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UNIVERSITY OF MORATUWA Faculty of Engineering Non-GPA Module EN3993 Industrial Training TRAINING REPORT DIMO (PVT) Limited Ceylon Electricity Board Lanka Electricity Company H.G.S.K PERERA 120463N Department of Electrical Engineering

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UNIVERSITY OF MORATUWA

Faculty of Engineering

Non-GPA Module EN3993 Industrial Training

TRAINING REPORT

DIMO (PVT) Limited

Ceylon Electricity Board

Lanka Electricity Company

H.G.S.K PERERA

120463N

Department of Electrical Engineering

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PREFACE

This report was prepared at the end of our Industrial Training period. To expose

ourselves to industrial environment, this training was a great opportunity. This industrial

training let us to apply the knowledge we gathered at the university and to gain some

experience about the industry and with society.

I have included my experiences, skills and practices I gained for 24 weeks duration

starting from 19th October 2015 to 08th April 2016 under electrical engineering field as an

electrical engineering undergraduate trainee of the University of Moratuwa at DIMO (PVT)

Ltd, Ceylon Electricity Board and Lanka Electricity Company (Pvt) Ltd.

The report consists of 3 major chapters. First chapter mainly includes Information

about Training Establishment with a brief introduction of each training places .Then First

chapter describes main functions, Organizational Structure and hierarchical levels, Present

Performance, Strengths, Weaknesses, profitability, Usefulness to Sri Lankan Society of each

training Establishments.

The second chapter describes daily entries in detail, it contains about the technical

experience and knowledge which I have gathered during my training period, in different

places in CEB and LECO. Also in there I have included many ELV designs involved in

DIMO and gathered knowledge and experiences while involved in those designs.

The third or final chapter includes the conclusion of the report. This conclusion

include an assessment on the current Industrial Program which coordinated by University Of

Moratuwa. There have summarized training experienced which I gained for 24 weeks within

Ceylon Electricity Board, Lanka Electricity Company (Pvt) Ltd and DIMO (Pvt) Ltd.

Perera H.G.S.K

Department of Electrical Engineering

University of Moratuwa

20 /04 /2016

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ACKNOWLEDGEMENT

Here my sincerely thanks go to the Industrial Training Division of University of

Moratuwa and National Apprentice & Industrial Training Authority (NAITA) for taking all

the necessary arrangements for making this training program a success and giving me this

opportunity to gain the in plant traineeships in Ceylon Electricity Board, Lanka Electricity

Company (Pvt) Ltd and DIMO (Pvt) Ltd. I would also like to thanks to our Training

Coordinator Dr. Udayanga Hemapala and Director of Industrial Training Division Eng.Plnr.

Ananda Gamage for their effort to make this training success.

I would like to express my gratitude towards all the Engineers, technicians, workers

and other staff of Ceylon Electricity Board in Kotmale Power Station, Sapugaskanda Thermal

Plant, Kelanithissa Combined Cycle Power Plant, Generation & transmission Planning

division, Transmission Operation and Maintenance (Colombo region), System Control

Centre, Veyangoda GSS for spending their valuable time and sharing their knowledge to

success my in plant traineeship.

Next I should convey my gratitude for who helped me in Lanka Electricity Company

(Pvt) Ltd, all the Engineers, technicians, workers and other staff of Kandana Customer

Service Centre, Kelaniya Branch Office, Operation Division, Engineering Division and

Ekala-Training Centre for enhancing my knowledge about electrical engineering field and

receiving necessary experiences and skills.

Next my special gratitude go to Mr Samantha Gunawardhana, General Manager of

DIMO (Pvt) Ltd. , Mr. Jagath Wickramasekara , Ms. Sayuri Sumithrarachchi, Mr. Ruwan

Dissanayake , Mr. Niranjan Botheju to help me to gain knowledge by share their experiences

with me when I was a trainee at DIMO (Pvt) Ltd.

I’m also thankful to my family, my colleagues and seniors and any other who helped

me for their guidance and support in many ways during the training period

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TABLE OF CONTENTS

1. INTRODUCTION ................................................................................................................. 1

1.1 DIMO Private Limited (Department of Building Technologies) ..................................... 1

1.1.1 Introduction ............................................................................................................... 1

1.1.2 Organization Structure ............................................................................................... 1

1.1.3 Present Performance .................................................................................................. 1

1.1.4 Strengths .................................................................................................................... 2

1.1.5 Weaknesses ................................................................................................................ 3

1.1.6 Opportunities for improvement ................................................................................. 3

1.1.7 Threats for survival .................................................................................................... 3

1.1.8 Profitability ................................................................................................................ 3

1.1.9 Suggestions to Improve performance ........................................................................ 3

1.2 Ceylon Electricity Board .................................................................................................. 4

1.2.1 Introduction ............................................................................................................... 4

1.2.2. Organizational structure ........................................................................................... 4

.2.1 3 Present Performance .................................................................................................. 4

1.2.4 Strengths .................................................................................................................... 5

1.2.5 Weaknesses ................................................................................................................ 5

1.2.6 Opportunities for improvement ................................................................................. 5

1.2.7 Threats for survival .................................................................................................... 5

1.2.8 Profitability ................................................................................................................ 5

1.2.9 Suggestions to Improve performance ........................................................................ 6

1.3 Lanka Electricity Company .............................................................................................. 6

1.3.1 Introduction ............................................................................................................... 6

1.3.2 Present Performance .................................................................................................. 6

1.3.3 Organizational Structure ............................................................................................ 6

1.3.4 Strengths .................................................................................................................... 6

1.3.5 Weaknesses ................................................................................................................ 7

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1.3.6 Opportunities of improvement................................................................................... 7

1.3.7 Threats for its survival ............................................................................................... 7

1.3.8 Profitability ................................................................................................................ 7

1.3.9 Suggestions to Improve performance ........................................................................ 7

2. TRAINING EXPERIENCE ................................................................................................... 8

2.1 DIMO Private Limited (Department of Building Technologies) ..................................... 8

2.1.2 Learnt Systems .......................................................................................................... 8

2.2 Ceylon Electricity Board ................................................................................................ 21

2.2.1 Hydro Power Generation – Kotmale Power station ................................................ 21

2.2.2 Generation (CEB) – Thermal Complex ................................................................... 29

2.2.3 Veyangoda Grid Substation ..................................................................................... 32

2.2.4 Transmission Operation and Maintenance .............................................................. 35

2.2.5 Generation and transmission planning .................................................................... 38

2.2.6 System Control Centre (SCC) ................................................................................. 39

2.3 Lanka Electricity Company (PVT) Ltd (LECO) ............................................................ 41

2.3.1 LECO Kandana Customer Service Centre (CSC) ................................................... 41

2.3.2 LECO Head Office .................................................................................................. 43

2.3.3 LECO Training centre ............................................................................................. 44

2.3.4 ANTE LECO Meter factory .................................................................................... 46

3. CONCLUSION .................................................................................................................... 47

ANNEX 01............................................................................................................................... 49

ANNEX 02............................................................................................................................... 50

ANNEX 03............................................................................................................................... 51

ANNEX 04............................................................................................................................... 52

ANNEX 05............................................................................................................................... 53

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LIST OF FIGURES

Figure 2. 1-CCTV Schematic for building 01 in waterfront project ....................................................... 8

Figure 2. 2 – Selection Interface Axis Design Tool .............................................................................. 12

Figure 2. 3 – Axis Design Tool Results ................................................................................................ 13

Figure 2. 4 – Access control system diagram ....................................................................................... 14

Figure 2. 5 – Video door phone system diagram .................................................................................. 15

Figure 2. 6 – Master Clock System ....................................................................................................... 16

Figure 2. 7 – AHU Schematic ............................................................................................................... 17

Figure 2. 8 – Chiller Schematic ............................................................................................................ 18

Figure 2. 9 – Basic fire panel diagram .................................................................................................. 20

Figure 2. 10 – Kotmale water flow ....................................................................................................... 22

Figure 2. 11 – MIV , Kotmale PS ......................................................................................................... 23

Figure 2. 12 – Kotmale excitation system diagram............................................................................... 24

Figure 2. 13 - Switchyard Kotmale PS ................................................................................................. 25

Figure 2. 14 – Surge arrestor ................................................................................................................. 26

Figure 2. 15 - CVT ................................................................................................................................ 26

Figure 2. 16 - CT ................................................................................................................................... 27

Figure 2. 17 – CB of Kotmale Switchyard ............................................................................................ 27

Figure 2. 18 - Replacing windings of the stator .................................................................................... 28

Figure 2. 19- Rotor of the unit 01 ......................................................................................................... 28

Figure 2. 20 - Removed winding .......................................................................................................... 29

Figure 2. 21 – Turbo Charger................................................................................................................ 31

Figure 2. 22 -Single Busbar with bus Sectionalizer ............................................................................. 33

Figure 2. 23 – Single Busbar ................................................................................................................. 33

Figure 2. 24 – Busbar ............................................................................................................................ 34

Figure 2. 25 - One and half bus bar ....................................................................................................... 34

Figure 2. 26 – Power Transformer Diagram ......................................................................................... 34

Figure 2. 27 - Double circuit Double earth ........................................................................................... 37

Figure 2. 28 - Single circuit Single earth .............................................................................................. 37

Figure 2. 29 - Double circuit single earth ............................................................................................. 38

Figure 2. 30 - Single circuit Double earth ............................................................................................. 38

Figure 2. 31 - Mahaweli Hydro Complex ............................................................................................. 40

Figure 2. 32 - Laxapana Hydro Complex ............................................................................................. 40

Figure 2. 33 - Net Metering Connection Diagram ................................................................................ 41

Figure 2. 34 – Single phase net meter ................................................................................................... 41

Figure 2. 35 - Large Angle .................................................................................................................... 41

Figure 2. 36 - Piercing Connector ......................................................................................................... 41

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Figure 2. 37 - Suspension Clamp .......................................................................................................... 42

Figure 2. 38 - DDLO- (Drop down Lift Off) ........................................................................................ 42

Figure 2. 39 - FDS ( Feeder Disconnect Switch) .................................................................................. 42

Figure 2. 40 - A Section of the mimic board ........................................................................................ 43

Figure 2. 41 - LBS arrangement............................................................................................................ 44

Figure 2. 42 - Inside of Distribution Transformer................................................................................. 44

Figure 2. 43 - Testing bench used to testing meters .............................................................................. 45

Figure 2. 44 – Oil Tester ....................................................................................................................... 45

Figure 2. 45 - Electro Mechanical meter ............................................................................................... 46

Figure 2. 46 - Inside of electronic meter ............................................................................................... 46

LIST OF TABLES

Table 1. 1 – Ongoing Projects DIMO BT ............................................................................................... 2

Table 2. 1 – Required resolution levels to survailience ........................................................................ 10

Table 2. 2 – IP Standards Table ............................................................................................................ 11

Table 2. 3 – IK Standards Table ........................................................................................................... 12

Table 2. 4 – Example Point List ............................................................................................................ 19

Table 2. 5 – CEB Training Schedule .................................................................................................... 21

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1. INTRODUCTION

1.1 DIMO Private Limited (Department of Building Technologies)

1.1.1 Introduction

DIMO (Private) Limited is one of a main solution provider for building

technologies, under its building technologies department. DIMO (Private) Limited is a

part of Diesel and Motor Engineering PLC which is a large company in Sri Lanka.

DIMO (Private) Limited is established in year 1980 under the mother company to

provide industrial solutions such as Electro mechanical, Bio medical & Marine

Engineering.

1.1.2 Organization Structure

Organization structure of DIMO BT is shown in ANNEX 01

1.1.3 Present Performance

In the time I trained at DIMO B.T (Building Technologies) there are

some ongoing projects of BMS Systems, CCTV Systems and Fire detection And

Protection Systems. Table 1.1 shows the ongoing projects of DIMO B.T on the date

of 2016-01-08

Project Name Description

Sheraton Hotel, Colombo 3 Supply, Installation, Testing and Commissioning of Building

Management System

Supply, Installation, Testing and Commissioning of CCTV

System

Defense Headquarters Complex -

Block 06

Supply, Installation, Testing and Commissioning of Building

Management System

Movenpick Hotel, Colombo Supply, Installation, Testing and Commissioning of Building

Management System

Treasury Building Supply, Installation, Testing and Commissioning of CCTV

System

Fairway Galle Design ,Supply , Installation , testing and Commissioning of

Fire Detection, Fire Protection & Sprinkler System

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They also bidding to new projects, I also got several chances to help to prepare several

bidding documents.

1.1.4 Strengths

In DIMO B.T the main Strength of them is the quality and reliability of their designs

done by a well-trained Engineers and technical staff. DIMO B.T always trying to keep the

quality and reliability of their products and stay up to date with the new technology

prevailing in the world.

They are using SIEMENS Products for their BMS Designs which is a world

class brand for BMS products origins from Germany. For CCTV systems they are using

mainly AXIS (From Axis Communications, Sweden.) , BOSCH (From Germany) And

SONY (From Japan) products. And for Fire Protection Systems they are using BOSCH

products and all of above mentioned products are well known quality products in worldwide.

DIMO also holds the ISO9001 and ISO14001 Certifications for their quality of

products.

SLT Cable Landing Station Supply , Installation ,testing and Commissioning of Fire

Detection & Fire Suppression System

Moven Pick Hotel Supply , Installation ,testing and Commissioning of Fire

Detection System

Western Provincial Council Supply , Installation ,testing and Commissioning of Fire

Detection, Fire Protection & Sprinkler System

Riverina Hotel

Beruwala

Design , Supply , Installation ,testing and Commissioning of

Fire Detection & Fire Protection System

MAGA Head Office Design , Supply , Installation ,testing and Commissioning of

Fire Detection, Fire Protection & Sprinkler System

Clear Point Residencies

Rajagiriya

Design , Supply , Installation ,testing and Commissioning of

Fire Detection, Fire Protection & Sprinkler System

Fairway City Hotel Colombo 01 Design , Supply , Installation ,testing and Commissioning of

Fire Detection, Fire Protection & Sprinkler System

Treasury Building Supply , Installation ,testing and Commissioning of Fire

Detection & Fire Protection System

Table 1. 1 – Ongoing Projects DIMO BT

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1.1.5 Weaknesses

This Company is not getting expected profit from their projects due to some

management issues. And sometimes they failed to get big projects which gives good profits

because most of the bidding values are too high from other competitors. The main reason is

there are more Chinese and less quality products in the market nowadays. And DIMO BT

have to use only Siemens Products for their BMS projects under an agreement between

Siemens and DIMO Which is with good quality and high price, but most of customers are

expecting a less prices then the quality of the product. The work load on the design engineers

and project engineers is also high so sometimes the designed thing will not be the optimum

solution.

1.1.6 Opportunities for improvement

Recently building automation, Security systems like CCTV, Access control Systems

are becoming popular in Sri Lanka. And there are many customers demanding for high

quality products and because of DIMO BTs Reputation for supplying quality products. There

is a good opportunity for BT department to increase their sales by focusing on new projects.

1.1.7 Threats for survival

There is big competition of the market for CCTV and Building automation Systems

that is the biggest problem DIMO has. The main Competitors are Shin Nippon, Hayles, and

in the other hand there are many Chinese brands in market for very low cost and DIMO has

to Import every equipment so the project could be delayed if the shipment didn’t arrive in

expected time.

1.1.8 Profitability

The profitability of the DIMO is the attraction of the customers due to their reliable

and quality products. Also their technical solution partners are worldwide recognized brands.

Also the ELV industry recently came up with the development of the country and the

Demand is considerable than the past.

1.1.9 Suggestions to Improve performance

Main Suggestion is the DIMO BT needs more engineers as design engineers so their

work load is reduced and they can find optimum solutions for projects. DIMO also needs to

diversify their products they only implementing products from SIEMENS in their Building

Automation Solutions if they have more suppliers they can satisfy customers’ needs easily

and they can implement budgetary projects.

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1.2 Ceylon Electricity Board

1.2.1 Introduction

Ceylon Electricity Board (CEB) is established in Sri Lanka on the 1st November 1969.

It is empowered to Generation, Transmission and the Distribution of the Electrical Energy to

different categories of consumers in Sri Lanka and to collect the revenue. Currently the aim of

the Ceylon Electricity Board is to provide a high quality and affordable service to its customers.

Currently CEB serves approximately 98% of the public with wider network across the country.

Vision of the CEB is “Enrich life through power”. And their mission is “to develop and

maintain an efficient, coordinated and economical system of electricity supply to the whole of

Sri Lanka, while adhering to our core values”.

Safety

Service to the nation

Efficiency and effectiveness

Commitment

Quality

Professionalism

Sustainability

1.2.2. Organizational structure

Organizational structure of the Ceylon electricity board is in the ANNEX 02.

1.2.3 Present Performance

Present Performance of the CEB is divided into main three parts Generation,

Transmission and Distribution. Most of the generation plants in Sri Lanka is owned by the

CEB and this generation is done mainly by Hydro and Thermal power plants and CEB is

getting NCRE (Non-Conventional Renewable Energy) sources such as Solar and Wind

Power.

In Sri Lanka Transmission Network CEB uses 132kV and 220kV lines to empower the entire

country. To distribution of electricity CEB has divided the country into four regions.

Division 1: Colombo City, North Western, North Central and Northern provinces

Division 2: Western-North, Central and Eastern provinces

Division 3: Western south (some parts), Uva and Sabaragamuwa province

Division 4: Western south (other parts) and Southern province

To distribute electricity CEB uses 400V lines.

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1.2.4 Strengths

CEB is a government organization it is the main strength of the CEB. Another major

strength is CEB holds monopoly in the power sector so they don’t have any competitor in the

market. CEB also have well experienced, qualified professional staff with expert engineers

and specialist technicians.

1.2.5 Weaknesses

In CEB the efficiency is went down and some works are ineffective due to inability of

the workers. Electrical Engineers are doing their job mostly only to get paid. Majority of

workers are not able to do their work in time and effectively. This is the major problem in the

CEB. The main reason for this is the political influence. CEB is lacking of new ideas and new

inventions.

1.2.6 Opportunities for improvement

CEB is building new coal power plants in Trincomalee and Sampoor, Coal is the

cheapest power generation method affordable to a country like Sri Lanka. And Dendro plants

and Green Energy is coming up in Sri Lanka.

In market side consumers are increasing day by day and CEB has a monopoly market.

Also workers are eager to join with the CEB because of the reputation of the CEB

1.2.7 Threats for survival

In CEB projects fund are delaying, planned projects does not start required time , Oil

price is fluctuate over the time and tariff structure if not cost reflective therefore CEB is

making losses and have to face unexpected situations.

Hydropower generation is becoming limiting in Sri Lanka, Hydropower is a major

thing in power generation in Sri Lanka because there are no Thermal power station which is

capable to control the system frequency so CEB should have to think about that. And when

considering coal power generation it will cause a major Environmental issue one day and coal

sources will also last for few more years only so CEB needs to focus on new power

generation methods.

1.2.8 Profitability

CEB not only focusing on making profits they mainly focused on providing quality

and reliable supply to the country. CEB works under government policies. To maintain

reliable and quality supply CEB making losses every day in Millions.

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1.2.9 Suggestions to Improve performance

CEB is a major part of country’s economy, development and human life. Without

electricity it will be difficult. CEB provides high quality reliable power supply for desirable

tariff structure. But CEBs loss is high compared to their revenue so they have to work on

techniques to reduce their losses. CEB have to work on new researches on renewable energy

and new methods to improve quality and reliability of the supply. I think to do that they have

to improve their research and development facilities. CEB works on programs to aware

people to reduce the peak demand of the country.

1.3 Lanka Electricity Company

1.3.1 Introduction

Lanka Electricity Company (LECO) is established in year 1983 for distribution of

electricity. LECO is responsible for distribution electricity in western coastal area and their

branches are located at Negombo, Kelaniya, Kotte, Nugegoda , Moratuwa , Kaluthara and

Galle. They are buying electricity from CEB and distribute it among consumers and

collecting the revenue. Their main purpose is the reduce distribution losses.

1.3.2 Present Performance

To reduce the lost LECO is distributing electricity under concept “More transformer

shorter feeder length” therefore the can reduce the loss acceptable level and the LECO was

the first to introduce the All Bundle Conductors (ABC) for power distribution. In several

places they also used bundled conductors for 11kV lines also.

1.3.3 Organizational Structure

Organization structure of LECO is given in ANNEX 03

1.3.4 Strengths

LECO got experienced and skilled engineers and technical staff and they are working

hard for fulfil company goal and maintain reliability and quality of their distribution network.

They responds to consumer problems very fast and provide solutions. To repair their

transformers they got a transformer workshop. Efficiency of LECO is at considerably good

level because they are reducing their losses and they are using new technologies in

distribution systems.

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1.3.5 Weaknesses

The distribution area is limited and therefore they have to strict same areas without

expanding the distribution network. Due to this reason they have to get profits from reducing

losses. Another main weakness is the lack of man power in depots so the working staff of

depots are not happy due to heavy work load. LECO have to buy the electricity from CEB

and therefore they have to depend on the supply of the CEB.

1.3.6 Opportunities of improvement

Mostly the distribution network of LECO is spread through urban areas so they have

good demand and they can have good profit from distribution. LECO is doing many

researches for improve the efficiency of their distribution. Nowadays they are implementing

smart meters and doing projects to operate switches from remote places. LECO has done a

project on efficient street lightings to reduce energy loss in street lighting.

1.3.7 Threats for its survival

LECO is restricted to limited area in distribution of electricity therefore they can’t

extend their network. If there is an issue with transmission network of CEB then LECO have

to wait until CEB fixes the supply.

1.3.8 Profitability

The main goal of the LECO is their reducing of losses when distributing electricity

they have managed to limit the losses about to 5%. Thus the LECO is getting profits by

achieving their goal.

1.3.9 Suggestions to Improve performance

LECO is reduced the distribution loss approximately to the 5% so their efficiency is at

very good level in distribution. They are doing researches to improve quality of their supply.

By promoting new technologies like net metering and smart metering LECO can reach

maximum efficiency because with smart metering no one needs to go to consumers doorsteps

and read the energy meter.

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2. TRAINING EXPERIENCE

2.1 DIMO Private Limited (Department of Building Technologies)

I trained at building technologies department of DIMO (PVT) Limited for a period of

12 weeks. During this 12 weeks I got lot of experience in ELV (Extra Low Voltage) Industry.

I got experience on several project designs and learnt to choose suitable equipment as

requested by the clients and learnt the preparation of bid documents as expected by the client.

2.1.2 Learnt Systems

2.1.2.1 IP CCTV Systems

In CCTV systems there are two main types Analogue CCTV and IP CCTV. IP

System is the upcoming technology in CCTV systems in DIMO BT almost all the CCTV

projects are designed under IP system.

In IP CCTV systems they are using LAN (Local Area Network) to connect each

CCTV camera to the servers. We can use the same LAN we use to connect to the internet in

this, but for reliability of the system we are using separate LAN network and this network is

connected to the internet. Following figure (Figure 01) shows a diagram for CCTV system

which was created by me for a presentation in DIMO BT. In this design we used AXIS brand

which is mostly used by DIMO.

Figure 2. 1-CCTV Schematic for building 01 in waterfront project

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All equipment are connected to the local area network and the captured data form the

cameras are live displayed from monitoring displays Monitor wall workstations are used to

manage the each displays and send the camera control signals ( For PTZ Cameras ). The

management server is used to control all the other servers included in the system and a

failover server for the management server is included if any failure happened in the

management server this management server failover automatically takes the control. To

manage the recordings and storages there is a server called Video Record Management

Server (VRMS) and also for analytics which is used for reduce the vast information contained

in videos and to reduce storage (Motion Detection, Digital auto tracking, tempering alarms

for cameras, audio detection) there is a separate server called Video Analytic Server (VAS)

and for VRMS and VAS there is a common failover server to take care about failures of

above two servers. All of these workstations and servers are managed by Software AXIS

Camera Companion.

2.1.2.1.1 Types of IP cameras

These cameras are categorized in terms of the environment which is camera is

designed for, if it’s a indoor camera the camera can only be used indoor only. But if the

camera is outdoor camera the camera can be used in both indoor and outdoor. And again this

cameras are again classified into fixed, fixed dome and PTZ (cameras which have Pan Tilt

Zoom Functions).

2.1.2.1.2 Selection of camera

When selecting a camera first we have to refer the required specifications mentioned

by the client. Then the selection should be done according to the needs of the client. The

following specification should be considered mainly when selecting a appropriate camera for

a client’s application.

Indoor / Outdoor

Max. Resolution

Audio support

Compression format (Generally .mp4)

Power (Normally IP cameras powered with PoE)

Vandal Resistance (Resistant to impacts)

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Image sensor details

IP class of the camera

Frame rate

Resolution of a camera is a main point when we talks about security surveillance so the

resolution level should be as following table 2.1

Operational requirement Pixels / inch reqired

Identification 12.5 px /in

Recognition 6.3 px/in

Detection .6 px/in

Table 2. 1 – Required resolution levels to surveillance

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Table 2. 2 – IP Standards Table

When a camera used for outdoor application the IP rating of the housing of camera

should be considered. This IP rating is a standard which defines the ability to withstand

against water and solid particles for a housing of an equipment. Table 2.2 shows the IP

ratings

Ability of withstand impacts on the housing of an equipment is denoted by IK ratings,

following Table 2.3 shows s standard IK rating Chart.

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Table 2. 3 – IK Standards Table

2.1.2.1.3 Selecting suitable storage devices for cameras

Figure 2. 2 – Selection Interface Axis Design Tool

I choose required storage sizes for above selected cameras (mentioned in figure 2.1)

using axis design tool, it is an online tool that we can specify the selected camera, scene

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mode, frame rate video encoding and etc. ( Figure 2.2) Then this tool calculates the required

storage for each selected camera.( Figure 2.3)

Figure 2. 3 – Axis Design Tool Results

2.1.2.2 Access Control System

Access control systems are used to areas which needs to secure from unauthorized

accesses. Typical Access control system consists of Electromagnetic lock, Reader for

authentication, Exit push button and controller. These readers have several types.

Bar Code Readers: These types of readers reads the data printed on card as

Bar code or a QR code.

Proximity Card reader : in this types of readers user has to swipe or get

closer the card to reader in this readers RFID ( Radio Frequency Identification

) technology is used.

Biometric readers: In these type of readers reader detects the fingerprint or

face of a person, in few countries eye detection is also used.

In following figure 2.4 shows the schematic of access control system of Waterfront project,

Building 02 which was created by me for a presentation.

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In this system each of access control unit ( one door ) is controlled by the local

unit controller all of these unit controllers are connected to one unit called unit

controller and this unit controller is connected to LAN and all the monitoring and

controlling can be done with this server. For this system the card reader is a proximity

reader which uses the RFID technology.

Door contact is used to get the status of the door (whether the door is opened

or closed) and when the user swaps the right card through the reader local unit

controller gives the open signal to the electric lock. Pressure button is used to

manually open the lock from the inside.

Figure 2. 4 – Access control system diagram

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2.1.2.3 Video door phone system

This is a latest system rises up to control access into apartments of the building

from one place (Security room). As an example assume there is an apartment complex

with 10 residences and a security room for prevent access of unwanted persons.

For each residence there is one video unit with a display, and in security room

there is device called entrance station, with a keypad and a camera, when a person

needs to enter to the complex he has to dial the particular number on the entrance

station of the residence he needs to go. Then the owner of that residence can see him

through the camera and he can grant access through video unit when the owner

granted access main door lock opens automatically and the person can enter to the

complex now. And there is a separate phone for security room to communicate with

each of residence. Al the control is done by the control unit and all the video units are

connected to the control unit via a video distributor. Normally there is one video

distributor per each floor. In following figure 2.5 shows a video door phone system

schematic designed for waterfront project building 4. For that design equipment from

Aiphone brand are used.

Figure 2. 5 – Video door phone system diagram

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2.1.2.4 Master Clock System

I got a chance to work on designing a Master Clock System for Nawaloka Hospital.

The schematic of Master Clock System drawn by me is shown in figure 2.6.

Figure 2. 6 – Master Clock System

In master clock system we can adjust the time of several clocks from one place. All the

clocks are synchronized using Network time protocol Server (NTP Server). These clocks are

connected through Ethernet connection.

2.1.2.5 Building Management System (BMS)

BMS is a control system based on computer based controllers used in buildings to

controlling and monitoring the electrical and mechanical systems in the building. Under BMS

we can control Heat Ventilation and Air Conditioning Systems (HVAC) and above

mentioned systems CCTV, Access control systems etc. in DIMO BT I learnt about HVAC

under the BMS.

The purpose of using BMS is manage the energy consumption for above systems and

to take maximum efficiency and to reduce the manual operation of those systems.

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2.1.2.5.1 Heat ventilation air conditioning system

The purpose of HVAC systems is to control the temperature and humidity of the air

volume inside a space. There are two main systems inside a HVAC systems.

Air handling system

Chilled water management system

To handle air inside smaller area (room) we can use Fan coil unit (FCU) and to handle air in

larger area (big hall or several rooms) we can use Air Handling Unit (AHU).

2.1.2.5.1.1 Air handling unit

Conditioning of intake air is done by using air handling unit. To do this conditioning

it has several dampers to control intake / exhaust air volumes, mixing box, cooling coil,

filters, fans for exhaust and intake. To get the status of air and status of AHU several sensors

are placed.

The supply air leaves to the space we have to air conditioned. And this air absorbs the

heat from the space and through the return duct this air again taken into the AHU by sensing

the CO2 percentage of return air the exhaust and fresh air dampers are controlled. Return air

and the fresh air mixed at the mixing chamber and goes through several filters, cooling coil

and cools down. This cooled air leaves the AHU as Supply air. This cycle is repeating inside

the AHU. A schematic for AHU is give in figure 2.7

Figure 2. 7 – AHU Schematic

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2.1.2.5.1.2 Chiller

Chiller pumps the chilled water into the AHU or FCU s. the chilled water goes

through the cooling coil and absorbs the heat rom return air. This chilled water return again to

the chiller’s heat exchanger and again chilled water is supplied into the AHU. In figure 2.8

shows a basic schematic of chiller operation.

Figure 2. 8 – Chiller Schematic

Mainly the chilled water circulation in AHU side is done by the Chilled water

primary pump but we can use secondary pump also to support this circulation. The bypass

valve is used to balance the pressure of Chilled water supply and Chilled water return.

2.1.2.5.1.3 Direct Digital Controllers (DDC)

All the controlling of BMS is done by programmed DDCs. It is a microprocessor

based controller. It can take several inputs (Digital or Analog) and produce several outputs

(Digital or Analog) based on the input and the programmed algorithm to control the BMS.

These digital/analog inputs and outputs are defined as points.

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DO (Digital Output): This gives digital output (high or low) to the instrument

generally these kind of outputs are given to the relays when controller sets the

high value relay turns on and for the low value relay turns off.

DI (Digital Input): From this controller gets a status of instrument (On / off

status of Open / Closed status) these kind of inputs are taken from flow

switches, pressure switches, level switches.

AO (Analog Output): This is a variable voltage signal given by the DDC to

control an instrument. This type of signal is used to control the speed of a

motor, control the position of damper.

AI (Analog Input): This is a variable voltage output signal received by the

DDC to identify status of environment or instrument. As an example

temperature, humidity, CO2 level, pressure are taken as Analog inputs.

These points are further categorized into two types as dry contacts and wet contacts, in dry

contacts external power supply should be given to work of the sensor.

2.1.2.5.1.4 Point list

Point list is a list which includes all the points in the BMS. Point list is given by the

client to the contractor so he can design the system as required specification. Table 2.4 shows

an example for a point list.

Table 2. 4 – Example Point List

2.1.2.6 Fire Detection System

Fire detection systems is done in separate section in DIMO BT department. One day I

got a chance to study about Fire Detection systems. The task given to me was to compare fire

Description DI DO AI AO

CEB HT Incoming C.B Status 1

CEB HT Incoming C.B Alarm (Trip) 1

HT Outgoing C.B T/F-01 & 02 Status

3

HT Outgoing C.B T/F-01 & 02 Alarm 3

Main Circuit breaker Status (2Nor of 3000A)

3

Main Circuit breaker Alarm (2Nor of 3000A)

3

CB (Critical Load Panel 01) Status 2

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control panels from BOSCH and from local supplier. The basic schematic for fire detection

system was given in figure 2.9

Figure 2. 9 – Basic fire panel diagram

In here each detection device / manual call point was given an address and the address

was recorded with the location of the detector / manual call point if the detector activates of

manual call point activates the panel shows the location of the fire and there is sprinkle

system attached to this. The respective sprinkle is turns on after the detection of the fire.

Closed system

In closed system the detection device and the control panel should be in same brand.

in here the communication is done by special specific protocol for that brand.

Open System

In open system there is no special protocol and the common protocol is used to communicate

so we can use any brands to panel and to detection devices.

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2.2 Ceylon Electricity Board

I got chance to learn the way of using theories practically which we learnt from

university. I trained under Transmission and Generation Sections in CEB. During this period

I was able to get familiar with equipment, operations, maintenance work of CEB. Our group

was given a training schedule as in table 2.3.

Training

Establishment

Training Place Period

From To

Hydro Power

Generation Kotmale Power Station 2016-02-01 2016-02-12

Generation (CEB)

Thermal Power

Station

Kelanitissa Power Station 2016-02-15 2016-0219

Sapugaskanda power

station 2016-02-22 2016-02-26

Transmission

Veyangoda grid

substation 2016-02-29 2016-03-04

Hot line maintenance 2016-03-08 2016-03-11

Planning

Generation &

Transmission Planning

Division

2016-03-14 2016-03-18

Operation System Control Centre 2016-03-21 2016-03-24

Table 2. 5 – CEB Training Schedule

2.2.1 Hydro Power Generation – Kotmale Power station

Our group was assigned to the Kotmale power station. From there I learnt lot of things

about hydro power and the operation of the Kotmale power station. And our group got a

chance to observe a stator winding repairing of the unit 01 stator done by foreign engineer.

Kotmale PS is the first underground power station in Sri Lanka.

Kotmale PS is commissioned in year 1985 and the installed capacity is 201MW ( 3 x

67MW) . For electricity generation water is taken from kotmale oya which is a main affluent

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of Mahaweli Ganga. This is second largest hydro power plant in Sri Lanka and this power

plant has the ability of frequency controlling.

2.2.1.1 Details of Kotmale Power Station

In kotmale reservoir the catchment area is about 544km2. The water level of the

reservoir is about 702m – 703m from MSL. And the power station can be operated until the

water level become 665m from MSL. The total storage of the reservoir is about 176x106 m3.

Figure 2.10 shows the water flow of the kotmale power station.

Figure 2. 10 – Kotmale water flow

2.2.1.2 Generator details

In kotmale power station there are 3 generators with max power output of 67MW the

operating head is 226m and the type of the turbine is Francis (vertical axis) type. Rating of

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the generator 900MVA, .85 p.f. the generator output voltage is 13.8kV. this generator uses

brushless type excitation system.

2.2.1.3 Water flow

The high pressure tunnel is made out of steel to withstand the high pressure of the

water inside the tunnel. The low pressure tunnel is about 7km long and the water pressure is

low in this tunnel than the high pressure tunnel. The water flows to the turbine through the

main inlet valve (MIV) this valve is rotary type valve. There are two seals named service seal

and maintenance seal in two sides of this valve service seal is used in every opening and

closing o the valve to rotate the turbine and the maintenance seal is operated to repairing or

inspection of the service seal.in figure 2.11 the view from the spiral casing of the MIV is

shown.

Figure 2. 11 – MIV, Kotmale PS

The water enters to the turbine from MIV to the spiral casing and to the wicket

gates (24 gates) these wicket gates are used to control the water flow into the turbine the

turbine has 17 turbine blades. This turbine rotates at speed of 375 rpm.

After rotates the turbine water flows through draft tube which has a conical shape.

Then the water enters to the downstream surge chamber and after finally water flow outside

through the tail race.

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2.2.1.4 Excitation System of generator.

In generator units brushless excitation system is used to excite the generator. Initially

220V DC supply is given to the AVR from auxiliary supply. After generator speed reaches

about 275rpm the 220V DC supply is taken from directly from the generator output voltage.

Schematic of the excitation system is given in figure 2.12. From this system we can control

the reactive power by controlling the excitation voltage of inverter.( Adjusting the firing

angle of the inverter)

Power Out

Generator

Breaker

Generator

Figure 2. 12 – Kotmale excitation system diagram

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2.2.1.5 Governor

Governor is used to control the active power output of the generator. This is

done by controlling the water flow into the turbine. There are 24 wicket gates around the

turbine these wicket gates are controlled by the governor using hydraulic system.

2.2.1.6 Switch yard of Kotmale PS

In kotmale power station there is a 132kV/220kV switchyard. There are six bays in

the switchyard. In figure 2.13 shows a view of the switchyard.

Figure 2. 13 - Switchyard Kotmale PS

Bay 01 – Anuradhapura 1 and Victoria 1

Bay 02 – Anuradhapura 2 and Victoria 2

Bay 03 – Upper kotmale 1 and unit 01 output

Bay 04 – Upper kotmale 2 and unit 02 output

Bay 05 – Biyagama 1 and unit 03 output

Bay 06 – Biyagama 2

Switchyard components are briefly explained bellow.

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2.2.1.6.1 Surge arrestor

Figure 2. 14 – Surge arrestor

In figure 2.14 show a picture of surge arrestor. This component is used to protect the

insulations and equipment from lightning surges or switching surges. These arrestors

diverting the surge current to the earth in a case of surge.

2.2.1.6.2 Earth switches

These earth switches are operated for isolated sections when there is maintenance for

protection of people.

2.2.1.6.3 Capacitor Voltage Transformers (CVT)

CVTs are used for measuring purpose. The reason to choose CVTs other than VTs is l

using VTs for measure high voltages is not economical. These CVTs can be used to

communicate using power line career method when combined with wave traps.in figure 2.15

shows a picture of CVT.

Figure 2. 15 - CVT

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2.2.1.6.4 Current Transformers

Current transformers are also used for measurement purpose. This transformer

converts the line currents to small current values to measure. The converted value is directly

proportional to the real value. Following figure 2.16 shows a current transformer.

Figure 2. 16 - CT

2.2.1.6.5 Circuit Breakers (CB)

CB is operated automatically under detection of faults the faults are detected with the

help of CTs CVTs and relays. It protect the system from damages caused by overloading and

short circuit conditions.There are CBs use minimum oil and SF6 as insulation. The figure

2.17 shows a CB.

Figure 2. 17 – CB of Kotmale Switchyard

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2.2.1.6.6 Power Transformers

In kotmale switchyard there are three single phase bank type transformers for each

unit. Rated power of each bank is 20MVA/30MVA. Cooling method is ONAN /ONAF .

Rated voltage is 13.8kV/220kV. Vector group is YNd11.

2.2.1.6.7 Earthing transformers

This transformers are used to get auxiliary supply and as a protection for fault

currents. The rated power is 1.6MVA and the cooling method is ONAN. Rated voltage is

13.8kV/11kV. the vector group is ZNyn11.

2.2.1.7 Repairing of Stator Winding at unit 01

Our group got a chance to observe a repairing of stator winding of unit 01. We

got a chance to observe the rotor, inside of spiral cage, inside of draft tube. The damaged

winding was replaced by foreign engineer.

Figure 2. 19- Rotor of the unit 01 Figure 2. 18 - Replacing

windings of the stator

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2.2.1.7 Nillambe Power station

This is a mini hydro power plant in mahaweli complex which is under the kotmale PS.

The generation is 3.2MW. in Nillambe PS Francis (Horizontal axis) type turbines are used.

There are two generator units each of 1.6MW capacity. The operating head is 110m.

2.2.2 Generation (CEB) – Thermal Complex

2.2.2.1 Kelanitissa Combined Cycle Power Station (KCCPS)

In KCCPS there are two power generator units. Gas Turbine and Steam Turbine

which gives total of 165MW. From gas turbine 110MW and from steam turbine 55MW

(50MW from High pressure turbine and 5MW from Low pressure turbine). The fuel used in

KCCP are Naphtha and Diesel.

Gas turbine is started with Diesel and when the power output reaches 40MW, the

running fuel is changed to Naphtha. When shutting down the GT again the running fuel is

changed into Diesel to avoid naphtha being stuck inside the GT .The GT has 14 combustion

chambers. Exhaust gas temperature from gas turbine is about 560oC . This exhaust gas is used

to heat water and produce steam for Steam turbine. KCCPS can run in simple cycle mode or

Figure 2. 20 - Removed winding

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in combined cycle mode. To produce steam needs to rotate the ST the Heat Recovery Steam

Generator (HRSG) is used.

GT is operating at 3000rpm, Steam turbine (HP) is operating at 9420 rpm and the

Steam turbine (LP) is operating at 3000rpm. The output voltage of GT is 15kV for ST the

output voltage is 11.5kV.the schematic of KCCPS is given in ANNEX 04

2.2.2.1.1 Heat Recovery Steam Generator (H.R.S.G)

This unit heats the water using four coils. Condenser, low pressure economizer,

evaporator and super heater. The main function of the HRSG unit is to recover heat energy

from the exhaust gas of GT. This produces High pressure steam and Low pressure steam.

First the water flows through the economizer. Then the created steam is flows to the

steam drum. Then the water at the bottom of the steam drum flows through the evaporator.

Then this water become steam and again this steam flows to the steam drum. This steam

drum is heated through the super heater.

High pressure superheated steam has temperature of 5110C and has a pressure of

70bars. Low pressure super-heated steam has temperature of 2170C and has a pressure of

5.5bars.

2.2.2.2 Sapugaskanda Diesel Power Station

In Sapugaskanda diesel power plant the electricity is generated by using diesel

engines. These engines work as prime movers of the generators. In Sapugaskanda PS there

are two stations, Station A and Station B. the fuel used are Diesel and Heavy fuel.

In station A there are 4 x 20MW generators installed but currently the running

capacity is 3 x 16MW + 1 x 18MW. The speed is 428rpm in these machines. The engine type

of station A is 18 Cylinder V type. The generation cost per unit is about 19.50LKR.

In station B there are 8 x 10MW generators are installed but the running capacity is 8

x 9MW. The speed is 428rpm on these machines. The engine type of section B is 8 cylinder

Inline type. The generation cost per unit is about 17.50LKR.

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In both stations there are 14 poles and the rotor type is salient pole rotor. To get air for

combustion in engines turbo chargers are used. Using exhaust gas turbo charger rotates a

compressor and take fresh air in inlet. Figure 2.21 shows simple schematic of turbo charger.

Figure 2. 21 – Turbo Charger

2.2.2.2.1 Starting process of engines

Station B

All the engines are operated at 9MW, 5MVAr and running speed is 428rpm.

When starting diesel is used and the running fuel is changed to HFO when following

conditions are satisfied.

Load reaches 3 MW

Ring main heavy fuel temperature above 700C

Cylinder cooling water temperature above 700C

Booster pumps are used to pressurize oil from 3.5bar to 5bar. When an engine is

starting after stopped more than two hours. Following things has to be done when

starting.

Barring – flush out any stuck lubricant, water or air by rotating two

revolutions with valve open.

Blowing – applying high pressure until machine reaches 70rpm.

Ignition – ignition is automatically done at 90rpm.

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Loading of station B is done 1MW per 1.5minutes. and the de loading the machines at 1MW

per 1 minute. When de loading the machine at 7MW fuel is changed back to diesel. And

running for 45minutes to flush out HFO inside the engine.

Station A

Operating speed of engines is 428rpm.Engine 1,2,3 can produce 16MW max active

power output and engine 4 produces 18MW max output. And the machines can provide

reactive power up to 10MVAr.

When starting diesel is used and the running fuel is changed to HFO(Heavy Fuel Oil).

When reaches to following conditions.

Load is about 40%

Ring main Heavy fuel temperature above 700C

Cylinder cooling temperature above 690C

Jacket, injector and lube oil cooling is done with cooling water system. The machines

in Station A are loaded 1MW per 1minute. The engine 1 and engine 3 is connected with SUT

01 and, engine 2 and 4 are connected with SUT 02. The excitation system is Permanent

Magnet Generator (PMG)

2.2.3 Veyangoda Grid Substation

Veyangoda grid substation consists of both 220kV and 132kV transmission voltages

and 33kV sub transmission Voltage. But for 132kV there is only a bus bar and tin future there

will be a 132kV line.

There are four incoming 220kV transmission lines, two from new chillaw and two

from kotugoda. This four incoming lines are connected with 220kV bus bar 1 and 220kV Bus

bar 2. This two bus bars are connected with two 150MVA transformers and the 220kV is

stepped down to 132kV. Then the 132kV bus bar is connected with three 132kV/33kV

transformers. The 33kV outputs from these transformers then goes to the 33kV GIS and

distributed into eight feeders.

Veyangoda

Wathupitiwala

Divulapitiya x 2

Veyangoda / Minuwangoda

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Nittambuwa / Veyangoda

Nittambuwa

Nittambuwa / Pasyala

When we were at the Veyangoda grid substation we got a chance to visit Aniyakanda Grid

Substation to observe an installation of Online Oil filter to a transformer. This is done to

reduce the ppm level of transformer oil when the transformer is running. In grid substation

following components are used. Also we were able to capacitor bank arrangement of

Aniyakanda substation.

Switching equipment.

Transformers

o Power TF

o Auxiliary/ Earth TF

o Instrument TF

CT

CVT

VT

Control & Protection equipment.

Earthing System.

DC power supply.

AC power supply.

Communication system.

Busbar arrangement.

2.2.3.1 Bus bar arrangement

There are three main types of bus bar arrangement single busbar, double busbar and

one and half busbar. There are two main parts in single bus bar arrangement as single busbar

and single busbar with sectionalizer.

Figure 2. 23 –

Single Busbar

Figure 2. 22 -

Single Busbar with bus

Sectionalizer

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2.2.3.2 Power Transformer

In Veyangoda substation there are two power transformers of rating 150MVA

. This transformer is a 220kV/132kV/11kV transformer and the 11kV winding is not

using.the c=vector group of this transformer is YNyn0+d11. The cooling method

used is ONAN(Oil Natural Air Natural) and ONAF(Oil Natural Air Forced).

Diagram of a typical transformer is given in following figure 2.26

BLADDER

CONSERVATOR TANK

DEHYDRATING BREATHER

OIL LEVEL GAUGE

CONNECTING

VALVE

BUCHHOLZ RELAY

DIAL THERMOMETER

TANK OIL PUMP

RADIATOR

COOLER

BUSHING

CURRENT TRANSFORMER

PRESSURE RELIEF DEVICE

Figure 2. 24 – Busbar Figure 2. 25 - One and half bus bar

Figure 2. 26 – Power Transformer Diagram

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If the arc formed inside the transformer buchholz relay operates. It senses the oil level inside

conservator and oil flow through the relay. If the pressure increases inside the tank then the

pressure relief valve is operated and reduce the pressure inside the transformer. In

conservator tank there is a device called bladder this bladder absorbs the air particles from the

oil then this absorbed air is sucked by the dehydrating breather. The colour of silica gel inside

the breather should be blue if the colour changes into pink or red the silica gel should be

changed. Cooling methods of power transformer is mentioned below.

ONAN(Oil Natural Air Natural)

ONAF(Oil Natural Air Fore)

OFAN(Oil Force Air Natural)

OFAF(Oil Force Air Fore)

ODWF(Oil Drain Water Force).

Water cooling

2.2.4 Transmission Operation and Maintenance

2.2.4.1 Protection

Protection can be sub divided into Generator protection, Transformer protection, bus

bar protection and line protection.

2.2.4.1.1 Generator Protection

Differential Protection

Voltage Restrained Over Current Protection

Negative Phase Sequence

Loss of Excitation

Reverse Power Protection

Stator Earth Fault Protection

Rotor Earth Fault Protection

Over Voltage Protection

Under Voltage Protection

Over Active Protection

Over Reactive Protection (Lead/ Lag)

Creep Detect

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Shaft Current Protection

Shaft Voltage Protection

2.2.4.1.2 Transformer Protection

Differential Protection

Restricted Earth Fault Protection

Over Current Protection

Directional Over Current Protection

Buchholz Relay

Transformer Oil and Winding Temperature Alarm and Trip

2.2.4.1.3 Line Protection

Distance Protection

Back-up Protection

Differential Protection

Over Current Protection

Directional Over Current Protection

Sensitive Earth Fault Protection

Directional Earth Fault Protection

Auto Re-closer

2.2.4.2 Hot line maintenance

The hot line maintenance is doing maintenance without removing the supply.

This is very effective method in maintenance but dangerous. Under hot line maintenance

following three functions are carried out.

Hot Line Maintenance of 132kV and 220kV power transmission lines

1. Hot stick method (Lines men at Ground potential)

2. Bare Hand Method (Linesmen at line potential using a conductive

kit)

3. Combined Method

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Cold Line Maintenance of 132kV and 220kV Power transmission lines

1. When it is difficult to use Hot line methods

2. Line and tower shifting work

3. Tower painting

Breakdown attendance of 132kV and 220kV Power transmission lines

1. Line breakdowns

2. Transmission tower breakdowns

2.2.4.2.1 Tower types, design and tower locations

Basically there are 5 types of towers used in transmission.

i. Angle tower

ii. Suspension tower

iii. Tension tower

iv. Terminal tower

v. Transposition tower

These towers again classified from the circuits carried by them.

4

2

3

1

Y

X O

Y

7

3

2

1

8

6

5

4

Y

X O

Y

Figure 2. 28 - Single

circuit Single earth

Figure 2. 27 -

Double circuit Double

earth

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`

2.2.5 Generation and transmission planning

In generation and transmission planning them forecasting the future energy needs of

the country. After analysing providing solution for them. They simulates the designed power

systems using soft wares find solutions for upcoming problems.

2.2.5.1 Generation Planning

Mainly the power generation is done in Sri Lanka using hydro and thermal power

plants. To fulfil future power demands we need to plan the future generation. To do that

demand forecasting should be done.

Growth of the electricity demand is related to the GDP (Gross Domestic Product)

growth. To demand forecasting they are using pas generation and past GDP values.

2.2.5.2 Transmission Planning

Demand is calculated by sales of electricity. Forecasting is done by using past values.

After that the forecasted demand is divided in grid wise. When transmission planning they

are considering about the existing network capabilities of carrying the loads at different

conditions. They also consider about future generation developments.

In transmission planning they are testing the system with PSS/E Simulation software

for different scenarios.

Dynamic condition

Static Condition

7

3

2

1

6

5

4

Y

X O

Y X O

Y

3

5 4

1 2

Figure 2. 30 - Single circuit

Double earth

Figure 2. 29 - Double

circuit single earth

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Contingency Condition ( Single)

In this software they calculate load increments for all grid substations. Update

calculated values in simulation software with loads. First they analyse the steady state and

then single contingency. Finally they analyse the dynamic situation with an automatic script

file. This dynamic system is equal to the actual system. The transmission planning procedure

is attached in ANNEX 05

2.2.6 System Control Centre (SCC)

The generated electricity in Sri Lanka cannot be stored. So the demand of the country

should be produced instantly to balance the power generation and the Demand. The main

responsibility of the SCC is balancing the demand with the generation. They are monitoring

system frequency as a measure of the balance of the demand and the generation.

2.2.6.1 Functions of the SCC

Controlling the system frequency

Controlling the system voltage

Release lines and machines for maintenance

2.2.6.2 Frequency controlling plants in Sri Lanka

New Laxapana

Victoria

Samanalawewa

Kotmale

Upper Kotmale

KPS( Kelanitissa Power Station) small Gas turbines

2.2.6.3 Spinning Reserve

Spinning Reserve margin to be not less than 5% of gross generation.

Additional available high cost generation and available hydro plants with short time

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starting capability may not be started ( for short durations) only to keep this spinning

reserve margin.

2.2.6.4 Pond Balancing

This is a scheme that is used by SCC to release water from each reservoir and

pond to keep level balance while taking the optimum power output according to the

situation of cascaded hydro system.

2.2.6.5 Hydro complexes in Sri Lanka

In Sri Lanka there are major 3 hydro complexes. Mahaweli Complex

,Laxapana complex and Samanalawewa( Other Hydro)Complex.

UPPER KOTHAML

P.S 2×75 MW

Figure 2. 31 - Mahaweli Hydro Complex

Figure 2. 32 - Laxapana Hydro Complex

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2.3 Lanka Electricity Company (PVT) Ltd (LECO)

LECO is responsible for distribution of electricity in distribution region 5. It includes

areas of coastal area in western and southern province. LECO has 7 branches to manage their

distribution.

2.3.1 LECO Kandana Customer Service Centre (CSC)

Brakdown handling, new connections, meter shifting, likewise all the customer end

services are provided by CSC. This is also called as Depot.

2.3.1.1 Installing of a Net Meter

When we were at Kandana CSC we were able to observe the process of installing a single

phase net meter.

2.3.1.2 Components used in Distribution Systems by LECO

Figure 2. 34 –

Single phase net meter

Figure 2. 33 - Net Metering Connection Diagram

Figure 2. 36 - Piercing Connector Figure 2. 35 - Large Angle

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These are some of the components used by

LECO in Distibution Systems.

Figure 2. 37 -

Suspension Clamp

Figure 2. 38 - DDLO-

(Drop down Lift Off)

Figure 2. 39 - FDS ( Feeder Disconnect Switch)

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2.3.2 LECO Head Office

2.3.2.1 Distribution Control Centre

DCC controls the whole process of the interruptions and breakdowns. In here 24 hour

operation is carried out. The high voltage line diagram is drawn on the mimic board. This

mimic board is updated always as the system status. . In addition to that distribution control

centre is the place which issue work permits for high voltage line interruptions. Further it

prepares three main reports such as daily report, electricity supply outage report and

consumer service call report.

2.3.2.2 Geographical Information System (GIS)

Creating a geographical map of the distribution system is the objective of GIS. GIS

has all the information about Distribution Transformers, poles, LBSs, LBCs, ARs,

sectionalizers and all the conductor information.

GPS data is collected by the Branches and depots. They are using data logger and

GPS receiver for this data collection. Technicians at CSC goes to each pole and each

transformer and recording these data. After recording using AutoCAD and pathfinder

software they creating a maps depot wise, Branch wise and overall map.

Figure 2. 40 - A Section of the

mimic board

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2.3.3 LECO Training centre

In LECO training Centre there are arrangements of switches, transformers quite similar to the

real operation. We were able to see inside of a distribution transformer, DDLO, LBS,

arrangements

2.3.3.1 Meter test lab

In LECO energy meters at consumers’ houses are replaced in every five years, these

removed meters are tested in test lab. Also new 3phase and net meters are tested in here. In

this test lab following tests are carried out.

• Full Load Test

• Low Load Test

• Maximum Load Test

• Power Factor Test

Figure 2. 42 - Inside of

Distribution Transformer

Figure 2. 41 - – LBS arrangement

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2.3.3.2 Transformer Workshop

In transformer workshop repairs of the transformers is being doing. After the

repairing of a transformer they performing few tests for transformers. Insulation megger test,

oil test, ratio test, load test. If the transformer failed any of above test again error is checked

and repaired. The oil test is carried out using oil tester.

Figure 2. 43 - Testing bench used to testing meters

Figure 2. 44 – Oil Tester

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2.3.4 ANTE LECO Meter factory

In ANTE LECO factory they are testing the new meters imported from china.

They are using test benches to test the new meters and the testing process is automatic if there

is any error in a meter the system indicates the fault and that meter is tested again after

repairing.

Figure 2. 46 - Inside of electronic

meter Figure 2. 45 - Electro

Mechanical meter

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3. CONCLUSION

Training Division of UOM along with NAITA has done tremendous service in

organizing industrial training for undergraduates. Maintaining daily diary was helpful to

revise knowledge gained at training Establishment. I choose the DIMO(PVT) Ltd for the first

12 weeks of training period. It was the first time I was conduct myself in an office

environment. It was very clean and smart office environment. I was trained under Design and

Estimation Manager Mr. Jagath Wickramasekara. It produces ELV solutions like CCTV,

BMS. I did not have good knowledge about ELV systems. So Ms. Sayuri Sumithraarachchi

and Mr. Ruwan Dissanayake helped me and my friend to acquire a good knowledge about

ELV systems. I think it is better to give knowledge ELV systems before training. It will be

benefit trainees when conducting training in such a place. Because we had to spend a lot of

time on learning those theories. Only few opportunities I got to involve in practical work. We

missed a chance to involve in a new project as the relevant equipment was not reached to the

company and we were finishing the training period in that company. In last few weeks I was

able to visit the site at Movenpick hotel construction. In there I studied lot of practical issues

we had to face when implementing a real system.

I hope practical knowledge will benefit me in the future and I would like to say that I

obtained good practical and theoretical knowledge from this company. I must mention that I

was easy to carry out my training with interesting because the people of the company were

very friendly and willing to help.

I spent 8 weeks in Ceylon Electricity Board as a trainee. I had a chance to get training from

several sections of CEB. I was able to get training from Kotmale Hydro Power station, ,

Kelanitissa Combined Cycle Power Station,Sapugaskanda Diesel Power station, System

Control Centre, Generation Planning Branch and Veyangoda Grid Substation. I understood

how theories are employed in the field after I got in-plant training from CEB. It was very

interesting training experience in Kotmale hydro power station.because when we were there a

big maintenance of unit 01 is being carrying out. So we were able to identify the components

inside of the generator. I think it was a once in lifetime chance to going inside to the spiral

cage of a Hydro generator. Got clear idea about how to generate a unit of electrical energy we

used at our premises. I identified electromechanical components which involve in generation

process. I also learned about thermal power generation from KCCPS and Sapugaskanda

PS.Whwn we were at Sapugaskanda PS we were expeiriencea an islanwide blackout and

observed the actions carried out in the plant to recover the plant. I got good knowledge about

the gas turbine generation and combined cycle generation and identified the major

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components. I learned how to balance demand and supply and how to keep system quality

from System Control Centre. I studied long term generation planning from Generation

Planning Branch of CEB. I got rare chance to observe transformer online oil filtering when I

was training in Veyangoda grid substation in addition to studying about the transmission

system. However I got valuable industrial training from CEB sections. People were friendly

and most of them helped us to conduct our training successfully.

Other 4 weeks I got training experience from LECO. I was assigned to Kandana Customer

Service Centre, Kelaniya Branch Office, Engineering division, Distribution Control Centre

and Meter Testing Laboratory. At depot I observed how they interact with the customer and

the services they supplied.. I also had a visit to primary substation nearby. During the week I

spent in Engineering division I got general knowledge about distribution planning. I learnt

about energy meter testing from the Meter Testing Lab in Ekala. I could get sound overall

idea about the LECO distribution network.

I must mention something about the overall training program. It is better there was training

schedule to follow. Therefore it was easy gain knowledge. If we were assigned to a one

training place for all 24 weeks, it may useless if we could not involve in practically to the job.

So I clearly declare that the training programme conducted for our batch benefited every

student who underwent it. And I hope I got valuable training experiences for my future

career.

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ANNEX 01

Organization Structure – DIMO (PVT) Ltd.

OR

GA

NIZ

ATI

ON

CH

AR

T D

IMO

C

HA

IRM

AN

CEO

Man

agin

g D

irec

tor

(Mr.

Sar

ath

Alg

ama)

Ch

ief

Op

erat

ing

Off

icer

(Mr.

Wiji

th P

ush

paw

ela

) D

irec

tor

(Mr.

Ro

shan

Fer

nan

do

)

Bu

sin

ess

Un

it

Man

ager

(Sh

ip R

ep

airs

)

Man

ager

Acc

ou

nts

&

Ad

min

istr

atio

n

Bu

sin

ess

Un

it

Man

ager

(IT

Pro

ject

s)

Bu

sin

ess

Un

it M

anag

er

(Bu

ildin

g Te

chn

olo

gies

)

Bu

sin

ess

Un

it M

anag

er

(Po

we

r So

luti

on

s)

Bu

sin

ess

Un

it M

anag

er

(Hea

lth

Car

e)

Man

ager

Serv

ices

Pro

du

ct

Man

ager

s M

anag

er

Sale

s

Man

ager

Pro

ject

s M

anag

er

Sale

s

Man

ager

Pro

ject

s

Exe

cuti

ve

Man

ager

Sh

ip

Rep

airs

Site

Engi

nee

rs

Co

mm

erci

al

Exe

cuti

ve

Co

mm

issi

on

ing

Engi

nee

r

Site

Engi

nee

rs

Co

mm

erci

al

Exe

cuti

ve

Co

mm

issi

on

ing

Engi

nee

r

Tech

nic

ian

s Te

chn

icia

ns

Mec

han

ical

,

Elec

tro

nic

Engi

nee

rs

Tech

nic

ian

s

Sale

s

Engi

nee

r

Sale

s

Exe

cuti

ve

Co

mm

erci

al

Exe

cuti

ve

Exe

cuti

ves

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50

ANNEX 02

Organization Structure -CEB

Chairman and the members of the board

General Manager

AGM Corporate Stratergy

AGM Generation

AGM Transmission

AGM Distribution

Division 1

AGM Distribution

Division 2

AGM Distribution

Division 3

AGM Distribution

Division 4

AGM Asset Management &

Centralized Services

AGM Projects

Finance Manager

Chief Internal Auditor

Chief Legal Officer

Secretery to the Board

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ANNEX 03

Organization Structure - LECO

Share holders

Chairman & Board of Directors

General Manager

Head of Engineering

System Development

Manager

Chief Financial Officer

Head of Operations

Branch ManagerSystem

Operations Manager

Human Resource Administration

Internal Auditor

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ANNEX 04

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53

ANNEX 05

National power and Energy demand forecast

Grid demand forecast

Capacity enhancement proposals

System studies

Transmission expansion proposals

Saticfactory

Long term transmission development plan

Distribution

development plans

Generation

expansion plans

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ABBREVIATIONS

1. DIMO - Diesel and Motor Engineering

2. CEB – Ceylon Electricity Board

3. LECO – Lanka Electricity Company

4. ELV – Extra Low Voltage

5. BT – Building Technologies

6. CCTV – Closed Circuit Television

7. BMS – Building Management System

8. ABC – All Bundle Conductors

9. IP – Internet Protocol

10. IP – Ingress Protection

11. LAN – Local Area Network

12. PTZ – Pan/Tilt/Zoom

13. VRMS – Video Record Management Server

14. VAS - Video Analytic Server

15. PoE – Power over Ethernet

16. RFID – Radio Frequency Identification

17. NTP – Network Time Protocol

18. HVAC – Heat Ventilation Air Conditioning

19. FCU – Fan Coil Unit

20. AHU – Air Handling Unit

21. DDC – Direct Digital Controller

22. PS – Power Station

23. MIV – Main Inlet Valve

24. AVR – Automatic Voltage Regulator

25. Rpm – Revolutions per minute

26. CVT – Capacitor Voltage Transformer

27. VT – Voltage Transformer

28. PT – Power Transformer

29. CT – Current Transformer

30. CB – Circuit Breaker

31. GT – Gas Turbine

32. ST –Steam Turbine

33. HP –High Pressure

34. LP – Low Pressure

35. HRSG – Heat Recovery Steam Generator

36. PMG – Permanent Magnet Generator

37. HFO – Heavy Fuel Oil

38. SUT – Step Up Transformer

39. TF - Transformer

40. GDP – Gross Domestic Product

41. SCC – System Control Centre

42. CSC – Customer Service Centre

43. GIS – Gas Insulated Substation

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44. GIS – Geographical Information System

45. FDS – Feeder Disconnect Switch

46. DDLO – Drop Down Lift Off

47. LBS – Load Break Switch

48. LBC – Load Break Cut-out