27hillcrest
Senior Member
What is the useable KW from KVA? Say you have a 75kva xfmr I know you can't get 75kw out of it.
What would the calc. be for this?
TIA
What would the calc. be for this?
TIA
KVA to KW
- Thread starter 27hillcrest
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A 75KVA transformer will give you 75KW into a 100% resistive load. It will take slightly more than 75KVA input power to do that, due to transformer losses. Now most loads aren't resistive; they have a complex impedance. We describe these loads as having resistive and reactive components, and they shift the phase angle of the current away from being in-phase with the voltage. When that happens, the amount of KW that can be supplied starts dropping.
There is a ton of information on the internet on how to work the so-called 'power triangle', using KW, KVA, KVAR, and PF. For an example, lets take a 0.8 power factor load. PF=KW/KVA. A 75KVA transformer supplying a 0.8 power factor load will only be able to deliver 0.8=KW/75 or 60KW.
There is a ton of information on the internet on how to work the so-called 'power triangle', using KW, KVA, KVAR, and PF. For an example, lets take a 0.8 power factor load. PF=KW/KVA. A 75KVA transformer supplying a 0.8 power factor load will only be able to deliver 0.8=KW/75 or 60KW.
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