The power circuit uses to create contact between the motor and three phase power supply. In this tutorial we will show the star delta y δ 3 phase induction ac motor starting method by automatic star delta starter with timer with schematic power control and wiring diagram as well as how star delta starter works and their applications with advantages and disadvantages.
Automatic Star Delta Motor Starter Electrical Technology
Star delta starter diagram. Here the circuit diagram of star delta starter explained in detailhere you will learn the connection of star delta starter with three phase motorthe power circuit diagram and control circuit diagram of an automatic star delta starter are explained belowlets understand the star delta starter diagram. A star delta starter is a type of reduced voltage starterwe use it to reduce the starting current of the motor without using any external device or apparatus. Star delta connection diagram and working principle. Star delta starters consist of a power circuit and control circuit. Wiring diagram star delta connection in 3 phase induction motor. Refer to the below star delta circuit.
Star delta starter is an electrical motor starting device generally uses in big size motor to overcome some technical limitation. It can be seen that in star connection one end of all three windings are shorted to make star point while other end of each winding is connected to power supply. A dual starter connects the motor terminals directly to the power supplyhence the motor is subjected to the full voltage of the power supplyconsequently high starting current flows through the motor. This is a big advantage of a star delta starter as it typically has around 13 of the inrush current compared to a dol starter. For three phase motor we use the direct online starter but mostly for small three phase motor. Star delta connection circuit diagram.
Star delta starter wiring diagram this post is about the main wiring connection of three phase motor with star delta starter and control wiring diagram of star delta starter. Star delta motor starter the following figure shows the winding connections in star and delta configuration one by one. This type of starting is suitable for small motors below 5 hp 375 kw. In the diagram of power circuit of star delta starter u2 and v2 of 3 phase motor should be connect to 4 and 6 respectively instead of u2 and v2 are connected to 6 and 4 of delta contector km2. Star and delta means here 2 separate states of motor running first star connection and then delta connection. The control circuit uses to control the starter circuit such as on off and tripping operations.
There is minor correction is require to change printed in boxes sequence of 3 phase wires from w2 v2 u2 to w2 u2 v2 to get delta connection properly. Of control star delta or wye delta suitable for applications requiring a lower starting current than when using dol starter. But high load 3 phase motor we use the star delta starter for motor.
Gallery of Star Delta Starter Diagram
