The most basic feature of an Induction motor is its self starting mechanism. Due to the rotating magnetic field, an emf is induced in the rotor, because of which current starts flowing in the rotor.
Unit I: Introduction to Protection System:
Introduction to protection system and its elements, functions of protective relaying, protective zones, primary and backup protection, desirable qualities of protective relaying, basic terminology.
Relays:
Electromagnetic, attracted and induction type relays, thermal relay, gas actuated relay, design considerations of electromagnetic relay.
Unit-II: Relay Application and Characteristics:
Amplitude and phase comparators, over current relays, directional relays, distance relays, differential relay.
Static Relays: Comparison with electromagnetic relay, classification and their description, over current relays, directional relay, distance relays, differential relay.
Unit-III Protection of Transmission Line:
Over current protection, distance protection, pilot wire protection, carrier current protection, protection of bus, auto re-closing,
Unit-IV: Circuit Breaking:
Properties of arc, arc extinction theories, re-striking voltage transient, current chopping, resistance switching, capacitive current interruption, short line interruption, circuit breaker ratings.
Testing Of Circuit Breaker: Classification, testing station and equipments, testing procedure, direct and indirect testing.
Unit-V Apparatus Protection:
Protection of Transformer, generator and motor.
Circuit Breaker: Operating modes, selection of circuit breakers, constructional features and operation of Bulk Oil, Minimum Oil, Air Blast, SF6, Vacuum and d. c. circuit breakers.
PPT on earthing, grounding and isolation made by the students of SVIT,Vasad under the valuable guidance of the faculties teaching us Electronics and Electrical workshop(EEW) under the course of GTU.
Unit I: Introduction to Protection System:
Introduction to protection system and its elements, functions of protective relaying, protective zones, primary and backup protection, desirable qualities of protective relaying, basic terminology.
Relays:
Electromagnetic, attracted and induction type relays, thermal relay, gas actuated relay, design considerations of electromagnetic relay.
Unit-II: Relay Application and Characteristics:
Amplitude and phase comparators, over current relays, directional relays, distance relays, differential relay.
Static Relays: Comparison with electromagnetic relay, classification and their description, over current relays, directional relay, distance relays, differential relay.
Unit-III Protection of Transmission Line:
Over current protection, distance protection, pilot wire protection, carrier current protection, protection of bus, auto re-closing,
Unit-IV: Circuit Breaking:
Properties of arc, arc extinction theories, re-striking voltage transient, current chopping, resistance switching, capacitive current interruption, short line interruption, circuit breaker ratings.
Testing Of Circuit Breaker: Classification, testing station and equipments, testing procedure, direct and indirect testing.
Unit-V Apparatus Protection:
Protection of Transformer, generator and motor.
Circuit Breaker: Operating modes, selection of circuit breakers, constructional features and operation of Bulk Oil, Minimum Oil, Air Blast, SF6, Vacuum and d. c. circuit breakers.
PPT on earthing, grounding and isolation made by the students of SVIT,Vasad under the valuable guidance of the faculties teaching us Electronics and Electrical workshop(EEW) under the course of GTU.
CONTENT
Starting Of Induction Motor
Starters
Types Of Starter For 3-ph Induction Motors
Starting Of Slip Ring Induction Motor
D.O.L.(Direct On Line) starter
Star-delta Starter
Auto Transformer Starter
Difference Between DOL/Star Delta/ Autotransformer
Automatic Star Delta Starter Using Relays And Adjustable Electronic Timer For...Edgefxkits & Solutions
This PPT explains about how to provide low voltage start to induction motor. This is achieved by using star to delta conversions.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
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Visit our page to get more ideas on popular electronic projects developed by professionals.
Edgefx provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
CONTENT
Starting Of Induction Motor
Starters
Types Of Starter For 3-ph Induction Motors
Starting Of Slip Ring Induction Motor
D.O.L.(Direct On Line) starter
Star-delta Starter
Auto Transformer Starter
Difference Between DOL/Star Delta/ Autotransformer
Automatic Star Delta Starter Using Relays And Adjustable Electronic Timer For...Edgefxkits & Solutions
This PPT explains about how to provide low voltage start to induction motor. This is achieved by using star to delta conversions.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
http://www.edgefxkits.com/
Visit our page to get more ideas on popular electronic projects developed by professionals.
Edgefx provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
AC 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.
Motor StarterTypes and Technology of Motor Starter And Its Applicationselprocus
Most induction motors are started directly on line, but when very large motors are started that way, they cause a disturbance of voltage on the supply lines due to large starting current surges. To limit the starting current surge, large induction motors are started at reduced voltage and then have full supply voltage reconnected when they run up to near rotated speed.
star delta auto starter with forward reverse and motor protectionBHUPATI PRADHAN
It is a project on pure electrical engineering. Here three phase motor is starting from star to delta automatically by using some components.In other hand it also provide protection to the motor.
Energy Efficient Operation of Three Phase Induction Motor using Delstar Conve...IJECEIAES
DELSTAR converter is an electronic system to be interfaced with the existing STAR – DELTA starter for machine tools. Induction motor consumes more power while it is operated at DELTA mode for a long time under no load condition. The proposed system gives the solution for the above stated problem. When the load on the motor is less than 40% of full load, it switches the motor to operate in STAR mode to save energy. When the load increases beyond 40%, it automatically switches the motor to operate in DELTA mode. The starting regimen is not disturbed. The proposed converter is recommended for applications where load changes are not more than 120 times/hour. This can be used with any capacity motor by choosing appropriate current transformers and setting the current level using the potentiometer built in. The proposed converter is designed for 5HP induction motor and experimentally tested.
This ppt is for your education purpose.
I can explain the electrical starters in very best ways ,
you can understande the all electrical starters in very easy methods.
For your any inquiry,
CONTECT NO : - 9082557285
CREATED BY : - AYUSH .A. PITHAL
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Starters of induction motor and protection equipmentsateesh kumar
Safety precautions of Electrical power supply
Starting methods of Induction machine
Protection equipment of 3-phase machines
Various operations of machines on Induction machine used in industry
Minimization of Starting Torque and Inrush Current of Induction Motor by Diff...ijtsrd
Induction motors are considered nowadays the most commonly used electrical machines, which are mainly used as electrical induction motors and sometimes as generators. This is mainly due to the simplicity of composition, low price, light weight, high reliability, easy to command and control performance and not containing parts that could easily breakdown compared with DC machines and synchronous machines. Starting the IM is the most important and dangerous step, where the motor properties play a major role in the evaluation of all electrical motors, and these properties are defined by the following factors Starting torque. starting current. transient state. smoothness of the starting, simplicity and economics of starting. In this paper, three different methods of starting three phase Induction Motor are discussed and compared through curves of currents, torque, speed. These methods are Direct On Line, Auto Transformer, Star Delta, for a constant power load condition. Simulation is made in MATLAB SIMULINK and comparatively results are estimated to evaluate the best starting method for different range of induction motor rating. Suraj Grover | Mr. Mahesh Mankar ""Minimization of Starting Torque and Inrush Current of Induction Motor by Different Starting Methods using MATLAB/SIMULINK"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd22935.pdf
Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/22935/minimization-of-starting-torque-and-inrush-current-of-induction-motor-by-different-starting-methods-using-matlabsimulink/suraj-grover
How to Choose the Right Microcontrollers For Your Embedded Projectselprocus
The main features to consider while selecting microcontrollers for embedded applications are hardware’s, data transfer, power consumption, memory size, cost
Complex Programmable Logic Device (CPLD) Architecture and Its Applicationselprocus
A CPLD (complex programmable logic device) chip includes several circuit blocks on a single chip with inside wiring resources to attach the circuit blocks. Each circuit block is comparable to a PLA or a PAL.
Designing process of printed circuit boardselprocus
Most key element in electronic circuits and equipment’s is the Printed Circuit Board which connects electronic components with conductive lines printed
Construction of mica capacitor and its applicationelprocus
In this article we learn Mica capacitor working, construction and applications. Silver mica capacitors are high precision, stable and reliable capacitors
Difference between npn and pnp transistor.pptxelprocus
The difference between NPN and PNP transistor mainly include what is a transistor, what are PNP and NPN transistors, Construction and working of transistors
Hartley oscillator circuit theory working and applicationelprocus
This article discusses about an hartley oscillator circuit, circuit using operational amplifier, uses LC tank circuit, advantages, disadvantages and its applications
Mobile jammer is a device which interferes the cell phone signals. Learn the working of a cell phone jammer, different types of jammers and its applications
For more details: https://goo.gl/DU59CB
Different types of transistors and their functionselprocus
This article discusses about types of transistors and basic applications.Common types of transistor are BJT, FET, HBT, Darlington, Schottky, JFET, Diffusion
What are the methods of soldering electronic componentselprocus
Soldering is the process of fixing pieces of metal together.This tutorial cover the different methods of soldering, soldering tips required for electronic components
Basics of bypass capacitor, its functions and applicationselprocus
Bypass Capacitor is a capacitor that shorts AC signals to the ground. This article explains the types of bypass capacitors, functions, and its applications
IC 4017 is a 16 Pin Decade counter, used to produce decoded decimal count as output. Find a couple of applications like circling LEDs and running light.
Overview of Crystal Oscillator Circuit Working and Its Applicationelprocus
A crystal oscillator is an electronic oscillator circuit which is used for the mechanical resonance of a vibrating crystal of piezoelectric material. It will create an electrical signal with a given frequency. This frequency is commonly used to keep track of time.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Introduction Of Induction Motor?
The most basic feature of an Induction motor is its self starting mechanism.
Due to the rotating magnetic field, an emf is induced in the rotor, because of
which current starts flowing in the rotor. As per the Lenz law, the rotor will
start rotating in a direction so as to oppose the flow of electric current and this
gives a torque to the motor. Thus the motor gets self started.
3. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Connection Of A 3 Phase Induction Motor Consists Of?
A 3 Phase Induction motor consists of a stator.
It contains 3 phase winding connected to the 3 phase AC supply.
The arrangement of the winding is to produce a rotating magnetic field.
The rotor of the Induction motor contains cylindrical core with parallel slots
that contain conductors.
4. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
What Problems Can Encounter During Motor Starting?
During the motor self starting period, torque increases and a large amount of
current flows in the rotor.
To achieve this the stator draws a large amount of current and by the time the
motor reaches its full speed
A large amount of current is drawn and coils get heated up, damaging the
motor.
Hence there is a need to control the motor starting.
One way is to reduce the applied voltage, which in turn reduces the torque.
6. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
The Objectives of Star-Delta Technique Motor Starter are
Reduce high starting current and along these lines forestall motor from overheating.
Provide over-burden and no-voltage assurance.
7. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Star Delta Starter:
In star delta starting, the motor is connected in STAR mode throughout the
starting period. When the motor reached the required speed, the motor is
connected in DELTA mode.
8. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Main Components of a Star-Delta Starter
Contactors : The Star- Delta starter circuit comprises of three contactors: Main,
star and delta contactors.
Timer: The contactors are regulated by a timer incorporated with the started.
Interlock Switches: Interlock switches are connected between star and delta
contactors of the control circuit as a safety measure so one can’t activate delta
contactor without deactivating star contactor.
Thermal Overload Relay: A thermal over-load relay is likewise consolidated
into star-delta control circuit to ensure the motor from intemperate heat which
might expedite motor finding fire or wearing out.
9. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Working of Star-Delta Starter
At first the primary contactor and the star contactors are shut.
After a time interval the timer signs to the star contactor to head off to the
open position.
The primary, delta contactors to head off to the shut position, accordingly
structuring delta circuit.
At the time of starting, every stator stage gets voltage VL/v3, where VL is
the line voltage.
The line current drawn by the motor at starting is decreased to one-third as
contrasted with starting current with the windings associated in delta.
10. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Since the torque advanced by an induction motor is corresponding to the square of the
applied voltage.
Star- delta starter decreases the starting torque to one- third of that possible by immediate
delta starting.
The timer controls conversion from star connection to delta connection.
A timer in star delta starter for a 3-phase motor is intended to do the move from star mode.
Utilizing which the motor runs on a decreased voltage and current and produces less torque.
To the delta mode indispensible for running the motor at its full power.
Utilizing high voltage and current to transform a high torque.
11. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Terminal Connections in Star and Delta Configurations
Star Configuration:
L1, L2 and L3 are the 3-phase line voltages, which are given to primary
contactor
The main motor coils are U, V and W.
In star mode of motor windings, the primary contactor associate the mains to
essential winding terminals U1, V1 and W1.
The star contactor shorts the auxiliary winding terminals U2, V2 and W2
12. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Notwithstanding when the primary contactor is shut, supply arrives at terminals
A1, B1, C1.
Consequently the motor windings are energized in star-mode.
The timer is initiated in the meantime moment when star contactor is energized.
After the timer achieves the specified time period.
The star contactor is de-energized and delta contactor is energized.
Star Configuration:
13. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
The point when delta contactor closes.
The motor winding terminals U2, V2 and W2 get associated with V1, W1 and
U1 individually through the shut contacts of primary contactor.
For delta association, fulfilling end of one winding is to be joined with
beginning end of the other winding.
The motor windings are reconfigured in delta by supplying line voltage L1 to
winding terminals W2 and U1, line voltage L2 to winding terminals U2 and
V1.
The line voltage L3 to winding terminals V2 and W1.
16. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Star Delta Open Transition Starter
It is the most widely recognized strategy for star-delta starting.
In this strategy motor windings are open throughout the transition time of
altering the windings from a star mode with a delta mode.
The star-delta open move starter uses 3 motor contactors and a move delay relay.
17. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Merits:
Open transition starter is very easy to implement in terms of cost and circuitry.
It does not require additional voltage educing equipment.
Star Delta Open Transition Starter
18. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Demerits:
Open transition makes a surge of current and torque at change over
Which stuns the system both electrically and mechanically.
Electrically, the outcome of the momentary peaks in current could cause force
vacillations or misfortunes.
Mechanically, the expanded torque coming about because of the current spike
could be sufficient to harm system components i.e. snap a drive shaft.
Star Delta Open Transition Starter
19. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Star Delta Closed Transition Starter:
The transfer from the star to delta modes is made without disengaging motor
from the line.
A couple of components are added to dispose of or decrease the surge
connected with the open transition.
The extra components incorporate a contactor and few transition resistors.
The transition resistors consume the present stream throughout the winding
changeover.
20. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Star Delta Closed Transition Starter:
A fourth contactor is additionally used to place the resistor in circuit
before opening the star contactor.
Afterward evacuating the resistors once the delta contactor is closed.
The control circuit is more confounded because of the need to complete
resistor exchanging.
21. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Merit:
Star Delta Closed Transition Starter:
There is a reduction in the incremental current surge, which results from transition.
Thus closed transition starter has a smooth change over.
22. http://www.elprocus.com/
Industrial Star Delta Starter for a 3-Phase
Induction Motor
Star Delta Closed Transition Starter:
Demerit:
In addition to requiring more switching devices.
The control circuit is more complicated due to the need to carry out resistor
switching.
The added circuitry leads to significant rise in the cost of the installation.