Submarine cables with a lead sheath and steel amour are
used for connecting an offshore wind farm to a on shore grid,
either oil-insulated cables or PEX-insulated cables can be
used. The reactive power produced by the submarine cable of
connecting an offshore wind farm could be very high, a 40 km
long cable at 150 kV would produce around 100 Mvar [9],
reactors will be needed to compensate the reactive power
produced by the cable.