MRI3-IHE Time Overcurrent/Earth Fault Current Relay with Harmonic Stabilizing

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Product code:
MRI3
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Documentation (Brochures & Manuals)

General HighTECH Line User Manual

The digitial multifunctional relay MRI3-IHE has been designed as a universal time overcurrent protection relay with evaluation of the 2nd harmonic for transformers.

The relay gives a complete thermal characteristic of the electrical equipment to be protected taking into account its initial load.

The MRI3-IHE furthermore provides a universal time-overcurrent and earth fault protection with the following functions:

  • Two-step overload protection with evaluation of the 2nd harmonic,

  • Display of the measured values for 1st and 2nd harmonic,

  • independent (Definite) time overcurrent relay,

  • inverse time overcurrent relay with selectable characteristics,

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

Benefits and Key Features

  • 19“ racks – fully withdrawable

  • Door mounting – withdrawable and sealable

  • Panel mounting – fully withdrawable

  • Fault / disturbance recorder

  • Intuitive HMI

  • Display (of primary values)

  • Easy setting software – Smart view

  • Compact form factor


Application

  • 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
Binary inputs 2
Current transformer inputs 4
Output relays 4
Watchdog relay 1
Protection ANSI
Time overcurrent protection 50/51
Inrush stabilisation (2nd harmonic)
Earth fault protection 50N/51N
Circuit breaker failure protection 50BF
Additional Features
Disturbance recorder
Fault recorder (none volatile)
Parameter sets 2
Communication
Modbus RTU (Option)
RS485 Open Data Protocol (Option)
Mounting Type
Housing is withdrawable
Housing suitable for door mounting
Housing suitable for mounting plate

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