Medium and high-voltage cables are tested at Riihimäki in a new, modern high-voltage testing room.
A voltage test is carried out on the length of each drum in order to verify its insulating strength and the cable’s integrity. In monitoring the quality of insulation, a partial discharge measurement is made, which ensures that the cable’s insulation is homogeneous and that the electric field is evenly distributed.
The voltages tested in the high-voltage testing room go all the way up to 230kV. In the shielded testing room, partial discharge measurements can be performed on cables with a required level of less than 2pC.