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MIW II - Legacy
Directional Power Protection System

Manufacturing for this product has been discontinued. As an alternative, please refer to the Multilin 350 or 889 relays.

The MIW II, a member of the M II Family of Relays, is a digital device that provides directional power and loss of field protection for generators. Operation of the MIW II is based on the calculated direction of 3 phase power flow. The MIW II can be ordered with either one of the following two option packages:
  • Four protection elements for directional power
  • Three protection elements for directional power, one loss of field element, and one fuse failure element
Features and Benefits
  • Configurable logic, curves, I/Os and LEDs
  • Flash memory for field upgrades
  • Two settings groups
  • Password protection for local operation
  • Automatic display of information from last 5 faults
  • Drawout case for easy maintenance
  • AC/DC power supply
  • Access via front panel keypad or communication links
  • Diagnostic features - event recording and analog/digital oscillography
  • Isolated front RS232 serial port

  • Controlling power flow in AC generator applications of any size

Protection and Control
  • Available versions are three power protection elements (32_x) for MIWII1000 and four power protection elements for MIWII2000
  • Loss of field/excitation protection element (40)
  • VT fuse failure protection element (60)
  • 6 outputs, four configurable, plus trip and alarm

Monitoring and Metering
  • Metering values for Ia, voltage values, P, Q, S, V1, V2, and angle
  • 24-event record
  • Analog/digital oscillography - 24 cycles at 8 samples per cycle
  • Information displayed on last 5 relay trips

User Interface
  • 2x16 character LCD display
  • 6 LED indicators with 4 configurable in function and in color
  • Front RS232 and rear RS485 ports using ModBus® RTU protocol up to 19,200 bps
  • EnerVista software - an industry leading suite of software tools that simplifies every aspect of working with GE Multilin devices