INTERSHIP - GANDHINAGAR THERMAL

POWER PLANT

Internal Guide - A.M.UPADHYAY

Submitted BY - Odedara
Deepak (2202080109074)
ABOUT THE COMPANY- GTPS
Established in 1977, located at Gandhinagar, Gujarat.
Operated by Gujarat State Electricity Corporation
Limited (GSECL).
Installed capacity: 871 M W (5 Units: 120 M W × 2 +
210 M W × 3
+ 1 M W Solar)
Fuel: Coal-based Thermal Power
Plant. Supplies electricity to the
state grid.
Focus areas: Effi cient generation, environmental
compliance, and safety in operations.
OVERVIEW OF VARIOUS DEPARMENTS

1.Switchyard Department
Handles transmission of generated power at
220 kV & 400 kV levels.
Equipment: Step-up transformers, CTs, PTs,
isolators, circuit breakers, lightning arresters,
bus couplers.

2. Electrical Maintenance Department

Maintenance of power transformers, station
transformers, HT/LT motors, switchgear
panels.
Preventive and corrective maintenance of
OVERVIEW OF VARIOUS DEPARMENTS
3. Testing Department
Conducts specialized testing of transformers,
CT/PTs, relays, alternators.
Uses advanced tools: Omicron relay test kit,
Megger insulation tester, HV test set.
Calibration of protective relays and verification of
tripping logic.

4. CPEM – Coal Plant Electrical Maintenance

Focuses on electrical systems of Coal Handling Plant
(CHP). Maintains conveyor belt motors, crushers,
stacker–reclaimer drives, and wagon tippler
equipmen.t
Ensures uninterrupted coal feeding to the boiler for
 ✅DO’S FOR INTERN
• Always wear helmet and safety shoes inside plant premises.
• Maintain discipline, punctuality, and professional
communication.
• Ask doubts to engineers/supervisors instead of
attempting tasks without knowledge.
• Walk only on designated pathways, avoid restricted or high-
risk areas without permission.
• Stay alert to alarm sounds, hazard indicators, and warning
sign boards.
• Report any abnormal noise, smell, or sparking immediately
to mentor/supervisor.
• Strictly comply with plant photography restrictions unless
authorized.
 ❌DON’TS FOR INTERN
Do not touch or operate any equipment without
permission. Avoid use of mobile phones inside
restricted zones.
Do not enter HT/LT switchgear rooms, turbine floor, or
boiler areas without supervision.
Never ignore alarm signals, warning boards, and
hazard signs. Never attempt to repair/replace fuses,
relays, or connections without guidance.
Avoid casual behavior such as running or
sitting near equipment.
 ROLE AS
INTERN
1) As an Individual :
Learned maintenance procedures of HT/LT
motors, transformers, and alternators.
Studied 220 kV Switchyard layout and
Single Line Diagram
(SLD).
Learned synchronization process of GTPS units with
the state grid.
Gained exposure to S C A D A- based monitoring and
protection
relay logic.
Observed maintenance of coal conveyor motors,
crushers, stacker–reclaimer drives, and wagon
tippler systems.
Understood role of electrical maintenance in
ensuring.
 ROLE AS INTERN
2) As a Team member :
Assisted engineers during preventive maintenance of
switchyard breakers, coal handling motors, and control
panels. Participated in relay testing, secondary injection
testing of CT/PT, and calibration of measuring
instruments under supervision.
Supported C P E M team in troubleshooting coal
conveyor motor starters, control relays, and PLC-based
systems.
Engaged in safety toolbox talks and departmental
discussions
to align with work protocols.
Contributed to team-based observation reports
 LITERATURE STUDY
📘 Switchyard
→
Power System Protection and Switchgear by Badri
for
Ram grid protection & switchyard schemes.
CEA (Central Electricity Authority) guidelines on
220/400 kV switchyard safety and operations.
Case Study: Performance Analysis of EHV Substations →
practical reference for S C A D A and relay coordination.
 LITERATURE STUDY
📘 Electrical Maintenance Department
Switchgear and Protection by Sunil S. Rao → for
understanding circuit breakers, relays, CT/PT concepts.
GSECL O&M Manual → preventive maintenance
schedules of
HT motors, alternators, and switchgear.
I E E E Paper: Condition Monitoring of Rotating Machines →

relevance in motor testing and insulation resistance

checks.
 LITERATURE STUDY
📘 Testing Department
I E E E Std. C57.12 → testing and diagnostics for
transformers. Megger application notes: Insulation
Resistance Testing Best Practices.
Case Study: SF6 Circuit Breaker Reliability & Testing →
insight
into high-voltage breaker health monitoring.
 LITERATURE STUDY
📘 CPEM – Coal Plant Electrical Maintenance
Power Plant Engineering by P.K. Nag → for coal
handling & boiler-feed electrical auxiliaries.
Research article on Coal Handling Plant Reliability
Analysis
(CHP failures & preventive measures).
GSECL training manual on M C C panels and motor
starter maintenance.
 FUNDAMENTAL
CONCEPTS
APPLIED DURING INTERNSHIP
🔹 Switchyard
Per-Unit System & Short Circuit Analysis → to
understand fault currents and relay settings.
Transformer Equivalent Circuit → applied in step-up
transformer testing and load sharing.
Protection Principles (Overcurrent, Differential,
Distance protection) → observed in relay
coordination.
 FUNDAMENTAL
CONCEPTS
APPLIED DURING INTERNSHIP
🔹 Electrical Maintenance Department
Ohm’s Law & Insulation Resistance → applied in
Megger testing of motors/transformers.
Power Factor & Effi ciency → used in analyzing
auxiliary motor
performance.
Magnetic circuits & losses → for understanding
alternator & motor testing.
 FUNDAMENTAL
CONCEPTS
APPLIED DURING INTERNSHIP
🔹 Testing Department
Dielectric Theory & Capacitance Testing → applied in Tan
Delta and HV tests.
Transformer EMF equation & winding resistance → used
during
diagnostic tests.
Current & Potential Transformer Ratios → applied during
CT/PT testing and calibration.
 FUNDAMENTAL
CONCEPTS
APPLIED DURING INTERNSHIP
🔹 CPEM (Coal Plant – Electrical Maintenance)
Three-phase induction motor theory → applied to
conveyor, crusher, and reclaimer drives.
Starter & Protection Circuits → role of DOL, star-delta,
and
soft starters in M C C panels.
PLC Logic Basics → used in automation of coal
conveyor systems.
MODERN TOOLS, SOFTWARE
& CALCULATIONS USED
🔹 Testing Instruments
• Megger Insulation Resistance Tester → to check I R
values of HT motors, transformers, alternators.
• Tan Delta Test Kit → dielectric loss measurement of
transformer
insulation.
• Omicron Relay Testing Kit → secondary injection
testing of protection relays (overcurrent, differential,
distance).
• High Voltage (HV) Test Set → withstand tests on
CT/PT and
MODERN TOOLS, SOFTWARE
& CALCULATIONS USED
🔹 Software & Systems
S C A DA System → real-time monitoring of
switchyard parameters (voltage, current, breaker
status).
AutoCAD → reading/modifying S L D s and wiring
diagrams of
panels.
Excel/Calculation Sheets → load flow calculations, test
data tabulation, I R trend analysis.
 PROFESSIONAL SKILLS
DEVELOPED
Technical Skills
Hands-on exposure to switchyard operations, relay
testing, M C C panel maintenance.
Practical understanding of transformer diagnostics,
motor testing, and coal handling plant auxiliaries.

Teamwork & Communication

Worked in teams across four different departments.
Learned to document, discuss, and present findings
effectively.
 PROFESSIONAL SKILLS
DEVELOPED
Professionalism
Time management, report preparation, and official
communication.
Adaptability to different teams and work
environments.
 PMMS /
GOOGLE CHECKLIST
CLASSROOM

Activity Status

Weekly Diary Upload ✔

Monthly Attendance ✔

First Internal Presentation ✔

Internship Report ✔

Completion Letter ✔

Feedback by Intern ✔
 TECHNICAL CHALLENGES
&PROFESSIONAL GROWTH
🔹 Challenges Faced
Diffi culty in interpreting complex switchyard
protection schemes during initial days.
Understanding relay coordination and S C A D A
operations was
challenging without prior exposure.
Practical testing (IR, Tan Delta, HV test) required
precision and careful observation.
Exposure to coal handling plant motors and PLC
systems
demanded quick learning of automation basics.
 TECHNICAL CHALLENGES
&PROFESSIONAL GROWTH
🔹 Motivation & Growth
Support from mentors and team encouraged
continuous questioning and learning.
Applied fundamental concepts of electrical engineering
to real- world systems → boosted confidence.
Learned to approach problems with a lifelong learning
mindset instead of short-term fixes.
Developed ability to adapt quickly in multidisciplinary
environments (generation, transmission, coal handling,
testing). Internship experience motivated me to pursue
higher studies and research in power systems &
embedded applications for power plants.