MIF II
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FEEDER PROTECTION SYSTEM Economical feeder protection with recloser KEY BENEFITS • Low priced scalable options – event reports, waveform capture, reclosure • Reduce troubleshooting and maintenance cost – Event reports, waveform capture • Automatic display of last fault information • 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 • Password protection for local operation • 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 User Interfaces • EnerVista™ for setting and monitoring • Thermal image protection • 6 LED indicators, 4 configurable in function and colour. • EPTAR-C time-current curves • Independent front RS232 and rear RS485 • Circuit breaker control (open and close) • Multiple Protocols - ModBus RTU, IEC 60870-5-103 • Four shot autorecloser • Cold load pickup element EnerVista™ Software • Configurable breaker failure to open • EnerVista™ software - an industry leading suite of software tools that simplifies every aspect of working with Multilin devices • Configurable I/O • 6 outputs: trip, service required, 4 auxiliary Monitoring & Metering • 32-event record • Analog/digital oscillography • KI2 counter for breaker maintenance • Per phase current metering • Monitoring of the last 5 trips information from the display • EnerVista™ Integrator providing easy integration of data in the MIFII into new or existing monitoring and control systems

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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,...

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events, and includes the values of currents and status of all the protection elements at the moment of the event. Oscillography MIF 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. Use the oscillography feature as an accurate troubleshooting and diagnostics tool Thermal Image Unit A thermal image element protects equipment against overheating due to excessive load. Several operating curves can be set as a...

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Configurable Logic Up to a maximum of 4 configurable logic schemes can be implemented into the MIF II by means of using a set of 4 pre-configured logic gates and timer cells. A graphical user interface is provided for configuration of MIF II logic. The inputs of the MIF II configurable logic can be assigned to contact outputs and/or LEDs. Circuit Breaker Control The MIF II permits operation of the circuit breaker. Breaker opening and closing operations can be carried out by programming specific outputs, and digital inputs can be used for verifying the success of the operation. Autorecloser...

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Communication Ports A front mounted RS232 and a rear RS485 port allow easy user interface via a PC. ModBus® RTU protocol is used for all ports. The relay supports baud rates from 300 to 19,200 bps. Up to 32 Multilin devices can be addressed on a single communications channel. A unique address must be assigned to each relay via a setting when multiple relays are connected. MultiNet™ compatible MultiNetTM is a communications module that provides Multilin serial ModBus IEDs with ModBus TCP/IP communications over Ethernet, allowing connection to fiber optic LAN and WAN network systems. MultiNet...

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Typical Wiring CAUTION: FORK OR RING TERMINALS MUST BE USED ON THE TERMINAL BLOCK NOTES: SUITABLE DISCONNECT DEVICES RECOMMENDED LOCATED NEAR THE RELAY ALTERNATIVE CT WIRING FOR RESIDUAL GROUND SENSING OVERVOLTAGE CATEGORY: II ZERO SEQUENCE GROUND SENSING CONNECTION ZERO SEQUENCE GROUND CT 20 A MAX CIRCUIT BREAKER LOCATED BEFORE POWER INPUT NOTE: 14 AWG wiring recommended SAFETY GND GROUND GROUND BUS PROGRAMMABLE CONTROLLER (*) Terminals B12, A12 and B11 must be connected to SELV (safety extra-low voltage) parts (on the PLC). They are not to be tested for hipot test under any circumstance...

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Technical Specifications PROTECTION PHASE / GROUND TIME OVERCURRENT Current: Fundamental Pickup Level: 0.1 – 2.4 times In (rated current) in steps of 0.01 x In (51P & 51G if 1/5 A ground models). 0.005-0.12 A (51G in sensitive ground model) 0.002-0.048 A (51G in very sensitive ground model) Dropout Level: 97% (typical) of Pickup Level Accuracy: ±1% of injected current at rated current ±3% in the complete range Curve Shapes: IEC (B.S.) A/B/C Level: ±1% at the rated current ANSI Inverse, Very Inverse or Extremely Inverse IAC Inverse, Very Inverse, Extremely Inverse, Inverse Short or Inverse...

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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 MIF Base Unit Application Curves Base Unit 3 Phase + Ground relay Single Phase relay ANSI Curves IEC Curves IAC Curves EPTAR-C curves (only for single phase models)...

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MIF II
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