what's the reason for not generating high voltage dc?

[vignesh ssvv]

while learning about hvdc, I read that high voltage dc cannot be generated due to commutation problems. can anyone please explain me, what does that commutation problem refer to?

 

[unknown230]

Can you elabrote your question?? I came to some understanding from your question but I want to confirm does you are asking same thing...

 

[KerimF]

Switching off a DC current powered by a high voltage source produces an electric arc much stronger than in case of AC.
In case of AC, the strength of this high electric field that is built between the switch contacts (to cut off the current) is reduced automatically when the AC voltage (its absolute value) decreases and crosses zero volt.

 

[vignesh ssvv]

I just want to know, what really happens inside the commutator of dc generator. when high voltage dc is generated.