http://dspace.ewubd.edu:8080/handle/123456789/139 2026-04-05T23:50:45Z 2026-04-05T23:50:45Z Arafat, Md. Yeasin Ahsan, Nayeem Md. Nuruzzaman http://dspace.ewubd.edu:8080/handle/123456789/171 2019-03-13T07:44:25Z 0012-01-01T00:00:00Z

Power generation, transmission and protection system equipments of Desh Enrgy Limited Arafat, Md. Yeasin; Ahsan, Nayeem; Md. Nuruzzaman Power is well considered as one of the most vital infrastructure capability for growth of country's economy. The significance of power cannot be denied. Socioeconomic development in Bangladesh is causing the increasing demands of electricity day by day. 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 agreed in principle to the concept of private sector electricity generation. Government approved this project as a pilot project of private Power Generation. Accordingly a private limited company named Desh Energy Limited was formed and registered on 2000. The company has taken numerous development programs for increasing its generation which is the demand of time. The plant capacity of DEL in Narayanganj is around 100 MW. The objective of our internship at DEL (Desh energy Limited), was to get a clear conception on power generation and transmission. Through this internship we got the opportunity to work as a member of a team which was involved in Fuel section, Generator section, transformer section, and substation. We learned about the protection and switchgear section of generator, transformer, and the whole power plant. We worked for fifteen days in power generation and maintenance system. The power station control system is automated and modernized. Generation, Protection, controlling and transmission to the national grid are the main aim to set up this power plant. There are various processes to produce electricity. Following necessary steps we generate electricity and transmit it to the national grid. We gathered experience in protection of some important equipment related to power generation process, such as generator protection, transformer protection, and substation protection, along with its operating principles, maintenance and testing system. We also gathered experience of controlling a power plant through operating and monitoring from the control room, with the help of our superintendent engineer. Upon completion of this internship, we are able to relate the practical experience with the theoretical knowledge in power sector. It has helped us to understand the practical problems better and their solutions related to several aspects of power plant. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0012-01-01T00:00:00Z Alam, Sabbir Masqur Khan, Md. Nasim Ahmed Hasan, Md. Abul http://dspace.ewubd.edu:8080/handle/123456789/170 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

Microcontroller Based Color Analyzer With Computer Interfacing Alam, Sabbir Masqur; Khan, Md. Nasim Ahmed; Hasan, Md. Abul In textiles and garment related industries, it is often needed to dye fabrics with a particular color. The dye color is usually composed using some base or primary colors (such as red, green and blue). However, it is difficult to identify the exact ratio of primary colors that combine to form a particular color using our eyes. Therefore, to compose the color, many trials and errors are required, which takes huge amount of time and resources. If a system can be developed that can identify the primary color constituents of a color, then the dye could be easily prepared. In this project, we analyzed the red-green-blue (RGB) components of a light (reflected from any colored plain surface) using a color sensor and then display and save the results in a computer. We used a color sensor (TCS230) for analyzing the color, which converts color intensity to frequency. More specifically, its output is a square wave whose frequency is directly proportional to the intensity of light incident on the sensor surface. The RGB components are analyzed using the principles of light reflectivity and some color filters. The computer interfacing is done through Universal Serial Bus (USB). USB was chosen considering the drawbacks of other standard interfacing techniques. We also developed a GUI to display the data on screen and the software stores the analyzed data on a text file for future usage. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0001-01-01T00:00:00Z Chisim, Jenifer Jue Akter, Shafin Akter, Nasrin http://dspace.ewubd.edu:8080/handle/123456789/169 2019-03-13T07:44:25Z 0009-01-01T00:00:00Z

Combined Cycle Power Plant and Substation of Ashuganj Power Station Company Limited (APSCL) Chisim, Jenifer Jue; Akter, Shafin; Akter, Nasrin As a part of the requirement of B.Sc in Electrical Electronic and Engineering, we went through the procedure of electricity production, distribution and transmission system of Bangladesh in the following internship report. During our internship program, we have visited the second largest power station in Bangladesh that is Ashuganj Power Station Company Ltd and cultured several important features about APSCL. For instance, there are 9 units with installed capacity of 777 MW. Approximately 15%of the total demand for power (electricity) is met by APSCL. This internship program has opened a window of opportunity for us, as student of EEE department at East West University to validate, our theoretical knowledge with the field experience. We have observed different equipments and have learned different procedures of maintaining power station to run them efficiently and safely. This includes generator, boiler, water treatment plant, steam turbine, gas turbine, compressor, backup system. In addition we have also observed substation equipments such as power transformers, current transformer, potential transformer, protective relays, circuit breakers, insulator, lightning arrester and other key equipments. With the aid of this report, we primarily focus on the details of Combined Cycle Power Plant by incorporating the knowledge about power generation, transmission, maintenance and distribution system at Ashuganj Power Station Company Ltd. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

0009-01-01T00:00:00Z Rahman, Atiqur Mannan, Md. Rafeen Islam, Md. Ifranul http://dspace.ewubd.edu:8080/handle/123456789/168 2019-03-13T07:44:25Z 0001-01-01T00:00:00Z

Performance comparison of Graphene and Silicon nanowire transistors Rahman, Atiqur; Mannan, Md. Rafeen; Islam, Md. Ifranul Graphene nanoribbons and carbon nanotubes represent a novel class of low-dimensional materials. All these graphene based nanostructures are expected to exhibit the extraordinary electronic properties and therefore these are the promising candidates for a wide range of nanoscience and nanotechnology applications. So, in this work, the performance potential of ballistic graphene and silicon nanowire field effect transistors are examined for future high performance applications. CNT is graphite sheet with a hexagonal lattice that has been wrapped up into a seamless cylinder. GNR consists of carbon atoms arranged in a 2-dimensional honeycomb crystal lattice. And rode like silicon crystals with a diameter of less than 100 nm is referred to as SiNW. These materials are being used as the channel materials of the transistors. In this work drain current ID, transconductance gm, number of mobile charge, quantum capacitance CQ, gate capacitance CG, gate delay τ and cut off frequency fT of GNR, CNT and SiNW transistors have been calculated using ballistic top of the barrier model and then we plot those variables with respect to gate bias. To realize the performance of these three types of transistors, it is necessary to compare those characteristics with each other. On-current in carbon based channel is higher as well as ION/IOFF is higher than SiNW channel due to lower effective mass. Higher on-current indicates sharper slope in current curve which ensures higher transconductance. So, CNT transistor has the highest transconductance. The density of states(DOS) of CNT and GNR transistors are lower than SiNW transistor. And the reason behind small gate capacitance is low density of states. On-current, transconductance and gate capacitance control the switching speed of a transistor. So from the simulations it seems that graphene transistors can be the candidates for future digital switches. But it is also important that SiNWs in particular are potentially very attractive, given the central role of silicon in the semiconductor industry and the existing set of known fabrication technologies. This thesis submitted in partial fulfillment of the requirements for the degree of B.Sc in Electrical and Electronic Engineering of East West University, Dhaka, Bangladesh.

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