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General Information

The MIFII is a member of the MII Family of protection relays. This relay is used to perform primary circuit protection on distribution networks at any voltage level, and backup/auxiliary protection for transformers, generators and motors. Basic protection features include time delayed overcurrent , instantaneous overcurrent (two levels), and thermal image protection.

Overcurrent elements can be three-phase and ground or single phase, depending on the selected model. An optional protection offering is also provided for cold load pickup, breaker failure protection, breaker health, configurable logic, and autorecloser. Each protection element can be selectively enabled either via the front panel or via communications.

Flexible settings, and selectable models for ANSI, IEC, IAC or EPTAR-C curves enable accurate coordination with other devices. The basic MIF II has two fixed digital inputs and six fixed digital outputs. An option is provided allowing the two inputs and four of the outputs to be user configurable. The basic MIF II has six fixed status LEDs. An option is provided allowing four of these LEDs to be user configurable. The front panel also features a 5-button keypad and a 16x2 LCD display that provides an easy to use user interface. The front keypad allows the user to set the baud rate and relay address for communication.

A front RS232 and a rear RS485 communication port are provided for computer access using ModBus®RTU protocol. The rear RS485 can be converted to Ethernet by means of an external converter, such as GE Multilin MultiNetTM. The MIF II can be accessed with a PC using the M II EnerVistaTM Setup Software via the RS232 communication port located in the relay front panel. Use EnerVistaTM to view or modify settings and relay configuration (inputs, outputs, LEDs and configurable logic), as well as to display metering information, and real time status. If the relay was furnished with the appropriate option, use EnerVistaTM to display last fault information such as event reports and an oscillography records.