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arcflashprimero
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Post subject: Relay modeling  Posted: Mon Jan 26, 2026 11:24 am |
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Joined: Thu Dec 18, 2025 3:21 pm
Posts: 7
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Do you model anything other than 50/51 settings for relays?
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bbaumer
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Post subject: Re: Relay modeling Posted: Tue Jan 27, 2026 4:24 am |
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Joined: Fri Jul 08, 2016 10:01 am
Posts: 461
Location: Indiana
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The CT ratio, curve type, any time delays or definite time setting and the breaker clearing time.
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SKM jockey for hire
PE in 17 states
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arcflashprimero
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Post subject: Re: Relay modeling Posted: Tue Jan 27, 2026 6:13 am |
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Joined: Thu Dec 18, 2025 3:21 pm
Posts: 7
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Thanks! What about upstream transformer differential protection and generator protection. Will these affect the arc flash calculations?
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bbaumer
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Post subject: Re: Relay modeling Posted: Tue Jan 27, 2026 7:12 am |
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Joined: Fri Jul 08, 2016 10:01 am
Posts: 461
Location: Indiana
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Just depends on what the settings are and what breaker or breakers they are controlling and what other protection downstream busses have or don't have. I do model them and include the settings for record if nothing else but it is possible that they will affect IE, again, just depends on the setup.
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SKM jockey for hire
PE in 17 states
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