Can electrical curents flow from generator to transformer

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Discussion Overview

The discussion revolves around the flow of electrical currents from a generator to a transformer during a power shutdown. Participants explore the implications of using backup power sources like generators and UPS systems in relation to transformer operation and safety protocols.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether current will flow into the transformer circuit when it is shut down and backup power is used.
  • Another participant suggests that the presence of an autotransfer switch may prevent backfeeding from the generator to the utility transformer.
  • A different viewpoint emphasizes the importance of a transfer switch to avoid backfeeding the utility supply, highlighting safety concerns for utility workers.
  • Concerns are raised about the synchronization of backup power with mains power when it is restored, noting potential issues with reactive power surges.

Areas of Agreement / Disagreement

Participants express varying views on the mechanisms and safety protocols involved in using backup power with transformers. There is no clear consensus on the specifics of current flow and synchronization processes.

Contextual Notes

Participants mention various types of transformers and backup systems, but do not clarify specific configurations or assumptions about the electrical setup, leaving some aspects unresolved.

rohithreddyk
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Hi, got a doubt this mng, when I heard the power will be shutdown in my office tomorrow to repair a faulty circuit b/w transformer and my office.


when the transformer is shutdown, and generator/ups/battery is used to keep the power supply to critical components, will the current flow into transformer circuit?
 
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Depends on what transformer you're talking about, but I suspect there is a an autotransfer switch between the main building transformer or utility transformer (if there is one) and the main switchgear that switches between utility power and generator power.

Often, utility power comes in at 480 V (or higher) and is stepped-down to 208/120 after the main switchgear, so that transformer would likely still be powered by a generator.
 
I think he's talking about an on-site generator that supplies the building with power when the mains goes offline. That being the case, it should have a transfer switch which keeps the generator from backfeeding the utility supply transformer. This is why you should never plug a generator straight into an outlet to supply backup power--although you can open the main breaker to keep from backfeeding the utility, all it takes is one moment of carelessness to put the lives of utility workers at risk. Have your home backup generators properly wired with a transfer switch!
 
That's what I was talking about...maybe i wasn't clear.
 
Backup power from UPS/battery and generators can (depending on backup) come on in less than 1 power cycle, and as pointed out in an earlier post, disconnects the mains. The other problem is what happens when the mains power comes back on. Ideally, the backup power should synchronize phase with the mains before the mains are smoothly connected; otherwise ther could be a reactive power surge. Many small battery/UPS systems can do this seemlessly, but I don't know how or whether big diesel/electric standby generators do this.
 
Last edited:
thanks everyone...i got what i was looking for. :approve:
 

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