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  • Users: fx007
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  1. fx007

    Generator/Transformer Grounding - When does distance become an issue?

    Where is this part coming from: "3 pole seems to avoid some issues with potential floating neutrals but usually comes with the warning that having genset and transformer on same grounding system requires gensets to be close." I have had some training at ASCO and I never heard of this before. 3...
  2. fx007

    Voltage rise on transmission lines

    Where the load is too small, adding reactance can help mitigate reactive power and overvoltage at the receiving end. Otherwise, keeping generator voltages lower (for a small island system), can linearly reduce kVAr. Adding more load is real solution/or alternatively disconnecting it. Example...
  3. fx007

    Substation Fence Energization

    For substation fence induced voltage calc, there is an excellent manual and software by SES CDEGS. The manual also specifies limits as per IEEE and other standards. Find it, read it. Buy software to calculate. In your case, initial voltage of 6-10V referred to remote point is meaningless...
  4. fx007

    Specification of the silica gel used in Transformer Breather

    Just don't use the blue ones, since they are poisonous. The others are all fine. White ones that turn brownish are fine. Hope it helps....
  5. fx007

    Isolator Sizing as per IEC/NEC standards

    Per NEC, if your equipment manufacturer provide information for Disconnect Switch (read Isolator - same thing), you just use the manufacturer recommended size. Else, take FLA (full load amps) from the manufacturer's catalog x 1,15 and choose the next size up ( example, 472A, choose 600A). I used...
  6. fx007

    MV cables with LV cables

    There is not even minimal separation between 20kV and the control cables. If anything happens, your control equipment will fry :) Look up at the codes, I think the separation requirement is minimum 4-6 diamaters of the largest cable. Also, I hope the parallel running is not very long, because...
  7. fx007

    Cause of fault that's producing low current on one phase

    I could bet the neutral conductor from your transformer to the motor is too small. Pls check and let us know...
  8. fx007

    Cables installed in Ductbanks

    Just look at the diagram B4-3, page 372, I think you are misinterpreting the requirement. You are probably looking at Diagram B4-4, and applying your interpretation... Good luck.
  9. fx007

    fuse and conductor sizing

    Well, I am not sure that you can have them mixed and mashed by NEC connected to a single circuit. Good luck with AHJ.
  10. fx007

    fuse and conductor sizing

    OK, it was just a firewall. Here you go. Regardshttp://files.engineering.com/getfile.aspx?folder=b07b8661-b264-451f-839e-b40f4687f696&file=MECH_LOAD.pdf
  11. fx007

    fuse and conductor sizing

    You are welcome to use my calculation sheet. Please PM me your email so I can send it. I tried directly from here with 0 success. It's a PDF. 1. Amps for conductors - use NEC to find appropriate conductor for it. 2. C.B. should be sized by Total Amps (or a fuse). do not forget to multiply it...

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