GAGAN

VISVESVARAYA TECHNOLOGICAL UNIVERSITY BELAGAVI
INTERNSHIP REPORT ON
“TUNGABHADRA DAM POWER HOUSE’’

(ELECTRICAL POWER GENERATION FROM HYDRO POWERPLANT)
Electrical & Electronics Engineering

during the year
2022-23
INTERNSHIP BY
GAGANDEEP .K [3PG20EE410]
PROUDHADEVARAYA INSTITUTE OF TECHNOLOGY,

DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
T.B. DAM, HOSAPETE-583225
Under the Guidance of

HOD Prof. Firdose P. M.Tech PRINCIPAL
Prof. PRAKASHA .S M.TECH. (PhD) Dr. Rohith U M
04/09/2023 SAssistant
A M P L E FProfessor
OOTER TEXT 1
04/09/2023 SAMPLE FOOTER TEXT 2
CONTENTS
Control and Protection System
Control and Protection Boards

 Metal enclosed switchgear
 Station power supply facilities
 Auxiliary systems
Protection Systems of TBDPH
 Overload Relay
 Over current Relay
Circuit Breakers
 SF6 Circuit breaker
 Technical specification for 66KV SF6 circuit breaker
 General design features of circuit breaker
 Breaking capacity
 Restriking voltage
Recovery voltage and power factor
CONTROL AND PROTECTIVE SYSTEM
1.Control & Protection Boards
 The existing generator-transformer boards were replaced with new designed Control and Protection
boards.
 Control and Protection Boards are composed of two Unit Control Board, one 132kV Switchyard
Control Board and Recording Board.
 The Control and Protection Boards are integrated type. Unit Control Board has sequence controller,
automatic synchronizer and HMI (Human Machine Interface).
 Each unit can connect in parallel with power system automatically by using automatic
synchronizer. The Control and protection Boards were manufactured by Toshiba in Japan.
Control Room
Metal Enclosed Switchgear
• 11kV Metal Enclosed Switchgears are composed of 11kV Generator incoming cubicle,
11kV Link cubicle, 11kV VCB cubicle, 11kV Station service transformer cubicle and
NGR cubicle.
• The existing 11kV Metal Enclosed Switchgears and Service Transformers were replaced
with new ones.
• The 11kV Metal Enclosed Switchgears were transported inland with all accessories
including supporting structures, spares, and all other equipment making the 11kV
system.
Switch Gears
Station Power Supply Facilities:
• Station Power Supply Facilities are composed of Battery, Battery Charger, AC & DC power
supply boards.
• The existing Station Power Supply Facilities were replaced with new ones Battery, Battery
Charger, DC power supply board were manufactured by Station Power Controls Ltd.
• AC power supply boards were manufactured by Larsen & Toubro Limited.
Battery Room
Auxiliary Systems
During our intern period we saw different types of auxiliary systems used in MBDPH. The systems are
Lube Oil pumps, Outdoor lighting and receptacles, Control house, Heating and ventilation, Chiller Air
conditioning, Battery charger input and Motor-operated switches etc
Protective System of TBDPH
Overload Relay:
Overload relays are designed to meet the special protective needs of motor control circuits. Overload
relays allow harmless temporary overloads (such as motor starting) without disrupting the circuit will trip
and open a circuit if current is high enough to cause motor damage over a period of time can be reset once
the overload is removed.
Circuit Breakers
SF6 Circuit Breaker:

• SF6 is inert gas the property of this gas the higher pressure and temperature its dielectric strength will
be SF6 has two gas chamber when contract is close the pressure is two chamber have the same
pressure but when the contract is open the none of the chamber get totally close and other remain
open, there is an arrow channel between two chamber and when contract open the SF6 flow a plane of
high pressure region to the low pressure region there will be turbulence of SF6.
SF6 Circuit Breaker
Technical Specification For 66 kV SF-6 Circuit Breaker:

This section covers the design, manufacture, testing, inspection, supply and delivery of 66KV Circuit
Breakers SPRING operated, along with associated accessories and complete in all respects specified in
the schedule of requirements.
Restriking Voltage:
• The circuit breakers shall be capable of interrupting the rated power when the restriking voltage
has a frequency of not less than 400 Hz and with a restriking voltage having frequency of 2000 Hz.
• The circuit breakers shall be capable of interrupting at least 50% of nominal breaking capacity.
• The measures adopted for ensuring proper operation at high rate of rise of restriking voltage and
for limiting the actual voltage values across the breaks shall be described in the tender.
Recovery Voltage & Power Factor:
The circuit breaker shall be capable of interrupting the rated power with recovery voltage equal to the
rated maximum line to line service voltage at rated frequency and at a power factor not exceeding 0.15.
The circuit breakers shall also be capable of satisfactory operation even under conditions of phase
opposition that may arise due to faulty synchronizing.
THANK YOU

GAGAN

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VISVESVARAYA TECHNOLOGICAL UNIVERSITY BELAGAVI

“TUNGABHADRA DAM POWER HOUSE’’

Electrical & Electronics Engineering

PROUDHADEVARAYA INSTITUTE OF TECHNOLOGY,

Under the Guidance of

Control and Protection Boards

SF6 Circuit Breaker:

Technical Specification For 66 kV SF-6 Circuit Breaker:

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