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Three-phase voltage-sensitive relays

RNPP-301 Three-phase voltage and phase monitoring relay

The RNPP-301 voltage monitoring relay is designed for protection of three-phase loads against major type of mains faults

The RNPP-301 voltage monitoring relay is designed for protection of three-phase loads against major type of mains faults, as:

 

 

  • RMS voltage reaching beyond admissible thresholds;

 

  • phase sequence order violation and phase coincidence;

 

  • violation of the mains voltage phase completeness and symmetry.

 

 

The device performs monitoring the main circuit parameters and de-energizes load when the parameters fall beyond specified boundaries. The relay also tracks the status of magnetic starter power contacts at no-load and under load while monitoring their operability (burning or sticking).

 

 

The front panel LEDs display the following:

 

 

  • presence of voltage in the mains;

 

  • load status (ON/OFF);

 

  • type of fault.

 

 

Six variable pot knobs on the front panel allow for setting:

 

 

  • the maximum allowable voltage tripping threshold;

 

  • the minimum allowable voltage tripping threshold;

 

  • allowable phase imbalance threshold;

 

  • tripping time delay for load de-energizing in case of emergency voltage reduction;

 

  • tripping time delay for load de-energizing in case of other circuit faults;

 

  • time delay for load re-energizing after the circuit parameters recovery.

 

 

The device can function a phase- or line- voltage monitor (user-selected).

 

 

Three modifications of this device are currently produced.

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