The HPS Centurion™ D1 dV/dT filter combines an inductor and parallel resistor network to mitigate both high frequency components and voltage spikes between the VFD and motor. The D1 can mitigate the effects of reflected wave voltages greater than what a reactor alone can accomplish. The D1 filter provides protection to the motor by slowing down the rate of voltage increase and minimizes the damaging peak voltages that occur within the motor’s windings and along the length of cables feeding the motor.