GE MIFIINA05E00HI00 Voltage and Frequency Integrated Protection Relay

GE MIFIINA05E00HI00(MIV II Series) Voltage and Frequency Integrated Protection Relay
I. Basic Information
Brand: GE Vernova (formerly GE Multilin)
Full model name: MIFIINA05E00HI00, belonging to the MII series digital relay protection device
Equipment type: Three-phase voltage + frequency comprehensive protection and measurement control device, mainly used for overvoltage, undervoltage, and frequency abnormal protection of generator sets, plant busbars, and station power systems, to prevent islanding, load shedding, and grid misstep faults
Installation method: 19-inch standard 1/4 rack plug-in installation, with LCD liquid crystal operation display, buttons, and status indicator lights on the front panel
Power supply specification: Wide-range general power supply 110-240VAC / 110-250VDC, the commonly used control power supply of the power plant can be directly connected
Original factory manual: Official English manual “MIV II Instruction Manual”, factory only provides a simple safety card, no paper complete manual

Model Code Interpretation MIFIINA05E00HI00
MIVII: Product series = Voltage and frequency protection relay (MII series)
3000: Hardware configuration specification: Three-phase voltage acquisition + complete set of frequency protection functions, with fault recording, event recording, programmable logic
E00: Standard AC voltage input, no safety explosion-proof, no special hardware customization
HI00: Configuration description:
H: Front panel with LCD Chinese / English liquid display, local button operation
I: Standard RS485 Modbus RTU communication + dual Ethernet interfaces
00: Standard 6 relays outputs (trip, alarm, fault signal), 2 groups of switchable set values

Core Protection Functions (ANSI Standard Protection Elements)
1. Voltage Protection
Three-phase overvoltage 59, three-phase low voltage 27
Zero-sequence overvoltage 59N (grounding overvoltage protection)
Voltage imbalance protection 47, to prevent three-phase phase loss, broken wire damage to motors and transformers
Independent delay can be set to avoid system instantaneous voltage disturbance, avoiding false tripping
2. Frequency Protection (core protection for grid high-frequency / low-frequency misstep)
Low-frequency protection 81U, high-frequency protection 81O
Frequency rate of change ROCOF (df/dt) anti-islanding protection
Suitable for self-owned power plants, distributed power sources to prevent anti-islanding tripping during grid faults, rapid separation
3. Additional Functions
2 independent set values zones: Can switch protection parameters between grid-connected / islanded grid conditions in one click
Fault recording: 24 waveforms before and after the fault, facilitating post-fault traceability
Event sequence recording SOE: Up to 24 milliseconds timestamp events, the most recent 5 tripping fault information
Programmable logic FlexLogic: Can customize interlocks, tripping locking, remote activation/deactivation logic
Breaker position monitoring, control circuit breakers’ disconnection alarm

Hardware I/O and Communication Configuration
Analog input: Three-phase voltage PT connection (conventional 100V secondary voltage)
Switching input DI: Multiple passive remote signals, used for protection activation/deactivation, remote locking, breaker position
Relay output DO: 6 C-type passive contacts, including dedicated trip contacts, multiple alarm signal contacts
Communication interface: Dual Ethernet (Modbus TCP) + RS485 (Modbus RTU), can be connected to DCS, SCADA background to achieve four remote functions (telemetry, telemetry, remote control, remote adjustment)
Local human-machine: 2×16-character LCD display, parameter setting, real-time measurement, fault viewing, set value upload/download

 Typical Application Scenarios Steam / gas power generation units, islanding protection for grid connection of waste heat power stations, high and low frequency separation protection
Plant high-voltage busbar, voltage monitoring and locking for standby power auto-transfer (BZT)
Voltage and frequency islanding protection for photovoltaic and biomass distributed power sources at the connection point
Overvoltage and unbalanced voltage fault protection for large motors and transformers