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  • Users: tbyrne64
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  1. tbyrne64

    HP and KVA

    I work with several "old school" power engineers, all are very good utility engineers. Many use 1HP=1KVA for calculating ampacity. For instance; a 4160V plant bus has 6650HP worth of motors, they assume 6650Hp=6650KVA for estimating current. This omits motor eff, and power factor. Any...
  2. tbyrne64

    grounding substation Bollards

    Does anyone know if bollards in a eletric utility substation must be grounded. The Bollards are 4 inch diameter steel pipes filled with concrete, which are used as a protective barriers for equipment. There is an extensive ground grid in the sub to which the bollards are not currently...
  3. tbyrne64

    Power XFMR 100MVA xfmr fault current

    How do I determine the available fault current for a 100MVA xfmr base rating: 230KV delta/26KV wye with 7.5% impediance?

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