High clearing time causing high IE
High clearing time causing high IE
(OP)
Hello,
I am doing an analysis on a system with an 800A 600V bus. The arc-fault current is calculated to be lower than my instantaneous setting on my circuit breaker, but I cannot lower the inst. setting as it will overlap the transformer inrush current. The arc flash energy is thus really high as the clearing time is not optimal. Are there reliable mitigation techniques (keep in mind this project is on a tight budget) so as to keep the incident energy at a reasonable level?
Thanks
I am doing an analysis on a system with an 800A 600V bus. The arc-fault current is calculated to be lower than my instantaneous setting on my circuit breaker, but I cannot lower the inst. setting as it will overlap the transformer inrush current. The arc flash energy is thus really high as the clearing time is not optimal. Are there reliable mitigation techniques (keep in mind this project is on a tight budget) so as to keep the incident energy at a reasonable level?
Thanks






RE: High clearing time causing high IE
If you can't adjust the settings downward then you could look at some form of unit protection to get rapid fault clearance in the protected zone. How tight is 'tight'? Are you worried about dollars or hundreds of dollars?
RE: High clearing time causing high IE
RE: High clearing time causing high IE
RE: High clearing time causing high IE
RE: High clearing time causing high IE
RE: High clearing time causing high IE
RE: High clearing time causing high IE
1. Replace breaker with modern version that has arc flash switch
2. Use "maintenence setting", lower INST setting if work is being done downstream.
3. Use a remote operator