GE Multilin MIFIIPI55E00HI00 M II Family Feeder Protection Relay

Description

3. Part Number Breakdown (MIFIIPI55E00HI00)

Using the official GE Multilin M II series catalog nomenclature, the specific configuration of the MIFIIPI55E00HI00 can be decoded as follows:

4. Product Introduction & Supply Chain Strategy

The GE Multilin MIFIIPI55E00HI00 is an microprocessor-based digital protection relay developed under the M II product line. It serves as an economical, space-saving solution for primary overcurrent protection on low-to-medium voltage distribution lines and behaves as highly reliable backup protection for large generators, power transformers, and heavy-duty electric motors. This model is configured specifically to process 3-phase currents and ground faults utilizing a standard 5A CT rating, integrating precise IEC-standard timing curves to achieve reliable fault clearing and selectivity across the power system grid.

For substation operators and facility control engineers, sourcing a New Surplus MIFIIPI55E00HI00 is an invaluable risk-reduction measure. When an older protection relay degrades due to internal component aging or thermal stress, the associated switchgear cannot safely remain online, resulting in localized blackouts or turbine trips. Opting for a certified zero-hour new surplus module bypasses the quality concerns associated with repaired or salvaged units, which are often prone to undetected memory block degradation or uncalibrated analog inputs. Maintaining a factory-fresh unit on hand allows immediate, drop-in replacement with zero field programming mismatch.

MIFIIPI55E00HI00

MIFIIPI55E00HI00

MIFIIPI55E00HI00

5. Installation & Technical Verification

Stage 1: Pre-Installation Inspection

Before mounting the relay, perform a visual inspection of the plastic case, looking for any physical damage to the keypad, LCD, or rear terminal blocks. Verify that your auxiliary voltage source aligns with the “HI” rating (110–250 VDC or 110–230 VAC) of this specific unit. Wear a grounded ESD wrist strap whenever working near the connection pins.

Stage 2: Mechanical Integration

The MIF II features a compact, panel-mount chassis designed to fit standard cutout openings. Insert the relay case from the front of the switchgear panel door. Secure the unit in place using the standard side-mounting brackets and hardware. Ensure the chassis ground terminal is securely bonded to the panel frame using a low-impedance ground braid.

Stage 3: Wiring Connections

Wire the CT inputs, control power, and digital outputs to the rear screw-terminal block as dictated by your electrical schematic:

• CT Inputs: Connect Phase A, B, C, and Ground CT secondaries (ensure correct polarity to prevent false differential or ground-fault readings).
• Control Power: Apply supply voltage to the dedicated “HI” terminals.
• Output Contacts: Wire the main Trip contacts directly to your circuit breaker’s shunt trip coil or lockout relay.

Stage 4: Commissioning & Startup

1. Energize the relay. The green “READY” LED on the faceplate must light up, and the 16×2 alphanumeric display will initiate its English-language startup screen.
2. Connect your PC to the front RS232 port (or rear RS485 port) and run the enerVista MIF II Setup software to upload your setting files.
3. Perform a primary/secondary current injection test using a protective relay test set. Validate that the phase and ground pickup limits, alongside the chosen IEC time curves, trip the output contacts within the designated time envelopes.

6. Frequently Asked Questions (FAQ)

What protection curves are supported by the “I” option in this relay?

Because this model is configured with the “I” option, it comes pre-programmed with standard international IEC (B.S.) curve shapes, including IEC Inverse, IEC Very Inverse, and IEC Extremely Inverse, along with a programmable Definite Time setting.

Does this base model “MIFIIPI55E00HI00” include automatic reclosing?

No. Based on the “00” configuration string following the language option, this specific unit is a Base Model without the optional multi-shot auto-recloser functionality and without advanced options like breaker failure logic or cold-load pickup. It focuses primarily on time-delayed and instantaneous overcurrent and thermal protection.

Is this GE Multilin relay brand new?

Yes. This is a Brand New Surplus unit. It is not used, has not been pulled from decommissioned switchgear, and has not undergone third-party electronic repair. The relay is supplied in original protective packaging, featuring clean terminal screws, scratch-free faceplates, and untouched internal memory.

What warranty terms apply to this legacy protection relay?

We provide this New Surplus MIFIIPI55E00HI00 digital protection relay with our comprehensive 1-year operational warranty. If a hardware fault occurs within this time frame under normal operating parameters, we will facilitate an immediate replacement or repair.