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Why do we use delta_star connection to drive electrical motors?

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Question added by Hasan Ahmad Ali Mohammad , Production Engineer , Gulf Grilles Company
Date Posted: 2016/06/19

To reduce starting current 3-4 times than full load current and to increase the starting torque

ARULSAMY JOHNRAJ
by ARULSAMY JOHNRAJ , Senior Electrical Tech-Lead , JGC

To lower the starting current of motor.Motor first start in star connection .

S. M. Omar Faruk
by S. M. Omar Faruk , Assistant Manager (Engineering) , Pacific Jeans Ltd. , CEPZ, Chittagong

When high starting torque is required along with a constant running speed in an application,  star-delta connection of motor is applied. But not delta-star connection is applicable in motor control.  

Ramner Navarro
by Ramner Navarro , QA/QC Electrical Engineer , Al Arrab Contracting Company

star and delta is the two basic three phase connection. when you need more current and a neutral point then star connection is practiced but when high voltage is concerned then delta is used. for star connection line currents are equal to phase current and line voltage is root 3 times of phase voltage as for delta connection phase voltage is equal to line voltage but line current is root 3 times of phase current.

Wasimakram Shaikh
by Wasimakram Shaikh , MAITAINCE TECHNICAN ELECTRICAL , INDIAN OIL CORPORATION

minimaz the line voltage thus line current with low tourqe in starting 

Ahmed Fuad Mohammed  Humaid
by Ahmed Fuad Mohammed Humaid , Free Works , work for myself

To decrease the starting current when the motor starts its operation.

irfan  ahmed
by irfan ahmed , Electrical Technician , KUWAIT OIL COMPANY

To limit the starting current and torque

Muhammad Qasim Akram
by Muhammad Qasim Akram , Senior Electrical Technician , Pakistan Petroleum Limited

to mimimize line voltage thus line currect with low torque in starting and inrush to the sytem....then switch to delta as normal running...

 

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