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  1. Swgr-stuff

    BIL testing on already failed transformer

    Vter: thanks for your comment! any help is very appreciated! no there was not any acceptance test. We have basic production test reports on some units.. i would say for maybe 10% of them. I know that we can request to witness type or production test, we did it for some very specific projects...
  2. Swgr-stuff

    BIL testing on already failed transformer

    i managed to get a confirmation that all failure are turn-turn fault. in all cases, primary fusing blew (50% of the time 1 fuse, and 50% it is 2 fuses)
  3. Swgr-stuff

    BIL testing on already failed transformer

    cuky2000: thanks for your comments. in short, what we need to do is to prove in come way that there are something wrong with these units (from mfg "A"). i am fully aware that there are some system criteria (transient, VCB, strike, etc) that can cause this type of failure. But, as i previously...
  4. Swgr-stuff

    BIL testing on already failed transformer

    based on the little information we have, is there some test we could do the the new unit we have in hand? as well as one of the damaged units?
  5. Swgr-stuff

    BIL testing on already failed transformer

    thanks for the info all transformer were protected with 160A fuses (2 of them blown in each case), so i am guessing current was high, as these fuses have a high minimum breaking current.
  6. Swgr-stuff

    BIL testing on already failed transformer

    Davidbeach, we do not even have this information (just to tell you the level of support we are getting). one thing i forgot to mention, the 4.16kV network is resistance grounded (throu the NGR connected to the source transformer), limited to 15A or 25A (depending on mine site). So a phase to...
  7. Swgr-stuff

    BIL testing on already failed transformer

    Hi all, I’m newly registered to this forum. i have been consulting it from times to times in the past few years and i always found very interesting information. The reason of my recent registration is that my company is facing a huge problem. Let’s start by saying that we are a switchgear...

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