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What is the use of delta stare switch?

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Question ajoutée par hassan qutb , Facility&Engineering Manager PMP. , مقاولات خاصه
Date de publication: 2013/11/15
muhammad arif
par muhammad arif , Assistant Engineer , Phoenix armour

control on current save machine

حسام ناجى
par حسام ناجى , testing and commissioning engineer II , SENDAN INTERNATIONAL COMPANY

to reduce the current in the start stage

tamer nassar
par tamer nassar , Engineering manager , Port Said food and beverage Company

you meaning star - delta connection ,it's aconnection to protect  the motors against  starting current , that current very high because if  the torque increase the current will be increase , we used that application in more than 5.5 or7.5 kw ,and also we used that apllication star-delta connection because current in  negma connection low than delta connection ,so we start by negma connection to protect and limited starting current .     

Maher Alasli
par Maher Alasli , service engineer , UNITED WEAVERS

switch designed for use with three-phase star/delta motors. Speed change is approximately in the ratio of1.3:1 and the power saving is up to50%. and it dosn't offer protaction for motor

Leonardo Banzali
par Leonardo Banzali , Electrical Maintenance-trainer , Sadara Chemical Company

If you mean star-delta switch, it is a rotary switching device composed of shifting contacts used as an integral part in the manual control of Wye-to-Delta starting of large squirrel cage induction motors. Wye-to-Delta motor start is implied for reduced voltage starting and minimize the starting current. We just have to closely monitor the RPM, it should be near rated value before switching to shift-over from Wye connected stator winding to Delta because switching earlier can cause inrush current and sudden change in torque that might burden your motor and activate its protection. Hope to share you some ideas. Regards and thanks.

Ahmed Fathy
par Ahmed Fathy , General Manager + EBRD International Adviser , RUBEX for Metal Industries

it used only to save the motor witch biger than22 kw during start .

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