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Three-phase voltage-sensitive relays

RNPP-311-1 two-channel voltage relay

RNPP-311-1 two-channel voltage relay is a modification of the standard RNPP-311 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).

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