MRU4 Voltage Protection (MRU4-2A0AAA)
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Configuration
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.
Functional Overview
Approvals
 | |
 | UL File Nr.: E217753 certified regarding UL508 (Industrial Controls) |
 | CSA File Nr.: 251990 certified regarding CSA-C22.2 No. 14 (Industrial Controls) |
 | EAC certified by EAC (Eurasian Conformity) |
 | KEMA Type tested (and certified) regarding IEC 60255‑1 and regarding IEC 61850 |
| Component certificate regarding the German grid code standard VDE-AR-N 4110 (2018-11) |
| Component certificate regarding the German grid code standard VDE-AR-N 4120 (2018-11) |
Complies with IEEE 1547‑2003
Amended by IEEE 1547a‑2014
Complies with ANSI C37.90‑2005
Complies with “Engineering Recommendation G99 Issue 1 Amendment 6 – March 2020”
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
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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:
Over-/Underfrequency supervision
Load shedding by ROCOF