Series Inductor-Limit Fault current
Series Inductor-Limit Fault current
(OP)
has anyone had experience using and Impedance to limit the fault current inorder to limit the ARC Flash Cat at the main switchgear?
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Series Inductor-Limit Fault current
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RE: Series Inductor-Limit Fault current
I don't think it is going to be a practical solution unless you are just trying to go from 40.1 cal/cm2 to 39.9 cal/cm2.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: Series Inductor-Limit Fault current
There might be more to this than I am thinking of right now!
RE: Series Inductor-Limit Fault current
RE: Series Inductor-Limit Fault current
It depends on the rate of change in the clearing time as a function of fault current. For the same clearing time, more current = higher arc energy.
If you're on the short-time delay of a 480 V trip unit, the clearing time stays constant over a fairly wide range of current.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: Series Inductor-Limit Fault current
However, it is possible to order transforers with a higher inpedance. But the higher impedance also develops higher losses.
The exception to the reactor loss condition is when it is placed between two load serving transformers (assuming the load serving bus is served by more than one transformer). In this case the reactor won't see load all the time, and thus whon't incure the losses.
Other schemes to reduce arc flash are to use a neutral impedance on the load serving transformer. Or current limiting fuses.
RE: Series Inductor-Limit Fault current