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I would be concerned about the waveform provided by the converter (also called inverter.) Xantrex in the size range below 3000 watt units are often "modified sine wave", which contains a lot of harmonics. In other words, not a pure sine wave. If the load is electronic in nature, as a strobe...

I have only seen one very high ampere cable installation similar to what you are considering. It was at a Dow Chemical plant in Texas. The engineering team had sought the services of a specialized engineering firm to do the cable arrangement, to assure load sharing betweent the cables and...

Thanks to DanDel for the reply. I would like to clarify that the 400 ampere x 20 to 40 seconds is for ONE transformer being energized... either a 33/12 kv utility interface (one of two) or a single area sub 12kv/480 (one of 20). In tests thus far, when a utility interface main transformer is...

Thanks RalphChristie for the reverences and summary. I will obtain the reference and review in detail over the next few weeks.

Thanks to all for the info so far. I checked out the audio download from DSTAR, which was helpful. I don't think we have classic ferroresonance in this case. It may be some kind of parallel resonance, and the possibility of utility side reactors or cap banks is the first to be investigated...

I went to school at U of Delaware. Reputation for Drexel is very good in that region. I do not have specifics, just an impression of quality.

Reply to the sound question: I have not heard it personally, but it has been described as "sustained inrush..." I have seen the oscillo of the event, which shows an initial offset for a few cycles, then sustained high symetrical current for the duration. So I interpret that the sound would be...

This is not a hoax (I posted it). The numbers are real, including the size. I know of several data centers that are this big, electrically speaking. I am new to this forum, so if I am not following protocol, I would appreciate any coaching you can give. I have not answered the replys thus...

Do you have any case studies or equipment solutions that might be effective on correction of a severe resonance initiated by transformer inrush? The application is a commercial data center with two incoming 20 mVA transformers 34.5 kV / 12 kV, and distribution network consisting of 20 area subs...