RNPP-311-1 two-channel voltage relay
RNPP-311-1 two-channel voltage relay is a modification of the standard RNPP-311 relay. It performs all functions of voltage control inherent in RNPP-311 and additionally controls the mains frequency.
It is designed for turning off the load of 380 V / 50 Hz at:
- unacceptable voltage fluctuations with a minimum of 0.02 s, amplitude symmetry violation of voltage (voltage imbalance), phase interruption and violation of phase sequence, phase coincidence (channel U);
- unacceptable increase / decrease of mains frequency (channel f).