Why did the circuit trip, causing the accident to escalate?
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This post was last edited by zhaohh3211 on 2010-10-20 at 16:47. In power supply companies, sometimes a fault occurs in one external circuit, which causes the protection device associated with that circuit on the corresponding distribution panel to trip. At the same time, it can also cause the protection devices of other circuits on other distribution panels that are not faulty to trip as well, thereby escalating the original fault. What is the reason for this?
There must be an issue with the setting of the protection threshold; it is unable to handle faults that occur outside its designated area, which leads to erroneous operations
Since a fault in the external circuit can cause voltage fluctuations in the internal network, each circuit within the internal network is equipped with protection to trigger a shutdown.
This post was last edited by zhaohh3211 on 2010-10-20 at 16:35. Its selectivity is poor; it needs to be reset and reverified.
This post was last edited by zhaohh3211 on 2010-10-20 at 16:46. I have also encountered this phenomenon; it seems to be due to voltage fluctuation protection taking effect.
I agree that the tripping of the other normally functioning circuits mentioned upstairs was also caused by voltage fluctuations. However, when it affects relay protection, it constitutes a false trip, that is, an operation that should not have occurred but did. It’s still the issue of protection setting values. The original poster and those who commented above can take a look at the protection action records for these accidentally activated circuits to see what type of protection mechanism caused the tripping. I think it’s more likely that the quick-break protection has activated!