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Good People, Thanks for all of your valuable input, which I will consider when I design similar installation with less spacial constraints. I hope this will not be soon. Let me tell you how I solved my problem, as of yesterday: 1/ As mentioned before I will need the full ampacity of the...

Thanks guys for the response. Let me expand a little on my problem. This is a dual ended configuration. Under normal conditions each section of the bus and the associated feeder will carry about 1200 amps. Under emergency conditions, which would be loss of one of the supply sources, the total...

How is it possible to have single phase transformers with different ratings, working in paralel on the same buss !? Can you sketch a one line? From the info provided it seems that the problem is much bigger than sizing the fuse. Other than that I totaly aggree with tinfoil, particularly with...

Good people, Does anybody know of a practical way how to bring 2500 Amps @ 4160 V underground connection to MV Switchgear ?!!?! My problem is that after applying the ampacitis from NEC Table 310.77 Detail 3, the net result is about 7 circuits of 750 KCM. And here starts the problem: I can...

Thanks all for the responses. One thing I forgot to mention is that this capacitor problem occurs not very frequently ( like once in every 2-3 months). It happens when the motor is starting. The cpacitors are the ones that Robicon supplied. I am pretty sure that there is some voltage spike...

Hi everybody, A client of mine has Robicon VFD of the Perfect Harmony Series (PWM) 3000 V, powering 800 Hp, squirel cage star connected motor. In each phase Robicon uses a complicated combination of 5 phase-shifting transformers (delta secondary 480 V), each connected to 6 pulse rectifier...