Power generation, transmission, distribution and protection system of the equipments of Ashuganj power station Company limited (APSCL)

Abstract

A shortage of electric energy is the biggest problem to the economical growth of any country. The power sector of Bangladesh faced various problems such as: lack of supply capacity, frequent power cuts, unacceptable generation of power, and poor financial and operational performance and etc. In Bangladesh, The present maximum demand of electricity varies from 4,500 MW to 5,600 MW and it is expected to rise up to 7,000 MW within the next two years. But maximum generation available is between 3,800 MW and 4,600 MW. The difference between maximum demand and maximum generation of power is approximately 2,000 MW. Due to oldest set-up and de rated efficiency of the maximum power plant In APSCL(Ashuganj Power Station Company Ltd), where we have done our internship, has 9 units with installed capacity of 777MW. But its present de rated capacity is 731MW and dependable capacity at a delivery point 624MW. Ashuganj Power Station fulfills about 15% of power requirements of the total country. Manpower at APSCL is almost 525 (as on 30-06-2011) on regular basis, which plays a vital role in the job market of developing country. Through this internship, we observe how a power station can generate the power and transmitted the power and also protect the power system equipment. And also learned about different systems and equipment, which is used for power generation, transmisson, distribution and protection. In APSCL, total 9 unit exsits. we woks in different section in different days, such as generation section, in generation section we observe unit 1&2 steam turbine generator(64MW) and its protection system. Combine Cycle power plant section, in this section we observe GT1 & GT2 and ST and its generation system, protection system and working princpal. Sub-Station section, in this section we observe the operation of sub-station equipments and protection of this equipments, such as; Power transformer, Auxilary Transformer, Bus Bar, Current Transformer, Potential Teansformer, Circuit Breaker(SF6, Minimum Oil, MCCB), Isolator, Insulator and different types of cables. In operation section, we observe the unit 3, 4 & 5 and its total operation, how steam is produced in the boiler and gose to the turbine section with a specific temperature and pressure. By this internship we could relate our theoritical knowledge with practical experience.