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Hvc Essay

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Advantages and Limitations of HVDC and HVAC Transmission System in the Environment.

1. Effect of Electric Fields
The electric field generated by the HVDC transmission line is a mixture of electrostatic field created by the line voltage and the field of space charge because the charge generated by corona line. Study of environmental influence of the electric field around the HVDC transmission line is occur in Canada and Russia have shown that discomfort to people who usually felt under the HVAC transmission line is not observed under HVDC line. This discomfort ascends from the release of the human spark to shrubs, grasses, and other plants. Although emissions also happen under the influence of an electric field of HVDC transmission line, the disposal is quite rare in contrast to emissions caused by rise HVAC transmission lines, which may amount to 100 departures per second. Subjective, the sensations felt by humans standing under HVDC overhead lines usually do not go beyond electrostatic stimulation of hair on the head of the movement. Such results suggest that the electrostatic field under HVDC transmission lines is limited and generally not harmful to humans. A study in Canada found …show more content…

Then the result is, HVDC online radio interference produced only by positive charged of conductor, while the HVAC interference produce by the three-phase AC. Weather the conditions have an adverse impact on online radio interference due to AC and DC. AC line contributes up (decibels) 10 dB improvement in radio interference in the rain, while online radio interference DC decreases during the rainy day. DC radio interference level may be limited to an acceptable level by limiting the electric field gradient to around 64 kV / inch. The level of radio interference from HVDC line is usually 6-8 dB lower than HVAC lines with the same

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