Posted 19 Jun 2021 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. Share this post Link to post Share on other sites
Posted 19 Jun 2021 Something is being lost in translation to English, would you be able to upload a pdf of the one line schematic. Share this post Link to post Share on other sites
Posted 21 Jun 2021 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. Share this post Link to post Share on other sites
Posted 21 Jun 2021 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? Share this post Link to post Share on other sites
Posted 21 Jun 2021 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. Share this post Link to post Share on other sites
Posted 21 Jun 2021 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. Share this post Link to post Share on other sites
Posted 21 Jun 2021 19 minutes ago, akashleo said: you have any literature regarding this topic 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/ Share this post Link to post Share on other sites
Posted 21 Jun 2021 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. Share this post Link to post Share on other sites
Posted 21 Jun 2021 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. 1 person likes this Share this post Link to post Share on other sites
Posted 22 Jun 2021 @pturmel great feedback , you even taught this old timer and my Power Specialist a couple of things on this thread, thanks! Share this post Link to post Share on other sites
Posted 22 Jun 2021 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. Share this post Link to post Share on other sites