Advantage of ground retuyrn:
Disadvantages of ground return:
- 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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