Damodar Valley Corporation DVC Training Report

7/23/2019 Damodar Valley Corporation DVC Training Report

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Department of Electrical Engineering

P R O J E C

T R E P O R T O N D

A M O D A R

V A L L E Y C O R P O R A T I O N ( D V C )

DVC is the first-ever multipurpose river valley project of independent

India which came into being on July 7, 1948 by an act of Constituent Assembly (Act no. XIV of 1948). DVC was set up with the intent of promoting and operating the schemes which may cause social andeconomic uplift in the valley region. The difficult but effective water management by the corporation has turned the devastating river Damodar from a “River of Sorrow” to a “River of opportunities”.

B y

R A J E S

H G

A R A I



I wish to express my gratitude to all those individuals with whom, I interacted and gainedknowledge, insight and thoughts while preparing this project report.

First of all, I am grateful to the Sr. Chief Engineer (Sys. & Gen.) & HOP, DVC, Maithon for

granting me permission to do this project in the organization. At the same time I would like to

thank The Sr. P.R.O., The C.E. (CLD), THE C.E. (Trans.), THE C.E.(CM),CSO, and THE C.E (Hydel) for

their co-operation during the training period. I would also extend my thanks to

Shri B. Aggarwal, Kumardhubi sub-station

Shri Sanjay Bhattacharya,Incharge Kumardhubi sub-station

Shri S.K. Saha, Electrical Workshop(Transformer)

Shri M.S. Das, Electrical Workshop(Motor)

for their able guidance and encouragement while working on this project.

I also take this opportunity to thank the Superintending Engineers of all the divisions of DVC for

their co-operation while I visited their respective divisions. I also owe a lot to my father Shri S.

C. Garai, Practicing Cost Accountant, who has always been a source of guidance and inspiration

while making this project and without the help of whom, doing this project was almost

impossible.

Last but not the least; I would like to thank my internal project guide Shri Bibhas Bit, P.A.,

D.M.(Vigilance), DVC Maithon for his help as and when required.



Public Relation Office

o Introduction

o Mission & Vision

o Physical Performanceo Generation Project

o Anticipated Growth

o Infrastructure

o Water Management Overview

o Mining

o Dams & Barrage

o Reservoir Operation

o Welfare

o Rural Electrification

Central Load Dispatch

o Introduction

o Real Time DVC Ex-Bus Generation (MW)

o Meter Locations in DVC Interconnected System

o UI rate & Frequency

o SCADA

Transmission

o Kumardhubi Substation

o Ratings

o Common Terms

o Transmission System

o Gridmap

o Substation

o Electrical substation model (side-view)

o Powermap

CSO

o Introduction

o Transformer

o Motor

Hydro

o Introduction

o Operation

o Francis Turbine



Address: PRO office, Combined Administrative Building (2nd Floor), Area-6,

Damodar Valley Corporation,

P.O Maithon Dam, Dist. Dhanbad, Jharkhand

PIN-828207



1

DVC, a legacy to the people of India, emerged as a culmination of attempts made over a

whole century to control the wild and erratic Damodar river. The river spans over an area of 25,000 sq. kms

covering the states of Bihar (now Jharkhand) & West Bengal.

The Damodar Valley has been ravaged frequently by floods of varying intensities and the first of the major

recorded flood dates back to 1730. Thereafter serious floods occurred at regular intervals, but it was the floodof 1943 that left the worst devastation in its wake. As a result, the Governor of Bengal appointed a Board of

Inquiry headed by the Maharaja of Burdwan and the noted physicist Dr. Meghnad Saha as member. In their

report, the Board suggested creation of an authority similar to the Tennessee Valley Authority (TVA) of United

States of America. The Government of India then appointed Mr. W.L. Voorduin, a senior engineer of the TVA

to make recommendations for comprehensive development of the valley. Accordingly, in August, 1944, Mr.

Voorduin submitted his "Preliminary Memorandum on the Unified Development of the Damodar River".

Mr. Voorduin’s "Preliminary Memorandum" suggested a multipurpose development plan designed for

achieving flood control, irrigation, power generation and navigation in the Damodar Valley. Four consultants

appointed by the Government of India examined it. They also approved the main technical features of

Voorduin’s scheme and recommended early initiation of construction beginning with Tilaiya to be followed by

Maithon.

By April 1947, full agreement was practically reached between the three Governments of Central, Bengal and

Bihar on the implementation of the scheme and in March 1948, the Damodar Valley Corporation Act (Act No.

XIV of 1948)was passed by the Central Legislature, requiring the three governments – the Central Government

and the State Governments of West Bengal and Bihar (now Jharkhand) to participate jointly for the purpose of

building the Damodar Valley Corporation.

The Corporation came into existence on 7th July, 1948 as the first multipurpose river valley project of

independent India



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To realize DVC’s Mission, the following corporate objectives have been identified for persuasion:

Generate maximum on sustainable basis through implementation of best O&M practices.

Rejuvenate old generating units through refurbishment / replacement / comprehensive overhauling

programme.

Capacity augmentation through extension and green field projects.

Strengthening of the existing transmission and distribution network and augmentation to match withthe capacity addition.

Transmit, distribute and supply reliable and quality power at competitive tariff.

Improve the financial health of the Corporation by adoption of efficient industrial, commercial and

human resource management practices.

Ensure optimum utilization of available water resources through effective and efficient management

and harnessing the remaining potential of Damodar basin.

Adopt measures for pollution abatement of Damodar River.

Ensure environmental protection at plant level.

Strengthen activities of eco-conservation in the valley area & to make Damodar valley more Green.

Unified socio-economic development for the inhabitants of villages neighboring major projects of DVC.

To pursue with development of tourism at Maithon, Panchet, Tilaiya and Hazaribagh.

Revival of Fish Farming in DVC reservoirs.

Skill development training to local youth around DVC Projects to improve their employability &

upgrading infrastructural facilities at existing Industrial Training Institute (ITI) at Purulia, Durgapur &

Chhatna in West Bengal & Chas and Hazaribagh in Jharkhand and also setting up of the Jharkhand

Govt. proposed new ITI at Kodarma as well as new ITI at existing Chandrapura Training Institute of

DVC.



3

Generation of Electricity

Actual Generation(MU)

Plants 2009-10 2010-11

Thermal 14521.52 16263.9

Hydel 198.11 115.6

Overall 14719.63 16379.5

Other operating parameters of thermal generating units:

Thermal

Parameter 2009-2010 2010-2011

Plant Load Factor (%) 61.17 68.51

Specific Oil Consumption (ml/kwh) 2.66 1.74

Auxiliary Power Consumption (%) 10.68 10.72



4

Sl.

No.

Project Unit Capacity

(MW)

Status

Project implementation by DVC own

1 MTPS Extension Unit#5 250 MW COD declared on

29.02.2008

2 MTPS Extension Unit#6 250 MW COD declared on

24.09.2008

3 CTPS Extension Unit#7 250 MW COD declared on

02.11.2011

4 CTPS Extension Unit#8 250 MW COD declared on

15.07.20115 Mejia TPS Unit#7 500 MW COD declared on

02.08.2011

6 Mejia TPS Unit#8 500 MW Full load achieved

on 26.03.2011

7 Koderma TPS Unit#1 500 MW Full load achieved

on 20.07.2011

8 Koderma TPS Unit#2 500 MW Under Construction

9 Durgapur Steel TPS Unit#1 500 MW COD declared on15.05.2012

10 Durgapur Steel TPS Unit#2 500 MW Full load achieved

on 23.03.2012

11 Raghunathpur Ph-I TPS Unit#1 600 MW Under Construction

12 Raghunathpur Ph-I TPS Unit#2 600 MW Under Construction

13 Bokaro-A TPS Unit#1 500 MW Under Construction

Project implementation through Joint Venture

1 Maithon RB TPS [by MPL,JV of DVC & TPC]

Unit#1 525 MW COD declared onSept'2011

Unit#2 525 MW Full load achieved

on May'2012

Up to May'2012



5

Plan Period Year Energy Requirement

(MU)

Peak Demand

(MW)

10th Plan 2002-2003 9307.52 1758

2003-2004 9635.00 1819

2004-2005 10018.08 1892

2005-2006 13588.80 1986

2006-2007 14155.00 2145

11th Plan 2007-2008 15146.00 2340

2008-2009 15903.00 2574

2009-2010 17334.00 2857

2010-2011 18200.00 3085

2011-2012 19135.00 3333



6

DVC INFRASTRUCTURE AT A GLANCE DVC Command Area 24,235 Sq. Kms

POWER MANAGEMENT

Total Installed Capacity 2796.5 MW

Thermal Power Stations Five Capacity 2570 MW

Hydel Power Stations Three Capacity 144 MW

Gas Turbine Station One Capacity 82.5 MW

Sub-stations and Receiving Stations

At 220 KV – 11 nos.

At 132 KV – 33 nos.

At 33 KV – 16 nos.

Transmission Lines

220 KV – 1500 ckt kms

132 KV – 3415 ckt kms

33 KV – 1070 ckt kms

Water Management

Major Dams and Barrage Tilaiya, Konar, Maithon Panchet dams and DurgapurBarrage

Irrigation Command Area (gross) 5.69 lakh hectares

Irrigation Potential Created 3.64 lakh hectares

Flood Reserve Capacity 1292 million Cu.m.

Canals 2494 kms

Soil Conservation

Forests, Farms, Upland and Wasteland Treatment 4 lakh hectares (approx)

Check Dams 16,000 (approx)



7

Water Management Overview

DVC has a network of four dams - Tilaiya and Maithon on river Barakar, Panchet on river Damodar and Konar

on river Konar. Besides, Durgapur barrage and the canal network, handed over to Government of West Bengal

in 1964, remained a part of the total system of water management. DVC dams are capable of moderating

floods of 6.51 lac cusec to 2.5 lac cusecs.

Four multipurpose dams were constructed during the period 1948 to 1959.

a) Maithon Dam

b) Panchet dam

c) Tilaiya Damd) Konar Dam

Flood reserve capacity of 1292 mcm has been provided in 4 reservoirs, which can moderate a peak

flood of 18395 cumec to a safe carrying capacity of 7076 cumec.

419 mcm of water is stored in the 4 DVC reservoirs to supply 680 cusec of water to meet industrial,

municipal and domestic requirements in West Bengal & Jharkhand.

A barrage on river Damodar was constructed in 1955 at Durgapur for supply of irrigation water to the

districts of Burdwan, Bankura & Hoogly.

Irrigation Command Area (Gross) - 5.69 lakh hectares.

Irrigation Potential Created - 3.64 lakh hectares.

Canals - 2494 kms.

30,000 ha of land in the upper valley is being irrigated, every year by lift irrigation with the water

available from 16,000 (approx) check dams constructed by DVC.



8

Mining Activities

DVC started its mining activities in 1951 by acquiring captive coalmine at Bermo from the Indian Railway to

meet the coal requirement of Bokaro ‘A’ Thermal Power Station.

During 2006 – 07, Bermo Mines made a production of 3.85 lakhs MT of coal surpassing the target of 3.6 lakhs

MT and made a profit of Rs. 5.1 crore

Physical Performance of Bermo Mines

Year OB removal

(Cu.mtr)

Achievement

(%)

Coal production

(MT) Achievement (%)

2005 – 06 339173 28.26 368007 102.00

2006 – 07 1310714.30 137 384911.44 106.92

For supplying coal to new power plants coming under capacity addition programme during 10th and 11th Five

Year Plants, DVC has acquired three coal blocks namely, Barjora (North), Khagra Joydev and Kasta (East) from

Eastern Coalfields Ltd. Besides these, the Gondulpara coal block has been allotted both to DVC and Tenughat

Vidyut Nigam Ltd. Of Jharkhand for mining and sharing the production equally. For this coal block, Tenughat

Vidyut Nigam Ltd, is the lead company. To raise coal from the other newly acquired coal block, a joint venture

company named DVC EMTA Coalmines Ltd, has been formed by DVC with the Eastern Minerals & Trading

Agency (EMTA).



9

Tilaiya Konar Maithon Panchet Inauguration 21.02.53 15.10.55 27.09.57 06.12.59

On River Barakar Konar Barakar Damodar

District Hazaribagh Hazaribagh Dhanbad Dhanbad

State Jharkhand Jharkhand Jharkhand/

W. Bengal

Jharkhand/

W.Bengal

Height above river bed (meters) 30.18 48.77 50.00* 40.84*

44.00** 45.00**

Length (meters) 366 4535 4860 6777

Width of roadway (meters) 3.81 5.79 6.78 10.67

Power generating capacity 2 x 2 MW - 3 x 20 MW 2 x 40 MW

Storage capacity (million cu.m.)

To dead storage 75.25 60.4 207.24 170.37

To top of gates 394.74 336.76 1361.84 1497.54

Allocation of storage capacities (MCM)

For irrigation & power 141.86 220.81 611.84 228.21For flood control 177.63 55.51 542.76 1086.76

Drainage area (sq. km.) 984.2 997.1 6293.17 10966.1

Reservoir (sq. km.)

At dead storage level 15.38 7.49 24.28 27.92

At maximum conservation pool 38.45 23.15 71.35 121.81

Area top of gates 74.46 27.92 107.16 153.38

*Earthen Dam **Concrete Dam

Durgapur Barrage Year of construction 1955

Length 692 m

Number of gates 34 (including under sluice)

Size of gates 18.3m x 4.9m [60 ft x 16 ft]

Left & right under sluice 18.3m x 5.5 m [60 ft x 18 ft]

Operating levels Between RL. 64.5 m [211.5 ft] to RL. 63.4 m [208.0 ft]



10

Monsoon Operation (June - October)

A vast hydrometeorological station network with VHF / wireless facilities exists over the Damodar

catchment area.

On real time basis {hourly, 3 hourly, 6 hourly} data of river gauge, rainfall, river discharge are measured

and transmitted through existing communication network to central flood control station at Maithon.

Indian Meteorological Department (IMD), Kolkata transmit the rainfall forecast for next 24 hrs for the

entire Damodar valley region to Maithon.

Computer model available at Flood Forecasting Unit (FFU) at Maithon estimates the inflow into the

reservoirs based on the real time data & the rainfall forecast of IMD.

According to detailed guidelines contained in the "Damodar Valley Reservoir Regulation Manual"

Member Secretary DVRRC (Damodar Valley Reservoir Regulation Committee) after discussion with SE,Damodar Irrigation Circle Govt. of W B, Manager, Reservoir Operation of DVC and SE, Tenughat of

Govt. of Jharkhand decides day to day release of water from Maithon and Panchet Dams and issues

advice for release of water through the dams.

Flood Warning

Before releasing water from dams spillway gates, necessary warning is communicated to district

authorities, affected downstream industries, municipalities and others including senior administrative

officials of Burdwan, Bankura and Purulia. , I0 W Dept., Govt. of W.B., EE, DHW, Durgapur, Member

(RM), CWC, New Delhi. Whenever discharge from Maithon & Panchet dams exceeds 1132 cumec (40,000 cusec), special

messages are broadcasted through Doordarshan and AIR regional news bulletins.

Doordarshan, Kolkata also telecasts daily weather forecast with probable rainfall in the Damodar

Valley.

Water for Irrigation

Water from DVC dams is regulated by the Durgapur barrage through the existing network of 2494 kms of canals. This ha

created irrigation potential for 3.64 lakh hectares of land annually.

3.42,000 hectares of Kharif Crop, 22,000 hectares of rabi crop and 30,000 hectares of boro crop are irrigated annually in

the districts of Barddhaman, Hooghly, Bankura and Howrah in the state of West Bengal.

About 30,000 hectares of land in the upper valley is irrigated annually by lift-irrigation with water available from over

16,000 check dams constructed by DVC.

Industrial and Civic water provisions

About 625 cusec of water is released every year to meet the demand of approximately 150 industries, civic

bodies and railways in Jharkhand and West Bengal.



11

Social Integration Programme(SIP)

DVC launched its Social Integration Programme (SIP) in 1981.SIP is basically an expression of DVC’s deep

commitment to socio-economic and infrastructural development of the communities residing within a 10 Km

radius of its main projects.

The programme started with 25 villages. At present it operates in 375 villages covering 70 Panchayats in 12

blocks of Dhanbad, Giridih, Bokaro and Hazaribagh districts of Jharkhand and Barddhaman, Purulia and

Bankura districts of West Bengal.

Areas covered under the programme:

Education

Agriculture

Health

Infrastructural Development

Sports and Culture

Rural Electrification

Self- employment

Social Forestry



12

With a view to provide access to electricity to all rural households, Government of India has launched a new

scheme under “RAJIV GANDHI GRAMEEN VIDYUTIKARAN YOJANA”. The task of implementing the scheme and

to augment resource capacities for implementation, Union Ministry of Power has involved CPSUs like NTPC,

NHPC, PGCIL & DVC for making available their expertise and capabilities to the states willing to use the same.

DVC has been assigned the project of rural electrification in Purba Medinipore district of West Bengal and

eight districts in Jharkhand, namely, Dhanbad, Bokaro, Koderma, Giridih, Hazaribagh, Gumla, Simdega and

Chatra as deposit work on behalf of respective SEBs. Quadripartite agreement have been signed by REC, DVC,

respective State Governments and SEBs. All funds in the form of subsidy and loan assistance provided by the

Government for the programme would be channelised through REC. Beside this, REC will act as nodal agency

for complete supervision of the programme from concept to completion. The role of DVC is in project

formulation, planning, design and engineering, procurement of goods and implementation/commissioning of the project.

PROJECT AT A GLANCE IN WEST BENGAL

DVC has been executing Rural Electrification Project under AREP (Accelerated Rural Electrification Programme)

Scheme in the District of East Midnapur of West Bengal covering 807 nos. un-electrified mouzas as per the

project sanctioned by REC. The work is expected to be completed by March, 2008.

The scheme has subsequently been merged with the newly formulated RGGVY Scheme and as such, DVC has

to undertake intensification work in the said districts for providing 100% access to electricity to all mouzas

having population of 100 nos. or more as per MOP/REC guidelines. Accordingly, DPR for such intensification

comprising of a total of 2854 partly electrified mouzas have been submitted to REC for which sanction is

awaited.

PROJECT AT A GLANCE IN JHARKHAND

Similar assignment has been entrusted to DVC for rural electrification project in the State of Jharkhand by the

Jharkhand State Electricity Board (JSEB) on behalf of Government of Jharkhand with the concurrence of

REC. Quadripartite agreement with REC, DVC, Government of Jharkhand and JSEB has already been

signed. The project in Jharkhand will cover 8547 villages in 8 districts namely, Dhanbad, Bokaro, Koderma,

Giridih, Hazaribagh, Gumla, Simdega and Chatra spread over 76 no. blocks under RGGVY Scheme.

Rural Electrification works in Dhanbad, Koderma, Bokaro, Gumla and Simdega districts are in progress as per

the projects sanctioned by REC whereas the contracts for the rest three districts namely, Chatra, Hazaribagh

and Giridih are ready for award and awaiting sanction from REC.



Address-

CLD office, Combined Administrative Building (2nd Floor), Area-6, Damodar Valley Corporation,


PIN-828207



1

Introduction A ULDC/load Dispatch Centre of Damodar Valley Corporation is the Modern

Computerized on-line data monitoring system of DVC.

Main Display at Central Load Dispatch

(Date – 18 July, 2012)

(Time – 10:17 am)



2

Real Time DVC Ex-Bus Generation (MW)DATE: July 29, 2012 FREQUENCY: 49.95 UI RATE: 201.50 Last update

Time:20:43

THERMAL HYDELUNITS BTPS-B MTPS DTPS CTPS DST

PS

KTP

S

RTP

S

MHS PHS

UNIT1 0 0 0 295 13 34UNIT2 156 175 74 0 19 35UNIT3 174 0 118 97 13UNIT4 132 142UNIT5 204UNIT6 200UNIT7 0 235UNIT8

527 254TOTAL 330 1238 260 659 295 45 69

BUS VOLTAGE TIE FLOW (MW) GENERATION

MW

220 KV SYSTEM 132 KV SYSTEM SCHEDULE ACTUAL THERMAL 2782

230 133 -594 -796 HYDEL 115

TOTAL 2897

394.00 -796 SEMData

SEM Meter Location (-) Outflow, (+) Inflow

Real time power generation counter is available at:-

http://portal.dvc.gov.in/ddd.html

http://www.erldc.org/Commercial-ER/semdata/



http://portal.dvc.gov.in/SEM_Meter_Location.jpg










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Address - Kumardubi Sub station,

Kumardubi, Dhanbad, Jharkhand



1

KUMARDHUBI 132KV (Sub-Station)

The 33kV, 132kV DVC substation at Kumardubi is fed by two 132 kV feeders, one from Maithon and another fromPanchet. The substation is a part of 132kV GOMD II Grid. It comes under the direct control of Damodar Valley

Corporation Ltd. It is one of the oldest substations in India.

The substation feeds

ER (Eastern Railway)

–

Two Phase Line (Red and Yellow)

JSEB (Jharkhand State Electricity Board) - Three Phase Line WBSEB (West Bengal State Electricity Board) - Three phase Line



2

This Sub Station provides supply to INDIAN RAILWAY, JSEB and WBSEB. The yard mainly consists of the static machines.

The main things in the yard are transformers, current transformers, potential transformers, towers, bus bars, isolators,

circuit breakers, lighting arresters, insulators used for the machines. The whole place is covered with granite.

Underground cables are used to connect the equipment in the yard with the control room.

BUS BAR

The no of lines operating at the same Voltage are directly connected to a common Electrical component called Bus –Bar.

Bus Bar is of Copper or Aluminum rectangular in cross section operates at constant Voltage. Conductor is Kundah. The

incoming & outgoing lines in sub-stations are connected to Bus Bar.

BUS-BAR Arrangement:

The bus-bar in this substation is a 1 ½ bus bar arrangement where three breakers are used to control two buses. This is a

highly advantageous system. These results in a drastic reduction in the cost of circuit breakers and isolators required as

compared to the conventional arrangement. It also results in a reduction in the total area required to set up the bus bar

network. All newly set up substations are now using this system of bus bar arrangement.

The other advantages of this arrangement are as follows: -

1) If fault occurs on any section of the bus bar, that section can be isolated without affecting the supply from other

sections

2) Repair & maintenance of any section of the bus-bar can be carried out by de-energizing that section only, thus

eliminating the possibility of complete shutdown.

Feeders –incoming and outgoing

There are a total of two 132 kV incoming feeders to the substation as seen in the single line diagram. They carry power

from Maithon and Panchet. These have been designated as Line- 70 and Madurai-16 respectively.

There are 10 outgoing feeders.

2 for Railway

5 for JSEB

3 for WBSEB



3

Ratings

132KV OCB FOR TRANSFORMER # II (RLY TRANSFORMER-25MVA)

Type: HKEYC 2/120/800

Make: ASEA Commissioned on: 13.05.61

Rated Voltage: 132 kV

Rated Continuous Current: 800A (2 phase)

Rated Short time Current: 14kA for 3 sec

Making Current: 29 kA

Breaking Current: Symmetrical -11.35 kA Asymmetrical-11.35 kA

Rupturing Capacity: 2500 MVA at 132 kV

Auxiliary Supply: 250V DC

Closing device: Spring

Spring charging motor Supply: DC C.T Ratio: 200/5

33kV OCB (TRANSFORMER # I)

Type: OCB- KOR

Make: NISSIN ELECTRICAL CO. Ltd.

Commissioned on: 04.10.1967

Rated Voltage:33kV

Rated Continuous Current: 1200 Amp Rated Short time Current: 3sec – 26.3KA

Rupturing Capacity: 1500 MVA

Breaking Capacity: Symmetrical- 26.3 kA, Asymmetrical- 32.2 kA

Rated making Current: 67.1kA(peak)

Closing Device: Spring

Driving Motor: 440 V,3 phase, 50 Hz, 0.4 KW

Auxiliary Supply: 250v DC, 440 V AC, 3 phase

CB- 03(SF6 CGL)

Type: 70 SFM- 31 A (1 phase)

Date of commissioning: 18.12.2000

Rated voltage: 72.5kV

Rated Continuous Current: 1600 kV

Rated Short time Current: 3 sec- 31.5 kVA

First Pole to Clear Factor: 1.5

Rated Line Charging Braking Current: 10 A

Rated Closing Voltage: 250V DC

Rated Opening Voltage: 250V DC



4

Lightning Impulse Withstant:325 kvp

SF6 gas Pressure: 5 kg/cm2

at 20’ C

Auxiliary Supply: 415 VAC

BUSHING C.T. (NEUTRAL)

Make: C & H ltd (England)

Type: 22BO Ratio: 600-300-150/5*

Frequency: 50Hz

Volts: 50kV

Burden: 25

Class: 510

Sp. No: BS 2046

132kV POTENTIAL TRANSFORMER

Make: GENERAL ELECTRIC COMPANY

Type: EMFA-120

Commissioned on:- 13.06.1961

Quantity: 3 Nos., 1 Phase

Ratio:13200 110 110 110

/ /110 / /

3 3 3 3

Burden: 5000MVA; No. of phases:3

Frequency: 50Hz

Accuracy: B

Class

Sl. No. :

R-4623891

Y-4623890

B-4623889

BSS- 81/1936



5

Common Terms

Instrument Transformers:The lines in the substation operate at high voltage and carry current of thousands of ampere. The measuring

instruments and protective devices are designed for low voltage and current . They will not work satisfactorily if

mounted directly on the power lines. This difficulty is overcome by installing instrument transformers. The function is totransfer voltage or current in the power line to values convenient for the operation of measuring instruments and relays

The two type of instrument transformer in the substation are:

1) Current Transformer

2) Capacitive voltage transformer

Isolators:In order to disconnect a part of the system for general maintenance and repair, isolators are used. It is a knife switch &

designed to open a circuit under no load. If isolators are to be opened, the CB connected must be opened first.

Otherwise there is possibility of occurrence of spark at the isolator contacts. Symbol –/ –. After repair close Isolators and

then CB. Two types line isolators & bus isolators. For bus isolators, there is no earth switch.

Circuit Breakers:A circuit breaker is equipment, which can open or close a circuit under normal as well as fault conditions. It can operate

manually as well as remote control under normal condition and automatically under fault condition. For latter relay

circuits are used. It consists of a moving and fixed contacts enclosed in strong metal tank. Under normal condition

contacts remain closed and the CT senses the breaker carries full load current .The protection operation. When fault

occurs, the over-current in the CT primary winding increases the secondary EMF thus energizing the trip coil and moving

contacts are pulled down, thus opening the contacts and hence the circuit .The arc produced during is quenched by

different medium like SF6 gas, vacuum etc.

DC Battery set:

In order to ensure the smooth operation of the circuit breakers even in the event of a failure in the ac supply to theoperating motor, and to supply dc to the various relay coils, the substation has a dc battery set. It consists of 110 cells of

rating 400AH each with voltage output of 2V (so total=220V). There are two such sets of cells. In addition to this, there

are two other sets of dc cells having voltage=50V meant to supply Power Line Carrier (PLCC) equipment.

DC Generator set:In order to ensure continuous auxiliary supply to the substation auxiliary equipment, a dc generator set is also provided

here. Its capacity is 250kVA.



6

Charged with the responsibilities of providing electricity, the vital input for industrial growth inthe resource-rich Damodar Valley region, DVC over the last 60 years has developed a big androbust transmission network consisting of 132 KV and 220 KV grids. DVC grids operates in

unison with the eastern regional grid through 132 KV and 220 KV tie lines. All the power stationsand substations of DVC are connected with the DVC grids. DVC power consumers are providedsupply at 25 KV, 33 KV, 132 KV and 220 KV pressure.

DVC Transmission Lines in service at a glance

State Transmission line length in CKm

220 KV 132 KV

Jharkhand 798 2238

West Bengal 536 1177TOTAL 1334 3415

Interconnecting Tie Lines with DVC Network

Tie-Line Voltage Other Utility Length(CKm)

D/C DTPS-Bidhannagar 220KV WBSEB 34.52

S/C Jamshedpur-Joda 220KV GRIDCO 135.00

D/C Kalyaneswari-Pithakari 220KV PGCIL 13.5

D/C Parulia-Parulia 220KV PGCIL 2.00

S/C CTPS-STPS* 220KV WBSEB 12.64

S/C Barhi-Biharsharif 132KV JSEB 95.00S/C Barhi-Rajgir 132KV JSEB 80.00

S/C Maithon-Sultanganji 132KV JSEB 107.60

S/C Ramgarh-PTPS 132KV JSEB 30.40

D/C Patratu-PTPS 132KV JSEB 20.00

S/C Chandil-Manique 132KV JSEB 3.00

D/C DTPS-DPL* 132KV DPL 22.00

S/C Kolaghat-Kolaghat 132KV WBSEB 3.00

S/C Kharagpur-Kharagpur 132KV WBSEB 1.00

S/C Purulia-Purulia 132KV WBSEB 0.00

*Out of service.

DVC Substations in service (Nos.) at a glance

State 220 KV 132 KV

Jharkhand 4 12

West Bengal 6 21

TOTAL 10 33



8



9

Substations

GOMD I GOMD II GOMD III GOMD IV GOMD V GOMD VI

Howrah Kalyaneshwari Jamshedpur Putki Hazaribagh Durgapur

Kolaghat Kalipahari Chandil Patherdih Ramgarh Purulia

Kharagpur Ramkanali Mosabani Sindri Gola ASP

Belmuri Kumardubi Purulia Nimia Ghat Patratu Barjora

Burdwan Burnpur Giridih NorthKaranpura

Barhi

Koderma

Konar

At 33 KVReceiving Stations

GOMD I GOMD II GOMD III GOMD IV GOMD V

Maithon R/Bank Digwadi West Bokaro

Kulti ACC Koderma

Rupnarayanpur Sijua

CLW Katras

Kumardubi Jamadoba

HirapurSeebpur

Lachipur

disergarh



10

Electrical substation model (side-view)

A: Primary power lines' side B: Secondary power lines' side

1. Primary power lines

2. Ground wire

3. Overhead lines

4. Transformer for measurement of electric voltage

5. Disconnect switch

6. Circuit breaker

7. Current transformer

8. Lightning arrester

9. Main transformer

10. Control building

11. Security fence

12. Secondary power lines



11

DVC Power Plants, Dams and Barrages

.

Hydel Power Plant

Maithon

PanchetTilaiya

Thermal Power Plant BTPS (B)

CTPS

DTPSMTPS

Dam Konar

Panchet

Tilaiya Maithon

GT

Maithon

http://www.dvcindia.org/Maithon.htm

http://www.dvcindia.org/Panchet.htm

http://www.dvcindia.org/Tilaiya.htm


http://www.dvcindia.org/powermapfinal.htm

http://www.dvcindia.org/Bokarob.htm

http://www.dvcindia.org/Chandrapura.htm

http://www.dvcindia.org/Durgapur.htm

http://www.dvcindia.org/Mejia.htm










http://www.dvcindia.org/Maithongas.htm








http://www.dvcindia.org/Durgapur.htm

http://www.dvcindia.org/Chandrapura.htm

http://www.dvcindia.org/Bokarob.htm







Address: - CSO building, Area-6, Damodar Valley Corporation,


PIN-828207



1

Introduction

Figure 1 - Transformer Inside View, Workshop

Workshop of DVC do repairing of Transformer and Motor not only for DVC but for other Organisation

too.



2

Transformers Power Transformers:

Power transformers are used to step the voltage up or down. The transformers in the yard mainly have

two physical divisions: one on the cooling arrangement and other on the winding arrangement. There

are two indicator attached to the power transformer:

WTI-> Winding Temperature Indicator

OTI-> Oil Temperature Indicator

Hotspot of the Transformer:-

Hot spot is a place inside the main tank of the transformer where the temperature of winding and

oil are assumed to be maximum. At hotspot an insulated bucket is placed in which a mercury system

sensor is placed to measure the temperature of winding and oil inside the main tank of the

transformer.

The thermo-static sensor is connected through a thermostatic insulated wire system to the WTI and

OTI which gives us the accurate temperature winding and oil of the transformer. WTI and OTI are

equipped with a higher temperature limit switch which sense in case of rise of temperature of

winding and oil and gives us an alarm to maintain the temperature.

Conservator tank of the transformer :

To make up the oil of transformer due to rise and fall of the oil of the transformer. Inside the main

tank of the transformer the compression and expansion of level is maintained by the oil kept in

conservator tank.

Buchholz relay :

Buchholz Relay is a lockout type relay which operates only in the case of internal fault of the

transformer incase if Buchholz Relay operates and gives us an alarm in that condition the

transformer circuit breaker should not be closed in any condition without proper verification of the

Transformer Oil, insulation level of the associated parts and other relevant particle. The Buchholz

Relay is equipped with a necessary contact system which senses in case of above abnormalities. It is

generally operated when any poisonous gas is inhaled by transformer through its silica gel breatheror any other leakage parts.



3

Transformer oil Transformer oil or insulating oil is usually a highly-refined mineral oil that is stable at high temperaturesand has excellent electrical insulating properties. It is used in oil-filled transformers, some types of high

voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and circuit

breakers. Its functions are to insulate, suppress corona and arcing, and to serve as a coolant.

On-site testing

Some transformer oil tests can be carried out in the field, using portable test apparatus. Other tests, such

as dissolved gas, normally require a sample to be sent to a laboratory. Electronic on-line dissolved gas

detectors can be connected to important or distressed transformers to continually monitor gas generationtrends.

To determine the insulating property of the dielectric oil, an oil sample is taken from the device under test,

and its breakdown voltage is measured on-site according the following test sequence:

In the vessel, two standard-compliant test electrodes with a typical clearance of 2.5 mm are

surrounded by the insulating oil.

During the test, a test voltage is applied to the electrodes. The test voltage is continuously increased

up to the breakdown voltage with a constant slew rate of e.g. 2 kV/s.

Breakdown occurs in an electric arc, leading to a collapse of the test voltage.

Immediately after ignition of the arc, the test voltage is switched off automatically.

Ultra fast switch off is crucial, as the energy that is brought into the oil and is burning it during the

breakdown, must be limited to keep the additional pollution by carbonisation as low as possible.

The root mean square value of the test voltage is measured at the very instant of the breakdown and

is reported as the breakdown voltage.

After the test is completed, the insulating oil is stirred automatically and the test sequence is

performed repeatedly.

The resulting breakdown voltage is calculated as mean value of the individual measurements.

http://en.wikipedia.org/wiki/Refining


http://en.wikipedia.org/wiki/Mineral_oil



http://en.wikipedia.org/wiki/Transformer



http://en.wikipedia.org/wiki/High_voltage



http://en.wikipedia.org/wiki/Capacitor



http://en.wikipedia.org/wiki/Lamp_ballast



http://en.wikipedia.org/wiki/Switch



http://en.wikipedia.org/wiki/Circuit_breaker




http://en.wikipedia.org/wiki/Electrical_insulation



http://en.wikipedia.org/wiki/Corona_discharge



http://en.wikipedia.org/wiki/Arcing



http://en.wikipedia.org/wiki/Coolant



http://en.wikipedia.org/wiki/Breakdown_voltage




















4

Motor An electric motor is an electromechanical device that converts electrical energy into mechanical

energy.

Most electric motors operate through the interaction of magnetic fields and current-carrying

conductors to generate force. The reverse process, producing electrical energy from mechanical

energy, is done by generators such as an alternator or a dynamo; some electric motors can also

be used as generators, for example, a traction motor on a vehicle may perform both tasks.

Electric motors and generators are commonly referred to as electric machines.

Electric motors are found in applications as diverse as industrial fans, blowers and pumps,

machine tools, household appliances, power tools, and disk drives. They may be powered

by direct current, e.g., a battery powered portable device or motor vehicle, or by alternating

current from a central electrical distribution grid or inverter. The smallest motors may be found

in electric wristwatches. Medium-size motors of highly standardized dimensions and

characteristics provide convenient mechanical power for industrial uses. The very largest

electric motors are used for propulsion of ships, pipeline compressors, and water pumps with

ratings in the millions of watts. Electric motors may be classified by the source of electric

power, by their internal construction, by their application, or by the type of motion they give.

The physical principle behind production of mechanical force by the interactions of an electriccurrent and a magnetic field, Faraday's law of induction, was discovered by Michael Faraday in

1831. Electric motors of increasing efficiency were constructed from 1821 through the end of

the 19th century, but commercial exploitation of electric motors on a large scale required

efficient electrical generators and electrical distribution networks. The first commercially

successful motors were made around 1873.

Some devices convert electricity into motion but do not generate usable mechanical power as a

primary objective, and so are not generally referred to as electric motors. For

example, magnetic solenoids and loudspeakers are usually described

as actuators and transducers,[1] respectively, instead of motors. Some electric motors are used

to produce torque or force.

http://en.wikipedia.org/wiki/Electromechanics



http://en.wikipedia.org/wiki/Electrical_energy



http://en.wikipedia.org/wiki/Mechanical_energy




http://en.wikipedia.org/wiki/Motor



http://en.wikipedia.org/wiki/Magnetic_fields



http://en.wikipedia.org/wiki/Electrical_conductor




http://en.wikipedia.org/wiki/Electrical_generator



http://en.wikipedia.org/wiki/Alternator



http://en.wikipedia.org/wiki/Dynamo



http://en.wikipedia.org/wiki/Traction_motor



http://en.wikipedia.org/wiki/Electric_machine



http://en.wikipedia.org/wiki/Pumps



http://en.wikipedia.org/wiki/Power_tools



http://en.wikipedia.org/wiki/Hard_drive



http://en.wikipedia.org/wiki/Direct_current



http://en.wikipedia.org/wiki/Battery_(electric)



http://en.wikipedia.org/wiki/Alternating_current




http://en.wikipedia.org/wiki/Electrical_grid



http://en.wikipedia.org/wiki/Inverter_(electrical)



http://en.wikipedia.org/wiki/Electric_watch



http://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity



http://en.wikipedia.org/wiki/Watt_(unit)



http://en.wikipedia.org/wiki/Faraday%27s_law_of_induction



http://en.wikipedia.org/wiki/Michael_Faraday



http://en.wikipedia.org/wiki/Electrical_generators



http://en.wikipedia.org/wiki/Electricity_distribution



http://en.wikipedia.org/wiki/Magnetic


http://en.wikipedia.org/wiki/Solenoid



http://en.wikipedia.org/wiki/Loudspeaker



http://en.wikipedia.org/wiki/Actuator



http://en.wikipedia.org/wiki/Transducer


http://en.wikipedia.org/wiki/Electric_motor#cite_note-0








































5

Figure 2 Core of Induction motor

Figure 3 Connection Diagram of core of Induction motor



6

Figure 4 - Shaft/Rotor of Induction motor



Address:- MHPS, Maithon Dam, Dhanbad, Jharkhand



1

Introduction Maithon Hydel Power Station is located on the river Barakar about 12.9 km above its

confluence with the Damodar near the border of Dhanbad and Burdwan districts of thestates of Jharkhand and West Bengal respectively. The Power Station has a total

generating capacity of 60 MW with 3 units of 20 MW each. Maithon Dam is a unique

underground dam in India, is the first kind of Dam in South East Asia.

Details of Maithon Hydel Power Station

Gen.

Unit Name of

Manufacturers Original

capacity

(MW)

Present

capacity

(MW)

Year of

commissioning Special

features Turbine Generator

1 Neypric Siemens 20 20 Oct., 1957 Horizontalshaft FrancisTurbine

2 Neypric Siemens 20 20 Mar., 1958

3 Neypric Siemens 20 20 Dec., 1958

Figure 1 - Front View Maithon Dam



2

Figure 2 - Inner View Maithon Dam (Shaft and Generator)

Operation

Damodar river is a seasonal river, basically 82% of which is filled up by rainfall in July –September.

1 June to 31 October is the filling period during which rainwater is stored and the stored rainwater is used

for irrigation by the downstream areas of Burdwan, hydroelectric power generation and scores of other

activities.



3

Francis Turbine

In Francis Turbine water flow is radial into the turbine and exits the Turbine axially. Water pressure decreases as it

passes through the turbine imparting reaction on the turbine blades making the turbine rotate. Read more about

design and working principle of Francis Turbine in this article.

Francis Turbine is the first hydraulic turbine with radial inflow. It was designed by American scientist James

Francis. Francis Turbine is a reaction turbine. Reaction Turbines have some primary features which differentiate

them from Impulse Turbines. The major part of pressure drop occurs in the turbine itself, unlike the impulse turbine

where complete pressure drop takes place up to the entry point and the turbine passage is completely filled by the

water flow during the operation.

Design of Francis Turbine

Francis Turbine has a circular plate fixed to the rotating shaft perpendicular to its surface and passing through its

center. This circular plate has curved channels on it; the plate with channels is collectively called as runner. The

runner is encircled by a ring of stationary channels called as guide vanes. Guide vanes are housed in a spiral casing

called as volute. The exit of the Francis turbine is at the center of the runner plate. There is a draft tube attached to

Figure 3- Side-view cutaway of a Francis turbine



4

the central exit of the runner. The design parameters such as, radius of the runner, curvature of channel, angle of

vanes and the size of the turbine as whole depend on the available head and type of application altogether

.

Working of Francis Turbine

Francis Turbines are generally installed with their axis vertical. Water with high head (pressure) enters the turbine

through the spiral casing surrounding the guide vanes. The water looses a part of its pressure in the volute (spiral

casing) to maintain its speed. Then water passes through guide vanes where it is directed to strike the blades on the

runner at optimum angles. As the water flows through the runner its pressure and angular momentum reduces. This

reduction imparts reaction on the runner and power is transferred to the turbine shaft.

If the turbine is operating at the design conditions the water leaves the runner in axial direction. Water exits the turbine through

the draft tube, which acts as a diffuser and reduces the exit velocity of the flow to recover maximum energy from the flowing

water.

Power Generation using Francis Turbine

For power generation using Francis Turbine the turbine is supplied with high pressure water which enters the turbine

with radial inflow and leaves the turbine axially through the draft tube. The energy from water flow is transferred to

the shaft of the turbine in form of torque and rotation. The turbine shaft is coupled with dynamos or alternators for

power generation. For quality power generation speed of turbine should be maintained constant despite the changing

loads. To maintain the runner speed constant even in reduced load condition the water flow rate is reduced by

changing the guide vanes angle.

http://img.bhs4.com/90/3/9037B61A7A12B4B9AA46654EF83AAE811727389A_large.jpg

http://img.bhs4.com/22/9/229E69EF3C03A1C9CF9921D76268EC6F947A1B36_large.jpg



Website reference http://portal.dvc.in

http://dvc.gov.in

Book reference DVC Magazines

DVC booklets

Kumardhubi Sub-station rating file

http://portal.dvc.in/


http://dvc.gov.in/

http://dvc.gov.in/

http://dvc.gov.in/


Damodar Valley Corporation DVC Training Report

Documents

Transcript of Damodar Valley Corporation DVC Training Report