Calculating Transformer Inrush current
Calculating Transformer Inrush current
(OP)
We have a 150kVA Transformer for which we have got the inrush current from the manufacturer. Now we also have 200-400m of cable (cable length differs for each transformer), which should have an effect on the inrush current. Is it possible to calculate the revised inrush current values, if the cable parameters are known?






RE: Calculating Transformer Inrush current
RE: Calculating Transformer Inrush current
Thanks.
Bill
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"Why not the best?"
Jimmy Carter
RE: Calculating Transformer Inrush current
If the cable is on the secondary of the transformers, it will have no affect at all if open circuited. If there is load on the transformer when it is energized, the additional cable will add very slightly to the load and therefore add a extremely slight amount of damping.
The random point on wave closing will have more affect than cable and completely mask any change in inrush characteristics due to the cable.
RE: Calculating Transformer Inrush current
Yours
Bill
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Calculating Transformer Inrush current
A long primary cable will increase the source impedance and reduce the available fault current. Inrush will be lower.
RE: Calculating Transformer Inrush current
RE: Calculating Transformer Inrush current
RE: Calculating Transformer Inrush current
RE: Calculating Transformer Inrush current
"two things that change inrush the most are per unit voltage at time of energization ... the lower the voltage the less inrush;"
Actually it is reverse lower voltage -> bigger inrush. Worst case is switching on zero voltage.
I now this is relativly old post but I am new on forum and now I was read it.
Milovan Milosevic
RE: Calculating Transformer Inrush current
Basically, the model used in this paper investigate the inrush phenomenon and some parameters that affect the duration and the amplitude.
RE: Calculating Transformer Inrush current