star triangle starting diagram 1 direction of travel
1st stage:_ The windings are star-coupled, the voltage is reduced across each winding.
2nd step: Removal of the star coupling then (after time delay) the motor windings are coupled in a triangle, each winding is now subjected to the network voltage.
An asynchronous motor has a high torque and can absorb 4 to 8 times its nominal current on start-up, which risks causing disturbances on the electrical network, voltage drop, tripping of protection.
To reduce this current draw, a simple and financially attractive process is used, star/delta starting, because 3 power contactors and a simple remote control are enough to operate.
This process can only be applied to motors whose delta coupling corresponds to the network voltage U,
Functioning:
1st stage: The windings are star-coupled, the voltage is reduced across each winding.
2nd step: Removal of the star coupling then (after time delay) the motor windings are coupled in a triangle, each winding is now subjected to the network voltage.
star triangle starting diagram 1 direction of travel
1st stage:_ The windings are star-coupled, the voltage is reduced across each winding.
2nd step: Removal of the star coupling then (after time delay) the motor windings are coupled in a triangle, each winding is now subjected to the network voltage.
An asynchronous motor has a high torque and can absorb 4 to 8 times its nominal current on start-up, which risks causing disturbances on the electrical network, voltage drop, tripping of protection.
To reduce this current draw, a simple and financially attractive process is used, star/delta starting, because 3 power contactors and a simple remote control are enough to operate.
This process can only be applied to motors whose delta coupling corresponds to the network voltage U,
Functioning:
1st stage: The windings are star-coupled, the voltage is reduced across each winding.
2nd step: Removal of the star coupling then (after time delay) the motor windings are coupled in a triangle, each winding is now subjected to the network voltage.
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