Radisson Grounding Electrode

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A ground electrode is typically a large metal ring about 300 - 800 metres in diameter buried approximately three metres
in the ground and surrounded by a highly conductive bed of coke. The electrode provides grounding of the HVdc system to the earth when slight imbalances of current occur between the bipole lines. The electrode also acts as a ground return system that can be used during system outages. There are currently three ground electrode sites operating in Manitoba that help ensure reliable functioning of Bipoles I and II. These are associated with the two northern facilities (Radisson and Henday Converter Stations) and one southern
facility (Dorsey Converter Station) located 12 miles north of Rosser. The existing ground electrodes have been functioning successfully and without incident for up to 40 years. The Keewatinoow and Riel Converter Stations will each require ground electrodes similar to the existing facilities. The ground electrodes must be located away from the converter station and on a site of one square mile. A low voltage feeder line is needed to connect the ground electrode to the converter station. The low voltage feeder line is similar to a standard distribution line that can be seen along many Manitoba roadways. Precise routing of the feeder line is to be determined.

www.hydro.mb.ca/projects/bipoleIII/pdfs/ground_electrod...