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  1. tefc

    Generator reactance tolerances

    jbartos, kevd, thanks for your replies. jbartos, my concern is I don't have the American Standards defining the applicable tolerance on the expected value of the direct-axis subtransient reactance (I assumed it was ANSI C50.10, but maybe I'm wrong). As suggested buy kevd, I've used the IEC...
  2. tefc

    Generator reactance tolerances

    Hello, I'm currently performing a short circuit study. For this calculations, the generators direct-axis subtransient reactance is required. At this stage, I know the expected value of this reactance (unsaturated & saturated value), however I've also to apply tolerance according to ANSI C50.10...
  3. tefc

    Computer aided cable sizing software

    Hello, I'm looking for a software for sizing cables and conductor according to American Standards (not IEC). Following items shall be considered : - System voltage, - Circuit voltage drop, - Short-circuit time-current curves, - Ampacity rating of cable in free air, underground duct banks, above...
  4. tefc

    Advantage of grounded Y primary for utility

    cuky2000, prc, many thanks for your replies. However, if you agree, I would like to get more informations about the following points. 1/I understand that Y at primary side make no sense if the utility 132 KV system is an ungrounded system. I suppose the utility will see only an unbalanced...
  5. tefc

    Advantage of grounded Y primary for utility

    Hi, I’ve be involved in the past on a project with an electrical system transmission on 132kV and distribution on 33kV, with both 132kV and 33kV earthed. We used 2 transformers with the following vector group : Star in 132kV side and Delta on the 33kV side (YNd1)with earthing transformers...

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