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 Post subject: ETAP 18x Arc Flash Module ArcFault(TM)Posted: Fri Jan 25, 2019 10:39 am

Joined: Tue Apr 05, 2016 11:44 am
Posts: 5
I am interested in opinions on utilizing the new ETAP ArcFault module available for version 18x. Has anyone used this calculation method for there MV(>15kV) and HV studies? ETAP states:
The program was designed to comply with the requirements of the following standards:
OSHA 1910.269 Appendix E Tables 2, 3
NESC C2 2012
NESC C2 2017

Further ETAP states:
ArcFault Method 1 – Terzija / Konglin
This option tells the ArcFault program to use equations derived based on this research paper: “Long Arc in Free Air: Laboratory Testing, Modeling, Simulation and Model-Parameters Estimation” by V.V. Terzija and H.J. Koglin. This method aimed at describing the physical behavior of long arcs that were initiated under laboratory conditions at the FGH-Mannheim high power test laboratory in Germany. In this model, the arc is reduced to a current-dependent voltage source with the characteristics of a distorted rectangular waveform. This is explained in more detail in the calculation methodology section of this chapter.

ArcFault Method 2 – EPRI HVAC AF
This option is the default (preferred) calculation method for arc fault incident energy. When this option is selected, the ArcFault program uses equations derived based on the Arc Flash Issues in Transmission and Substation Environments – 2011 Technical Report. This empirical method was formulated as a result of this research project. The model applied by ETAP uses all the equations provided in this document. The model also provides for a statistical correction factor which allows the user to define a desired worst-case scenario. This is explained in more detail in the calculation methodology section of this chapter.

I have this module and use ETAP exclusively. Given all calculation methods are explained in detail, these methods seem to be as good or better than ARCPRO(?), and Method 2 above is based on 'empirical' data.

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 Post subject: Re: ETAP 18x Arc Flash Module ArcFault(TM)Posted: Wed Jan 30, 2019 12:10 am

Joined: Tue Jan 29, 2019 10:36 pm
Posts: 1
Hey Resowers,

Found your post while searching our selves... Needless to say, this is our first post. We recently did some research into this and created two separate practical models, one with an overhead 115kV transmission system and the other with a 34.5kV switchgear. We used realistic phase/ground overcurrent and distance protection for the transmission line and realistic phase overcurrent protection for the switchgear. As you may know already, it’s practical to calculate 1LG bolted fault for overhead 115kV lines due to conductor gap distances and the way that the arc forms. The transmission line was a two source system and we simulated faults at different segments on the transmission line to get the worst-case condition. Similarly, we used 3LG bolted fault calculations for 34.5kV switchgear (radial feed) with a typical overcurrent protection.

We analyzed and compared the results for both the overhead 115kV transmission line systems as well as 34.5 kV switchgear --- compared varying short circuit current values, voltage magnitudes, conductor gap, 1LG vs 3LG, Fault Clearing times, etc. In our experience, we would say that that Terzija, EPRI, and Arc Pro had very reasonable results across the board. There were certainly some differences, but it was consistent. Overall, we think that anyone method would provide a reasonable HV Incident energy calculation.

One thing that distinguishes the ETAP ArcFault module is that we can use it for either a single bus or multi-bus system. For example, we were able to simulate faults on various segments of a HV Transmission line to get the worst-case incident energy for the entire line in one shot in a nicely formatted report. Furthermore, the HV ArcFault module is embedded in the native ETAP modeling environment. It was easy to perform HV Arc Flash Analysis for both HV, MV, and LV power system all in one model.

Hopefully, this was helpful for you…

Thanks,
AllumiaX Engineering

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