Voltage Frequency Protection Relay

Frequency & Voltage Protection Relay

VFR

Voltage Frequency Protection Relay

The device has been designed for continuous monitoring of the system’s voltage, frequency and related variations. It is able to disconnect one or more loads in case of underfrequency (up to 7 stages) or frequency negative rate of change (up to 2 stages).


The VFR protects industrial and commercial power networks in case of voltage disturbances.

Automatic Load Shedding

Applications

  • Commercial, industrial and public utility

Digital Measurement

  • Phase and Line Voltages
  • Phase Sequence
  • Voltage Average
  • Voltage Unbalance
  • Voltage THD
  • Voltage Harmonics
  • Frequency (Hz)
  • Frequency variation (negative rate of change df/dt)

Signalling

  • Graphic LCD & LED based HMI
  • Indication of fault conditions
  • Indication of the relay status

Protection and Functionality

  • Under & Over Voltage
  • Frequency
  • dF/dT (up to 2 stages)
  • Phase Sequence
  • Underfrequency (up to 7 stages)
  • Overfrequency (up tp 3 stages)

Communication

  • RS485 port, Modbus RTU Protocol

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