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  1. bshamad

    grounding vs lightning

    this is what i was thinking. thanks
  2. bshamad

    grounding vs lightning

    we are installing 130 kW motors on a roof top of cooling plant . these motors are fed from VFDs that are contained in MCC panel. We connected earthing cable (yellow/green) from the MCC earthing busbar to each motor body. should we connect the lightning grid on the roof to the motors. i am afraid...
  3. bshamad

    whats the moment of inertia of a 900 KW motor ?

    oh.. your right! i could see this under the time curve of the motor (Wk2 = 135 Lb-Ft2, friction torque = 478 Lb.Ft)! great ... now i can simulate starting this motor :)
  4. bshamad

    whats the moment of inertia of a 900 KW motor ?

    thanks for all,I went through data sheets of this motor, what i could find is the starting torque (LR torque), can i guess the MOI from that?
  5. bshamad

    whats the moment of inertia of a 900 KW motor ?

    while i was trying to simulate a 900 KW compressor motor using ETAP; i get stuck with the moment of inertia values for the motor, coupling, and compressor. does the starting torque of the motor give any indication about the motor moment of inertia? cheers.
  6. bshamad

    is this true?

    Ive used more than 100 meters cables between VFDs and Motors !
  7. bshamad

    heat dissipation of medium voltage switchgear

    hi, any idea where can i find tables that contain heat dissipation of MV S.Gs components (breakers, enclosure, busbars, CTs, VTs... etc? or is there any way to estimate that? cheers.

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