB. Few adjustments like color, brightness, contrast etc. were performed by me. By using magnetic machine I also checked horizontal and vertical adjustments. Sound quality, channel tuning, A/V input output ports were checked by me before back cover docking. I performed ground test at the final stage of assembly. At servicing station I did not have hands-on experience rather observed technicians doing there jobs and for better understanding they provided me few flow charts so that I could follow their works.
Design and Analysis of the Reduction of Harmonics at Inverter Output
(East West University, 2011-04-15) Habib, Md. Zakaria; Alim, lobair Ibna Abdul; Khan, Imrul Hasan
The aim of this thesis is to present a technique to reduce harmonics in output voltage of singll phase inverters. The thesis explains how harmonics is one of the most dangerous threats for the, appliances. The thesis also deals with the technique to reduce harmonics. A circuit based paralleling of two invertors by using interface reactors is investigated. The interface reactor is thls harmonic reducing element. Sine Pulse-width modulation is used to generate the gating signal: of the inverters. There is a phase difference between the gating signals of parallel branches. By varying the phase difference, an analysis is done to find the best situation when maximum harmonic elements can be reduced. Another two analyses are done by varying frequency ratio and modification index. A conclusion is made about the finest modulation index depending 01 BMS value of fundamental component and presence of 3rd, 5th th harmonic components between frequency ratio and specific harmonic components is also studied. It is possible, eliminate all harmonics up to a certain limit by setting the frequency ratio. An equation i: elimited for that. Analysis is carried out by using MA TLAB and PSPICE software.
Design and Implementation of a Line Following Robot with Temperature Sensing and Comparing Capability
(East West University, 1/19/2012) Ahmed, Sabbir; Khan, Md. Shlahuddin
Line following robot is a kind of robot which can detect a path drawn in a surface. This can be a black line in white surface or white line in a black surface. In this project we made a line following robot which can follow a white line drawn on a black surface. The robot has another feature - the ability to sense the temperature. So, the objective to make this robot is to follow a white line in black surface and also sense the temperature in its path. The robot is programmed so that it can measure temperature in its path at an interval of 30 seconds. The application of this robot is in temperature sensitive areas like cold storage, chemical industries, medicine manufacturing farms etc. In these areas, maintenance of temperature is an important issue, so we can easily use this robot. The principle of detecting the path uses the reflectivity of light. Black surface absorbs light and white surface reflects it. We have used seven LEDs (Light Emitting Diode) and seven LDRs (Light Depending Resistor) to detect the path. An LED and an LDR together make a single sensor circuit. When the sensor is over a white surface, the light from the LED reflects from the surface to the LDR and due to the decrease of resistivity of the LDR, the voltage across the LDR decreases. The output of each sensor circuit works as an input of a comparator (Ie LM324) which compares the output voltage ofLDR to a reference voltage which is given manually. If the LDR output voltage is higher than the reference voltage, then the comparator outputs logic high; otherwise the comparator output is logic low. So the comparator Ie converts the analog signal to digital. As we have used seven sensors to detect path, so we have a combination of seven bits of logical data. Value of this combination always changes during the path following. We use those combinations to the input pins of the microcontroller as the digital data. In our project we have used microcontroller ATmega16A from AVR. The microcontroller gives output (according to the data and the program code) to a motor drive IC.
Design, Construction and Analysis of a Single Phase Inverter
(East West University, 2011-05-14) Khan, M. Saddam Hossain; Islam, Mashfique; Rahman, Md. Istianatur
A signal phase inverter is designed and constructed to provide regulated output voltage at 220v. The output power stage is designed in two methods first one is using four power transformer in H-bridge mode to the load through a transformer, and another one is two NMOS power transistors coupled to the load through a transformer. The output is a 50Hz square wave which is obtained by totem-pole driver operation of two transistors using 50 Hz complementary trigger pulse stream for first method. And for the second method 50Hz square wave is obtained using a single PNP transistor. The inverter is constructed and presented. The circuit is tested and it is found that the waveforms obtained at different stages of the circuit conform well to those obtained by computer simulation. The inverter circuit is found to be efficient for applications in appliances.
Dhaka Polli Bidyut Samity – 1
(East West University, 1/31/2012) Islam, K.M. Shikul; Hakim, Md. Sad Bin; Tutul, Md.Rezaul Kabir
We have completed our undergraduate internship in Dhaka Polli Bidyut Sarnity-l, Polashbar~ Nobinagar, Savar, Dhaka. Dhaka Polli Bidyut Sarnity-l (DPBS-l) plays a vital role in power transmission and distribution in Dhaka city. The mission of DPBS-l is to ensure long term uninterrupted supply of quality power to the consumers in future. In Bangladesh the demand of power is approximately 5800MW. Public and private sector produces 63% and 37% of electricity respectively. Public sector produces electricity through Bangladesh Power Development Board (BPDB) and Electricity Generation Company of Bangladesh (EGCB). On the other hand private sector such as United Power Generation and Distribution Company Limited and Summit Power Limited produces power. Dhaka Polli Bidyut Samity-l is not able to produce power by itself. So it purchases power from United Power Generation and Distribution Company Limited and Summit Power Limited. Summit Power Limited produces 317MW electric power and supplies to the national grid. In near future to contribute more in power sector this company has plan to setup more branches of power station. The internship in Dhaka Polli Bidyut Samity-lhas given us experience to power generation system (at United Power Generation and Distribution Company Limited and Summit Power Limited) and also the transmission and distribution system (of DPBS-I). During our internship in DPBS-l, we were taught about the power plant management system in the power station. This report is the elaborate description of our practical experience.
Drive Test, Survey, Single Site Verification and Optimization in Wimax Technology.
(East West University, 1/31/2012) Shah, Md. Imran
Wi max (Worldwide Interoperability for Microwave Access) technology is the topic of my internee work. Drive test, survey, single site verification and optimization is the main subject of my internee work. I was under a senior RF engineer and had the full scope and independence to work on the project. While working on the project I had the scope to come cross many new things of the Wimax technology. This internship report provides the detail about the mobile Wimax system and its overall working procedure to maintain the drive test, survey, single site verification and optimization and also designing in a proper network planning which is helpful to offer better throughput broadband wireless connectivity at a much lower cost. During my internee period I have spent a superior time in learning and performing. I had the experience of corporate reporting working environment which affects an employee performance and approach to work. I also had the opportunity to work in practical field, which will be very helpful in my professional life.
GSM Structure; Operation of BSS; IDU, Rectifier, BTS Installing and Commissioning.
(East West University, 10/4/2011) Islam, Kazi Mazharul
Currently, the telecom sector in Bangladesh is dominated by a state-owned telephone company, Bangladesh telegraph and telephone Board (BITB) , vrttich has a virtual monopoly in fIxed line telephone service, and which enjoys monopoly rights in domestic long distance and international (terrestrial) services. Teletalk Bangladesh Ltd is a GSM based state-owned mobile phone company in Bangladesh. TeleTalk started operating on 29 December 2004. It is a Public Limited Company of Bangladesh Government, the ~ed telephone operator. TeleTalk provide GPRS and EDGE m.ternet connectivity and now waiting for the license from Government to a:art the 3G which is the latest cellular information service. Teletalk is ~ first operator in the country that gave BITB (now BTCL) incoming facility to its subscribers.The mission statement of Tele Talk is "Desher Taka Deshey Rakhun" (" Keep your Money in your Country").TeleTalk is the 6th largest mobile phone operator in Bangladesh with 1.147 million subscribers as up to JUly, 2010 I have completed my internship from Teletalk Bangladesh Ltd. I have done all of my internship tasks under Operation department. The Operation department of Teletalk Bangladesh Ltd. includes BSS department and NSS department. I have done my tasks at different BTS sites of Teletalk. The internship we did in Teletalk Bangladesh Ltd, gave us the opportunity to learn about how the planning, installing and commissioning is really done in the practical fIeld. So this report is about the topics that we have learned in our short intern period. Form this internship we have learned how to work in a team. We have also familiarized with a corporate environment. In our internship we have gathered lots of knowledge about many real life problems. When I work on Teletalk, I got opportunity to see and learn the entire task about communication technology and I completed all of the work successfully.
Impact of Quantum Mechanical Correction in Surface Potential Based Compact Model on the Drain Current of Nanoscale MOSFETs”
(East West University, 5/15/2011) Sumaia, Siddiqa; Haque, Nusrat; Mahmud, Marzana Mantasha
Impact of the Quantum Mechanical (QM) correction in surface potential based compact model on the drain current of nanoscale MOSFETs is studied. We have considered a QM correction model to the surface potential (l/ls) based compact model of M. A. Karim and A. Haque which has been proposed recently. This model does not use the bandgap widening approach. It directly adds the correction term to the semiclassicall/ls. It accounts for the wave function penetration effect into the gate dielectric. The validity of this model has been demonstrated through the modeling of the gate C - V characteristics. In our work we have studied the effect of this correction on the drain current characteristics of nanoscale MOSFETs. The results have been compared with two other models, PSP and Pregaldiny et al. both these methods incorporate QM correction through the bandgap widening approach. QM correction to l/ls in PSP is derived from triangular well approximation while Pregaldiny uses the variational approach. When the wave function penetration effect is considered for a given semiconductor charge density the average distance of charges from the Si-gate oxide interface considering the QM effect is reduced. This leads to the lowering of l/ls also. So the models neglecting the wave function penetration effect tend to overestimate the l/ls. Hence both PSP and Pregaldiny which overestimate l/ls tend to underestimate the drain current. The Karim model shows higher current than the two existing models and predicts a lower, more accurate threshold voltage. The percentage deviation of the drain current of the QM corrections of the PSP and Pregaldiny models has been observed with respect to Karim model. The percentage deviation is around 10 - 50% at higher gate voltage but the situation is extreme around 80 - 90% in moderate inversion (VGS ~ VT ) whose effect is more pronounced. Comparison between them shows that the wave function penetration effect into the gate dielectric plays an important role in modeling the drain current of nanoscale MOSFETs.
Manufacturing and Testing Process of CT-PT, Power and Distribution Transformer, Switchger, Breaker and Isolator.
(East West University, 9/15/2011) Akib, Nazmus Sakir; Khan, Md. Nur Rashed; Chowdhury, Nawshad Ahmed
We did our internship at ENERGYPAC ENGINEERING LTD, S/\VAR, BARUIPAR.\ from 31" May to 29th June and this internship report is the result of that two weeks attachment with that company. We have observed and learned those things practically which our teachers taught us in the class Energypac Engineering LTD. primarily manufactures substation equipment such as transformers and switchgcars etc. In this report we have focused on various types of machines. Various no of tasks were implicated to make a transformer.among those most of the tasks were introduce to us. Most of the raw materials come from abroad to manufacture a transformer. We were shown the making of transformer coil, which depends on the transformer power rating. We also also shown the assembling and internal connection setup of the transformer, including cooling system tank making and painting. After the manufacturing how those equipment is being tested this is also showed to us. Another important feature is the testing facility of ENERGYPAC ENGINEERING LTD. To ensure the best quality they test all their manufactured equipment. There are various types of test like magnetizing current test, high voltage test and special type test. These tests are done only at ENERGYFAC ENGINEERING LTD.
Manufacturing process of sub-stational equipments at energypac engineering Ltd.
(East West University, 10/2/2011) Rony, Md. Mahmudur Rahman Sheik; Uzzaman, Md. Mahbub
In this report we discussed about our observations at the factory of EnergyPac Engineering Ltd. EnegyPac mainly produces substational equipments, which are basically four types. These types are: Breaker & Isolator, Instrument transformer (CT/PT), Transformer (Power & Distribution), Switchgear. we have also visited some supporting sections, these are: Fabrications, CNC, Powder coating & paint and MlC shop Breakers and Isolators are used for tripping the system. EnergyPac manufactures only Vacuum circuit breaker (VCB). The name of a breaker is determined by the medium in which the arc is extinguished. By using the vacuum interrupter VCB is produced. When the breaker is tripped, for high voltage arc is created. But as the medium is vacuum so the arc is extinguished. EnergyPac manufactures three types of Isolators. These types are pantograph, centre break and double break. In the transformer section we discussed our observations in the power & distribution transformer section. A transformer is a device that can transfer energy from one circuit to another by electromagnetic induction. Basically the main part of transformer is core and coil. In this section we discussed about the selection and formation of core and coil, assembly of core and coil , protections and tests of transformer. In the switchgear section of the report we discussed our observations in the switchgear section of EnergyPac. Switchgear is used for protection and controlling of a system. EnegyPac manufactures two types of switchgears, one is L T switchgear and the other one is HT switchgear. In L T switchgear, relay senses the over current and sends trip signal to breaker. Then the beaker is tripped. If the power factor (PF) is decreased, then power factor improvement (PFT) capacitors are added to the load to improve PF of the system. In HT switchgear, microprocessor based relay senses all things and if fault occurs it sends a signal to general relay. Relay sends trip signal to VCB. Then the VCB is tripped. There are two types of instrument transformers, current transformer (CT) and potential transformer CPT). The manufacturing process is almost same. The raw material of core is cold rolled grain oriented (CRGO) silicon steel and the raw material of coil is copper enameled wire. After the assembly the core and coil, these are tanked up. For insulation process of the system insulation paper, oil and varnish is used. This CT and PT are used for measurement. When we worked on the EnergyPac, we got opportunities to observe the entire manufacturing processes of substational equipments. We tried our best to learn and know everything from the honorable engineers of EnergyPac.
Performance Comparison between INAS on Insulator and Silicon on Insulator Mosfets Using a Compact Model
(East West University, 1/23/2012) M. A. Al-Mamun; Shahriar, Shaimum; Chowdhury, Mamun
Silicon-on-insulator (SOl) MOSFET is one of the modem state of the art transistor in Qruch a semiconductor layer like silicon is formed above an insulator layer on a semiconductor substrate. In SOl MOSFET, there is much more advantages over bulk silicon MOSFET such as high speed operation, low power consumption, small short channel effects. Over the past several years, the inherent scaling limitations of silicon (Si) electron devices have fuelled the exploration of alternative semiconductors, with high carrier mobility, to further enhance device performance. In particular, compound semiconductors heterogeneously integrated on Si substrates have been actively studied: such devices combine the high mobility of lII-V semiconductors and the well established, low-cost processing of Si technology. This integration, however, presents significant challenges. Conventionally, heteroepitaxial growth of complex multilayers on Si has been explored but besides complexity, high defect densities and junction leakage currents present limitations in this approach. Motivated by this challenge, we use a three surface potentials (gate oxide-silicon film interface, silicon-film-buried oxide interface and buried oxide-substrate interface) based compact model to study a fully depleted SOl and XOI MOSFETs. We have simulated the surface potentials, surface charge density, gate capacitance, drain current, transconductance and unity gain frequency of SOl and XOI MOSFETs. The different output characteristics show a better performance for InAs. We have got high drain current transconductance and unity gain frequency of XOI MOSFET. On the other hand, we got very low (negative) threshold voltage for XOI MOSFET. So, by using XOI MOSFET, we can get high speed operation and amplification, low power consumption than SOl MOSFET as well as bulk silicon MOSFET.
Polli Bidyut Somity -1
(East West University, 10/5/2011) A.H.M. Zamiul Hq Tuhin
Electricity is a fundamental requirement, to upgrade the SOCIO economIc condition and to alleviate poverty. Proper and enough electricity supply have a great positive impact on our national economy as well as on GDP of the country, where GDP is one of the important measures of the economic condition for a developing country like Bangladesh to attract foreign investment. But Bangladesh is going through a huge power crisis for a long time. Demand of power is very high but supply is not adequate . Rural Electrification Board is the largest electricity distribution company in Bangladesh which is coverIng 61 districts and 48,687 villages. REB has 70 'Polli Bidyut Somity', through this ' Somity' REB operates and distributes electricity all over Bangladesh. Among this 'Somity' Dhaka Polli Bidyut Somity-l(PBS-l) is one of the best electricity distribution company among it's kinds. To meet the demand of consumer Dhaka PBS-l generates electricity through Summit Power Limited and United Power Generation and distribution Company Limited. PBS-l also has their own substation to ensure electricity supply to the user end. The main goal of REB is to improve the standard of living and quality of life for the rural people. During our internship we observed the generation and distribution sector of REB. To observe the generation sector we visited Summit Power Limited and United Power Generation and distribution Company Limited and observe how they operate, generator factors and other technical terms of generation sector. To observe the distribution sector we visited Power Grid Company Bangladesh and their own distribution substation. From our internship we also learned about staking design and supervision and the electrical equipments they are using.
Power Generation, Transmission and Protection System Equipments of Mymensingh Power Station (MPS)
(East West University, 1/29/2012) Chowdhury, Md. Shoel Rana; Hossain, Md. Nafiz; Mahmud, Md. Ashik
Power is one of the most vital sectors for the growth of country's economy. As a developing country, the significance of power is enormous. Rural development is directly correlated to rural electrification in Bangladesh. Socioeconomic development in rural areas causing the increasing demands of electricity day by day. With the growing use of power based industries in agriculture, small & cottage industries, the stable supply of power both in urban and rural areas in the country has become the demand ofthe time. With the appearance of market economy, the demand of stable supply of power has become more and more important for trade, commerce, industry and agriculture for success of overall development of the country and alleviation of poverty. Government of Bangladesh has been implementing the concept of privatization in power sector since last decade. Mymensingh Power Station (MPS) is one of these pilot projects launched in private power generation project. Accordingly a public limited company named Rural Power Company Limited was formed and registered on 1994 by active participation of Rural Electrification Board (REB). OUT internship in Mymensingh Power Station, Rural power Company Limited (RPCL), helped us to learn the generation and distribution power practically. During this internship we got the opportunity work as a member of a team in combine cycle power plant. The generation of electricity is one of the most muhifunctional processes in the world. During the internship period we gathered practical experience in substation, switchgear, transmission and protection of the electricity and the overall control of the power generation system.
Power Generation, Transmission Distribution and Protections System Equipments of Ashuganj power station company Ltd.(APSCL).
(East West University, 9/24/2011) Das, Pintu; Ahmed, Tahsin; Purabrammhan, Bishuddhananda
The power sector in Bangladesh faced numerous problems characterized by lack of supply capacity, frequent power cuts, unacceptable quality of supply, and poor financial and operational performance of The sector entities. There have been a number of reforms in the power sector in Bangladesh since her independence, but most of these reforms failed to bring desired improvements in the power sector . among the three main components of the power system, recent reform activities were centered on generation and transmission. The most pressing problem in the power sector has been with the dislribution system, which is characterized by heavy system loss and poor collection performance; however, the distribution system seldom got the priority in reform initiatives. Ashuganj Power Station Company Ltd. (APSCL) owns the second largest power station in Bangladesh. The installed capacity by its 8 units is 724 MW and present de-rated capacity is 642 MW. Ashuganj Power Station fulfills about 15% of power requirements of the country. To face the growing requirements for power in the country Government of Bangladesh decided to setup another units of 1000 MW capacities in Ashuganj. Our internship in APSCL (Ashuganj Power Station Company Limited), found on the planning and distribute on the practical field of power sector. Through this internship we got the opportunity to work as a member of a team which was involved in Generator section, transformer section, steam turbine, Gas turbine and combine cycle power plant. In this power station company, various types of work done by us. The superintendent engineer showed us the protection and switchgear section of generator, transformer and turbine. We mainly worked for a long term in the substation section. Control unit of this "nole power station is very enormous. The main aim to set up a power plant, one have to give three things. Protection, Monitoring and Vision. The generation of electricity is one of the most complex processes in the world. After a lot of steps completion we generate it and distribute to the consumers. We gathered some experience in generator protection. We also had some experience to control a largest power plant working in the control room with the help of our superintendent engineer. On the completation of this internship we can relate the practical experience with the theoritical experience in power sector. Overall in our internship, we have gathered lots of knowledge about many real life problems.
Power Generation, Transmission Distribution and Protections System of the Equipments of Ashuganj Power Station Company Ltd.(APSCL).
(East West University, 10/4/2011) Islam, Md. Maidul
Development of sources of energy to accomplish useful work is the key to the industrial progress which is essential to the continual improvement in the standard of living of people everywhere. In Bangladesh the demand of power is approximately 5800 MW. Public and private sector produces 63% and 37% of electricity respectively. Public sector produces electricity through Bangladesh Power Development Board (BPDB), Ashuganj Power Station Company LTD (APSCL) and Electricity Generation Company of Bangladesh (EGCB). On the other hand, private sector produces power through small independent power producers and rental that government buys at a constant price. BPDB individually produces 46% of the total production. To fulfill this large demand there are many power stations that are being setup throughout the country. This will reduce the load shedding in the long run. It is expected that this step will also put a contribution to the national economy. To fulfill the large demand of electric power in Bangladesh, the Ashuganj Power Station Company Ltd. (APSCL) plays a vital role in power generation being the second power station in Bangladesh. The APSCL produces 724 MW of electric power and supplies to the national grid. Its contribution to the country is 15% of the total national power generation sector. It has total 8 units. In near future to contribute more in the power system they have plan to setup more units in the power station. It is expected that the power generation in APSCL will be increased by its own property. The mission of this company is to ensure long-term uninterrupted supply of quality power to the consumers in future. The internship in Ashuganj Power Station Company Ltd. (APSCL) covers all the process of power generation, transmission and distribution system of APSCL. During our internship in APSCL, we were taught about the power plant management system in the power station. This large power station (APSCL) has a large number of equipments which was observed by us during the internship period. This report is the attachment of that industrial training. The systems or the devices those were observed during the internship includes generator, boiler, control room, water treatment plant, steam turbine, gas turbine, compressor, backup system, cooling system, transmission system, distribution system, substation equipments like- power transformer, current transformer, potential transformer, protective relays, circuit breakers, underground cable connection, isolator, insulator, lightning arrester and other essential equipments of the APSCL. In this report the main emphasize is given on the explanation of those things along with the acquired knowledge about power generation, transmission, maintenance and distribution system in Ashuganj Power Station Company Ltd. (APSCL).