Overview
The GE Multilin MIFPI55E000H00C, also cataloged as the MIFPI55E000H00C MIF II Feeder Protection Relay, operates as a dedicated hardware component for feeder current measurement, protection logic execution, and trip output control within electrical distribution protection networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MIFPI55E000H00C |
| Brand | GE Multilin (GE Grid Solutions) |
| Origin | United States |
| Dimensions | Panel-mounted relay enclosure; dimensions not specified in available documentation |
| Power Consumption | Less than 0.2 VA relay burden at 5 A nominal current |
| Product Series | MIF / MIF II Digital Feeder Protection Relay |
| Application | Feeder protection, monitoring, and control |
| Phase Current Input | 5 A nominal CT input |
| Ground Current Input | 5 A nominal CT input |
| Frequency Range | 50/60 Hz with +/- 3 Hz tolerance |
| Power Supply | 110-250 VDC or 110-230 VAC |
| Communication Interface | Front RS232 and rear RS485 |
| Communication Protocol | Modbus RTU |
| Display Interface | 2 x 16 alphanumeric LCD with 5-button keypad |
| Event Recording | Up to 32 time-tagged events with 1 ms resolution |
| Oscillography | 8 samples per cycle, 1 x 24 cycles waveform capture |
| Output Contacts | Up to 6 programmable relay outputs |
| Protection Functions | ANSI 50, 50G, 51, 51G, 49, 50BF |
GE Industrial Protection Processing and Communication Functions
The GE Multilin MIFPI55E000H00C uses digital signal processing to evaluate phase and ground current inputs before executing protection algorithms. The relay applies IEC standard inverse time curves and supports FlexCurve configuration for user-defined protection characteristics.
Furthermore, the relay processes instantaneous and time-delayed overcurrent elements through ANSI 50, 50G, 51, and 51G functions. The thermal image algorithm monitors accumulated heating conditions under ANSI 49 protection logic, while the breaker failure function provides configurable backup trip supervision.
The communication design supports Modbus RTU data exchange through RS232 and RS485 interfaces. Therefore, the relay can transfer metering values, event records, and protection status information to supervisory control systems.
The conformal-coated internal circuitry provides additional protection against moisture, dust, and corrosive environmental conditions. In addition, the hardware design supports installation in industrial electrical cabinets where environmental exposure requires additional circuit protection.
Frequently Asked Questions
Q: Does the GE Multilin MIFPI55E000H00C support both phase and ground overcurrent protection?
A: Yes. The relay supports phase and ground instantaneous overcurrent functions (ANSI 50 and 50G) and phase and ground time-delayed overcurrent functions (ANSI 51 and 51G).
Q: What communication interfaces are available on the MIFPI55E000H00C?
A: The relay provides a front-panel RS232 port and a rear RS485 terminal interface. Both interfaces support Modbus RTU communication.
Q: Does this relay support waveform recording for fault analysis?
A: Yes. The relay includes oscillography recording with waveform capture capability at 8 samples per cycle for 1 x 24 cycles.
Field Installation Guidelines
- Install the relay inside a suitable protection panel with correct mechanical support and clearance for wiring access.
- Connect phase CT and ground CT circuits according to the specified polarity and protection scheme requirements.
- Use shielded communication cables for RS485 wiring and connect cable shields according to site grounding practices.
- Separate communication wiring from high-current power conductors to reduce electromagnetic interference.
- Verify auxiliary supply voltage before energizing the relay. The MIFPI55E000H00C supports 110-250 VDC and 110-230 VAC input ranges.
- Confirm CT secondary wiring integrity before applying current inputs to the protection elements.
- Perform protection setting verification after installation, including overcurrent pickup values, time curves, and trip output logic.
