Power Transformer Storage
Power Transformer Storage
(OP)
What are some criteria to consider in letting a three-phase 18/24/30 MVA 154/13 kV power transformer sit idle for long periods of time. My particular unit has a nitrogen pressure system and heaters installed on the unit. Is there any detriment in letting the unit sit idle?






RE: Power Transformer Storage
Muthu
www.edison.co.in
RE: Power Transformer Storage
"Theory is when you know all and nothing works. Practice is when all works and nobody knows why. In this case we have put together theory and practice: nothing works... and nobody knows why! (Albert Einstein)
RE: Power Transformer Storage
Bill
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"Why not the best?"
Jimmy Carter
RE: Power Transformer Storage
RE: Power Transformer Storage
RE: Power Transformer Storage
RE: Power Transformer Storage
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: Power Transformer Storage
"Theory is when you know all and nothing works. Practice is when all works and nobody knows why. In this case we have put together theory and practice: nothing works... and nobody knows why! (Albert Einstein)
RE: Power Transformer Storage
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: Power Transformer Storage
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: Power Transformer Storage
RE: Power Transformer Storage
RE: Power Transformer Storage
RE: Power Transformer Storage
You need to multiply your % impedance by the voltage rating of the transformer which will give you the maximum voltage you can use on the primary and short the secondary. I would then choose a voltage around 10-20% of that.
For example: Say you have a 34kV transforer with 10% impedance. The highest voltage you could put on the primary with the secondary shorted would be 3400 volts. However, this will draw full load current on the secondary! Not a good idea. Thus you take about 10-20% of that value for storage. So 340-600 volts or so would be ok to keep it warm.
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: Power Transformer Storage
OP mentioned heaters to keep the windings warm. Then why all the hassle of the disconnecting the HV line, applying the 415 V and shorting the LV, monitoring the current, protecting the sc arrangement etc. and then undo everything when the trafo is needed for quick service ?
Muthu
www.edison.co.in