1. Product Description

MIVII3000E00HI00 is the high-end model of GE Vernova MIVII series numerical voltage/frequency protection relay, upgraded version of MIVII1000 series, dedicated to grid voltage, frequency and unbalance monitoring protection for generators, transformers, busbars and important feeders.

Model code definition: - MIVII3000: High-capacity voltage & frequency protection mainframe, supports high sampling rate COMTRADE fault recording, expanded I/O channels - E00: Standard universal wide-range AC/DC auxiliary power supply - HI00: Standard front LCD HMI, dual Ethernet communication, no optional arc flash module, standard analog/digital I/O configuration

Core technical specifications: 1. Power supply: 24VDC ±20% / 110~240VAC auto-adaptive wide-range power supply 2. Frequency adaptation: 47~63Hz, support manual locking 50Hz/60Hz mode 3. Measurement precision: Voltage ±1% rated value, frequency ±0.01Hz, unbalance degree ±3% full scale 4. Fault recording: 8 samples per cycle, maximum 24-cycle waveform storage, internal/external trigger mode COMTRADE waveform recording 5. Environmental adaptability: Operating temperature -10℃ ~ +60℃, front panel IP54 dustproof and splash-proof, PCB full conformal coating anti-corrosion 6. Compliance standard: IEC 60255, ANSI C37 protection standard, UL & CE certification

Difference vs MIVII1000E00HI00: MIVII3000 expands I/O quantity, improves sampling precision, supports longer fault waveform storage, adds negative sequence voltage protection, multi-group load shedding logic and generator anti-islanding function.

2. Core Product Functions

• Complete ANSI Voltage & Frequency Protection Function Library Integrated undervoltage (27), overvoltage (59), overfrequency (81O), underfrequency (81U), negative sequence unbalance voltage (47), voltage rate-of-change (df/dt) anti-islanding protection; multi-stage definite/inverse time delay configurable for selective coordination.
• Multi-Grade Automatic Load Shedding Logic Programmable multi-level load shedding sequence, automatically cut non-critical loads when grid voltage/frequency exceeds threshold to guarantee power supply of key equipment (generators, compressors, DCS).
• High-Precision Three-Phase Electrical Measurement Real-time three-phase line/phase voltage, zero-sequence voltage, frequency, voltage unbalance rate, power factor monitoring; support CT/PT ratio setting to display primary grid actual values.
• COMTRADE Fault Waveform Recorder & Event Logger Store timestamped fault waveforms, record up to hundreds of event logs (trip, alarm, communication fault, parameter modification); each event attaches real-time voltage/frequency snapshot for post-fault analysis.
• Dual Redundant Industrial Communication Dual Ethernet Modbus TCP for SCADA/DCS remote data transmission; rear RS485 Modbus RTU port for local debugging; support time synchronization via SNTP.
• Local HMI Operation & On-Site Test Front LCD with physical operation buttons for parameter setting, real-time data browsing, fault query, manual breaker control; built-in self-test function to verify all protection logic offline.
• Comprehensive Self-Diagnosis & Alarm Output Continuously monitor PT fuse failure, internal chip fault, power undervoltage, communication interruption; output isolated dry contact alarm signals to annunciator panels.
• 8 Groups Swappable Protection Setting Groups Store multiple groups of voltage/frequency protection parameters, automatically switch settings according to grid operation mode (grid-connected/island, peak/off-peak load).

3. Typical Application Scenarios

• Cogeneration & Thermal Power Plant Generators Grid-connected generator anti-islanding protection, unit over/under frequency & voltage supervision, auxiliary busbar load shedding control.
• Industrial Medium-Voltage Substation Main Busbars Factory power distribution bus voltage/frequency monitoring, automatic load shedding to protect production core equipment during grid fluctuation.
• Oil & Gas Refinery & Offshore Platform Turbine Generators Isolated power grid voltage stability protection, graded load cut-off for compressors and crude transfer pumps.
• Solar/Wind New Energy Power Stations Distributed generation grid-connected protection, prevent island operation when main grid power failure, voltage/frequency ride-through logic matching grid codes.
• Municipal Substation & Large Data Center Power Rooms Important feeder voltage backup protection, emergency power supply switching interlock control.
• Chemical Plant Self-Generation Units Furnace, reactor power supply voltage abnormal protection, avoid dangerous process shutdown caused by grid fluctuation.

4. Common Faults & Troubleshooting Issues