Power Generation, Transmission and Distribution of Ashuganj Power Station Company Limited (APSCL)

Abstract

We got an opportunity to complete our internship in Ashuganj Power Station which is the second largest power station in Bangladesh at present. Internship was necessary for us to fulfill the requirements for the degree of Bachelor of Science in Electrical and Electronic Engineering. Our internship started on 26 December, 2011 and ended on 11 January, 2012. Our total working hours were 105 hours. Our internship at Ashuganj Power Station Company Limited (APSCL) was on the generation and distribution of the practical field of power sector. During this internship we got the opportunity to work as a member of a team which was involved in generator section, combined cycle power plant, thermal or steam power plant, sub-station section, operation section, instrumentation and control section. After completion of a complex procedure power is generated supplied to the grid. We gathered practical experiences about generator, generator cooling system, turbines and generator protection system in the generator section of APSCL. We gathered practical experiences about steam generating equipments like boilers, condenser, water treatment plant, feed water tank, gas treatment plant and steam auxiliaries equipments from thermal power plant. We also gathered practical experiences about combined cycle power plant which consists of two plants like gas turbine power plants and steam turbine power plants. We gathered practical experiences about the components of combined cycle power plant are diesel engine, compressor, combustion chamber, diffuser and gas turbine. We gathered practical knowledge about instrumentation and control system like selection of instrumentation and how to control different type of valve, pump, pressure gauge, flame detector and protection system using directly operating system or digital control system. The substation of APSCL is outdoor type, step up, double bus bar type substation .We gathered practical experiences about different types of equipments in the substation of the APSCL i.e. power transformers, instrument transformers, SF6 circuit breaker, oil circuit breaker, air blast circuit breaker, relay, lightning arrester, bus-bar, transmission line. During our internship period we also learn about the bushing connection of power transformer and megger test of circuit breaker in the substation of APSCL. We observed that the electric power is first produced at power station and then delivered to the consumers through a large network of transmission and distribution system. We also visited the control room of APSCL where engineers and technicians control and monitor the electricity flowing in and out of the substation and the functioning of all the electric equipments, through severalpanels in the control room.