MRG3-IER Generator Protection Device (MRG3I1E1RD)

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Product number: MRG3I1E1RD


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

  • 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,

  • integrated determination of earth fault direction for application to power system networks with isolated star point or earth fault compensation (ER/XR-relay type)

  • 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)

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