Star delta starter of induction motor

This provides one third of DOL current to the motor, thus reducing the high inrush current inherent with large capacity motors at startup. At the time of starting an Induction motor tends to draw high-current (7totimes higher than rated current ). But for larger motor the starting current may be so high that it may damage the stator coil or even. The main purpose of any starter is to reduce the requirement of high starting current. To limit the starting current surge , large induction motors are started at reduced voltage and then have .

Open or close star delta starter with contactors, timers,switches for motor starting , where in motor windings connected in star,then in delta starter , types.

In starting as slip s= the induced EMF in rotor circuit would be sE2=E hence heavy current flows in short circuit rotor circuit, reflect to draw heavy primary current from stator circuit, or from the mains, and hence may blow out fuses.

Starters are used to reduce inrush current by applying less voltage in starting. To start the induction motor by applying Star - Delta starter. The objective of this starting metho which is used with three- phase induction motors , is to reduce the starting current.

In starting position, current supply to the stator windings is connected in star (Y) for starting. In the running position, current supply is reconnected to the windings in delta . Star delta starter is used to reduce the starting current drawn by the motor. The Star - Delta (Y-Δ) 3-phase Motor Starting Method by Automatic star - delta starter with Timer Star Delta 3-phase Motor Automatic starter with Timer.

We may not use star delta starter if the required (application or load) torque is more than of the three phase induction motors rated torque. What are the advantages of star - delta starter with induction motor ? The main advantage of using the star delta starter is reduction of current during the sta. Star Delta Conversions :Simple DC Circuits -Clear Audio - Duration: 12:25. Reduced voltage method for starting squirrel cage induction motor. Now let us discuss each of these methods in detail.

At starting the Induction motor is star connected after it reached the approximate operational speed it is switch to delta. The motor must be delta connected during a . The star scheme utilised more current but. The Star - Delta is used in Induction Motors (Squirrel Cage) motors to deal with the high starting current of the motor. This high Starting current is due to low .