MRU4 Voltage Protection
The MRU4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective functions and is very easy to operate.
It is designed to protect electrical equipment from dangerous voltage fluctuations.
For example protection against under voltages caused by mains shortcircuits, or overvoltages due to load shedding or failure of a generator voltage controller.
Its compact design makes the MRU4 ideal for installation within the LV terminal compartments of compact SF6-insulated MV systems.
The protection functions of the MRU4 have been adapted to comply with the requirements of the VDE-AR-N-4110:2018.
Wide range power supply: 24 … 270 VDC / 48 … 230 VAC
VT measurement from 0 V up to 800 VAC
Plausibility verification intelligence
Optimized functional overview by hiding unused functions, parameter and assignments
On-board testing without removing the wiring
Interconnection of renewable energies (DER – distributed energy resources) to the public grid.
Over- / Undervoltage protection.
Protection of High, Medium and Low Voltage feeders against overvoltage (insulation damage) and undervoltage.
Frequency based protection option, examples:
Load shedding by ROCOF