by Jim Phillips, P.E.
It goes up, it goes down, sometimes it is thought to be infinite (although it really isn’t!) and other times it seems impossible to find. “It” refers to the available short circuit current from the electric utility which is one of the more important pieces of information for an arc flash hazard calculation study. Used to help define the severity of an arc flash hazard, it represents the magnitude of current that could flow from the electric utility during a short circuit.
The available short circuit current is one of two main variables used in performing incident energy calculations. Why would the utility short circuit current change? Why would it change? Who’s fault is it if it affects the results of a study? How can you stay one step ahead of the possible changes?
This webinar is based on Jim Philips’ experience in both arc flash studies, his work with the IEEE 1584 working group, Europe’s IEC TC78-Working Group 15 – Arc Flash Protection and also from experience earlier in his career as the head of the short circuit studies group for a large public utility system.
• Short Circuit Current Data
• Different Data Formats
• MVA, Per Unit, Symmetrical Components
• Changes to the Data
• Utility Planning and Construction Cycle
• Infinite Bus Calculations
• What to Do With Limited Data?
As the number of people registering for this webinar rapidly approached 3000 well before the scheduled event, registration had to be curtailed. Now you can see the recording of the entire webinar here: