transmission line, giving more strength and credibility to the Energy source converters (HVDC-VSC), with an estimated length of km from. The HVDC Itaipu is a High-voltage direct current overhead line transmission system in Brazil from the Itaipu hydroelectric power plant to the region of São Paulo. A high-voltage, direct current (HVDC) electric power transmission system uses direct current for the bulk.

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It is unusual, having more than two converter stations as part of a single HVDC system, and as of is one of only two Multi-terminal HVDC systems in operation in the world the other multi-terminal scheme being the Quebec — New England Transmission system linking northeastern United States with Trasmision in Canada. The overhead lines and submarine cables are duplicated, with both circuits being installed on the same towers.

Cahora Bassa (HVDC) – Wikipedia

When originally completed in by English Electricthe scheme comprised two converter stations, at San Dalmazio in Tuscany on the Italian mainland, which was situated close to a production area and offered a connection to two kV-lines, and Codrongianos on Sardinia. Each 6-pulse converter bridge consisted of 6 main Tarnsmision valves plus a 7th for high-speed bypass operations.

The original scheme was commissioned during and put into commercial operation in January The mercury arc valves were as well in San Dalmazio as in Codrongianus situated in a hall with a length of 60 metres, a width of 20 metres and a height of 15 metres. The valves are still in these halls, however the mercury was removed, after the decomissioning of the mercury arc system in The scheme consists of three overhead line sections: In addition to this, there are two submarine cable sections: The ttransmision was designed to export power from coal-fired power stations on Sardinia to the Italian mainland, and thus was only required to operate in one direction.


Sistemas de transmisión de alta tensión en corriente continua (HDVC)

Although the converter stations are inherently capable of operating in either direction of power transmission, advantage was taken of the unidirectional power-flow requirement to economise on the design of the sea electrodes. The sea return current enters the sea at the Sardinian end Anode and leaves the sea at the mainland end Cathode. The mainland electrode consists of bare copper a section of insulated copper cable with the insulation stripped offwhich would corrode rapidly trannsmision used as an anode but suffers no degradation when used as a cathode.

However, the anode electrode on Sardinia required a more sophisticated design using platinum-coated titanium pipe, subdivided into 30 sub-electrodes, in order to prevent corrosion. Unlike the two original converters, the Lucciana converter station was built with air-insulated, air-cooled Thyristor valves, supplied by CGE Alstom.

High-voltage direct current

In the mercury arc converters at Trannsmision and San Dalmazio were decommissioned and two new converters stations were built, using air-cooled, air-insulated thyristor valves similar to those supplied for the connection at Lucciana.


At the Sardinian end, the new converter station transmosion built next to the existing station but at the mainland end a new converter station was built at Suveretoas this site offered in opposite to San Dalmazio an interconnection to the kV grid. It will also operate with a voltage of kV.

While the overhead lines can be used without modification, the underground and subsea cables have to be replaced for the higher transmission rate. Also two new connverters will be built at the existing sites in Suvereto and Codrongianos.

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