KEY BENEFITS

• Low priced scalable options – event reports, waveform capture, reclosure • Reduce troubleshooting and maintenance cost – Event reports, waveform capture • Design flexibility – Easy to use programming logic • Asset monitoring – Breaker health, and breaker failure • Access to information – Modbus RTU communications • Configurable logic, curves, I/Os and LEDs • Flash memory for field upgrades

• Two settings groups • Password protection for local operation • Automatic display of last fault information • AC/DC power supply • Improved user interface • Access via front panel keypad or communication links • EnerVista™ compatible • Isolated front RS232 serial port

APPLICATIONS

• Primary feeder protection on distribution networks  • Backup/auxiliary protection for transformers, generators   and motors

FEATURES

Protection and Control • Phase and ground TOC and IOC • Thermal image protection • IAC time-current curves • EPTAR-C time-current curves • Circuit breaker control (open and close) • Four shot autorecloser • Cold load pickup element • Configurable breaker failure to open • Configurable I/O •  6 outputs: trip, service required, 4 auxiliary

Overview

The MIF II is a member of the M II 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. 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 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. Protection 1 79 Monitoring CLOSE 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. 50G-2 51G The MIF II provides primary circuit   protection for distribution feeders, and backup/auxiliary protection for transformers, generators and motors.   As part of the M II Family, the MIF II   provides advanced digital protection which includes: Overcurrent Protection BREAKER HEALTH BREAKER FAILURE TO OPEN OSCILLOGRAPHY EVENT RECORDING COLD LOAD PICKUP CONFIGURABLE I/O AND LEDS A variety of time curves are provided, depending on model. It includes GE IAC, ANSI, IEC, EPTAR-C (for resistive earths), definite time and user-programmable curves. The GE-IAC curves inverse, very inverse, extremely inverse, short and long inverse allow retrofit of popular electromechanical IAC relays. Phase TOC The TOC protection can be set from 0.1 to 2.4 per unit. Four standard TOC curves can be selected in addition to a user configurable curve. Each curve can be set with customized time multipliers to coordinate with equipment. Ground TOC This element has the same curve selection choices and settings as the phase time overcurrent element. The ground signal is normally derived as the residual sum of the three-phase CTs eliminating the need for an additional ground sensor. For more sensitive detection, an additional core   balance (zero sequence) ground sensor encircling the three-phase conductors can be used. Instantaneous Overcurrent The MIF II includes two separately adjustable IOC elements, each of which can be independently enabled. MIF II   models provide two three-phase IOC   elements and two ground IOC elements. The pickup setpoint can be set from 0.1 to 30 times In and a time delay from 0 to 600 seconds.

GE XAMP-1-1-2-0-0 

MIFIIPI55E20LO00  

GE H201CI-1