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...
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)
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...
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.
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...
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...
