What Is CVT in Schneider' N, U, W, Rl Series?
Inside epoxy bushing of N, U, W and RL series, apart from the centre primary conductor, moulded two pieces of conducting mesh for voltage sensing purpose. In between these layers and the centre conductor is insulation medium so they are equivalent to capacitors of very small capacitance (Nano Farah). For this reason, the voltage measurement scheme is called CVT (Capacitive voltage transformer).
Figure 1. N series bushing with copper CVT screen