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The Star/Delta starter is manufactured from three contactors, a timer and a thermal overload. The contactors are smaller than the single contactor used in a Direct on Line starter as they are controlling winding currents only. The currents through the winding are 1/root 3 (58%) of the current in the line.

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Delta-Star Connection of Transformer. In this type of connection, the primary connected in delta fashion while the secondary current is connected in star. The main use of this connection is to step up the voltage i.e. at the begining of high tension transmission system. It can be noted that there is a phase shift of 30° between primary line.

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Star delta starter means we connect the stator with a star connected three phase supply until it reaches its specific percentage of maximum speed, then we switch the connection of the stator from the star circuit to delta circuit. A star delta starter is to energize the stator with a star circuit three phase supply then switch it to delta.

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A s tar delta starter is a type of reduced voltage starter. We use it to reduce the starting current of the motor without using any external device or apparatus. This is a big advantage of a star delta starter, as it typically has around 1/3 of the inrush current compared to a DOL starter. The starter mainly consists of a TPDP switch which.

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In this method we connect between W2, U2 and V2 on only one side of the motor terminals. This gives us our star equivalent design. When we pass current through the coils the electrons are shared between the phases at the terminals. The two ways we just saw of configuring the motor in star or delta are fixed methods.

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Here you can learn the fundamentals and operation of star-delta starters. When an induction motor is started directly online, it tends to draw a starting current ranging between 6 to 10 times its normal full load current. It can result in voltage sags. A star-delta starter can help to reduce this starting current by 33%.

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