Arc-Flash Analysis
Abhijit Potdar (PSCAD,EMTP-RV,PSSE,DigSilent,ETAP,ATP,TARA)
Power System professional with precise blend of ‘Renewable interconnection and Transmission Planning’ to ‘ISO/RTO Energy Markets’ with balance of ‘Techno Economical’ and ‘Grid code compliance’ of Power Systems
Arc-Flash Analysis calculations are performed to determine “...the arc-flash hazard distance and the incident energy to which one could be exposed during their work on or near electrical equipment”.
An Arc-Flash Hazard Analysis is to determine employee Personal Protective Equipment (PPE) requirements. Arc-Flash calculations can be conducted in accordance with IEEE-1584 and NFPA 70E standards.
The Arc-Flash Hazard Analysis combines the existing short-circuit calculation, Relay coordination settings and requires the following additional data, depending on the method used:
? IEEE-1584: Conductor Gap, Distance Factor, Working Distance, and Enclosure type.
? NFPA 70E: Working Distance.
When an Arc-Flash hazard analysis is conducted using the IEEE-1584 method, it calculates the arcing current based on the equations presented in the standard. also calculates the arc resistance required to limit the fault current to the calculated value.
When the NFPA method is selected, the bolted fault current is used for the calculation.
For either method, when use relay tripping times selects, a second calculation is performed at a reduced fault current as per fault clearing time associated.
We compares the results of these two cases and reports on the worst case result.
DSU '23 GOLD MEDALIST Power System Engineer | Load Flow - Short Circuit | Arc Flash | Protection and coordination | on DIgSILENT power factory, ETAP, SKM, EASYPOWER. US | UK | CANADIAN | Projects.
8 个月Danish Uddin
DSU '23 GOLD MEDALIST Power System Engineer | Load Flow - Short Circuit | Arc Flash | Protection and coordination | on DIgSILENT power factory, ETAP, SKM, EASYPOWER. US | UK | CANADIAN | Projects.
8 个月I have made a 33kV system in DIgsilent and was calculating Arc Flash in one of its switchgear. So clicking to the Arc Flash method option in this software ii gave me 2 options IEEE 1584-2018 and NFPA 70E. This NFPA 70E uses only working distance as specified by you in the post but can you guide me that this NFPA 70E uses lee method to calculate it and also tell me is their any standard from where I can get to know that NFPA 70E is actually calculating LEE method in its back end.