Wiring Diagram For Auto Transformer Starter

An autotransformer starter reduces inrush current by using a transformer in the line just ahead of the motor to step down the voltage applied to the motor terminals.

Wiring diagram for auto transformer starter. The figure below shows the motor with the auto transformer starter. By reducing the voltage the current drawn from the line is reduced during start up. In contrast to the star delta connection only three motor leads and terminals are required. Assortment of 3 phase motor starter wiring diagram pdf.

Variety of control transformer wiring diagram. It reveals the components of the circuit as simplified forms and also the power and signal links in between the gadgets. Stage 1 at starting auto transformer is star connected by activating star contactor km1 and then the run contactor km2 is closed. The standard taps are 50 65 and 80 of the full line voltage stage 2 after the preset time delay the star contactor km1 is opened.

The auto transformer starter is more expensive more complicated in operation and bulkier in construction when compared with the star delta starter method. Auto transformer starter 10102010 by lemau 9 comments this starter produces high efficiency and have the option to be adjusted to obtain the necessary torque and in accordance with the systemit very efficiency stater but the disadvantage is it very high cost to setup control panel stater. But an auto transformer starter is suitable for both star and delta connected motors and the starting current and torque can be adjusted to a desired value by taking the correct. This arrangement start an induction motor with reduced voltage and the value of voltage depends upon the ratio of tap selected.

Auto transformer starter 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. When the setting time on the timer has expired the autotransformer is bypassed. An auto transformer starter makes it possible to start squirrel cage induction motors with reduced starting current as the voltage across the motor is reduced during starting.