Transformer AirCore Reactance
Transformer AirCore Reactance
(OP)
For a 15/20MVA, 27.6 to 13.8KV transformer,does anybody know where I can find air core reactance value?
Thanks
Thanks
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Transformer AirCore Reactance
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RE: Transformer AirCore Reactance
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If we learn from our mistakes I'm getting a great education!
RE: Transformer AirCore Reactance
RE: Transformer AirCore Reactance
RE: Transformer AirCore Reactance
Asking for the air-core reactance of an iron-core transformer is to indicate the properties WHEN saturated.
RE: Transformer AirCore Reactance
I am modeling a transformer inrush urrent through PSCAD. One of the ways to simulate high inrush is through changing saturation constants- The other variable is the Knee Voltge.
The software default value is 0.14 p.u.
RE: Transformer AirCore Reactance
I haven't heard anyone request this before. For inductors it's clear. This would be the point where the core's relative permeability is 1. So it's as though the core isn't there. This is really more a theoretical number since It would take so much current in an inductor that the coil would burn up straight away or come apart from short circuit forces. But in a transformer, to achieve true hard saturation requires extreme overvoltage to the point of likely turn to turn isulation failure. Even if that didn't occur, the exciting current would be extreme, just like in the inductor.
If you just want to know the short circuit impedance, then the transformer's rated impedance will probably be adequate. ie 4%Z => 1/.025 = 40 times rated amps. That's all the current a bolted fault would develop.
Neil
RE: Transformer AirCore Reactance
Neil