Prysmian Group has developed and tested its new 700kV MI-PPL (mass impregnated) and 600kV extruded (XLPE) cable systems for high voltage direct current (HVDC) applications.

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The company said that it is the first time in the cable industry that voltages at such high levels have been achieved.

Prysmian Group energy projects senior vice president Massimo Battaini said: "These are also the first developments in cable technology that enable HVDC power transmission systems beyond 3 GW per cable bipole, and as such, are capable of more than double the power transmission capability of DC cable systems currently in service."

The cables will increase the power transmission capability by about 15% beyond the earlier highest voltage 525kV XLPE technology and beyond that currently achieved with 600kV PPL technology.

The achievements follow the company’s successful testing of the 525 kV DC XLPE and 525 kV P-Laser cable solutions in December 2015 and March 2016 respectively.

For the new voltage classes, Prysmian used its in-depth knowledge of materials and its understanding and ability to enhance manufacturing approach.

It will result in meeting the challenges of optimising reliable industrial processes with strict technological parameters and offering complete systems of cable and accessories with the best dielectric properties.

Prysmian operates in the businesses of underground and submarine cables and systems for power transmission and distribution, special cables for applications in several industries and medium as well as low voltage cables for the construction and infrastructure sectors.


Image: Prysmian Group demonstrates highest voltage transmission technology. Photo: Courtesy of Prysmian Group.