Voltage Relay VR-50

Voltage Relay VR-50 is a numerical multifunctional relay for monitoring busbars in low voltage or medium voltage grids. If the VR-50 detects a deviation of the voltage from the set values in accordance with the selected protection functions, it performs the signalling and / or tripp signal to shutdown the plant. The VR-50 Voltage Relay is used to protect and monitor the generator, transformer or the renewable power sources connection to the grid. The relay can achieve undervoltage and / or overvoltage protection, underfrequency and / or overfrequency protection. The VR-50 enables selecting of an additional vector shift detection function for preventing the islanding operation of a renewable power source.

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  • undervoltage and / or overvoltage protection
  • underfrequency and / or overfrequency protection
  • vector shift detection function for preventing the islanding operation of a renewable power source
  • numerical signal processing
  • galvanically separated measuring inputs and inputs from the power supply
  • high accuracy of measurement (true RMS)
  • time registration up to hundred events
  • microprocessor processing of measured quantities
  • RS485 or optical communication with the master system
  • alphanumeric LCD with 2×8 digits and backlight for display of measured and registered quantities and parameters
  • self-test function, local and remote signalling of availability
  • protection signalling with bi-color LED elements (8 programmable LED elements)
  • five programmable semiconductor outputs for signalling
  • two digital inputs
  • four programmable relay outputs
  • small dimensions, mounting on the TS35 rail

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