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amb2000

Member Since 01 Mar 2014
Offline Last Active Apr 21 2014 07:18 AM
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Posts I've Made

In Topic: Current Variation In Line Side And Load Side Of Soft Starters

03 March 2014 - 06:53 AM

Dear Mark,

 

Kindly note for above Point 1 , I would like to share the single line diagram for more clarity.  Please go through this and advise, Soft Starter Line side and the Capacitor bank connection points are the same here. Then why there is difference in current in both Ammeters.

 

Can you please check.

Abhilash


In Topic: Current Variation In Line Side And Load Side Of Soft Starters

03 March 2014 - 04:25 AM

hello amb2000

 

The current drawn by a motor comprises a resistive component and an inductive component.

 

The resistive component is in phase with the voltage and the inductive component is 90 degrees behind the voltage.

The current measured is the vector sum of both the resistive and inductive currents.

 

Power factor correction uses capacitors to draw capacitive current which leads the voltage.

The capacitive current is 180 degrees out of phase with the inductive current and can be used to cancel the inductive current.

 

With power factor correction installed, the current into the motor is the resistive current and the inductive current. There is no change resulting from the addition of the pf correction.

 

The current drawn from the supply is the current into the motor plus the capacitive current.

If the capacitive current is equal to the inductive current, the inductive current is cancelled from the supply, so the net current is reduced.

This is the whole role of pf correction.

 

Best regards

Mark

Hello Mark,

 

Thanks for your kind support, Just need to check with you few things,

1) Is there any possibility of making both the currents the same. How we can reduce the current in the Outgoing side of Soft Starter as we cannot connect the capacitors in the Outgoing side. 

2) Is this the same scenario in all the circuits where ever SoftStarters and Drives are coming along with Capacitor banks.

3) Can I advise my customer, our system is working perfectly and there is no problem to worry in this regard.

 

Please reply me 

Abhilash


In Topic: Current Variation In Line Side And Load Side Of Soft Starters

02 March 2014 - 10:13 AM

Can you please provide your mail ID, I will sent it thru it or kindly advise how to share here

 

Abhilash