I have questions relating the step up xfmr. Hope some one can enlighten me little bit.
Need to run an emergency feeder (480V) from a power plant, which has (3) 2000kw generators with a paralleing switchgear, to new bed tower. The problem is new bed tower is about 3000ft away from the power plant. So, I am trying to step up the voltge to 4160V and step it down to 480v at the bed tower.
First question is the options for the step up xfmr. I think I can think of three options but I am not sure which one is the best design as far as the reliability and cost. Would be able to tell me the pros and cons of following options and tell me what you think the best option is?
Option 1: Delta (480V) to Wye (4160V) and not using the neutral.
Option 2: delta to delta with corner gruounded.
Option 3: Delta to delta with high resistance ground.
Option 4: Delta to delta with ungrounded.
Second question is realted to the xfmr magnetization inrush current. I thought the xfmr inrush is about 12x of FLA (3000A). But I was told from the xfmr mfgr that I will have about 24x of FLA (72,000A) for 6-cycle. I think I will be able to pick the right cb so that I can overcome the inrush current but I am wondering if the generator can handle that much current. Will the generator can start under the such a huge inrush?
Thanks for your answers in advance.
Need to run an emergency feeder (480V) from a power plant, which has (3) 2000kw generators with a paralleing switchgear, to new bed tower. The problem is new bed tower is about 3000ft away from the power plant. So, I am trying to step up the voltge to 4160V and step it down to 480v at the bed tower.
First question is the options for the step up xfmr. I think I can think of three options but I am not sure which one is the best design as far as the reliability and cost. Would be able to tell me the pros and cons of following options and tell me what you think the best option is?
Option 1: Delta (480V) to Wye (4160V) and not using the neutral.
Option 2: delta to delta with corner gruounded.
Option 3: Delta to delta with high resistance ground.
Option 4: Delta to delta with ungrounded.
Second question is realted to the xfmr magnetization inrush current. I thought the xfmr inrush is about 12x of FLA (3000A). But I was told from the xfmr mfgr that I will have about 24x of FLA (72,000A) for 6-cycle. I think I will be able to pick the right cb so that I can overcome the inrush current but I am wondering if the generator can handle that much current. Will the generator can start under the such a huge inrush?
Thanks for your answers in advance.