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pros and cons of two different transformer configurations

pros and cons of two different transformer configurations

pros and cons of two different transformer configurations

(OP)
Originally the plan was to use four 6.6/0.4 kVA and grouped generators totaling 2 MW and have four distribution panel. We have already purchased the generators and the transformers. Recently city power starting upgrading the grid to 20 kV and it is a lot more stable so and thereformer want to upgrade too. We are now considering two options.
Option 1:
Two 20/0.4 kV each 2000 kVA. Connect one 20/0.4 to two 6.6/0.4 xformers. We plan to have four manual change over to select between the two with the 20/0.4 being the priority.

Option 2:
Two 20/6.6 kV each 2000 kVA. They will be connected in parralel. The four 6.6/0.4 will be connected to a common busbar. The output of the parallel configuration will be the busbar.

i want to know what are any technical advantages and disadvantages of each of the configs. Thank you.

RE: pros and cons of two different transformer configurations

Looks like you're overly attached to the 6.6 kV/0.4 kV transformers that you bought with the generators.

Is there any reason you can't go with a single 20 kV / 0.4 kV 2000 kVA transformer?  The generators could then all be connected to the 400 V bus.  This is a lot simpler arrangement.

I'm assuming the generators are all rated 400 V and not 6.6 kV.  Correct?

  

RE: pros and cons of two different transformer configurations

(OP)
Not attached at all but we already have the 6.6/0.4 xformers and have to make use of them. We were just thinking if we have that and the 20/0.4 kV then we will have three sources of power:
priority 1: 20/0.4 kV
priority 2: 6.6/0.4 kV
priority 3: gensets

I just want to know if there are any technical difficulties/challenges/advantages of either option.

RE: pros and cons of two different transformer configurations

I approached this on the basis of - if I had to do it all over again, what would make the most sense.

It's a much cleaner and lss expensive arrangement going from 20 kV to 400 V.  If you don't, you pay a penalty in having 2 transformations.  It gives you higher losses and more voltage drop.

I'd either sell or the 6.6 kV to 0.4 kV transformers or use them somewhere else.  At this point, it's a sunk cost, so it shouldn't bias your decision in light of the fact that 20 kV is now introduced.

I'll shut up and let others chime in.

 

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