WoodWard SEG MRI3-I5E5D-M 5A 16-360v Protection Relay

WoodWard SEG MRI3I5R5DM Protection Relay 5A 16-360v 50/60Hz

New product out of manufacturer's box

Brand: WoodWard SEG

Model: MRI3-I5E5D-M

Digital multifunctional relay for overcurrent protection.

Introduction and application

The MRl3 multifunctional digital 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 MRI3 protection functions that are implemented in just one device are summarized below:

• Definite time (independent) overcurrent relay,

• inverse time overcurrent relay with selectable characteristics,

• integrated fault direction determination for application in double-fed lines or

mesh systems,

• two-element earth fault protection (low and high setting) with definite or inverse time

characteristics,

• integrated earth fault direction determination for application in power system networks

with isolated neutral earthing or with arc suppression coil (Peterson coil). (ER/XR relay type),

• integrated determination of earth short-circuit fault direction in systems with solid earthing

neutral point or in resistance-earthed systems (SR relay type).

Additionally, the MRI3 relay can be employed as a backup protection for distance and differential

protection relays.

A similar but simplified version of the IRI1 overcurrent relay with reduced functions, without display and

serial interface, is also available.

Features and characteristics

• Digital filtering of measured values using discrete Fourier analysis to suppress

high-frequency harmonics and DC components induced by faults or system operations,

• two parameter sets,

• selectable protection functions:

- definite time overcurrent relay and

- inverse time overcurrent relay,

• selectable inverse time characteristics according to IEC 255-4:

- Normal Inverse (Type A)

- Very Inverse (Type B)

- Extremely Inverse (Type C)

- Special characteristics,

• reset configuration for selectable inverse time characteristics,

• high-set overcurrent unit with instantaneous or definite time function,

• two-element overcurrent relay (low and high set) for phase and earth faults,

• directional feature for application in double-fed lines or mesh systems,

• selectable earth fault directional feature for isolated or compensated networks,

• sensitive earth fault current measurement with or without directional feature

(X and XR relay type),

• determination of earth short-circuit fault direction for systems with solidly or

resistance-earthed neutral point,

• numerical display of setting values, actual measured values and their active, reactive

components, memorized fault data, etc.,

• display of measurement values as primary quantities,

• extractable modules with automatic short-circuiting of C.T. inputs when modules are

withdrawn,

• blocking, e.g., of high-set element (e.g., for selective fault detection through lower

overcurrent protection units after unsuccessful AR),

• relay characteristic angle for selectable phase current directional feature,

• circuit breaker failure protection,

• storage of trip values and switch-off time (tCBFP) for 5 fault occurrences

(voltage fail-safe),

• recording of up to eight fault occurrences with time stamp,

• free assignment of output relays

• serial data exchange via RS485 interface possible; alternatively with

SEG RS485 Pro-Open Data Protocol or Modbus Protocol,

• indication suppression after an activation (LED flashes),

• display of date and time

Rated Current: 5A

Frequency: 50/60 Hz

DC Voltage: 16-360v

AC Voltage: 16-270v

Date 02/14/2023

Weight: 1,700

Measurements: 9x14x26

Locator: GP04CL103P4

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