|Digital Energy Protection & Control Bus Protection|
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.
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.
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.
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
DC power supply
Access via front panel keypad or communication links
EnerVista software for setting & monitoring
Isolated front RS232 serial port
RS485 rear port
Differential protection for single and split busbar arrangements.
Zero sequence differential (restricted ground fault) protection for reactors, generators, large motors, and other power apparatus
High impedance differential protection
Open CT detection
6 outputs, four configurable, plus trip and alarm
Per phase differential current metering
Monitoring of the last 5 trips information from the display
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