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  • Users: vandax
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  1. vandax

    Sensitive ground fault

    Hi Does anyone has experience with application of sensitive ground fault relay in the distribution line. We just have an experienced that the neutral relay is not detect the fault (broken of 1 phase wire and lay down on the ground) in 13.8 kV distribution line (20 ohm grounded system)...
  2. vandax

    Permissible loading for transformer

    We have been operating 90/150(FOA) MVA transformer for 230/115 kV for 3 years. I have no accurare refference, how many % the transformer can be loaded exceed its maximum capacity? The fact that..sometimes we loaded it 125% of maximum cap for a 15-20 menutes due to operation need. Present...
  3. vandax

    Impact loosing 1 phase of 3 phase to motor

    Hi. We have experienced with loose connection of 1 phase in 3 phases 13.8 kV system, and caused several motors/load damaged. Since the loose connection occurred at branch line (15-25 A) of 300 A feeder's load, the recloser/51N at feeder would not pickup & operated. I need your help on analyze...
  4. vandax

    Asking the different of rod and pipe for grounding

    Dear friends, have you discussed the different of using ground rod & ground well/pipe for the size/diameter? I have search to standard, there is no mention the formula of using pipe, almost all of reference just mention to use cooper rod, plate, ring.. My opinition, as skin effect that the...
  5. vandax

    Earthing lightning arrester

    Dear friends, please advice regarding method of earthing LA at distribution line. In our current practice 13.8 kV line with using pipe pole, the LA is always earthed to gound via pole (brazed), but our new study shown that the earthing of LA must be via a special wire to reduce impact of surge...

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