The document details the structure and functions of the Partapur substation in Uttar Pradesh, managed by UPPTCL since 2006, highlighting its role in electricity transmission. It explains various components such as transformers, circuit breakers, insulators, and control systems, emphasizing their functions in voltage transformation, protection, and control. Additionally, it notes the importance of the control room and battery systems, providing insights into the practical knowledge gained from visiting the substation.

1. 18 Nov, 2016

2. Submitted By:
SAKSHI RASTOGI
1473520907
B.TECH FEE

3. UPPTCL, Uttar Pradesh Power Transmission
Corporation Limited is created in 2006. It is responsible
for the planning and managing the transmission of
electricity.
 It has its corporate office Shakti Bhavan at Lucknow.
 The Partapur substation which is situated at Merrut was
established in 1965.

4. A substation is a part of an electrical generation,
transmission, distribution system which transforms voltage
from high to low, or the reverse or perform any of several
other important functions.

5.  To Change voltage from one level to another.
 To Switch transmission and distribution circuits into
and out of the grid system.
 To Measure various parameters.
 To Connect communication signals to the circuits.
 To Eliminate lightning and other electrical surges from
the system.
 To Connect electric generation plants to the system.
 To Make interconnections between the electric systems
of more than one utility.

6.  Switch Yard
 Control Room
 Battery Room

7.  Transformer
 Poly Phase Transformer
 Instrument Transformers
 Current Transformer
Potential Transformer
 Protective devices
 Lightening Arrester
Circuit Breaker
 Insulators
 Isolators
 Conductors

8.  A transformer is a static machine which works on the
law of electromagnetic induction used for
transforming power from one circuit to another without
changing frequency. The main parts of the transformer
are:
Core
Coil
Insulation
Bushings
Conservator
Breather
Buchholz Relay

11. In Partapur substation there are
three transformers
63 MVA 132/33kV (T/F No. 1)
40 MVA 132/33kV (T/F No. 2)
40 MVA 132/33kV (T/F No. 3)

12.  A current transformer (CT) is
a transformer that is used to
produce an alternating current (AC)
in its secondary which is proportional
to the AC current in its primary.
 It converts high input current to
low output current for the purpose
of:
 Instrumentation
 Protection

13.  Potential transformer is a voltage
step-down transformer which
reduces the voltage of a
high voltage circuit to a lower
level for the purpose of
measurement.
 These are connected across or
parallel to the line which is to be
monitored.

14.  It is a protective device which
conducts the high voltage surge
on the power system to ground.
 The lightning arrester provides
protection against surges.

15.  Circuit breaker is mechanical device which is so designed
which controlled under both normal and abnormal
conditions .
 They are used for high capacity.
 A circuit breaker can make or break a circuit either
manually or automatically under all condition viz. no load
and short circuit condition .
 Types of circuit breaker is :
1. Oil circuit breaker
2. Sulphur Hexa Fluoride circuit breaker
3. Air blast circuit breaker
4. Vacuum circuit breaker

17.  Electrical Insulator must be used in electrical system to
prevent unwanted flow of current to the earth from its
supporting points.
 The insulator plays a vital role in electrical system.
Electrical Insulator is a very high resistive path through
which practically no current can flow.
 There are mainly three types of insulator used as
overhead insulator likewise
 Pin Insulator
 Suspension Insulator
 Strain Insulator

18.  Isolator is a manually operated mechanical switch
which separates a part of the electrical power system
normally at off load condition.
 There are different types of isolators available
depending upon system requirement such as
 Double Break Isolator
 Single Break Isolator
 Depending upon the position in power system, the
isolators can be categorized as
 Bus side isolator
 Line side isolator
 Transfer bus side isolator

19. Conductor is a physical medium to carry electrical energy
form one place to other. It is an important component of
overhead and underground electrical transmission and
distribution systems.
ACSR Conductor Voltage (KV) Current Carrying
Capacity (A)
Dog 66 140
Panther 132 180
Zebra 220 200
Moose 400 250

21.  All the equipments are controlled from the control
room. Control panels are installed in the control room.
 All the relays and metering devices are fitted in the
control panel.
 Any transformer, circuit breaker can be controlled from
these panels.
 To measure current, voltage, power factor, frequency
various types are metres are fitted in the panel.

23.  When more than one cells are connected together, it will
be a battery.
 The battery room is also known as heart of the substation.
 Substation batteries typically provide DC supplies for
protection and control equipment (principally relays), and
also provide trip and close current to circuit breakers.
 In substations rechargeable batteries are used.
 In Partapur substation there are 55 cells are connected in
series. Each cells are of 2 volts. So the total voltage will be
110 volt. The capacity of battery is 300 Ah.

25. After visiting the substation I get the practical knowledge
about the working, protection, & control of various
equipment of electrical system. By visiting the site I
explored the technical as well as administrational work on
the substation.