Hi there, does anybody know roughly what the cost differential (in percent) would be for a transformer of a given size, but with alternate primary voltages?
For example, take a 2MVA 600V secondary transformer.. if we take 13.8kV primary as the base, what would be a rough %-adder be for 24.94kV...
Hello, I have a situation where we have a 4.16kV/480V delta/wye w/ 5A NGR, and we want to step it up to 25kV.
If we had the money and time, I would order a 480/25kV delta/wye (or a 4.16/25kV delta/wye actually)… but all we can find is 480/25kV delta-delta and wye/delta (ie: a step down...
Hello,
I've got a 2500A, 600V run to put in, and I'd like to use 15x1c-350MCM 100% spaced as per CEC Table 1 (Canadian project). My question is what would be the optimal conductor and phasing arrangement to minimize the inductive reactance differences. Any tips or references would be much...
Hello,
As per CSA M421, and I think several other mining electrical codes around the world, the ground potential rise (GPR) is limited to 100V for underground and open pit mines. Since the GPR at the main utility tie sub is usually much higher than this, the UG mine substation power grounding...
Hi all,
I've somewhat recently started my own engineering firm, and while I've designed many substations while working at larger companies, I now am basically on my own and don't have access to their vast technical resources (ie: senior staff with specializations on many issues). I was...
