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Recent content by ColinSp

  1. ColinSp

    Buchholz relay testing calculation

    When testing a transformer buchholz oil surge relay, what is the calculation for volume / pressure of air blast to operate the trip element?
  2. ColinSp

    Step Potential Higher than Touch Potential ?

    When an earth fault current flows back to a transformer neutral it passes through the mass of earth. The resistance of the earth path will depent on the soil composition, resistivity etc. The resistivity of the soil will be proportional to the area. As the earth path nears the transformer...
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