Auto transformer starter power circuit | auto transformer starter connection | Electrical Technician
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auto transformer starter for 3-phase
auto transformer starter for 3-phase induction motor
An Auto transformer Starter is suitable for both star and delta connected motors. In this method, the starting current is limited by using a three-phase auto transformer to reduce the initial stator applied voltage. The figure below shows the motor with the Auto transformer starter.
It is provided with a number of tappings. The starter is connected to one particular tapping to obtain the most suitable starting voltage.
The starting current 6 to 8 times the rated current and this can cause voltage dip in supply and also motor and motor-driven equipment experience large torque surge which can damage the motor as well as connected equipment. Three phase autotransformer is used to reduced high inrush starting current.
Theory of Auto transformer Starter
Auto-transformer starter (Variable Autotransformer) can be used with any squirrel cage induction motor, motor supplied through taps of three-phase auto transformer starter.In Auto-transformer Starter, Motor is directly connected on secondary of autotransformer.
The taps provided on auto-transformer limit the starting voltage and supply motor in steps of 50% 65% or 80% of nominal voltage. Using auto transformer for starting purpose the line current is always less than motor nominal current during start, because of motor connected to the secondary side of auto-transformer starter during acceleration.
if the motor connected to 50% tap of auto transformer, the motor current would be reduced up to 50% of nominal starting current. But the line current will be only 25% of nominal starting current. The difference between line current and motor current due to auto transformer is in the circuit.
Due to the lower line, current auto transformer starter is a very popular type of reduce voltage starter. Since the motor starting current is greater than the line current with autotransformer starter, the starter produced more torque per ampere of line current than any other type of reduce voltage starter
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An Auto transformer Starter is suitable for both star and delta connected motors. In this method, the starting current is limited by using a three-phase auto transformer to reduce the initial stator applied voltage. The figure below shows the motor with the Auto transformer starter.
It is provided with a number of tappings. The starter is connected to one particular tapping to obtain the most suitable starting voltage.
The starting current 6 to 8 times the rated current and this can cause voltage dip in supply and also motor and motor-driven equipment experience large torque surge which can damage the motor as well as connected equipment. Three phase autotransformer is used to reduced high inrush starting current.
Theory of Auto transformer Starter
Auto-transformer starter (Variable Autotransformer) can be used with any squirrel cage induction motor, motor supplied through taps of three-phase auto transformer starter.In Auto-transformer Starter, Motor is directly connected on secondary of autotransformer.
The taps provided on auto-transformer limit the starting voltage and supply motor in steps of 50% 65% or 80% of nominal voltage. Using auto transformer for starting purpose the line current is always less than motor nominal current during start, because of motor connected to the secondary side of auto-transformer starter during acceleration.
if the motor connected to 50% tap of auto transformer, the motor current would be reduced up to 50% of nominal starting current. But the line current will be only 25% of nominal starting current. The difference between line current and motor current due to auto transformer is in the circuit.
Due to the lower line, current auto transformer starter is a very popular type of reduce voltage starter. Since the motor starting current is greater than the line current with autotransformer starter, the starter produced more torque per ampere of line current than any other type of reduce voltage starter
Join this channel to support me and to download all the Pdf file of my Video 👇👇👇
@electricaltechnician
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4 سال پیش
در تاریخ 1399/10/18 منتشر شده
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