Current Transformer Limits
Current Transformer Limits
(OP)
Can a 150:5 CT survive a 25-30kA fault current?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Current Transformer Limits
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RE: Current Transformer Limits
RE: Current Transformer Limits
RE: Current Transformer Limits
RE: Current Transformer Limits
Window-type or wound primary?
If medium voltage wound type, this answer is most probably no. Normal thermal rating is 100 x Inom, which would be 15 kA.
I assume most of the above comments are assuming a window-type CT or bushing CT. Remember even those have limits on how much current the secondary windings can take without damage...even if a short-time current. Considering your case above, for a 25 kA primary current, the secondary peak current could reach 833A (25 kA / 150/5). While the core would saturate well below that level more than likely, the saturation point is a function of the connected burden. If the burden was electronic and the leads relatively short, then the secondary current could get pretty high and could indeed cause damage.
RE: Current Transformer Limits
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RE: Current Transformer Limits
Yes...the manufacturer should be able to tell you.
Also, there should be a thermal and dynamic current rating marked on the nameplate.
RE: Current Transformer Limits
RE: Current Transformer Limits
I think you're talking about the accuracy of a CT, i.e. C800 or 5P20 rating and it is related to burden.
The ability of a CT to physically handle (handle meaning without damage) is not related to the applied burden and is really only a function of the cross-sectional area of the windings used in the primary and secondary and the mechanical design of such.