MRG3 Generator Protection Device

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Documentation (Brochures & Manuals)

General HighTECH Line User Manual

The MRG3 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 optionally with a multi-purpose over current time and earth fault protection re-lay 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 a comprehensive set of protection functions.

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,…

  • 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
Output relays 4
Voltage transformer inputs 3
Watchdog relay 1
Protection ANSI
Voltage protection 27/59
Frequency protection 810/81U
Frequency gradient 81
Vector surge / mains decoupling 78V
Additional Features
Disturbance recorder
Fault recorder (none volatile)
Parameter sets 2
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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