33/11 KV SUB-STATION, VIBHUTI KHAND, GOMTI NAGAR, LUCKNOW

UTTAR PRADESH POWER CORPORATION
LIMITED (UPPCL)
1

UTTAR PRADESH POWER CORPORATION
LIMITED
33/11 KV SUB-STATION, VIBHUTI KHAND, GOMTI NAGAR, LUCKNOW
Presented By:-
SATYA PRAKASH CHAURASIA
Class Roll No. – 107
University Roll No. - 1505420906
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S No. Title
1 Introduction
2 Substation
3 Description of substation
4 Single Line Diagram
5 Transformer
6 Lightening Arrestor
7
8
9
10
Insulator
Circuit Breaker
Relay
Conclusion
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INTRODUCTION
The creation of Uttar Pradesh Power Corporation Ltd.
(UPPCL) on January 14, 2000 is the result of power sector
reforms and restructuring in UP (India) which is the focal point
of the Power Sector, responsible for planning and managing
the sector through its transmission, distribution and supply of
electricity.
UPPCL will be professionally managed utility supplying reliable
and cost efficient electricity to every citizen of the state
through highly motivated employees and state of art
technologies, providing an economic return to our owners and
maintaining leadership in the country.
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What is Electrical Sub-Station
Substation:-
An electrical substation is a station of an electricity generation,
transmission and distribution system where voltage is
transformed from high to low or the reverse using
transformers.
Function of the substation:-
The sub-station receives power from the generating station by
a single or more feeders at a high voltage, transform the same to
the different distribution voltages and sends different consumers
through distribution network.
5

6
DESCRIPTION OF 33/11KV SUBSTATION GOMTI NAGAR

TRANSFORMERS
Also known as the heart
of substations. These are
used to reduce the
voltages at appropriate
levels.
CURRENT VOLTAGE
TRANSFORMERS
It is a used in power
systems to step downextra
high voltage signals and
provide a low voltage signal,
for measurement or to operate
a protective relay.ISOLATORS
Used for maintenance of
the circuit in no load
condition.
CIRCUIT BREAKER
Used to protect the
eqiupment by opening
the circuit for over current
and over voltages
LIGHTINING ARRESTER
Used for protecting the
equipment from surge
voltages.
MAIN EQUIPMENTS AT 33/11 KV
SUBSTATION GOMTI NAGAR8

LIGHTINING ARRESTER
Lighting Arrester is
a device used to
protect the
insulation and
conductors of the
system from the
damaging effects
of lightning.
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TRANSFORMER
A transformer is a static piece of apparatus by means of which electric
power in one circuit is transformed into electric power of the same
frequency in another circuit.
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CURRENT TRANSFORMER
 Current transformers are used for
reducing or stepping down A.C. current
from higher value to lower for
measurement protection or control.
When current in a circuit is too high to
apply directly to measuring instruments,
a current transformer produces a
reduced current accurately proportional
to the current in the circuit, which can be
conveniently connected to measuring
and recording instruments.
 A current transformer isolates the
measuring instruments from what may
be very high voltage in the monitored
circuit.
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POWER TRANSFORMER
 These are parallel connected type of instrument transformer.
 A potential transformer is just like general purpose step down transformer.
 PT has lower turns winding at its secondary.
 TYPES OF POWER TRANSFORMER
 Step Up Transformer & Step Down Transformer
 Three Phase Transformer & Single Phase Transformer
 Electric Power Transformer, Distribution Transformer & Instrument
Transformer
 Two Winding Transformer & Auto Transformer
 Outdoor Transformer & Indoor Transformer
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INSULATOR
It provide insulation between
line conductors and supports
and thus prevent any leakage
current from conductor to
earth.
PURPOSE:-
• Support
• Break the current
TYPE OF INSULATOR:-
1. Pin Insulator
2. Suspension Insulator
3. Strain Insulator
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CIRCUIT BREAKER
 A circuit breaker is an automatically operated electrical switch designed to
protect an electrical circuit from damage caused by overload or short circuit.
Its basic function is to detect a fault condition and interrupt current flow.
 Unlike a fuse, which operates once and then must be replaced, a circuit
breaker can be reset (either manually or automatically) to resume normal
operation.
 A circuit breaker essentially consists of fixed and moving contacts. These
contacts can be opened manually or by remote control whenever desired.
When a fault occurs on any part of the system, the trip coils of breaker get
energized and the moving contacts are pulled apart by some mechanism,
thus opening the circuit.
 .
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THE MAIN FUNCTION OF CIRCUIT BREAKER
1. It carries current continuously
without heating.
2. Opens or close the circuit
when required.
3. It protects the circuit in case of
any fault.
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Sulphar hexafluoride circuit
breaker (SF6)
Sulphar hexa fluoride (SF6) gas is
used as the arc quenching medium
. The SF6 is an electronegative gas
and has a strong tendency to
absorb free electrons. Circuit
breakers have been developed for
voltage 115KV to 230KV , power
rating10 MVA.
Vacuum circuit breakers
Vacuum circuit breakers are
circuit breakers which are used to
protect medium and high voltage
circuits from dangerous electrical
situations.
Air-blast circuit breaker
Fast operations , suitability for repeated
operation , auto reclosure , unit type multi
break constructions ,simple assembly,
modest maintenance are some of the main
features of air blast circuit breakers. A
compressors plant necessary to maintain
high air pressure in the air receiver.
Oil circuit breaker
A high-voltage circuit breaker
in which the arc is drawn in
oil to dissipate the heat and
extinguish the arc; the
intense heat of the arc
decomposes the oil .
DIFFERENT CIRCUIT BREAKERS
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RELAY
 When a failure occurs on any part of the system, it must be
quickly detected and disconnected from the system.
 For high voltage circuits relays are employed to serve the
desired function of automatic protective gear. The relays
detect the fault and supply the information to the circuit
breaker.
 Function of Relay :-
 Relays are switches that open and close circuits
electromechanically or electronically. Relays control
one electrical circuit by opening and closing contacts in
another circuit.
.
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Relays used in control panel of the substation:
Differential Relay
A differential relay is one that operates when
vector difference of the two or more
electrical quantities exceeds a
predetermined value.
Overcurrent Relay
This type of relay works when current in the
circuit exceeds the predetermined value.
These relay are used on A.C. circuit only can
operate for fault flow in the either direction.
This relay operates when phase to phase
fault occurs.
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 Directional Relay
This relay operates during earth faults. A directional
power relay is so designed that it obtains its operating
torque by interaction of magnetic field derived from both
voltage & current source of circuit it protects.
 Tripping Relay
When main relay sense any fault in the system, it
immediately operates the trip relay to disconnect the
faulty section from the section.
 Auxiliary Relay
An auxiliary relay is used to indicate the fault by glowing
bulb alert the employee.
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CONCLUSION
During my training, there I developed my team work,
analytical thinking & various important information about
electric power system. The main objective of this whole
training program is to provide an opportunity to identify,
observe & practice how engineering is applicable in the real
industry.
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33/11 KV SUB-STATION, VIBHUTI KHAND, GOMTI NAGAR, LUCKNOW

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