ET201040 (Industrial Visit Report)
ET201040 (Industrial Visit Report)
ET201040 (Industrial Visit Report)
Schedule
Duration: --- 01 Day
Date: 23.03.2024
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Report on
By
Mohin Uddin
ID: ET201040
FACULTY OF SCIENCE
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ACKNOWLEDGMENT
I would like to express my cordial thanks and gratitude to my Creator as
well as to IIUC & our department who gave me the golden opportunity
to do this wonderful visit to IIUC Substation. This visit helped me in doing
a lot of research and I came to know about so many new things. I am
really thankful to them.
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TABLE OF CONTENTS
Page
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LIST OF FIGURES
Figure Page
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LIST OF ABBREVIATIONS
HT : High Tension
LT : Low Tension
MCCB : Molded Case Circuit Breaker
PF : Power Factor
PFI : Power Factor Improvement
VCB : Light Dependent Resistor
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ABSTRACT
Without practical experience theoretical knowledge is incomplete. In our program
of EEE we have studied courses related to Transformer, Transmission and
Distribution of Electrical power and Protection of the system. To implement our
learning practically we needed to visit and observe the operation of the equipments
and systems. We have visited IIUC Substation 03 on this purpose and fulfilled our
experience about practical knowledge.
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Chapter 1
International Islamic University Chittagong (IIUC) is one of the top graded Government
approved private universities in Bangladesh. In 2004 IIUC was recognized as one of the 9 top-
graded Private Universities by a Government-appointed High Powered Team led by the UGC
Chairman.
At present, IIUC is the largest private university with 370 (Full time: 270 & Adjunct: 100)
teachers and 14000 students. IIUC is a large consumer of PGCB with several buildings and
laboratories. It has 3 substations and Faculty of Science & Engineering (FSE) Building is one
of the major consumer buildings.
In this visit, we have visited the sub-station 03 which is situated beside FSE and supplies
electricity to FSE Building 01.
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1.3 Visit summary
Chapter 5- Conclusion
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Chapter 2
EQUIPMENT DESCRIPTION
2.1 Components and Equipments Observed
We have observed operation of the following components.
❖ Drop Out Fuse
❖ Transformer
❖ Generator
❖ Power Factor Improvement Unit
❖ Automatic Transfer Switch Panel
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2.3 VCB - Vacuum Circuit Breaker
The A vacuum circuit breaker is a kind of circuit breaker where the arc quenching takes place
in vacuum medium. The operation of switching on and closing of current carrying contacts
and interrelated arc interruption takes place in a vacuum chamber in the breaker which is
called vacuum interrupter.
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2.5 11 KV transmission line
The substation is fed with a 3 phase 11 KV transmission line. It entered the substation
from West-South corner
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2.7 MCCB - Molded Case Circuit Breaker
MCCB stands for Molded Case Circuit Breaker. It is another type of electrical protection
device which is used when load current exceeds the limit of a miniature circuit breaker.
The MCCB provides protection against overload, short circuit faults and is also used for
switching the circuits. It can be used for higher current rating and fault level. The wide current
ratings and high breaking capacity in MCCB find their use in industrial applications. MCCBs
are used for protection of capacitor bank, generator protection and main electric feeder
distribution having rating 40A, 80A, 160A, 200A 400A, 630A, 1000A. they offers adequate
protection when an application requires discrimination, adjustable overload setting or
earth fault protection.
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2.8 Transformer
A transformer is a passive electrical device that transfers electrical energy from one electrical
circuit to another, or multiple circuits. A varying current in any one coil of the transformer
produces a varying magnetic flux in the transformer's core, which induces a varying
electromotive force across any other coils wound around the same core. Electrical energy can
be transferred between separate coils without a metallic (conductive) connection.
A step-down 3 phase transformer is used for decreasing high AC voltage of 11KV to low
voltage of 440V is used in the substation.
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2.9 Generator
The generator is used as a power back up during load shedding and power failure of main
line. The rating of this French generator is 250 KVA.
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2.10 Power Factor Improvement (PFI) Unit
A PFI unit has been used as per PGCB demand to improve the power factor near about
unity. It is made by a bulk of condensers connected in parallel and each having a circuit
breaker and a controlling switch. The PFI unit can control the Power Factor either
aromatically or manually.
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2.11 Automatic Transfer Switch Panel
An Automatic transfer switch panel, or ATS panel, is a type of transfer panel used with a diesel
generator to automatically switch between the mains and generator in the event of a power
failure.
The generator will start / stop automatically depending on the mains supply. The mains
power coming into contact with the generator, which would almost certainly burn out if
this happened.
It stops the generator from back feeding the mains when its failed, endangering the lives of
electricity utility workers.
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2.12 Feeder Distribution Lines
The feeder distributor lines are insulated properly from each other. They went out together
from the substation to the North and then according to the loads situated.
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Chapter 3
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3.2 Working of the Substation
HT Panel
Transformer
LT Panel
PFI Unit
At first the high voltage 11KV line enters to the HT panel where VCB and measuring
transformers are mounted. Then it goes to the transformer which steps down the voltage
from 11KV to 440V/230V. Then This lowered voltage lines goes to the LT panel bus-bar
where several MCCBs are used as protection devices.
After the LT panel there is a PFI unit which can automatically improve the power factor using
condenser bank. Each condenser is connected to a MCCB in series and each has a manual
control switch. The ATS panel decides whether to supply with main through LT panel or to
supply with generator through ELT panel.
The ELT panel is similar to the LT panel but there is no PFI unit while supplying with the
generator through ELT panel.
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Chapter 4
By performing this visit we have came to know about many practical facts of the transmission
and distribution system of electrical power. Also we have learnt and observed the protection
system of the substation. Along with these we have observed details practical operation
of Electric machines like Transformer, Generator. To sum up we have had the following
learning outcomes.
◼ Operation of Transformer
These learning will help us a lot in our future industrial visits and to perform industrial
jobs. This experience will gather us more confidence in field work.
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Chapter 5
CONCLUSION
The visit was a very important one to complete the learning on multiple sectors of
electrical study. Without practical experience theoretical knowledge is incomplete. We
have had learning with enjoyment throughout the visit. We hope that the experience will
serve us much in future. In future aspects we will try to carry out more detailed and
lengthy visit as well as training in several industries also.
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