Is there a particular aspect of selection that is of concern, or are you looking for ideas of things to watch for?

It's not 2000Vdc but 1500Vdc and a couple of thousand amps is not uncommon for utility solar PV and battery storage systems providing grid services. Obviously that's not your project and the load characteristics are different but depending on the area of concern you might be able to open the field a little. That said most of the kit ratings top out at 1.5kV nominal (yes plus headroom) due to the cut-off for the definition of low voltage in fixed installations.

Thanks for this Jam.Yes I am seraching for bus bar selection for this. The rated bus bar current is about 1800Amps. Can we use the busbars for same size which is rated for 400VAC, FOR 2000VDC ?

Can we use the busbars for same size which is rated for 400VAC, FOR 2000VDC ?

Not without knowing exactly what you are doing, no, certainly not  !

The cross-sectional area of copper for carrying a given current will be more or less the same, maybe a bit less, as DC will flow in the bulk, when AC suffers from skin effect. Far more seriously the insulation and support arrangements that are designed to give good clearances and creepage distances so as not to break down at 400VAC (*) will have some margin, but almost certainly not enough for 2000V - they may. hold 2kV in a sterile environment for a lab test, and a very short duration 8kV flash test, but that is not the same as being OK with 2000 Vfor many years in real service conditions, and the transients associated with switching that. The effect of any arc -event is likely to be far more serious with DC than AC, and allowance also needs to be made for that in the strength of containment. It would be a well over engineered 400V design that could be used at 2000V without modification.

If you have been asked to design this, then I suggest enlisting a specialist, and also talk to the bus-bar makers - this is a problem that will have been solved before - as jam suggests the chaps that do large solar or batteries for the network support are probably worth asking.

Mike.

*) I'm not sure if by 400VAC you mean 400V phase to phase or phase to ground, but it is so far out it makes no change to the conclusion.

Can we use the busbars for same size which is rated for 400VAC, FOR 2000VDC ?

Not without knowing exactly what you are doing, no, certainly not  !

The cross-sectional area of copper for carrying a given current will be more or less the same, maybe a bit less, as DC will flow in the bulk, when AC suffers from skin effect. Far more seriously the insulation and support arrangements that are designed to give good clearances and creepage distances so as not to break down at 400VAC (*) will have some margin, but almost certainly not enough for 2000V - they may. hold 2kV in a sterile environment for a lab test, and a very short duration 8kV flash test, but that is not the same as being OK with 2000 Vfor many years in real service conditions, and the transients associated with switching that. The effect of any arc -event is likely to be far more serious with DC than AC, and allowance also needs to be made for that in the strength of containment. It would be a well over engineered 400V design that could be used at 2000V without modification.

If you have been asked to design this, then I suggest enlisting a specialist, and also talk to the bus-bar makers - this is a problem that will have been solved before - as jam suggests the chaps that do large solar or batteries for the network support are probably worth asking.

Mike.

*) I'm not sure if by 400VAC you mean 400V phase to phase or phase to ground, but it is so far out it makes no change to the conclusion.