MRG3-IER Generator Protection Device (MRG3I5E5RD)
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Configuration
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)