Universal Mains Decoupling Device: MRN2

FEATURES
  • Microprocessor technology with watchdog
  • An effective analogue low-pass filter for suppressing harmonics when measuring frequency and vector surge
  • Digital filtering of the measured values by using discrete Fourier analysis to suppress higher harmonics and DC components induced by faults or system operations
  • Integrated functions for voltage, frequency and vector surge in one device.
  • Voltage supervision, each with two-step under-/ and overvoltage detection
  • Frequency supervision with three-step under or over-frequency (user setting)
  • Completely independent time settings for voltage and frequency supervision
  • Adjustable voltage threshold value for blocking frequency and vector surge measuring.
  • Display of all measuring values and setting parameters for normal operation, as well as tripping via an alphanumeric display and LEDs
  • Storage and indication of the tripping values
  • In compliance with VDE 0435, part 303 and IEC 255
  • For blocking the individual functions by the external blocking input, parameters can be set according to the requirement
  • User configurable vector surge measurement, one phase or three phase.
  • Reliable vector surge measurement by an exact calculation algorithm

The MRN2 is a universal mains decoupling device that covers the protection requirements of VDE and most other utilities for the parallel operation of power stations on the mains.

  • Over/and undervoltage protection
  • Over/ and under-frequency protection
  • Extremely fast decoupling of the generator in case of mains failure (MRN2-1) or
  • Rate of change of frequency df/dt (MRN2-2)

Because of the combination of three protectional functions in one device, the MRN2 is a very compact mains de-coupling device. Compared to the standardly used single devices, it has a very good price/performance ratio.

The C&S MRN2 Mains De-coupling Relay is a universal protection device primarily used for the mains parallel operation of power stations and generators. Its key benefits and advantages stem from its integrated, microprocessor-based design, which provides comprehensive and rapid protection functions in a single, cost-effective unit.

  • Features Over-/Undervoltage Protection with separate time and voltage settings.
  • Offers Over-/Underfrequency Protection with completely independent time settings.
    • Vector Surge (MRN2-1 model): Provides extremely fast decoupling in case of mains failure
    • Rate of Change of Frequency (MRN2-2 model): Detects the instantaneous frequency gradient for added stability and protection against transient processes.