MRI1-IE Time overcurrent relay with Multi-Characteristic
The MRl1 digital multifunctional relay is a universal time overcurrent and earth fault protection device intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for networks with a solidly earthed/resistance-earthed neutral point.
The protective functions of MRI1 which are implemented in only one device are summarized as follows:
Independent (Definite) time overcurrent relay.
Inverse time overcurrent relay with selectable characteristics.
Integrated determination of fault direction for application to doubly infeeded lines or meshed systems.
Two-element (low and high set) earth fault protection with definite or inverse time characteristics.
Integrated determination of earth fault direction for application to power system networks with isolated or arc suppressing coil (Peterson coil) neutral earthing. (ER/XR-relay type).
Integrated determination of earth short-circuit fault direction in systems with solidly-earthed neutral point or in resistance-earthed systems (SR-relay type).
Furthermore, the relay MRI1 can be employed as a back-up protection for distance and differential protective relays.
Benefits and Key Features
19“ racks – fully withdrawable
Door mounting – withdrawable and sealable
Panel mounting – fully withdrawable
Fault / disturbance recorder
Display (of primary values)
Easy setting software – Smart view
Compact form factor
Interconnection of renewable energies (DER – distributed energy resources) to the public grid.
Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.
|Inputs and Outputs|
|Current transformer inputs||4|
|Time overcurrent protection||50/51||•|
|Earth fault protection||50N/51N||•|
|Circuit breaker failure protection||50BF||•|
|Fault recorder (none volatile)||•|
|RS485 Open Data Protocol||(Option)|
|Housing is withdrawable||•|
|Housing suitable for door mounting||•|
|Housing suitable for mounting plate||•|