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DC System Riddle No.5 - HVDC electrode line
The "electrode line " , is insulated from metal transmission towers in HVDC Transmission . At earth potential , this electrode line  can have high voltage on it at  load conditions . I need this explained .

thank you
Author : donaldelectrician - From: usa
Sun, June 9th, 2013 - 14:06
It is related to HVDC system grounding requirements. Unlike grounding system of HVAC system, which are designed for fault condition, the HVDC grounding system are designed for normal, emergency and fault conditions. Since the HVDC system may operate in one of three operation modes,namely monopolar, bipolar and homopolar, its grounding system is required to provide an earth return circuit, permitingthe current to flow into the earth in a monopolar mode or other modes involving current discharge into the soil. Therefore an isolated grounding system to HVDC electrode line is nesseccery.

Author : Hamid - From: Iran
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