Description
At-A-Glance Executive Brief
- Model: MIFIIPI55E20HI00
- Brand: GE Multilin (GE Digital Energy)
- Part Type: MIF II / MIFII Feeder Management Relay (numerical protection IED)
- Lifecycle status: EOL legacy substation spare; stocked for brownfield utility and industrial MV substation maintenance, retrofits and spare backup
- System compatibility: Medium voltage feeder bays, CT/VT circuits, substation SCADA systems; delivers full suite feeder protection, breaker control, metering, fault location, disturbance recording and serial/Ethernet communication
- Weight: ~4.1 kg
Technical Introduction
Failure of MIFIIPI55E20HI00 results in complete loss of MV feeder protection and bay control. The relay cannot detect phase faults, earth faults, overload or breaker failure conditions, and loses breaker tripping/close control, fault event capture and SCADA reporting. The unprotected feeder creates risk of sustained short-circuit damage to transformers, cables and switchgear, leading to extended power outages and substation safety hazards.
GE Multilin MIFII MIFIIPI55E20HI00 is a legacy numerical feeder protection and management IED designed for medium voltage overhead and cable feeders. The full ordering code defines hardware I/O configuration, power supply, HMI, communication options and firmware variant. It integrates multi-stage phase overcurrent, directional/non-directional earth fault, sensitive earth fault, breaker failure, thermal overload, over/under voltage and frequency protection. It includes built-in fault locator, disturbance recorder, sequence of events (SOE) logging and breaker maintenance monitoring. Communication interfaces support DNP3, Modbus, IEC 60870-5-103 for SCADA integration. The front-panel HMI with keypad and display allows local metering reading, setting access and fault review. Widely deployed in utility distribution substations, mining, petrochemical and industrial power distribution networks. Substation reliability teams stock MIFIIPI55E20HI00 to restore feeder bay protection during planned outages or unexpected relay failures.
- Best Suited For
- Medium voltage cable and overhead feeder protection, breaker bay control
- Utility / industrial substation automation, fault recording, fault location and SCADA integration
- Direct drop-in replacement for existing GE Multilin MIFII MIFIIPI55E20HI00 feeder relay hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | MIFIIPI55E20HI00 |
| Manufacturer | GE Multilin (GE Digital Energy) |
| Product Type | MV Feeder Management & Protection Relay IED |
| Protection Functions | Phase overcurrent, directional earth fault, sensitive earth fault, breaker failure, thermal overload, voltage/frequency protection |
| Recording | Disturbance recorder, fault locator, SOE / event log |
| Local Interface | Front panel LCD + keypad HMI |
| Communication | DNP3, Modbus, IEC 60870-5-103 |
| Inputs | CT/VT analog inputs, binary status inputs |
| Outputs | Trip and control binary outputs |
| Mounting | Panel / rack mount in substation control cubicle |
| Operating Temperature | -40℃ ~ +70℃ |
| Humidity | 5–95% RH non-condensing |
| Weight | ~4.1 kg |
| Environmental Details | Please refer to the OEM datasheet for complete environmental tolerances and hazardous location certifications. |
Field Engineer’s Tech Notes
- Verify the full ordering code MIFIIPI55E20HI00, I/O layout, power supply rating, firmware revision and setting file before replacement; ordering-code mismatch causes I/O or protection function incompatibility.
- Apply feeder protection bypass, lockout/tagout and short CT circuits before decommissioning the old relay; protection will be disabled during replacement. CT open circuit presents severe high-voltage hazards.
- Inspect CT shorting terminals, VT fuses, binary wiring and communication cabling; loose connections and CT/VT wiring errors are common root causes of relay measurement and trip faults.
- After installation, load the site setting file, perform CT/VT ratio and polarity verification, secondary injection test of all protection elements, test breaker control, autoreclose and fault recording. Validate SCADA point transmission, clear all alarms and remove bypass before energizing the feeder.
- ESD protection required while handling internal PCB assemblies.
- Conduct periodic secondary injection testing and setting audits in line with substation maintenance schedules.
Adaptive QA & Testing Protocol
Each MIFIIPI55E20HI00 relay is bench tested using a relay test set. We verify power supply startup, front-panel HMI operation, binary input/output response and CT/VT analog measurement accuracy. Secondary injection tests validate overcurrent, earth fault and trip logic, fault location and disturbance recording. Event logging and SCADA communication protocols are verified. PCB, front panel, terminal blocks and solder joints are visually inspected for corrosion, burn marks or component damage. Full test reports are available upon request.
Buyer’s FAQ
Q: What is GE MIFIIPI55E20HI00 used for? A: It is a GE Multilin MIFII numerical feeder management relay for medium voltage feeders, providing fault protection, circuit breaker bay control, power metering, fault location, disturbance recording and SCADA communication.
Q: What warranty applies for refurbished and NSFP MIFIIPI55E20HI00? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes ESD damage, CT/VT surge damage, setting file mismatch, incorrect secondary injection and improper protection bypass procedures.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory depleted, we source surplus GE Multilin MIFII relays matching ordering code MIFIIPI55E20HI00.
Q: Is the MIFII series still in active production? A: No, GE MIFII series is end-of-life legacy protection relay, no longer manufactured.
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