Transformer Inrush
- Thread starter ReggieD
- Start date
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- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Transformer Inrush
Your best bet is to ask the manufacturer.
But if you want to calculate something yourslef, it is a simple application of Ohm's Law to numbers that are not simple to find. The impedance values that you have are most likely the steady state value. During the first few moments that a transformer is being energized, the impedance is much lower. Do you have the "transient reactance" and the "sub-transient reactance" values? If so, then divide the rated primary voltage by those two values, and you will get the short term and the "even shorter term" values on current.
Your best bet is to ask the manufacturer.
But if you want to calculate something yourslef, it is a simple application of Ohm's Law to numbers that are not simple to find. The impedance values that you have are most likely the steady state value. During the first few moments that a transformer is being energized, the impedance is much lower. Do you have the "transient reactance" and the "sub-transient reactance" values? If so, then divide the rated primary voltage by those two values, and you will get the short term and the "even shorter term" values on current.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: Transformer Inrush
To take a guess, use 12xFLA of each transformer, then add them all up if they are energized separately.
Always best to verify with a disturbance type meter.
To take a guess, use 12xFLA of each transformer, then add them all up if they are energized separately.
Always best to verify with a disturbance type meter.
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