The Star-Delta 3-phase Motor Starting Method


Posted on Feb 6, 2014

The Star Delta starting method is a motor starting mechanism that minimizes the large amount of starting current that motors draw in. The Star Delta, as the name suggests basically involves feeding the motor with 1/sq. root3 (58%) of the full load current until it attains speed then applying the full load current. This method is commonly referred t


The Star-Delta 3-phase Motor Starting Method
Click here to download the full size of the above Circuit.

o as "Soft Starting" the motor, For this to work the whole set-up requires 3 contactor i. e The Star Contactor, The Delta Contactor & The Main Contactor. However for the motor to be started in Star Delta, its internal connection at the terminal box has to be wired in Delta-giving it capability of receiving the full-load current at any instant. Traditionally, in many regions there was a requirement that all motor connections be fitted with a reduced voltage starter for motors greater than 4KW 5HP. This was to curb the high inrush of starting currents associated with starting induction motors.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Solar Powered Reading Lamp
    1W-cwtransmitter
    High-Gain Current Sensor
    Radio Beacon Converter
    The anti exciting type switching power supply based on FSDM0565R is designed
    1993 vw passat electrical schematic
    mic preamplifier circuit based tlc251
    to verify schematics for 2 motor robot
    Digital AC Voltmeter
    LED Dimmer Lighting
    1000W AC power supply automatic voltage regulator circuit



    Top