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Recent content by tariro

  1. tariro

    per unit impedance values of a transformer

    how do you calculate the per unit impedance value of a transformer given the percentage impedance value? How do you also estimate the per unit vales of resistance and reactance from the percentage impedance value?
  2. tariro

    DC testing voltages

    these cables have more than 20 years in service and are PILC
  3. tariro

    DC testing voltages

    When doing DC hipot tests, what value of a DC voltage do you use relative to the rated voltage of a cable? Like for 11kV rated cables (AC) what value of DC voltage can i use? What does the BS standard say about this?
  4. tariro

    Feeder protection

    what is the difference between solkor and differential protection on feeders
  5. tariro

    transmission lines

    What causes sparks when one opens an isolator of a line that is not loaded
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