MIG II
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Generator Protection MIG II Generator Protection System Three-phase and ground protection for small generators Key Benefits • Reduce troubleshooting and maintenance cost - event recording, and analog/digital oscillography • Design flexibility - Easy to use programming logic • Automatic display of last fault information • Access to information - Modbus RTU communications • AC/DC power supply • Configurable logic, curves, digital I/Os, and LEDs • Access via front panel keypad or communication links • Follow technology evolution - Flash memory for product field upgrade • EnerVistaTM compatible • Password protection for local operation Applications • Small generators and motors • Small motor protection • Component for bigger generator packages • Transformer protection • Standby/critical power protection main unit Features Protection and Control • Analog/digital oscillography • Thermal image protection • Per phase current metering • Circuit breaker control (open and close) • Monitoring of the last 5 trips information from the display • Negative Sequence Element User Interfaces • Restricted Ground Differential Element • 6 LED indicators, 4 configurable in function and color • Maximum number of starts • Front RS232 and rear RS485 ports using ModBus® RTU protocol up to 19,200 bps • Locked rotor • Configurable I/O • Six outputs: trip, service, 4 auxiliary • 4 pre-configured overcurrent curves (ANSI, IEC) • EnerVistaTM Software - an industry leading suite of software tools that simplifies every aspect of working with GE Multilin device

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MIG II Generator Protection System Generator Protection 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 an RS232 or fiber optic port (plastic or glass fiber optics) by means of using an external converter, such as GE Multilin DAC300 or F485. Windows® based EnerVista™ software is provided free of charge with the relay to allow setup and configuration of MIG II features. Computer access allows setting and...

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MIG II Generator Protection System Phase Instantaneous Overcurrent The MIG II includes one adjustable phase instantaneous overcurrent unit. Settings allow the pickup setpoint to be set from 0.1 to 30 times FLC and a time delay from 0 to 100 seconds to be set. Ground Time Overcurrent The ground time overcurrent protection has the same curve selection choices and settings as the phase time overcurrent unit. The ground signal is normally derived as the residual sum of the three phase CTs eliminating the need for an additional ground sensor. Alternatively, for more sensitive detection, an...

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MIG II Generator Protection System Generator Protection Oscillography MIG II captures current waveforms and digital channels at 8 samples per cycle. One oscillography record with a maximum length of 24 cycles is stored in memory. Oscillography is triggered either by internal signals or an external contact. Configurable I/O and LEDs Two digital inputs are user configurable. Out of the six digital outputs incorporated, two have a fixed function (trip and service required), while the other four are user programmable. Those configurable outputs can be assigned either to a set of preconfigured...

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MIG II Generator Protection System A five-button keypad allows user access for easy relay interrogation and change of settings. Access to events and oscillography records, and unit configuration is possible only through PC communication. Self-Test Diagnostics Comprehensive self-test diagnostics occur at power up and continuously during relay operation. Any problem found by self-tests causes an alarm and an event is logged. • Converts Modbus RTU over RS485 into Modbus TCP/IP over Ethernet • Supports both 10BaseT and 10BaseF fiber connections • Connect up to 32 RS485 serial devices to an...

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MIG II Generator Protection System Typical Wiring Generator Protection Note: Only for reference. For particular connections for any MIG II model, please refer to its external connections drawing. REF CONNECTION WIRING DIAGRAM GENERATOR PHASE A CT POWER SUPPLY INTERNALLY FUSED 1A / 250 V FAST BLOW CURRENT INPUTS SAFETY GND GROUND GROUND BUS WARNING: GROUND PC TO RELAY GROUND. OTHERWISE USE UNGROUNDED PC DIGITAL OUTPUTS (**) Multilin MIG II P Digital Protection System for Electrical Machines DIGITAL INPUTS (**) TRIP COIL SYSTEM READY TRIP COIL CONTROL POWER PROGRAMMABLE CONTROLLER (*)...

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MIG II Generator Protection System PROTECTION PHASE AND GROUND TIME OVERCURRENT (51P, 51G) Current: Fundamental Pickup level: 0.1 - 2.4 FLC in steps of 0.01 Drop out level 97% of the pickup level Accuracy ±3% in the complete range Curves IEC or ANSI inverse, very inverse, extremely inverse, user defined (depending on model). Definite time 0.00 to 600.00 s in steps of 0.01 s Reset type: Instantaneous Timer accuracy: ±50 ms or 3% for I > 1.2 times the pick up level PHASE AND GROUND INSTANTANEOUS OVERCURRENT (50P, 50G) Current: Fundamental Pickup level: 0.1 - 30 FLC in steps of 0.01 Drop out...

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MIG II Generator Protection System Generator Protection User Interface DISPLAY 16x2 characters LCD display for viewing setpoints, actual value messages, and fault reports STATUS INDICATION LEDs Four of six status LEDs are user programmable in function and color CONTROL AND PROGRAMMING KEYS Escape, Reset, Enter, Menu Up, and Menu Down keys for complete access to settings and information without a computer PROGRAMMING PORT RS232 Communications Port for connection to a computer Ordering To order select the basic model and the desired features from the Selection Guide below: MIG II Application...

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MIG II
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