XLPE Cable for HVDC Link

Abstract

The cross-linked polyethylene (XLPE) cable has been used for DC transmission lines. We have been developing the DC XLPE cable for a few decades, and proved its quality and reliability through the research and development process. In 2012, we delivered the 250 kV DC cable, making it the world’s highest voltage DC XLPE cable at that time and the world’s first one to be applied to a line commutated converter system. Following the project, we has recently completed the construction of a 400 kV HVDC XLPE cable system, the highest voltage in the world for an HVDC-XLPE cable system, for NEMO Link, which connects the UK and Belgium. We has also completed construction of the new HVDC Link with 250 kV HVDC XLPE cable, which increases transmission capacity between Honshu and Hokkaido in Japan. The route length of this HVDC cable system is the longest in the world for an inter-strait tunnel. These DC XLPE cable has an allowable continuous conductor temperature of 90 degrees Celsius and withstands polarity reversal of voltage. This cable will meet the various needs of DC transmission that are expected to increase in the future.