This document describes a PLC-based protection system for three-phase induction motors. The system monitors operational parameters like currents, voltages, temperature to detect faults like under voltage, over voltage, single phasing or overloading. It uses sensors, analog and digital I/O to interface with the motor. A PLC is used for motor control and protection. The system provides accurate monitoring, protection and cost-effective maintenance for induction motors used in industries like textiles, pumps and elevators.

1. Presented By:-
Dev Krishan Kumar
0206EE171011

2. ABSTRACT
 In most modern industries there is a growing need for high
efficiency and availability in motor driver systems.
 Moreover, motor operation monitoring is necessary for the
 implementation of proper and cost effective motor
 maintenance.
 In this research, a PLC-based protection method for three
 phase induction motors is used .
 The PLC automated process costs less, provides higher
accuracy.
 The PLC correlates and controls the operational
parameters to the set point requested by the user and
monitor the motor.

3. Introduction
 Main aim of this research based project is to
design a motor driver system with the help of PLC
to control induction motor and protect induction
motor from possible faults .
 All operational data is provided by a device that is
able to read line currents, line-to-line voltages,
unbalanced current, unbalance voltage and
temperature.
 This systems are equipped with special I/O units
appropriate for direct usage in
industrial automation systems

4. EXTING SYSTEM
 Fault Detection and Protection of Induction
motor using PIC Controller in Sept 2006 .
 The application of wireless sensor networks for
condition monitoring in three-phase induction
motors in 2007.
 A Connectivity Improving Mechanism for ZigBee
Wireless Sensor Networks.

5. Faults
 Under voltage
 Over voltage
 Single phasing
 Earthling faults
 Overloaded

6. PROTECTION SYSTEM HARDWAER
 PROGRAMMABLE LOGIC CONTROLLER
 POWER SUPPLY
 RMS TO DC CONVERSION AD536 A
 RS-232 CABLE
 CURRENT/VOLTAGE TRANSFORMERS
 COMPUTER SYSTEM

7. Application of PLC
 Motor drive
 Pump
 Light
 Push button
 Photo sensor

8. PLC components
 Sensors - converts a physical condition into an
electrical signal.
 Discrete Input/output- referred to as a digital
input/output, is an input/output that is either in an
ON or OFF condition.
 Analog Input/output:-An analog input/output is a
continuous, variable signal.

9. POWER SUPPLY
 A Constant Power Supply of 5V is required in the proposed system using
rectifiers , filters and voltage regulator.
 AD536A is a complete monolithic integrated circuit that performs true
rms to dc conversion.
 it is a serial communication physical interface through which information
transfers in or out one bit at a time. it provides the connection between PLC
and computer system.
 A current transformer is a type of "instrument transformer" that is
 designed to provide a current in its secondary which is accurately
 proportional to the current flowing in its primary.
 Voltage transformers (VT) or potential transformers (PT) are another
 type of instrument transformer, used for metering and protection
 in high-voltage circuits.

10. SOFTWARE INTERFACTING

11. APPLICATION OF SYSTEM
 Textile Industries
 Industrial Pumps & Fans
 Elevators
 Cement mills
 Rubber mills
 Cranes

12. CONCLUSION
 In this study, a novel digital protection system for
three phase Induction motor designed and
implemented successfully.
 If any fault is observed during online operation
of the motor, a warning message appears on
computer and then the motor is stopped.
 it provides a visual environment, which makes
the system more user friendly than other
protection system.