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| Relay modeling https://brainfiller.com/arcflashforum/viewtopic.php?f=4&t=6394 |
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| Author: | arcflashprimero [ Mon Jan 26, 2026 11:24 am ] |
| Post subject: | Relay modeling |
Do you model anything other than 50/51 settings for relays? |
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| Author: | bbaumer [ Tue Jan 27, 2026 4:24 am ] |
| Post subject: | Re: Relay modeling |
The CT ratio, curve type, any time delays or definite time setting and the breaker clearing time. |
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| Author: | arcflashprimero [ Tue Jan 27, 2026 6:13 am ] |
| Post subject: | Re: Relay modeling |
Thanks! What about upstream transformer differential protection and generator protection. Will these affect the arc flash calculations? |
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| Author: | bbaumer [ Tue Jan 27, 2026 7:12 am ] |
| Post subject: | Re: Relay modeling |
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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