Wednesday, 31 October 2012


Advantages of neutral grounding:

  • Voltage of phases are limited to phase to ground voltage.
  • High voltages due to arcing grounds or transient line-ground faults are eliminated.
  • Sensitive protective relays against LG faults can be used.
  • Overvoltages due to lightening are discharged to ground.
Advantages of isolated neutral

  • It is possible to maintain supply with fault on line.
  • Interference with communication lines is reduced because of no Z sequence current.
Effective grounding systems:

X0 / X1 < 3

Least Expensive is = maxm Vphase= 0.8 V line

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