MRG3-IE Generator Protection Device

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Documentation (Brochures & Manuals)

General HighTECH Line User Manual

The MRG3-IE is a universal mains decoupling device that covers all protection functions which are required by utilities for the mains parallel operation of power stations such as:

  • over/and under voltage protection,

  • over/and under frequency protection,

  • extremely fast generator mains decoupling in case of vector surges or rate of change of frequency df/dt

The MRG3 can furthermore be equipped with a multi-purpose over current time and earth fault protection relay and it has been designed as to be also used for grids with isolated and compensated star points respectively. It is applicable for the mains parallel operation of power generating gensets and includes the following protection functions.

  • Independent (Definite) time over current relay,

  • dependent time over current relay with selectable characteristics, independent short circuit protection

  • 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


Protection of electrical (HV, MV) synchronous generators against:

  • Managing Overload by Load shedding by ROCOF, Underfrequency,…

  • Stator Earth Fault / insulation damages

  • Rotor Earth fault detection

  • Insulation damage due to overvoltage

  • Overfrequency, Underfrequency (over-/underspeed)

  • Vector surge protection against asynchrounous coming back of grid voltage after power outage (e.g. caused by auto reclosure)

Inputs and Outputs
Binary inputs 2
Current transformer inputs 4
Output relays 4
Voltage transformer inputs 3
Watchdog relay 1
Protection ANSI
Voltage protection 27/59
Time overcurrent protection 50/51
Earth fault protection 50N/51N
Circuit breaker failure protection 50BF
Frequency protection 810/81U
Frequency gradient 81
Vector surge / mains decoupling 78V
Additional Features
Disturbance recorder
Fault recorder (none volatile)
Parameter sets 2
Mounting Type
Housing is withdrawable
Housing suitable for door mounting
Housing suitable for mounting plate

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