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Three-phase voltage-sensitive relays

RNPP-302 Three-phase voltage and phase monitoring relay

The RNPP-302 voltage monitoring relay is designed for protection of three-phase loads against major type of mains faults

The RNPP-302 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 three-digit, seven segment display on the relay front panel allows to:

 

 

  • continuously indicate the actual circuit voltage;

 

  • indicate type of occurring fault;

 

  • view (visualize) settings of modes and parameters.

 

 

The menu allows the user to make the following settings:

 

 

  • mode of voltage indication for each phase;

 

  • mode of the relay reaction to the digital symbol for remote de-energizing;

 

  • type of relay;

 

  • method for setting the voltage deviation;

 

  • turn on/off the phase imbalance monitoring;

 

  • turn on/off the phase sequence order monitoring;

 

  • the starter unit terminals voltage monitoring;

 

  • type of measured voltage;

 

  • the maximum allowable voltage tripping threshold;

 

  • the minimum allowable voltage tripping threshold;

 

  • allowable phase imbalance threshold;

 

  • automatic re-closure delay time;

 

  • min voltage de-energize tripping delay time;

 

  • max voltage de-energize tripping delay time;

 

  • phase imbalance tripping delay time;

 

  • phase loss tripping delay time;

 

  • delay time for tripping upon a digital input fault alarm signal.

 

 

The device is equipped with an additional alarm relay with normally open contacts lead out.

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