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  1. WvH

    Soil resistivity vs moisture in earth grid design

    Hi, I need to design a substation's (88/11kV 3x45MVA) earth grid. My problem is that I live in a relatively dry country (South Africa) and that we have had quite a lot of rain during the last couple of weeks. Our dry months are during our winter (May - August) and early spring (September and...
  2. WvH

    Surge arrestors on long lines?

    Given surge arrestors (SA's) installed at the termination of long lines (>30km) at substations, is it necessary to install SA's somewhere along the line in a high lightning density area? E.g. a set of SA's for every 30km of line length?
  3. WvH

    Info required for VDG relay

    Hi, I have to interpret the test results of a VDG13 undervoltage relay and would like to know: 1) Does it operate on a Very Inverse curve like a CDG13 relay? 2) If so, how does the formula differs from 13.5*TM/(PSM-1)? 3) If not, what curve does it operate on? Waldo

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