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The final year students
of the program of B.Sc. in Electrical and Electronic Engineering (EEE) of the
Department of Electrical and Electronic Engineering (EEE) of Green University
of Bangladesh took part in a day-long study tour to the Ghorashal Thermal Power
Station on 15 June 2015. The prime objective of this tour was to help the
students to know about power plant and its operational, maintenance and
management. Twenty five (25) students including four (4) female students led by
Prof. Dr. Engr. Muhibul Haque Bhuyan, Chairperson of EEE Department participated
in the tour. Besides, two (2) other faculty members of the EEE Department,
Engr. Robiul Hossain Md. Raffi, Lecturer and Engr. Md. Badruddoja Majumder,
Lecturer also joined with the participating students. They guided the students
during the day-long study tour.
Ghorashal Thermal Power
Station is the biggest power plant in Bangladesh located at Polash, Narshingdi
with installed generation capacity of 950 MW. It has 6 power generating units
with power generation capacity ranging from 55 MW to 210 MW per unit. All the
generators are run by steam turbines. The tour comprised
three parts. At first, the students went to observe the power generation units
where the Engineers of the power station briefly explained the working
principle of the thermal power station and then demonstrated its operation. One
unit of the generator was out of order right now. So, both generator and
turbines were open and students were able to observe all the opened parts and
have huge practical idea about various parts of alternator and steam turbine. After
that they visited the electrical control room and then they observed the
mechanical control room and boiler section. At last, they observed the sub-station.
At electrical control
room, the students observed many control panels, such as,
control panels for 230 kV, 132 kV, 33 kV and 11 kV bus bars, switch gears,
isolator control knobs, breaker operation knob, ammeter, voltmeter, frequency
meter, power factor meter etc. The sub-station can be controlled properly from
the control room. Then the students went
to the mechanical control room where they observed how the mechanical
parameters like boiler’s flow rate, steam flow to the turbine, flame etc. is
controlled. Then they observed the boiler, water treatment plant, steam turbines,
governor, cooling system, economizer, super-heater, re-heater and other
mechanical components of the power plant.
At last, the students observed
the sub-station that is consist of several electrical equipment like power,
auxiliary transformers and distribution transformers, protection devices like
isolators, circuit breakers, HV cables, PTs, CTs, earthing and lightning arresters.
The generation voltage is around 11-15 kV, which is converted to 132 kV or 230 kV
for transmission. In sub-station, there are parallel bus bar systems available.
In this sub-station, three types of breakers, such as, vacuum, SF6 and
air circuit breakers, are available. At the end of the day,
students came back to Dhaka with practical experiences of power plant through
this study tour. This was a very effective tour for both teachers and students.
Their theoretical knowledge is supplemented with this study tour.
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