Coordination Studies - Preview to the On-Demand Class
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- Опубліковано 10 лют 2025
- Preview Jim Phillips' on demand class about Coordination Studies. Jim provides a peak into a few of the topics that are covered. brainfiller.co...
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A coordination study, sometimes known as protective device coordination analysis, protection study and similar terms, is an “attempt” to select and set devices to minimize the extent of an outage when a fault or overload occurs. Ideally only the device closest to the fault should operate and clear with the other devices remaining closed. This minimizes the extent of the outage.
As Jim states, perfect coordination is almost impossible to achieve but you can greatly improve it by making appropriate compromises with selectivity to optimize coordination for the overall system.
Understanding coordination and protective devices time current curves is also an important part in defining the arc duration for an arc flash study.
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Nice
I work for a 3rd party testing company. I did infrared scans today and the electrician opening up the equipment for me dropped the cover onto the lugs inside the transformer and it tripped the panel feeding it. It also tripped the main breaker in the main electrical room. Why did a feeder panel trip the main?
Could be a couple of reasons.
1) Did the main have ground fault protection? Sometimes if it is ground fault, depending on the settings, the main may trip in addition to the feeder.
2) Higher magnitude faults can cause the instantaneous of overcurrent devices to trip. So it is possible that the current caused the feeder and the main to trip. To be sure, that would require reviewing the devices and the respective time current curves. Thanks for your comment.
3) I hope no one was hurt. That could have been disastrous.
4) NFPA 70E provides much needed guidance for safe work practices.
Thanks for your comment!
@Brainfiller thanks for responding.
Thankfully, no one was injured.
As for the main breaker, I'm pretty sure it has ground fault. And that would make sense because it was more of a ground fault than a short circuit.