Wednesday, 8 January 2014

Some notes on HVDC

Advantage of ground retuyrn:

  • Earth resistance in case of dc for long lines is interdependent of length and this resistance is < that of metallic conductor if used.
  • d.c line can be built in two stages.
  • reliability increases in case of outage one monopolar out of the bipolar.

Disadvantages of  ground return:

  • Electrolytic erosion of buried / immersed metallic structure.
  • difficult design
  • Ground currents can cause dangerous step and touch voltages.
  • Ground current interferes with other services.

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