Supply Bus Isolation Advice
Supply Bus Isolation Advice
(OP)
Hi
I've got a situation where I will be drawing 255A from a 3-phase power bus. I'd like to use good design practice in its implementation, and I'm still in the learning process for power electronics. (computer engr. here)
I'd like a level of protection between the bus and the load. Correct me if I'm wrong, but if I was to rely on the bus plug fuses for protection, it would protect the load...however upon tripping...it would send a ripple down the line that could affect or damage equipment also on the bus.
I was thinking a 480 to 480 transformer. That way the line may be slightly more conditioned, and if it blows, it won't send quite the ripple down as if the entire bus plug went.
What do you think? Is it necessary for a transformer, or maybe a fusible disconnect would add that layer of protection? Any ideas that are in the same price area or cheaper?
Thanks much!
I've got a situation where I will be drawing 255A from a 3-phase power bus. I'd like to use good design practice in its implementation, and I'm still in the learning process for power electronics. (computer engr. here)
I'd like a level of protection between the bus and the load. Correct me if I'm wrong, but if I was to rely on the bus plug fuses for protection, it would protect the load...however upon tripping...it would send a ripple down the line that could affect or damage equipment also on the bus.
I was thinking a 480 to 480 transformer. That way the line may be slightly more conditioned, and if it blows, it won't send quite the ripple down as if the entire bus plug went.
What do you think? Is it necessary for a transformer, or maybe a fusible disconnect would add that layer of protection? Any ideas that are in the same price area or cheaper?
Thanks much!






RE: Supply Bus Isolation Advice
RE: Supply Bus Isolation Advice
Damage to be prevented is under the assumption this large spike does exist. Further down the bus it could affect the highly sensitive data acquisition equipment we use, or trip an old fuse on a sensitive high priority production machine, mess up a calibration on something dedicated to precision...I guess it could do all sorts of things...I think its less worry about fireworks and dramatic things as it is messing up something small that would affect product.
Its all under assumption that he was right, he's been at it 30 years though...I'm still pretty green and this isn't what I was hired for lol.
RE: Supply Bus Isolation Advice
But your resident guru should know your system better than we do.
If you are also concerned about power quality issues from whatever it is this feeder is serving, the fuse or breaker will do nothing about this.
RE: Supply Bus Isolation Advice
RE: Supply Bus Isolation Advice
P.S. it works both for EU(230) and US (120V) market I just wrote EU values because I am from Europe. Principles are the same :)