Arc Flash Hazard Analysis

[undervoltage]

While we carry the Arc Flash Analysis using SKM or ETAP, we will get the results for Incident energy, Arc Flash Boundry and PPE required for that particular switchgear. Now the results will depend upon Short Circuit and Coordination Studies.

The question I have is that now a days there are protective relays specially designed for Arc Flash Protection which require only Light & Current or only Current or Only Light input to detect the arc and trip the breaker. These systems are not dependent on Short Circuit or Coordination Studies. Can we model such systems in SKM or ETAP and see the impact. Anybody have such experience?

Thanks

 

[LionelHutz]

Your approach sounds fine but you have the breaker opening time set to 0 in your picture so does that mean you using 30mS as the total trip + clearing time? It would be better to put the actual times in for each item, even if just for future reference/clarity.

 

[undervoltage]

LionelHutz:

I agree with you, the image is just a reference. Actual trip time for breaker will be there.

 

[Maak]

I agree with "jghrist" and "davidbeach".

Some people seem to have serious attitude problems related to light & overcurrent based systems which provide the fastest protection and lowest incident energy. Because several major manufacturers are turning to this well-known technology, there is a strong indication that this is the winning technology.