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  1. toto2002

    Undreground connection for 3000 Amp @ 4160 V

    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...
  2. toto2002

    ROBICON VFD Grounding faults

    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...

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