International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Three Phase Induction Motor Protection Scheme Yogesh Mandekar 1,Swapnil Bongale2, Vinayak Savant3, Himen Savsani4,Suraj Salunkhe 5 Mr.Prof. Suraj Pawar6 UG Student,Dept Of Electrical Engineering, Sanjay Ghodawat Institutes(SGI), Atigre,Maharashtra,India Professor, Dept Of Electrical Engineering, Sanjay Ghodawat Institutes(SGI), Atigre,Maharashtra,India ---------------------------------------------------------------------***--------------------------------------------------------------------percentage balanced under voltage increases the speed Abstract - This paper include a protection scheme for decreases drastically with increase in load. When the three phase induction motors against single-phasing faults. A simulation was proposed, which can help to percentage balanced under voltage exceeds 30%, then determine the impact of single-phasing on any three the induction motor performance is very poor and phase induction motor. Using MATLAB/SIMULINK hence to be avoided. Operating the motor from 10% to software a case study of single-phasing is carried out. A 30% of balanced under voltage can be permitted with single-phasing protection by means of contactors was the compromise of reduced performance. During reviewed before an enhanced single-phasing protection balanced over voltage condition, the increase in speed was designed.. The latter, in additional to protection is not proportional to increase in voltage. But increase against single-phasing, also protects the motor from in current is proportional to voltage. Hence Losses in under-voltage, over-voltage and voltage unbalance. the motor is more i.e., increase in power delivered by In the hardware circuit is completely controlled by the the motor is less as compared to increase in power microcontroller and monitors the voltages of three drawn by the motor. Hence efficiency is reduced. 1,2,3,4,5
6 Assistant
phase.If voltage goes beyond the limit then it turn off the motor by switching. With the help of current transformer which senses the current and if it exceeds level then comparator sends signal to microcontroller to stop the motor. All the conditions are shown by it over the LCD display. In this paper we are utilizing the 8 bit microcontroller ATmega328p.It is a 28 pin microcontroller. Metering unit ADE7758 is used in this project. It protects the motor from single phasing, over voltage, dry run, over current. Key words: Single phasing,Over voltage,over current protection.
1.INTRODUCTION Induction motor is one of the most important motors used in industrial applications. The operating condition may sometime lead the machine into different fault situations. The main types of external faults experienced by these motors are overloading, single phasing, unbalanced supply voltage, locked rotor, phase reversal, ground fault, under voltage and over voltage. 1. Under and over voltage supply conditions:
2. Heat dissipation/over temperature Since the current drawn by the motor is more, heat dissipation in the stator and rotor is increased drastically when the percentage balanced over voltage exceeds 25%. Hence it is recommended to operate the motor within 10% of balance over voltage. 3. Single phasing: Single phasing condition affects the motor performance .The currents are enormously high so that the conductors cannot with stand the heavy current and hence losses are also more. The heat dissipation is heavy which will damage the stator and rotor conductors. Also there is heavy pulsation in torque and speed. Therefore, in the developed protection scheme top priority is given for protection of motor during single phasing condition.
Under voltage and over voltage supply conditions are commonly occurring power line problems. Efficiency of induction motor decreases when voltage on the induction motor decreases even though all the three phases is balanced. When the Š 2017, IRJET
|
Impact Factor value: 5.181
|
ISO 9001:2008 Certified Journal
|
Page 747