Re: FUSE LINK HV
Is this transformer a 13.8kv 3ph pri. with a 220/110v 3ph 4w delta secondary with a lighting tap (somewhat unusual for a transformer of the kva)or a 13.8kv 1ph primary with a 120/240v 1ph 3w secondary ? Is it a liquid or drytype.
At 1000kva it is probably a 3ph transformer would be my guess.
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Off hand I would say your 13.8kv fla for a 3ph transformer is 42a, (Kva x 1000)/(1.73 x E)=I
and secondary current would be (1000 x 1000)/(1.73 x 240)= 2400a and a very high amperage which is difficult to handle.
If 1ph (Kva x 1000)/E=I
"Fuse links" are more often used with pole mount transformers with "fused cutouts. There a (2) types of fuse links, K-fast and T-slow. Liquid cooled pad mount transformers can also use fuses links (protective links) which a mounted in a bayonet style holder into the transformer tanks.
Then there are Current limiting and expulsion fuses that are mounted in a fuse holder that we are accustomed to seeing.
The secondary protection at 2400A is a big problem because of the extremely high current.
Also, fuse curves must be compared in the primary distribution system so that all coordinate as well a assuring that the primary fuse selected will coordinate with the secondary fuse selected. This will assure that all protection is coordinated with both fuse curves and the available fault current to assure that the fuse will clear a fault safely.
Bottom line? have a qualified person study the application and specify the components that should be applied. Also have a person who is qualified in working the high voltage and current components and their proper installation.
