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  • Users: JFG
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  1. JFG

    Secondary Transformer Feeder Taps & Circuit Protection NEC240-21(c4)

    Within a utility substation, 40MW of distributed generation is presently being installed. A station service transformer for this generator addition (3-phase, 12,470-480V, 1500KVA, wye primary and delta secondary) has three individual feeder loads tapped directly from the secondary to power...
  2. JFG

    Soil Thermal Resitivity

    I inquiry on a situtation that I am analyzing for 15kv power cable placed in a trench system. To obtain the cables highest ampacity, it is required to surround the cables with a sand, or other soil material, that has a very good soil thermal resistivity to allow cable heat disipation, (ie...
  3. JFG

    Trefoil Conductor Arrangment

    What are the pros and cons of the use of a "trefoil" conductor arrangement in substation cable trench?

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