IRJET- IoT based Feeder Protection from Overload and Earth Fault

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4550
IOT Based Feeder Protection From Overload and Earth Fault
Kalpana Patel1, Nikhil Bagul2, Rohit Badodekar3, Manish Patil4 , Vinod Nikumbh5
1Assistant prof., Dept. of Electrical Engineering, D. N. Patel College of Engineering, Shahada, India
2,3,4,5 UG Student, Dept. of Electrical Engineering, D. N. Patel College of Engineering, Shahada, India
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Abstract - The revolution has been brought within the
modern world by Internet of Things based technology after
its discovery in the field of computer and internet. Thus we
can practice the concept of IOT technology in the power
system. Today the world is moving fast towards the more
operative and well-organized smart grid technology by
switching the existing timeworn technology with the new
smart grid technology. Hence we can make use of both the
technologies in order to make the existing power system
more operational and well organised. IOT and smart grid
leads to a perfect combination of two expertise which will
result in enhancement of the present power structure of
India. In adding to that there will be many benefits of
using this expertise. Many existing problems that are
present in the conventional power grid structure can be
solved. The motive of the paper is to improve the sharing
out of power in India where problems like load shedding a
common situation.
Key Words: Revolution, Internet of Things, Smart Grid,
Power System, Load Shedding.
INTRODUCTION
The revolution has been brought in the modern world by
Internet of things based technology after its discovery in the
field of computer and internet. Thus we can use the
conception of IOT technology within the grid. In electric
power distribution, an programmed overload defence
system which is a circuit breaker fitted out with a
mechanism that can without human intervention closes the
breaker after it has been opened up due to a fault. These
circuits are mostly prone to the temporary faults such as
shorting or overload. Withorthodoxfuseorcircuit breaker,a
fault would blow the fuse or open the breaker and thus
immobilizes the line till a techniciancouldmanuallyreplaces
the blown fuse or closes the circuit breaker. But the
automated overload protection system can make many pre-
programmed efforts in order to re-energize the line. If the
fault has been cleared, the circuit breaker of the automated
overload protection system will stay closed and power line
resumes to function in the normal operation. Today the
planet is moving fast towards the more operational andwell
organised smart grid structure by substituting the present
timeworn expertise with the smart grid technology. So we
can make use of both the knowledges in order to make the
present power system more operational and well organised.
Smart grid and IOT will be a picture-perfect combination of
two know-hows which will result in enhancement of the
present power structure associated with India.
PROBLEM STATEMENT
Protection of the power system is very important concernin
the design of electrical power system. We need to protect
these electrical power system components from dangerous
fault effects. This not only improves the life of the
components but also sidesteps unnecessary expenses in
frequent replacement of outmoded components. It
guarantees continuous power supply in order to assist the
needs of the overgrowing economy. This project therefore
pursues to project a system based on micro-controller that
will shrewdly monitors the faults and prompts a safety
measures in order to guard the feeder in the event of power
overloading.
Objectives:
The main intent of this paper is to design and implement a
system with the support of microcontroller and other
peripheral devices to look after power transformer. To
achieve this the following work must be done.
a) Design and build an over current relay using
microcontroller and a current sensor
b) Development, examination and calibration of the
current sensor.
c) Development of the ADC program to convert the
analogue sensor output to equivalent digital form
within the microcontroller.
d) Development of LCD program in order to display
the sensed levels.
e) Enhancement of warning (audio and visual) plus
relay control system program.
f) Over current protection counter to earth faults.
g) Automatic reclosing
h) Relay co-ordination for earth fault relays.
EXISTING SYSTEM
In Existing system, the load current isincreasinginnature so
it will directly influence to the consumers equipment and
utility side customers. The equipment connected in
consumer side will be ruin due to over current flows in the

circuit. No specific controller is installed in a power lines for
the tenacity of fault recognition. The existingsystemwas not
able to detect the faults like short circuit of feeders, feeder
overloading and earth faults because of probabilities of
collapsing the equipment due to extra large over load
current.
PROPOSED SYSTEM
In order to overcome the circumstances like overloading of
feeders or short circuit in feeders which we discussed inlast
paragraph, we have planned a simple prototype model of
Feeder Protection in the event of Overload plus Earth Fault
Relay in order to prove the conception in detail. In our
project we have used current sensors with feeders in series
in order to intellect the fault like short circuit condition or
over load condition. After detecting the fault, our micro-
controller will send signals to overload unit for tripping the
relay instantaneously. It also sends message with the help
IOT module by marking out the position when earth fault or
overload is sensed.
CIRCUIT DESCRIPTION
The diagram shows the complete circuit implementation of
the proposed system “IOT Based Feeder ProtectionSystem”.
The system consists of a microcontroller used to control
whole system.
In this system Atmega328P microcontroller was
used which will act as the brain of the system and controls
the hardware of the system. This microcontroller and other
components in the circuit require power supply for their
functionality.Themicrocontrollerworksonregulated5V DC
supply. To fulfill this power requirement of the circuit we
have designed power supply entity which provides 12V and
regulated 5V power supply as per the requirement of the
circuit component. To design power supply unit step down
transformer is used. mains supply of 230V is applied to
primary of this transformer and at secondary side it gives
stepped down supply of 12V. Since circuit components
require DC supply, bridge rectifier circuitisdesignedusing4
diodes to convert the AC supply to the DC. The obtained 12V
AC supply from the secondary of thetransformerisfedto the
rectifier circuit and DC supply is obtained at its output
terminal. Microcontroller requires regulated 5V supply, to
get this voltage supply we are using a LM-7805 voltage
regulator IC. This IC has 3 terminals Vin, GND and Vout. To Vin
terminal of regulator IC 12V supply is applied, the GND
terminal of IC is associated with the ground voltage supply
and at the output terminal i.e. Vout terminal of IC we get
regulated 5V supply. Two parallel connected capacitors are
also used in the power supply unit. These capacitors act as
filters for complete elimination of theripplefromthesupply.

1000pf and 100pf capacitors are used for that purpose and
connected at input and output sideways of voltage regulator
IC respectively. This obtained regulated supply of 5V is
provided to pin number 7 i.e. VDD pins, 20 and 21 of the
microcontroller IC. Pin number 8 and 22 of the controller IC
are allied with the ground. To reset the controller in any
condition if required a reset switch is connected to pin
number 1 which is reset pin of the controller. By resetting, it
puts the microcontroller into a well-known state in such a
way that the execution of program starts from 0 address of
program memory. All microcontrollersencompassa clock or
an oscillator in order to operate Clock is make available by
connecting microcontroller withthe external timingdevices.
The instructions are executed by bringing it from the
memory and afterwards decoding it. The procedure takes
few clock cycles well known as instruction cycles. To obtain
these instruction cycles a crystal oscillator is allied with the
micro-controller. This crystal oscillator includes a 16MHz
quartz crystal and two 33pf capacitors connected to the pin
number 9 and 10 i.e. PB6 (TOSC 1) and PB7 (TOSC 2) of the
controller IC.
The system is designed to defend the feeder from
overload and over current in the load as well as to monitor
and protect the earth fault. For this we have used 3 lamps
asload for the system. These are associated to feeder lines.
To measure the load current we have interfaced a current
sensor ACS712 in series with the feeder lines and loads. The
output of this sensor is of analog form. The sensor output is
provided to the microcontroller. For this the Vout pin of
sensor is linked to pin 24 of the controller IC for process.
A relay is interfaced with the microcontroller
through a transistor which is used to disconnect the load
when the system obtains overload connected tofeederlines.
The relay output is connected to the feeder lines for the
purpose of tripping.
To check earth fault we have connected a Lamp as
load to the mains three phase supply. When the voltage
between phase line of the mains supply and earth is 230V
then the earthing of the supply is perfect. But if the voltage
goes low then earthing of the mains supply is leaked andit is
detected that earth fault is occurred in the system. To
monitor this we are using a 9V transformer along with
bridge rectifier. The bridge rectifieroutputisprovidedto pin
number 25 of the microcontroller for comparison. Also to
measure the current of this load another current sensor is
interfaced with supply mains and output of which is
delivered to the microcontroller. TheVout pinofthissensoris
attached to the pin 23 of micro-controller. One more relay is
practiced in order to trip this load from the supply when the
fault is occurred in the system. This relay interfacedwiththe
microcontroller through a transistor and connected to the
pin number 12 of the controller IC. The relay output is given
to this mains supply to trip the load from the supply.
The system consists of 16x2 LCD display, which is
used to display the readings of the load current by the
current sensor. This LCD display is interfaced in the 4 bit
mode with the microcontroller. In 4-bit mode. This mode
therefore saves four pins of the controller distinct 8-bit
mode. In the case of 4-bit mode simply 4 bit data is sent to
the LCD. Since 8-bit micro-controller comprises data in8-bit
form so we can divide data into 2 nibbles. First higher 4-bits
are sent to LCD and after lower 4-bits. D4, D5, D6, D7 data
pins of the LCD are incorporated within the 4-bit mode. D1,
D2, D3, D4 remains empty. Least significant bit is D4 and
highest significant bit is D7. Port-PB first 4 bits (PB5, PB4,
PB3, PB2) of the controller IC are used to send 4-bitdata and
commands to LCD. These four Pins(PB5,PB4,PB3,PB2) are
Connected to four pins of LCD (D4,D5,D6,D7). Port-PB1 pin
no 15 is connected to RS (register select) pin of LCD. Port-
PB0 pin no 14 is linked to E (Enable) pin of 16x2 LCD. The
hardware of the system includes a Wi-Fi module which is
interfaced with the microcontroller is used to transmit all
the data wirelessly to the internet. This Wi-Fi module is
interfaced with the microcontroller. The transmitter
terminal of the Wi-Fi module is linked with the receiver
terminal of micro-controller whereasthe receiverterminal is
linked to the transmitter terminal.
WORKING
For the protection of bus bar from over current
situation firstly we need to evaluate the total load current
which is running through our bus bar. Here we are using
current sensor for measuring the load current and this
current sensor output is sent to ADC for converting analog
output of current sensor into digital data. Then this ADC
output is given to the microcontroller for monitoring
purpose. When current increases beyond certain limit , then
we will trip the load by using relay. Inside our project, we
have used 230V bulb as load. We are going to risetheloadby
increasing the number of loads ON. When we will ON more
number of loads it will cause overload state and then
microcontroller will identifies this and trips the total load
with the support of relay. In our project, we are using 12v
relay for the purpose of tripping. Also, we are using a Wi-Fi
modem to transmit all the measured parameters i.e. load
current over the internet. This data will be display on the
android mobile phone of the user in which the BLYNK
application is installed and a project is designed in this
application for this system. The resultant leakage current is
significantly less than the short circuit current. The earth
fault may remain continue for a longer duration and causes
considerable damage before if eventually advances into a
short circuit and removed from the system under these
circumstances ,it is money-spinning to service earth fault
relay, which is fundamentally a low setting over current
relay and it operates when earth-fault or leak develops. This
system is used for the transformerwindingconnectedinstar
where neutral point is solidly earthed through the
impedance. The high impedance type relay is used to meet
the scheme for external fault.
In such three phase system, if any of the three
phases gets grounded then this will cause currentimbalance
situation, the vector sum of all three phases will havecertain

specific value. If this value exceeds beyond the set value
specified on the relay, then the relay will actuate and trip
the main circuit. The primary winding of the distribution
transformer or any other transformer is premeditated to
operate at certain specific current, if the current flowing
through that instrument is extra than the ratedcurrent,then
instantly the System may damage due to over load, with the
help of this project we are going to protect the bus bar from
over load condition.
Whenever the over current occurred the circuit is
going to trip. In order to trip the circuit, we are using one
relay which can be controlled through micro-controller.
When overload has occurred relay is going to trip the total
circuit and buzzer will on in order to indicate the over load
condition.The information about fault occurred due to
overload condition will be sent on internet for wireless
monitoring purpose. To send the data overtheinterneta Wi-
Fi module is used in this system and is interfaced with
microcontroller. We use BLYNK platform for data receiving
and controlling purpose.
ADVANTAGES
a) Efficient and low cost design.
b) Low power consumption.
c) Real time monitoring.
d) Manually and Automatically operated
e) Accurate time Breaking mechanism
DISADVANTAGES
a) The cost of a microcontroller can get pretty
expensive.
b) Programming can also take longer time to
accomplish than circuit analysis.
c) Error in the programming is possible
APPLICATIONS
a) This system can be implemented for protecting
Busbars in sub stations and generating stations.
b) It can also be used for Industrial appliances
protection.
c) For monitoring and regulatingthehomeappliances.
CONCLUSIONS
In our paper, we examine design to achieve control &
monitoring of overload condition of feeder lines by
measuring the temperature of line. In this project we have
designed a system such that it will monitor and control the
load constantly and that information is sent to user with the
help Wi-Fi module
Today the world is touching more operative and
well organised smart grid technology by replacing the
current timeworn technology by the smart grid technology.
So we can make use of both expertise to make the existing
power system more operative and well organised. smart
grid and IOT will be a flawless combination of two expertise
which will result in upgradation of the current power
structure of India. In adding to this there will be so many
benefits of using technology ahead. Many existing problems
that are present in the conventional power grid structure
can be solved through this system. Themotiveofthepaperis
to improve the distribution of power in India where
problems like load shedding is a common situation arising.
FUTURE SCOPE
Today the world is moving fast towards the more operative
and well-organized smart grid technology by switching the
current time worn technologies by the smart grid
technology. Thus we can make use of both the expertise in
order to make the present powersystemmoreoperativeand
well organised. smart grid and IOT will bea perfectamalgam
of two know-hows which results in improvement of the
current power structure of India. In adding to that there are
many such benefits of using technology. Many current
problems that are present in the existing power grid
structure can be solved out. The motive of the paper is to
enhance the sharing out of power in India where hitcheslike
load shedding a common situation.
REFERENCES
[1] Amit Sachan, “Microcontroller based substation
monitoring and control system with GSM modem” ISSN:
2278-1676 Volume 1, Issue 6 (July-Aug. 2012), PP 13-21
[2] Natalie Matta, Rana Rahim-Amoud, Leila Merghem-
Boulahia, Akil Jrad, “A wireless sensor network for
substation monitoring and control in the smart grid” (IEEE)
[3] M. Kezunovic, Y. Guan, M.Ghavami, “New concept and
solution for monitoring and control system for the 21st
century substation” (IEEE)
[4] Hao liang , Bong jun Choi , Atef Abdrabou , Weihua
Zhuang and Xuemin(Sherman) shen,” Decentralized
Economic Dispatch in Microgrids via Heterogeneous
Wireless Networks” ,IEEE Journal on selected Areas in
Communications: Smart grid Communications, vol
30,no.6,pp.1061-1074,July 2012
[5] B. Belvedere, M. Bianchi, A. Borghetti, C. A. Nucci and M.
Paolone et al "A Microcontroller-Based Power Management
System for Standalone Microgrids with Hybrid Power
Supply" IEEE Transactions on Sustainable Energy, vol. 3,
num. 3, p. 422-431, 2012.
[6] M. Frankowiak, R. Grosvenor, and P. Prickett, "A review
of the evolution of microcontroller-based machine and
process monitoring", International Journal of Machine Tools
and Manufacture, vol. 45, pp. 573-582, 2005

BIOGRAPHIES :
Patel Kalpana Arjun
Head Of Department
Electrical Engineering
D. N. Patel College of Engineering
Shahada, Maharashtra, India
Mob. 8149634025
E-mail: patel.kalpana1565@gmail.com
Bagul Nikhil Kishor
Dept. of Electrical Engineering
Mob. 9545660961
E-mail: bagulnikhil143@gmail.com
Badodekar Rohit Digambar
Mob. 7350305835
E-mail: rohitbadodekar76@gmail.com
Patil Manish Sudhakar
Mob. 7507199751
E-mail: manishsudhakarpatil@gmail.com
Nikumbh Vinod Raju
Mob. 9922149048
E-mail: vinodnikumbh36@gmail.com

IRJET- IoT based Feeder Protection from Overload and Earth Fault

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IRJET- IoT based Feeder Protection from Overload and Earth Fault