The Offshore Renewable Energy (ORE) Catapult has upgraded the adjustable high voltage (HV) reactor at its UKAS accredited HV electrical laboratory, paving the way for an industry shift from 33 kV to 66 kV for future offshore wind inter-array electrical systems.
The upgrade to the adjustable HV reactor involved introducing an automated control system and increasing the power rating of the 600 kV resonant transformer, in collaboration with Doble PowerTest, to 150 kW of power.
This now means that the reactor has both the required high voltage and power capacity to carry out automated step-breakdown testing of 66 kV cable systems using water terminations.
“This upgrade represents a significant step-up for the HV laboratory, allowing the business to provide a unique service to the market. This new service enables the cost-effective development of new technology and complements the accelerated lifetime test work that we have developed with our clients to fast-track their product’s development and availability,” Alex Neumann, Asset & Business Development Manager, ORE Catapult, said.
ORE Catapult’s HV electrical test laboratory is capable of exerting up to twenty times the operating stresses on the cable. This type of Highly Accelerated Lifetime Test (HALT) is used to instigate breakdown across the cable insulation, enabling the qualification of new wet-type cable systems and the assessment of the degradation of cable insulation systems.
ORE Catapult says that stepping up array systems in offshore wind farms to 66 kV will enable increased offshore power density, lower operational losses, fewer offshore collector substations and the resulting reduction in the levelised cost of energy. The move is also seen as essential for the development of larger offshore wind power farms which will use larger capacity offshore wind turbines.
“This enhancement has played a significant role in supporting our development programme, allowing us to better predict the expected lifetime of the power cable, as well as validate and qualify its design. This capability will allow us to move to 66kV inter-array power supply which is a key driver to ensuring future offshore renewable energy development is cost-effective and reliable,” Jeremy Featherstone, Product Development Director, JDR Cables, said.