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would appreciate some help (verbiage) with an argument to replace my old 5kV MagneBlast breaker line-up with a new arc flash rated vacuum bottle line-up. breakers have been "sort of maintained" over their 35+ years - but the bus has really never been down for inspection/cleaning due to the...

apowerengr, thanks for the explanation. i think all 3 of your assumptions are correct about my setup. we are installing a new set of 5kV aux swgr (typical gen plant arrangement)and will certainly be using solid state relaying to cover the diffs. thanks again!

Can someone explain why a set of my transformer differential currents are passing through an auxilliary set of wye-delta CT's?

hey davidbeach, i probably deserved that. however, it always amazes me how "instruction" books can be so large and never tell me anything.

consider the following: two delta/wye transformers. primaries in parallel. secondaries feed independent loads. accidentally rolled two phases on the primary cables of one transformer when reconnecting. energized bot tx's with secondaries unloaded. blew primary fuse on feed to tx with rolled...

i need a cliff notes version of how to change the UV trip time delay on a 750. any takers?