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Multilin  MIB

High Impedance Busbar Differential Relay

 

The MIB, a member of the M II family of economical and highly functional digital protection relays, is a microprocessor based relay that provides three phase high impedance differential protection for Substation Bus-bars of any voltage level.

Use the MIB also to protect electrical machines like transformers, generators or motors against restricted earth faults.

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Basic protection functions features include a high impedance differential protection unit with a tripping time of 1 1/2 cycles. Stability against external faults is guaranteed thanks to the use of a stabilizing resistor. The unit includes a set of MOVs (Metal Oxide Varistors) provided to clamp the secondary peak voltage below 2kV during fault conditions.

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The relay includes open CT detection which provides an alarm when it detects sustained current unbalance conditions, issuing a warning signal and blocking the operation of the unit.

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Features & benefits :

  • Configurable logic, curves, I/Os and LEDs

  • Flash memory for field upgrades

  • Two settings groups

  • Drawout case

  • Password protection for local operation

  • Automatic display of last fault information

  • DC power supply

  • Access via front panel keypad or communication links

  • EnerVista software for setting & monitoring

  • Isolated front RS232 serial port

  • RS485 rear port

 

Applications

  • Differential protection for single and split busbar arrangements.

  • Zero sequence differential (restricted ground fault) protection for reactors, generators, large motors, and other power apparatus

 

Protection & Control 

  • High impedance differential protection

  • Open CT detection

  • Lockout logic

  • Configurable I/O

  • 6 outputs, four configurable, plus trip and alarm

 

Monitoring & Metering

  • 24-event record

  • Analog/digital oscillography

  • Per phase differential current metering

  • Monitoring of the last 5 trips information from the display

 

User Interface

  • 2x16 character LCD display

  • 6 LED indicators, 4 configurable in function and color

  • EnerVista software for setting and monitoring

  • Front RS232 and rear RS485 ports using ModBus® RTU protocol up to 19,200 bps

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MIB Brochure

MIB Manual

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