BANGLADESH POWER DEVLOPMENT BOARD(GTC)
INTERNSHIP
REPORT ON INDUSTRIAL TRAINING AT GHORASHAL TRAINING CENTER (GTC)
*********** GTC Computer Simulation Lab ***********
*********** GTC Computer Simulation Lab ***********
INTERNSHIP
REPORT ON INDUSTRIAL TRAINING AT GHORASHAL TRAINING CENTER (GTC)
An Internship Report submitted in
partial fulfillment of the requirements for the Award of Degree of
Bachelor of Science in Electrical
and Electronic Engineering
by
Md
Idris Ali
ID:
2015100500009
Supervised by
ENGR.
sHAHID JAMAN
Lecturer Coordinator (Evening)
Department
EEE, SEU
Department of Electrical and
Electronic Engineering School of Science and Engineering
Southeast University
May 2019
----------------------------------------------------------------------------------
Certification
This is to certify that this Internship
entitled “Internship Report on Industrial Training at
Ghorashal Training Center (GTC)”
is done by the following student under my direct supervision and this work has
been carried out by them in the Ghorashal Power Plant in partial fulfillment of
the requirements for the degree of Bachelor of Science in Electrical and
Electronic Engineering. The presentation of the work was held on 23th May 2019.
Signature of the candidates
_____________________
Md Idris Ali
ID: 2015100500009
Countersigned
__________________________
Engr
Shahid Jaman
Supervisor
Lecturer & Coordinator (Evening)
Department of Electrical and
Electronic Engineering
School of Science and Engineering
Southeast University, Dhaka,
Bangladesh.
----------------------------------------------------------------------------------
The Internship entitled “Internship Reports On Industrial Training at
Ghorashal Training Center (GTC)” submitted by Md Idris
Ali, ID:2015100500009 Session:
Summer 2015 has been accepted as satisfactory in partial fulfillment of the
requirements for the degree of Bachelor of Science in Electrical and
Electronic Engineering on 23 May,
2019.
BOARD OF EXAMINERS
__________________________________
Prof. Dr. Engr. Muhibul Haque Bhuyan Chairman Professor and Chairman
Department of EEE, SEU
_________________________________
Engr. Shahid Jaman Supervisor
Lecturer & Coordinator (Evening)
Department of EEE, SEU
________________________________
Engr. Azwad Tamir Internal Member
Lecturer
Department of EEE, SEU
H
--------------------------------------------------------------------------------
Dedicated
to
Our Parents
---------------------------------------------------------------------------------
CONTENTS
List of Figures
|
13-14
|
List of Table
|
15
|
List of Abbreviation
|
16
|
Acknowledgement
|
17
|
Abstract
|
18
|
Chapter 1
|
Introduction
|
19-22
|
1.1
|
Introduction
|
20
|
1.2
|
Background of Ghorashal Power
Station
|
20
|
1.3
|
Company Objective
|
20
|
1.4
|
Generation Details
|
21
|
1.5
|
Repowering project
|
21
|
1.6
|
About Ghorashal Training Centre
|
21
|
1.7
|
Objective of the Internship
|
22
|
1.8
|
Future project of GPS
|
22
|
Chapter 2
|
Different
Types of Power Plant
|
23-39
|
2.1
|
Steam
Turbine Power Plant
|
24
|
2.1.1
|
Introduction to steam
turbine
|
24
|
2.1.2
|
Air collection
|
24
|
2.1.3
|
Forced draft fan
|
24
|
2.1.4
|
Air pre-heater
|
24
|
2.1.5
|
Flow
transmitter
|
25
|
2.1.6
|
Fuel
gas
|
25
|
2.1.7
|
Line
gas control valve
|
25
|
2.1.8
|
Gas
flow meter
|
25
|
2.1.9
|
Gas
heater
|
25
|
2.1.10
|
Water
collection
|
25
|
2.1.11
|
Pump
|
25
|
2.1.12
|
Water
Purifying basin
|
26
|
2.1.13
|
Water
filter house
|
26
|
2.1.14
|
De-Mineralized
process
|
27
|
2.1.15
|
Boiler
|
27
|
2.1.16
|
Water
tube boiler
|
27
|
2.1.17
|
Ignition
|
27
|
2.1.18
|
Burner
|
28
|
2.1.19
|
Boiler
drum
|
28
|
2.1.20
|
Safety
valve
|
28
|
2.1.21
|
Pressure
Transmitter
|
28
|
2.1.22
|
Boiler
efficiency:
|
29
|
2.1.23
|
Stack
|
29
|
2.1.24
|
Steam
turbine
|
29
|
2.1.25
|
Sections
of steam turbine
|
29
|
2.1.26
|
Operation
and Maintenance
|
30
|
2.2
|
Gas
Turbine Power Plant
|
30
|
2.2.1
|
Introduction
|
30
|
2.2.2
|
Working
Principle
|
31
|
2.2.3
|
Gas
turbine Components
|
31
|
2.2.3.a
|
Air
Inlet Equipment
|
32
|
2.2.3.b
|
Compressor
|
32
|
2.2.3.c
|
Centrifugal
Compressor
|
32
|
2.2.3.d
|
Combustion
System
|
32
|
2.2.3.e
|
Turbine
|
33
|
2.2.3.f
|
Gas
path Description
|
33
|
2.2.3.g
|
Turbine
Base & support
|
34
|
2.2.4
|
Compressor
Section
|
34
|
2.2.5
|
Combustion
System
|
35
|
2.3
|
Combine
Cycle Power Plant (CCPP)
|
35
|
2.3.1
|
Combine
Cycle
|
35
|
2.3.2
|
How a Combined-Cycle Power Plant Produces
Electricity
|
35
|
2.3.3
|
Heat recovery system captures exhaust.
|
36
|
2.3.4
|
Steam turbine delivers additional electricity
|
36
|
2.3.5
|
Main Components
|
36
|
2.3.6
|
Operating Mode
|
37
|
2.3.7
|
Schemes of Combined Cycle
|
37
|
2.3.8
|
Combined Cycle Advantages
|
37
|
Chapter
3
|
Substation
|
38-50
|
3.1
|
Introduction
of substation
|
39
|
3.2
|
Overview
of Power Transmission and Distribution
|
39
|
3.3
|
Voltage
Classes of GPS
|
40
|
3.4
|
Grid
Voltage and Distribution Voltage of GPS
|
40
|
3.4.1
|
Grid
Voltage
|
40
|
3.4.2
|
Distribution
Voltage
|
40
|
3.5
|
System
Components:
|
40
|
3.6
|
Transformer
|
41
|
3.6.1
|
Power
Transformer
|
41
|
3.6.1.a
|
Radiator
|
41
|
3.6.1.b
|
Breather
|
42
|
3.6.1.c
|
Bushing
|
42
|
3.6.2
|
Potential
Transformer
|
42
|
3.6.3
|
Current
Transformer
|
42
|
3.6.4
|
Unit
Transformer
|
42
|
3.6.5
|
Intermediate
Potential Transformer
|
42
|
3.7
|
Maintenance
of Transformer
|
43
|
3.8
|
Distribution
Transformers
|
43
|
3.9
|
Substation
Transformers
|
43
|
3.10
|
C.T
(Current Transformer)
|
44
|
3.11
|
P.T
(Potential transformer)
|
44
|
3.12
|
Isolator
|
44
|
3.12.1
|
Isolator
can be in three types
|
44
|
3.13
|
Power
Circuit Breaker
|
44
|
3.13.1
|
Minimum
Oil Circuit Breaker
|
45
|
3.13.2
|
Maintenance
of Minimum Oil Circuit Breaker
|
45
|
3.13.3
|
SF6
Circuit Breaker
|
45
|
3.14
|
Earthling
Switch
|
45
|
3.14.1
|
Operating
sequence for maintenance purpose
|
46
|
3.15
|
Lightning
Arresters
|
46
|
3.15.1
|
Rod
Gap Lightning Arrester
|
46
|
3.15.2
|
Horn
Gap Lightning Arrester
|
46
|
3.16
|
Relay
|
46
|
3.16.1
|
Electrical
Relay
|
47
|
3.16.2
|
Electronics
Overload Relay
|
47
|
3.16.3
|
Buchholz
relay
|
47
|
3.17
|
Power
Capacitors
|
47
|
3.18
|
Sub-station
Auxiliary Supply
|
47
|
3.19
|
Bus
Bar
|
48
|
3.20
|
Types
of bus bar
|
48
|
3.21
|
Insulator
|
48
|
3.21.1
|
Pin
Type Insulators
|
48
|
3.21.2
|
Suspension
Type Insulator
|
49
|
3.22
|
Transmission
Line
|
49
|
3.22.1
|
Different
Transmission Line Pole Structure
|
49
|
3.23
|
Wave
Trap
|
49
|
3.24
|
Cables
|
50
|
3.25
|
Conclusion
|
50
|
Chapter
4
|
Practical
overview
|
51-77
|
4.1
|
Chemical Plant
|
52
|
4.1.1
|
Step-1 coagulation
|
51
|
4.1.2
|
Step-2 mechanical/sand filter
|
51
|
4.1.3
|
Step-3 caption exchanger
|
53
|
4.1.4
|
Step-4 Degasified/Decarbonizes
|
53
|
4.1.5
|
Step-5 Anion Exchanger
|
53
|
4.1.6
|
STEP-6 Mixed Bed Exchanger
|
54
|
4.2
|
Quality of De-Mineralized water
|
54
|
4.3
|
Different
types of measuring instrument
|
55
|
4.4
|
Condenser
|
56
|
4.5
|
Boiler
|
56
|
4.6
|
Boiler
Pipe Line
|
57
|
4.7
|
Furnace
|
57
|
4.8
|
Turbine
|
58
|
4.9
|
Bearing
|
58
|
4.10
|
Generator
|
59
|
4.11
|
Generator protection
|
60
|
4.12
|
Gas Turbine
|
60
|
4.13
|
Power Generation Efficiency
|
61
|
4.14
|
Heat Rate
|
62
|
4.15
|
Simulation Practical Lab
|
62
|
4.16
|
Transformer
|
63
|
4.16.1
|
Potential Transformer
|
63
|
4.16.2
|
Power Transformer
|
64
|
4.16.2.a
|
Radiator
|
65
|
4.16.2.b
|
Breather
|
66
|
4.16.2.c
|
Bushing
|
66
|
4.16.2.d
|
Current Transformer
|
66
|
4.16.3
|
Unit Transformer
|
67
|
4.17
|
Isolator
|
67
|
4.18
|
Power Circuit Breaker
|
68
|
4.18.1
|
Minimum Oil Circuit Breaker
|
68
|
4.18.2
|
SF6 Circuit Breaker
|
69
|
4.19
|
Earthling Switch
|
69
|
4.20
|
Lightning Arresters
|
70
|
4.20.1
|
Rod Gap Lightning Arrester
|
70
|
4.20.2
|
Horn
Gap Lightning Arrester
|
70
|
4.21
|
Relay
|
71
|
4.22
|
Bus
Bar
|
71
|
4.23
|
Insulator
|
72
|
4.23.1
|
Pin
Type Insulators
|
72
|
4.23.2
|
Suspension
Type Insulator
|
72
|
4.24
|
Transmission
Line
|
73
|
4.25
|
Wave
Trap
|
73
|
4.26
|
Control
Room
|
74
|
4.27
|
Cables
|
74
|
4.28
|
Feed
water and drum level control
|
75
|
4.29
|
Safety
valve
|
75
|
4.30
|
Pressure gauge
|
75
|
4.31
|
Flame detector
|
76
|
4.32
|
Air flow transmitter
|
76
|
4.33
|
Turbine over
temperature
|
76
|
4.34
|
Turbine over
speed
|
76
|
4.35
|
Low lube oil
pressure
|
77
|
4.36
|
Excessive
vibration
|
77
|
CHAPTER
5
|
Personal achievement
|
78-81
|
5.1
|
My
Achievement
|
79
|
CHAPTER
6
|
Conclusion
|
82-83
|
6.1
|
Problem
faced
|
83
|
6.2
|
Discussion
Day
Wise Visit
|
83
84-99
|
Reference
|
100
|
|
------------------------------------------------------------------------------
LIST
OF FIGURES
Figure
|
Figure
Caption
|
Page
|
2.1
|
Working
principal of steam turbine
|
24
|
2.2
|
Gas
Turbine electric power generation
|
31
|
2.3
|
Gas
burner connection and transition section
|
33
|
2.4
|
Gas-Steam Combine Cycle Power System Equipment
&Processing Flow Diagram.
|
36
|
3.1
|
Distribution
asset in national network
|
39
|
3.2
|
Intermediate
potential transformer
|
42
|
3.3
|
132KV
double circuit bus bar.
|
48
|
3.4
|
Pin
type insulator for 33KV line.
|
48
|
3.5
|
Pole
structure of transmission line.
|
49
|
4.1
|
Clarifier or Rectifier.
|
52
|
4.2
|
Mechanical/Sand Filter
|
52
|
4.3
|
cation exchanger
|
53
|
4.4
|
Degasifier / decarbonizes
|
53
|
4.5
|
Anion exchanger
|
55
|
4.6
|
Flow diagram of water treatment
|
55
|
4.7
|
Condenser of unit -4
|
56
|
4.8
|
pipe
line of boiler
|
57
|
4.9
|
Boiler
furnace unit 5
|
57
|
4.10
|
Blades
of steam turbine at unit 6
|
58
|
4.11
|
Bearing of steam turbine at unit 6.
|
58
|
4.12
|
practical view of generator at unit 6
|
59
|
4.13
|
inside view of stator at unit 6
|
59
|
4.14
|
practical
view of rotor at unit 6
|
59
|
4.15
|
gas turbine at combine cycle project of unit 7
|
60
|
4.16
|
unit -7 CCPP at GPS
|
60
|
4.17
|
Practical view of Combine cycle
generation process presented in block diagram.
|
61
|
4.18
|
simulation lab
|
62
|
4.19
|
generic Gas Turbine Simulator (1)
|
63
|
4.20
|
generic Gas Turbine Simulator (2)
|
63
|
4.21
|
Potential transformer with nameplate
of the GPS substation.
|
63
|
4.22
|
Tap changing power transformer.
|
65
|
4.23
|
Radiator of a power transformer.
|
65
|
4.24
|
Breather
of a power transformer
|
66
|
4.25
|
Bushing of power transformer.
|
66
|
4.26
|
Current transformer with nameplate of
the GPS substation.
|
66
|
4.27
|
Single phase unit transformer.
|
67
|
4.28
|
Horizontal center break isolator from
GPS.
|
67
|
4.29
|
Minimum oil CB.
|
68
|
4.30
|
SF6 circuit breaker
|
69
|
4.31
|
Earthling switch used in 132KV line
|
69
|
4.32
|
Rod gap type lightning arrester of
GPS.
|
70
|
4.33
|
Horn type of lightning arrester.
|
70
|
4.34
|
132KV double circuit bus bar.
|
71
|
4.35
|
Suspension type insulator observed
from GTC substation.
|
72
|
4.36
|
Sub-station of 230kv/132kv.
|
73
|
4.37
|
Wave trap used on GPS substation.
|
73
|
4.38
|
Rectifier
used for battery charging purpose.
|
74
|
5.1
|
Boiler
|
79
|
5.2
|
Turbine
|
80
|
5.3
|
Working
time
|
81
|
List
of tables
Table
|
Table caption
|
Page
|
Table
1.1
|
generation details of BPDB at
Ghorashal
|
21
|
Table
4.1
|
132 kV Single
phase outdoor type potential transformers.
|
73
|
Table
4.2
|
Insulters
voltage level with its number of disk
|
83
|
Table
4.3
|
Different Cables
Used at GPS Substation
|
86
|
---------------------------------------------------------------------------------
List of Abbreviations
GTC= Ghorashal training center
GPS= Ghorashal power station
BPDB=Bangladesh power development
board
CCPP = Combined Cycle Power Plant
CT = Current Transformer
PT = Potential Transformer
CB = Circuit Breaker
MW = Mega Watt
LPT = Low pressure turbine
IPT = Intermediate pressure turbine
HPT = High pressure turbine
ONAN = Oil Natural Air Natural,
without pumps and fans
ONAF = Oil Natural Air Forced,
without pumps for oil, with fans for air
--------------------------------------------------------------------------
ACKNOWLEDGEMENT
First of all, we give thanks to Allah.
Then we would like to take this opportunity to express our appreciation and
gratitude to our internship supervisor Engr
Shahid Jaman,
Lecturer & Coordinator (Evening) Department of EEE
for being dedicated in supporting, motivating and guiding us through this
internship. This internship can’t be done without his useful advice and helps.
Also thank you very much for giving us opportunity to choose this internship.
We also want
to convey our thankfulness to Prof. Dr.
Engr. Muhibul Haque Bhuyan, Chairman of the Department
of EEE for his help, support and
constant encouragement.
Apart from
that, we would like to thank our entire friends for sharing knowledge;
information and helping us in making this internship a success. Also thanks for lending us some
tools and equipment.
To our beloved
family, we want to give them our deepest love and gratitude for being very
supportive and also for their inspiration and encouragement during our studies in
this University.
--------------------------------------------------------------------------------------
ABSTRACT
This internship at Ghorashal Training Center (GTC)
located on the right bank of the river Shitalakshya from 8th January 2019 to 24th
January 2019 and this internship report is the result of those 15 days’
attachment with the GTC, Ghorashal power station owns the largest power station
in Bangladesh. The installed capacity by its 7 units is 1315 MW. My duration of stay was divided to work in
five sections as generator, sub-station, CCPP, I & C and operation. During
my internship I gathered practical knowledge about production of electricity,
operation, CCPP, major equipment’s e.g. Generator, Transformer and Switchgear
equipment’s required for distribution and protection of the system. Protection
and controlling of the equipment’s of the power station is a very important and
complicated task. With the help of the plant engineers I observed the control
room and protective equipment’s such as: relays (digital and electrical),
circuit breakers etc. very closely and understood the functions and controlling
system of those equipment’s. Substation is an important part of a power station
to distribute power and protection purpose. I acquired knowledge about various
types of transformers, bus-bars, circuit breakers (SF6 and Oil), lightning
arresters, CT, PT and other equipment’s of the substation which were clearly
taught and shown by the senior engineers of the substation of GPS. We learn
about the water management system for all power generating units of GTC. Inside
the report I describe about my experience at GTC.
---------------------------------------------------------------------------------------------------------
