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The startup mode of star delta is simple in structure, cheap in price and high in reliability. Therefore, it is widely used to reduce the equipment startup current by reducing the power. The starting mode of autotransformer is to use autotransformer to reduce the starting voltage applied to the stator winding of the motor. After the motor is started, the motor is separated from the autotransformer to move normally under full voltage. Soft start is to realize the smooth start of motor and mechanical load by adopting technical means such as voltage reduction, compensation or frequency conversion, so as to reduce the impact of starting current on the power grid and protect the power grid and mechanical system.
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