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RNPP-301

RNPP-301
2-3 days

The RNPP-301 voltage monitoring relay is designed for protection of three-phase loads against major types of main faults.

  • RMS voltage reaching beyond admissible thresolds
  • phase sequence order violation and phase coincidence
  • violation of the mains voltage phase completness and symmetry
The device performs monitoring main circuit parameters and de-energizes load when the parameters fall beyond specified boundaries. The front panel LEDs display following:

  • presence of voltage in the mains
  • load status
  • type fault
Adjustment potentiometers allow setting:

  • tripping thresold for the minimum/the maximum voltage
  • time delay for load re-energizing after circuit parameters recovery
  • tripping time delay for load de-energizing in case of all circuit voltage faults
With switches on the device's front panel user can select the type of circuit monitored 380V / 400V and turn on/off monitoring of the following circuit paremeters:

  • phase sequence and phase coincidence
  • mains voltage phase completeness and symmetry
  • voltage drop
  • voltage surge
Corresponding combinations of the RNPP-311M switches allow for functioning in various modes:

  • mode of circuit voltage comprehensive monitoring
  • minimum/the maximum voltage monitoring mode
  • phase presence monitoring mode
  • phase sequence violation and phase  coincidence monitoring mode
  • phase imbalance monitoring mode
The phase availability monitoring function is maintained in any position of the switches, including OFF position. The feature of 24V online power supply is available (optional, to be ordered separately)

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