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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