After a power or distribution transformer is disconnected from the power grid or when a DC current is applied to it, for example during a routine winding resistance measurement, the transformer core is likely to have some remnant magnetism. This remnant magnetism will generate high over currents when the transformer is re-energized, and this is commonly known as transformer Inrush Current.
This Inrush current, which runs for a few cycles, reaches a maximum when the polarity of the half cycle is the same as the polarity of the remnant magnetism, and could damage the transformer itself, or other components connected to it. To avoid this undesirable effect a transformer should be demagnetized after testing is complete and before being re-energized.
In this webinar, we will take a look at the influence of residual magnetism on inrush current, the influence of residual magnetism on electrical routine and diagnostic measurements and finally, the art of accurate demagnetization.
Protec is an administratively-approved course provider for the InterNational Electrical Testing Association (NETA).
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