Star delta problem pdf8/31/2023 Star delta starter consists of a power MCB and Three Pole Double Throw (TPDT) Switch. Schematic diagram of star delta starter is shown below. This nomenclature can easily be seen in the motor terminal box. Sometime it is also marked as (U1, U2) for R phase, (V1, V2) for Y phase and (W1, W2) for B phase. The winding terminals corresponding to R, Y & B phases are generally designated as (A1, A2), (B1, B2) and (C1, C2) respectively. This itself means that all the six winding terminal of motor must be taken out and connected to the starter. Working Principle of Star Delta StarterĪs discussed earlier, star delta starter automatically changes the motor winding configuration from STAR (during starting) to DELTA (when the motor reaches its rated speed). Star Delta Starter is one among the various starting methods. In order to limit this starting current to some reasonable value, some methods are adopted to start three phase induction motor. Due to this voltage dip, the other equipment connected to the supply may get effected. This high value of starting current may result in considerable voltage dip of the supply line feeding the motor. This means, if the rated current of a motor is 20 A then during starting it will take around 100 to 140 A. As we know that when a 3 phase induction motor is started at its rated voltage, it draws high inrush current whose magnitude is around 5 to 7 times of the rated motor current.
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