| 1. | Mercury arc valves for HVDC were rugged but required high maintenance.
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| 2. | Mercury arc valves were also used on the following HVDC projects:
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| 3. | The mercury arc valves of Pole 2 were replaced later by Siemens.
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| 4. | The original link used mercury arc valve converters, and was rated at.
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| 5. | In 1977 one mercury arc valve group was replaced by a thyristor valve group.
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| 6. | See HVDC # Mercury arc valves.
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| 7. | Consequently, converters built with mercury arc valves are known as line-commutated converters ( LCC ).
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| 8. | The mercury arc valves were decommissioned on 1 August 2012, ahead of commissioning of replacement thyristor converters.
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| 9. | The mercury arc valve current-voltage characteristics are highly dependent on the temperature of the liquid mercury.
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| 10. | Mercury arc valves require an external circuit to force the current to zero and thus turn off the valve.
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