High-voltage Testing Laboratory

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 reel 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 230 kV. In the shielded testing room, partial discharge measurements can be performed on cables from which a level of less than 2pC is required to be reached.