Dol motor starter
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DOL Motor Starter is the least complex, least expensive and most basic Starting technique.Besides, it really gives the least temperature ascend inside the engine amid start-up of all the beginning techniques.
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The document discusses direct on-line (DOL) starters for three-phase induction motors. It describes how a DOL starter works by directly connecting the motor to the power supply using a contactor, and lists some key components like fuses, isolators, contactors, and overload relays. It notes that DOL starters are simple and inexpensive but produce high starting currents. The document outlines the operation of a basic DOL starter and concludes by reviewing some features like high starting torque but also high current peaks and voltage dips.
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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
Single phase i.m.
WORKING PRINCIPLE
CONSTRUCTION
DOUBLE REVOLVING FIELD THEORY
TYPES OF SINGLE PHASE INDUCTION MOTOR
EQUIVALENT CIRCUIT OF IT
armature Winding
Winding
What is Armature winding?
Terms related to armature winding.
Single layer and double layer windings.
Comparison between closed and open windings.
Types of DC armature winding.
Types of AC armature winding.
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i am student of electrical engineering at QUEST nawabshah
please give tour feedback
email: 15el32@quest.edu/pk
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Losses dc machines
1) There are several types of losses that reduce the efficiency of DC machines, including electrical or copper losses, core losses, brush losses, mechanical losses, and stray load losses.
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CONTENT
Starting Of Induction Motor
Starters
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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
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CONSTRUCTION
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TYPES OF SINGLE PHASE INDUCTION MOTOR
EQUIVALENT CIRCUIT OF IT
armature Winding
Winding
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Terms related to armature winding.
Single layer and double layer windings.
Comparison between closed and open windings.
Types of DC armature winding.
Types of AC armature winding.
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This document discusses different types of single-phase induction motors and how they are made self-starting. It describes the construction and working of a basic single-phase induction motor. Such a motor is not self-starting because it produces an alternating flux that cannot cause rotation on its own. The document then explains various methods used to make single-phase motors self-starting, including split-phase, capacitor-start, and shaded-pole designs. It provides details on how split-phase and capacitor-start motors introduce a phase difference between windings using a starting winding and capacitor, producing a revolving magnetic field that can start the motor.
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This document discusses motor protection principles and thermal modeling for motor protection relays. Some key points:
- Motors account for a large portion of electricity usage and failures can be costly. Thermal stress is a major cause of failures.
- A motor protection relay uses a thermal model to monitor the thermal capacity used based on operating conditions like load, ambient temperature, voltage, and current balance. It can trip for overload based on reaching 100% thermal capacity.
- The thermal model considers motor states like running, starting, and overloaded. It uses thermal limit curves, an overload curve, cooling time constants, and a hot to cold stall time ratio in its calculations. Current unbalance is also accounted for through a bias factor.
Repulsion motor
i am student of electrical engineering at QUEST nawabshah
please give tour feedback
email: 15el32@quest.edu/pk
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This document provides an overview of motor protection and thermal modeling concepts. It discusses how motor protection relays use thermal modeling to prevent motor failure due to overheating. The thermal model represents the motor's ability to dissipate heat and monitors the motor's thermal capacity used. It aims to limit thermal stress and protect all motor components by allowing only safe operating currents and times based on the motor's thermal limits. Settings involve determining key parameters like overload pickup, stall time ratios, cooling times and start inhibit functions.
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Many people read about Direct and Indirect Test. It is nothing but a no load and blocked rotor test. It is easy to know what happens in these test by there names.
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This document discusses different types of motor starters used for induction motors. It describes stator resistance, auto transformer, star-delta, rotor resistance, direct online (DOL), and variable frequency drive (VFD) starters. Each type is explained in terms of its operating principle. Their advantages and disadvantages are also summarized. The document aims to educate about motor starters and the techniques used to safely start induction motors.
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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.
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This presentation summarizes the operation of a star-delta starter circuit used to protect motors. It begins with an introduction of the presenters and topic. Then, it explains that a star-delta starter uses three contactors, a timer, and overload protection to initially connect the motor in a star configuration, providing lower starting current and torque. After a set time, it switches to a delta configuration to provide full voltage and torque. Key advantages are simple operation, lower cost than other starting methods, and good torque-current performance, while disadvantages include low starting torque and needing a six-terminal motor.
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Project PPT
This document describes the design of an automatic star-delta starter for an induction motor using relays and an adjustable electronic timer. The starter is designed to reduce starting current and prevent issues from low voltage, single phasing, over voltage and under voltage. The circuit uses a 555 timer, transistors, diodes, resistors, capacitors, relays and transformers. It operates by starting the motor in a low-current star configuration, then switching to a delta configuration after a set time using relays controlled by the 555 timer. This provides smooth starting of the induction motor.
Motor StarterTypes and Technology of Motor Starter And Its Applications
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.
Motor starter Design
Motor Starter design for switchgears.
It contains Methods of induction motor starting include :
Direct on-line starting
Star-delta starting
Resistance stator starting
Autotransformer starting
Slip ring motor starting
Soft starter starting/slackening
Frequency converter starting
Device selection and proposed circuit for different motor powers and some definition about Load List and other technical consideration of design.
Losses dc machines
1) There are several types of losses that reduce the efficiency of DC machines, including electrical or copper losses, core losses, brush losses, mechanical losses, and stray load losses.
2) Electrical losses include losses from the armature winding resistance, shunt field winding resistance, series field winding resistance, and interpole winding resistance.
3) Core losses are hysteresis and eddy current losses and account for around 20% of full load losses.
4) Brush losses are due to the voltage drop and current at the brush contact with the commutator.
Alternator
An alternator is an electrical generator that converts mechanical energy to electrical energy. It uses a rotating magnetic field with a stationary armature. The working principle relies on Faraday's law of electromagnetic induction. As the armature rotates within the magnetic field, an alternating current is produced. The main components are the stator with stationary armature windings and the rotor with a rotating magnetic field supplied by a DC current. Armature reaction causes the magnetic field to be distorted by the armature current. Alternators have various applications including in automobiles, power plants, and for providing regenerative braking in induction motors. Induction generators can also be used to convert the rotational energy of windmills into electrical energy.
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- Three-phase induction motors require control gear like starters to control and protect the motor.
- A basic direct-on-line (DOL) starter connects the motor directly to power. It consists of contactors, overload protection, and start/stop buttons.
- A reversing DOL starter uses two contactors to reverse the motor by swapping phases.
- Induction motors draw high starting current. A star-delta starter reduces this by starting in a lower current star configuration before switching to delta.
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- A reversing DOL starter uses additional contactors to reverse the motor direction by swapping the phase connections.
- Induction motors draw high starting currents that can cause problems. A star-delta starter reduces this by initially connecting the motor in star, then switching to delta after it speeds up.
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- Three-phase induction motors require control gear like starters to control and protect the motor.
- A basic direct-on-line (DOL) starter connects the motor directly to the power supply using contactors. It includes fuses, an isolator, contactor, and overload protection.
- More advanced starters like a reversing DOL starter use additional contactors to reverse the motor direction, while a star-delta starter reduces starting current by initially connecting the motor in star before switching to delta.
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- A Direct On Line (DOL) starter connects the motor directly to the power supply. It consists of fuses, an isolator, contactor, and overload protection. Pressing the start button energizes the contactor coil to close the contacts and start the motor.
- A reversing DOL starter uses two contactors to reverse the motor direction by swapping the phase connections. It has separate start buttons for forward and reverse operation.
- A star-delta starter reduces starting current by initially connecting the motor in star configuration before switching to delta. This allows the motor to start smoothly before applying full voltage.
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- A Direct On Line (DOL) starter connects the motor directly to the power supply. It consists of fuses, an isolator, contactor, and overload protection. Pressing the start button energizes the contactor coil to close the contacts and start the motor.
- A reversing DOL starter uses two contactors to reverse the motor direction by swapping the phase connections. It has separate start buttons for forward and reverse operation.
- A star-delta starter reduces starting current by initially connecting the motor in star configuration before switching to delta. This allows the motor to start smoothly before applying full voltage once up to speed.
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1. Three phase induction motors are widely used in industry due to their simple and robust construction. They convert electrical energy to mechanical energy using a stationary stator and a rotating rotor.
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Dol motor starter
- 2. Why Starter • A starter is required for a three stage Induction Motor, why because if you start the motor directly at the time of starting, motor will consume more current that cause a adjoining equipment's to damage. To avoid a starter is required with a specific end goal to constrain the beginning current. • This will increase the voltage losses in the winding which will overheat the Motor. • The overwhelming starting current may harm the Motor winding.
- 3. Types of Motor Starter • DOL (Direct On Line) Motor Starter • Star Delta Starter • Auto transformer starter • Motor Soft starter • Three Point starter • four point starter
- 5. • Direct Online Starter as the name implies the starter connects the motor directly across the line is called DOL Motor Starter. • In this Method a Motor is connected by means of starter across full supply voltage. • Used up to 5HP. • Doesn't increase the starting current. • Its connect directly the motor with supply for starting as well as for running.
- 6. About Us • Magnumswitchgear is a No. 1 leading DOL Motor Starter manufacturers in Bangalore. • Contact us http://www.magnumswitchgear.com/dol-motor- starter-mach-series/ +91-8618241212, +91-80-23580952
- 7. THANK YOU