GE MIFIIPA55E20HI00 Multilin MIF II Digital Feeder Protection Relay

GE MIFIIPA55E20HI00: Multilin MIF II Digital Feeder Protection Relay

The GE MIFIIPA55E20HI00 is a member of the Multilin™ MIF II family, a series of compact, microprocessor-based digital relays designed for primary and backup feeder protection.

This specific model is a 3-Phase + Ground relay that provides essential protection, control, and monitoring functions for distribution networks, transformers, and motors.

It is recognized for its cost-effectiveness and reliability in both utility and industrial power systems.

Technical Parameter Table

Related Models

The MIFIIPA55E20HI00 is often compared with these variations within the M II family:

MIFIIPI11E10HI00: 1A Current input version.

MIFIIPI55E2RHI00: Version including integrated Autorecloser functionality (‘R’ option).

MIFIIPI11E10LO00: Low-voltage DC power supply version (24-48 V DC).

MIFIINI11E00HI00: Single-phase variant for specific neutral or ground applications.

Application Cases

Medium Voltage Feeders: Primary overcurrent and ground fault protection for radial or looped distribution lines.

Transformer Backup: Providing secondary-side protection for power transformers in industrial substations.

Motor Protection: Used as an economical protection solution for large AC motors where thermal image and overcurrent protection are required.

Legacy Upgrades: Replacing older electromechanical (e.g., GE IAC series) relays with modern digital communications and event recording.

Product Advantages and Features

Comprehensive Protection: Combines Phase/Ground Time Overcurrent (51P/51G) and Instantaneous Overcurrent (50P/50G) in one unit.

Thermal Image Unit: Protects equipment against overheating by modeling thermal load over time.

Event & Fault Recording: Stores up to 32 event records and includes oscillography (waveform capture) for post-fault analysis.

Flexible Logic: Features 4 configurable logic gates to allow users to customize trip and alarm conditions without external wiring.

Rugged Environment Coating: The “H” in the order code suffix often indicates a harsh environment conformal coating for protection against moisture and chemicals.

Installation and Maintenance

Mounting: Designed for standard panel cutout installation. Ensure the relay is properly grounded via the rear ground terminal to prevent EMI issues.

Wiring: Use high-quality CT wiring. The relay supports standard 5A CT inputs. Verify that the power supply (HI range) matches your station battery or AC source.

Maintenance: The relay is self-monitoring and will trigger a “Service Required” alarm if internal hardware fails. It is recommended to perform secondary injection testing every 2-3 years to verify the trip threshold accuracy.

Software: Use EnerVista™ MIF II Setup software via the front RS232 port for easy configuration and downloading of fault records.

Unique Product Description

The GE MIFIIPA55E20HI00 is the “Economic Workhorse” of the Multilin protection line. While high-end relays focus on complex grid automation, the MIF II focuses on reliability and simplicity.

It provides the high-speed processing of a modern numerical relay at a price point accessible for smaller industrial plants and commercial distribution.

Its ability to capture waveforms during a fault makes it an invaluable tool for engineers who need to understand why a breaker tripped, rather than just knowing that it did.

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Primary Keywords: MIFIIPA55E20HI00. GE Multilin MIF II, Feeder Protection Relay, Phase Ground Relay, 3BHE014185R0002. 5A Protection Relay.