Hello, I am wondering whether we size the breaker on the secondary side of the transformer based on the loading or the full load capacity of the transformers.
I have a 75/100/125 MVA and the secondary is 26.4KV. yes, these are huge transformers. I do not know the cable ratings. So, is it a practise to size the breaker based on the base rating of the transformer (75 MVA in this case) or based on the fan rating (125MVA is the worst case here)? I know sizing for 125MVA is a safe bet but again it costs more and some times looks over commital.
Thanks for any help
I have a 75/100/125 MVA and the secondary is 26.4KV. yes, these are huge transformers. I do not know the cable ratings. So, is it a practise to size the breaker based on the base rating of the transformer (75 MVA in this case) or based on the fan rating (125MVA is the worst case here)? I know sizing for 125MVA is a safe bet but again it costs more and some times looks over commital.
Thanks for any help