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Which is/are the configuration of the HVDC transmission line?
Monopolar link
Bipolar Link
Homopolar Link
All of these
All of these
HVDC (High Voltage Direct Current) transmission systems are broadly classified based on line configuration and polarity into Monopolar, Bipolar, and Homopolar links. Therefore, all the listed options are valid configurations of HVDC transmission systems.
CIGRETechnical Brochure 269 / CIGREWG 14.02
HVDC (High Voltage Direct Current) transmission systems are broadly classified based on line configuration and polarity into Monopolar, Bipolar, and Homopolar links. Therefore, all the listed options are valid configurations of HVDC transmission systems.
PDCтАЛ=VDCтАЛ├ЧIDCтАЛ тАФ Power transmitted in a single-pole HVDC link
PBipolarтАЛ=2├ЧVDCтАЛ├ЧIDCтАЛ тАФ Total transmitted power capacity in a bipolar HVDC link
In HVDC transmission, electric power is converted from AC to DC at a rectifier station, transmitted via DC lines, and converted back to AC at an inverter station. Depending on the system requirements for reliability, power capacity, and ground current flow, single-pole (monopolar), double-opposite-polarity pole (bipolar), or double-same-polarity pole (homopolar) conductor arrangements are utilized.
Monopolar Link: Uses a single conductor (usually negative polarity to minimize radio interference and corona loss) with ground or metallic return.
Bipolar Link: Uses two conductors of opposite polarities (+V and -V); most commonly used for long-distance bulk power transmission.
Homopolar Link: Uses two or more conductors having the same polarity (usually negative) with ground return.
Bipolar systems offer 50% power transfer redundancy if one pole experiences a fault (acts as monopolar).
Homopolar systems suffer less corona loss and radio interference due to consistent negative polarity.
Monopolar ground return causes continuous earth current, leading to metallic pipe corrosion and electrode polarization.
Homopolar configurations require a high continuous ground current return path.
Monopolar Link: Subsea cable connections where ground/sea return is feasible.
Bipolar Link: Long-distance overhead bulk power transmission (e.g., Rihand-Dadri HVDC in India).
Negative polarity is standard for single-polarity lines to reduce corona effect losses and interference.
Options A, B, and C represent valid and recognized structural configurations of HVDC transmission lines.
D is correct тАФ Monopolar, Bipolar, and Homopolar links are all standard structural configurations utilized in HVDC transmission systems.
Always remember that Bipolar HVDC is the industry standard for long overhead lines due to continuous operation capability during single-pole outages.