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MIW II Directional Power Protection System
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

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

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