GE Multilin MIFIIPA55E10HI00 MIFII Digital Feeder Relay

GE Multilin MIFIIPA55E10HI00 MIFII Digital Feeder Relay

Configured for primary circuit protection on distribution networks and backup protection for transformers, generators, and motors, the GE Multilin MIFIIPA55E10HI00 (MIFII Digital Feeder Protection Relay) provides direct physical/electrical execution.

Hardware Specifications

Industrial Protection and Overcurrent Coordination

Digital feeder protection relays evaluate secondary current waveforms from phase and ground CTs to isolate overcurrent faults before upstream switchgear trips. The MIF II system utilizes selectable ANSI time-overcurrent (51/51N) and instantaneous overcurrent (50/50N) algorithms alongside thermal image protection. Real-time signal analysis across 5 A phase/ground inputs maintains phase overcurrent coordination and ground fault sensitivity, preserving continuity for healthy distribution feeders while capturing oscillography and event records for post-fault diagnosis.

Frequently Asked Questions

Q: What control power range is supported by the "HI" power supply option?

A: The high-voltage "HI" power supply unit operates across 110 to 250 VDC (88–300 VDC absolute range) or 110 to 230 VAC (88–264 VAC absolute range).

Q: Does the MIFIIPA55E10HI00 support automatic reclosing?

A: No. The "0" digit in the ordering code specifies the unit is supplied without internal auto-recloser functionality.

Field Installation Guidelines

• Confirm control power source voltage matches the HI power supply limits (110–250 VDC or 110–230 VAC) prior to energizing the unit.
• Verify phase CT and ground CT secondary wires are shorted at the test block before disconnecting or installing relay current input terminals.
• Mount the relay flush into the panel cutout, securing the retaining clamps to maintain tight panel seating.
• Wire the rear RS485 communication port using shielded twisted-pair cable, terminating the shield ground strictly at the master SCADA panel.
• Upload existing configuration settings via EnerVista software or front RS232 port, verifying CT ratios and trip curves match system protection studies.