Transformer Energization/Inrush

[MajalaLearning]

They way I understand transformer magnetization and inrush, after any sort of power loss the transformer would still have to go through inrush again since the core could be at any level of saturation... However I have heard that in situations where a power flickers in and out, or is shut off quickly and then restarted the transformer did not need to go through another inrush period (as if it somehow stayed magnetized). Is this possible for very small periods of power loss?

 

[jim dungar]

They way I understand transformer magnetization and inrush, after any sort of power loss the transformer would still have to go through inrush again since the core could be at any level of saturation... However I have heard that in situations where a power flickers in and out, or is shut off quickly and then restarted the transformer did not need to go through another inrush period (as if it somehow stayed magnetized). Is this possible for very small periods of power loss?

Kind of.
When power is lost it takes a while for the magnetic field to decay.
When the power returns and it is in sync with the decaying field there may be little to no inrush.
When the power returns and it is out of sync with the field there may be a longer than normal inrush.

 

[MajalaLearning]

Kind of.
When power is lost it takes a while for the magnetic field to decay.
When the power returns and it is in sync with the decaying field there may be little to no inrush.
When the power returns and it is out of sync with the field there may be a longer than normal inrush.

Okay that makes sense as to how I was thinking about it originally...its not that a short period of power loss changes the inrush characteristics, its still just dependent on the flux and voltage sync. Thank you for clarifying!