How does one determine magnetizing current for a transformer? I need to figure out what the monthly cost is going to be for a 15kva 240D-208Y120 transformer to sit energized with little to no load.
How does one determine magnetizing current for a transformer? I need to figure out what the monthly cost is going to be for a 15kva 240D-208Y120 transformer to sit energized with little to no load.
You mean the no load losses?!
3% is a conservative estimate.
close enough.so I am getting around 324 kwh/mo is that right?
That would get you VA rather than W and, on no load, the transformer pf is generally quite low.With the transformer in a no load condition measure the current. it'll get you in the ball park.
How does one determine magnetizing current for a transformer? I need to figure out what the monthly cost is going to be for a 15kva 240D-208Y120 transformer to sit energized with little to no load.
What is the ball-park for a testing on this size unit as a comparison to the no-load loss?This sounds like one of those energy cost savings ideas. Keep in mind that if you idle a dry type transformer for any period of time you need to put it in layup. If it justs sits there de-energized the windings and insulation will absorb moisture and may fail when you energize it, so much for cost savings. You also need to factor the cost of labor to put it into a layup condition and to prepare it for re-energizing later and testing prior to re-energizing.
What is the ball-park for a testing on this size unit as a comparison to the no-load loss?
This sounds like one of those energy cost savings ideas. Keep in mind that if you idle a dry type transformer for any period of time you need to put it in layup. If it justs sits there de-energized the windings and insulation will absorb moisture and may fail when you energize it, so much for cost savings. You also need to factor the cost of labor to put it into a layup condition and to prepare it for re-energizing later and testing prior to re-energizing.