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Downfall of Fault Current Limiters...

Downfall of Fault Current Limiters...

Downfall of Fault Current Limiters...

(OP)
Considering things like fault levels and the subsequent use of fault current limiters to combat high magnitudes I was wondering what issues does this introduce though?

Will having a big lump of resistance/reactance in the system will cause problems in the post-fault phase etc?!

This vaguely rings a bell with my past electrical theory, and it would be nice for somebody to confirm my suspicions.

Is there any other disadvantages of using FCL's in a system during fault scenarios?! Thought I would ask here before I carry out a 'googlefest'.


Many Thanks

RE: Downfall of Fault Current Limiters...

Quote:

Common system changes can result in raising the fault level that may exceed existing equipment rating:
•    Larger transformers result in higher fault-duty levels, forcing the replacement of existing buswork and switchgear not rated for the new fault duty.
•    Additional generation raises the fault duty throughout a system
•    Older but still operational equipment gradually becomes underrated through system growth; some equipment, such as transformers in underground vaults or cables, can be very expensive to replace
•    Customers request parallel services that enhance the reliability of their supply but raise the fault duty

Some of your questions are answered in the enclose links:

http://library.abb.com/GLOBAL/SCOT/scot235.nsf/VerityDisplay/D9CCBCCCAC3667F2C1256C2F005571B1/$File/L2302-E-.pdf

thread238-102217




RE: Downfall of Fault Current Limiters...

What type of fault current limiter are you talking about?

RE: Downfall of Fault Current Limiters...

One potential disadvantage of a fault limiter such as a reactor is that it may take a large current limiting fuse out of it's current limiting range. When this happens the fuse can let through significantly more energy because it takes longer to clear.

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