MRA4 Directional Feeder Protection
The MRA4 is a high precision and reliable protection and control relay. The intuitive setting concept with plausibility test enables reliable and time optimized configuration of the extensive protection function to a variety of applications such as incoming or outgoing feeder protection, network protection and generator protection.
In fact, the MRA4 is our interconnection and mains decoupling expert.
The implemented switchgear management guaranties an efficient and safe control and supervision.
The device is a bench mark in flexibility and usability and offers various communication options. The hardware is designed for all nominal values in combination with protection and control functionality.
The parameterizing and analyzing software Smart view is usable for each HighPROTEC device and free of charge.
UL File Nr.: E217753
certified regarding UL508 (Industrial Controls)
CSA File Nr.: 251990
certified regarding CSA-C22.2 No. 14 (Industrial Controls)
certified by EAC (Eurasian Conformity)
Type tested (and certified) regarding IEC 60255‑1 and regarding IEC 61850
동일성 선언서 (Declaration of Identity)
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”
Key Benefits of the HighPROTEC MRA4
Wide range power supply: 24 … 270 VDC / 48 … 230 VAC
VT measurement from 0 V up to 800 VAC (300 VAC for some order options)
CT measurement always with 1 A and 5 A
Plausibility verification intelligence
Optimized functional overview by hiding unused functions, parameter and assignments
On-board testing without removing the wiring
Menu Languages supported: English, German, Spanish, Portuguese, French, Russian, Polish, Romanian
Interconnection of renewable energies (DER – distributed energy resources) to the public grid.
Over- / Undervoltage protection.
Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.
Protection of High, Medium and Low Voltage feeders against overvoltage (insulation damage) and undervoltage.
Frequency based protection option, examples:
Load shedding by ROCOF
Auto reclosure option to fix short duration faults (like bird flying through overhead lines, ice on lines, lightning’s hitting overhead lines, wind caused arcing by on overhead lines.
|Inputs and Outputs|
|Analog inputs||0 (2)|
|Analog outputs||0 (2)|
|Binary inputs||8 (24)|
|Current transformer inputs||4|
|Output relays||6 (19)|
|Voltage transformer inputs||4|
|Time overcurrent protection||50/51||•|
|Inrush stabilisation (2nd harmonic)||•|
|Directional time overcurrent protection||67||•|
|Earth fault protection||50N/51N||•|
|Sensitive EF isolated/compensated||50Ns/51Ns||(Option)|
|Resistance earthed / solidly earthed||50N/51N||•|
|Earth fault directional feature||67N||•|
|Circuit breaker failure protection||50BF||•|
|Vector surge / mains decoupling||78V||•|
|Negative sequence protection||46||•|
|Auto reclosing AR||79||•|
|Current transformer supervision||60L||•|
|Voltage transformer supervision||60FL||•|
|Trip circuit resp. control circuit supervision||74TC||•|
|Control and detection of switchgears||•|
|Control and supervision of a circuit breaker||•|
|Fault recorder (none volatile)||•|
|Housing suitable for 19” rack mounting||(Option)|
|Housing suitable for door mounting||•|