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DESCRIPTIONAC Induction motor (IM) are used as actuators in many industrial processes. Although IMs are reliable, they are subjected to some undesirable stresses, causing faults resulting in failure. Monitoring of an IM is a fast emerging technology for the detection of initial faults. It avoids unexpected failure of an industrial process. Monitoring techniques can be classified as the conventional and the digital techniques. 1.1 PROTECTION SCHEME OF INDUCTION MOTOR Classical monitoring techniques for three-phase IMs are generally provided by some combination of mechanical and electrical monitoring equipment. Mechanical forms of motor sensing are also limited in ability to detect electrical faults, such as stator insulation failures. In addition, the mechanical parts of the equipment can cause problems in the course of operation and can reduce the life and efficiency of a system. It is well known that IM monitoring has been studied by many researchers and reviewed in a number of works. Reviews about various stator faults and their causes, and detection techniques, latest trends, and diagnosis methods supported by the artificial intelligence, the microprocessor, the computer and other techniques in monitoring unbalanced voltage inter turn faults, stator winding temperature and microcontroller based digital protectors have been recently studied subjects. In these, while one or two variables were considered together to protect the IMs, the variables of the motor were not considered altogether. Measurements of the voltages, currents, temperatures, and speed were achieved and transferred to the computer for final protection decision. A programmable integrated circuit (PIC) based protection system has been introduced using Microprocessors and the solutions of various faults of the phase currents, the phase voltages, the speed, and the winding temperatures of an IM occurring in operation have been achieved with the help of the microcontroller, but these electrical parameters have not been displayed on a screen. Nowadays, the most widely used area of programmable logic controller (PLC) is the control circuits of industrial automation systems. The PLC systems are equipped with special I/O units appropriate for direct usage in industrial automation systems. The input components, such as the pressure, the level, and the temperature sensors, can be directly connected to the input. The driver components of the control circuit such as contactors and solenoid valves can directly be connected to the output.
- 1. A SEMINAR PRESENTATION ONPROTECTION OF INDUCTION MOTOR USING PLCELECTRICAL ENGINEERING GOVERNMENT ENGINEERING COLLEGE ,AJMERSeminar CoordinatorGuided By :- Presented By:-Mr. K.G SharmaDr. Lata Gidwani ABHISHEK MATHURAssociate professor Assistant professor VIII th semesterElectrical Branch
2. ABSTRACTIn most modern industries there is a growing need for highefficiency and availability in motor driver systems. Moreover, motor operation monitoring is necessary for theimplementation of proper and cost effective motormaintenance. In this research, a PLC-based protection method for three-phase induction motors is used . The PLC automated process costs less, provides higheraccuracy. The PLC correlates and controls the operationalparameters to the set point requested by the user andmonitor the motor. 3. INDUCTION MOTOR PROTECTION 4. INTRODUCTIONo Main aim of this research based project is todesign a motor driver system with the helpof PLC to control induction motor andprotect induction motor from possible faults .o All operational data is provided by a devicethat is able to read line currents, line-to-linevoltages, unbalanced current, unbalancevoltage and temperature.o This systems are equipped with special I/Ounits appropriate for direct usage inindustrial automation systems 5. EXISTING SYSTEM Fault Detection and Protection of Induction motorusing PIC Controller in Sept 2006 . The application of wireless sensor networks forcondition monitoring in three-phase inductionmotors in 2007. A Connectivity Improving Mechanism for ZigBeeWireless Sensor Networks. 6. FAULTS EARTH FAULTSUNDER VOLTAGEOVER VOLTAGE OVERLOAD SINGLE PHASEPHASING REVERSAL 7. PROTECTION SYSTEM HARDWARES PROGRAMMABLE LOGIC CONTROLLER POWER SUPPLY RMS TO DC CONVERSION AD536 A RS-232 CABLE CURRENT/VOLTAGE TRANSFORMERS COMPUTER SYSTEM 8. A PLC is a small computer usedfor automation of real worldprocesses, such as control ofmachinery on factory assemblylines. It was originally developed toreplace mechanical relay,timers, counters. Its purpose to monitor crucialparameters & adjust processoperation accordingly. 9. APPLICATIONS OF PLC 10. Sensors - converts a physicalcondition into an electricalsignal. Discrete Input/output- referred toas a digital input/output, is aninput/output that is either in anON or OFF condition. Analog Input/output:-An analoginput/output is a continuous,variable signal. CPU :- is a microprocessor systemthat contains the system memory& decision making unit. 11. PLC PROGRAMMINGLadder diagramThe ladder diagram is the mostpopular programming languageStatement list Function block 12. POWER SUPPLY A Constant PowerSupply of 5V isrequired in theproposed system usingrectifiers , filters andvoltage regulator. 13. AD536A is a complete monolithic integratedcircuit that performs true rms to dc conversion 14. RS-232 CABLE it is a serial communication physical interfacethrough which information transfers in or outone bit at a time. it provides the connectionbetween PLC andcomputer system. 15. A current transformer is a type of "instrument transformer" that isdesigned to provide a current in its secondary which is accuratelyproportional to the current flowing in its primary.Voltage transformers (VT) or potential transformers (PT) are anothertype of instrument transformer, used for metering and protectionin high-voltage circuits. 16. SOFTWARE INTERFACING 17. SCADA MONITORINGSCADA stands for SUPERVISORY CONTROLAND DATA ACQUISITIONits systems are used to monitor and control aplant or equipment in industries graphicallyalong with the control hardware . 18. APPLICATION OF SYSTEMTextile IndustriesIndustrial Pumps & FansElevatorsCement millsRubber millsCranes 19. This paper presents a part of an ongoing work. In all growing industries ,there is need of motordriver systems to control and monitor ofinduction motor from one central point usingPLC . This motor driver system will identified the faultand protect the motor within a second 20. CONCLUSION In this study, a novel digital protection system forthree phase Induction motor designed andimplemented successfully. If any fault is observed during online operation of themotor, a warning message appears on computer andthen the motor is stopped. it provides a visual environment, which makes thesystem more user friendly than other protectionsystem. 21. M. Peltola, Slip of ac induction motors and how to minimize it ABB Drives PressReleases Technical Paper, ABB, New Berlin, 2003, pp. 17. I. Colak, H.Celik, I.Sefa On line protection system for induction motors EnergyConvers. Manage.vol. 46, no. 17, pp. 27732786, 2005. A. Siddique, G.S.Yadava, and B.Singh, A review of stator fault monitoringtechniques of induction motors IEEE Trans. Energy Convers.vol. 20, no. 1, pp.106114, Mar. 2005. Y. Zhongming and W. Bin, A review on induction motor online fault diagnosis in3rd Int. Power Electron. Motion Control Conf.(PIEMC 2000),vol. 3, pp. 13531358. M. E. H. Benbouzid, Bibliography on induction motors faults detection anddiagnosis IEEE Trans. Energy Convers.vol. 14, no. 4, pp. 10651074, Dec. 1999. M.G. Ioannides, Design and implementation of PLC-based monitoring controlsystem for induction motor, IEEE Trans. Energy Convers.vol. 19, no. 3, pp. 469476,Sep. 2004. 22. QUERIES ????