12 posts in this topic

We have to run 1800kw motor for that purpose we have used ABB ACS800 drive , we have taken star and delta output of transformer and given to drive. For star one acb is connected with converter and than inverter and in middle is controller similar is done for delta part . Can anyone explain me why we have taken two sperate dirve cubicle.

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Something is being lost in translation to English, would you be able to upload a pdf of the one line schematic.

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Star vs. Delta secondaries on the transformers have different phase shifts.  This provides your bus charging rectifiers with more unique voltage peaks to reduce the ripple on the DC bus.

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22 minutes ago, pturmel said:

Star vs. Delta secondaries on the transformers have different phase shifts.  This provides your bus charging rectifiers with more unique voltage peaks to reduce the ripple on the DC bus.

@BobLfoot@pturmelbut why we are using both both secondary connection between of transformer for vfd?

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Each secondary is going through its own rectifier to drive the DC bus.  A Star-secondary will be out of phase with a Delta-secondary, so the DC bus will get more charging pulses per cycle.

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2 hours ago, pturmel said:

Star vs. Delta secondaries on the transformers have different phase shifts.  This provides your bus charging rectifiers with more unique voltage peaks to reduce the ripple on the DC bus.

@BobLfoot@pturmel Thank you sir. Sorry to bother you again, you have any literature regarding this topic as i want to understand it more. As I'm new at it,so I'm unable to understand it completely.

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3 hours ago, pturmel said:

Star vs. Delta secondaries on the transformers have different phase shifts.  This provides your bus charging rectifiers with more unique voltage peaks to reduce the ripple on the DC bus.

@BobLfoot@pturmelthank

 

1 hour ago, pturmel said:

Some quick googling for "star delta transformer phase angle" popped up a variety of resources.  I thought this one was the simplest explanation:

https://voltage-disturbance.com/power-engineering/transformer-connections-phase-shift-and-polarity/

@pturmelthank you sir. If you don't mind can you give me your Instagram or anyother social media id ,so I can get in touch with you easily and learn from you.

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18 minutes ago, akashleo said:

your Instagram or anyother social media id

Well, I don't really do any social media.  Certainly not any of the common big platforms.  And I prefer to provide all of my free technical assistance in public so that all may see and benefit.

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@pturmel great feedback , you even taught this old timer and my Power Specialist a couple of things on this thread, thanks!

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13 minutes ago, BobLfoot said:

@pturmel great feedback , you even taught this old timer and my Power Specialist a couple of things on this thread, thanks!

You're welcome.  I'm rather an old-timer, too, just not here.  I updated my profile to be more clear.

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