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GE MIVII1000E00HI00 | Multilin MIVII Voltage Protection Relay – Field Service Notes

  • Model: MIVII1000E00HI00
  • Alt. P/N: MIV-II-1000E00HI00
  • Product Series: GE Multilin MIVII
  • Hardware Type: Microprocessor three-phase voltage monitoring & protection relay
  • Key Feature: Independent phase voltage detection with phase sequence and loss-of-potential logic
  • Primary Field Use: Monitors bus voltage, trips or alarms on sag, swell, phase loss and phase reversal across distribution systems
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Part number: GE MIVII1000E00HI00
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Description

Hard-Numbers: Technical Specifications

  • Protocol Support: Modbus RTU, RS485 two-wire serial
  • Port Count: 1 × RS485 communication port, local keypad/LCD HMI
  • VT Input Range: 100V nominal three-phase voltage input
  • Operating Temperature: -20°C to +70°C indoor cabinet continuous operation
  • Isolation Rating: 2000Vrms isolation between VT circuits and control electronics
  • Power Draw: 11VA maximum steady-state load
  • Output Contacts: Form-C relay outputs, 5A resistive switching rating
  • Measurement Resolution: High-speed cycle sampling for fast voltage transient capture
  • Event Storage: Non-volatile memory for voltage disturbance logs and timestamps
  • Mounting: Standard panel cutout style for low/medium voltage control cabinets

 

The Real-World Problem It Solves

Grid sags, sudden voltage swell and broken VT fuses create unmonitored voltage events that damage motors, VFDs and plant auxiliary loads. This relay watches each phase individually to catch single-phase anomalies old electromechanical units miss.

Where you’ll typically find it:

  • Power plant auxiliary MV bus protection panels
  • Refinery main distribution switchgear lineups
  • Water treatment and heavy industrial facility incoming feeder cabinets

Bottom line: It adds granular voltage supervision to prevent equipment stress and unnecessary downstream load dropout during unstable grid conditions.

 

Hardware Architecture & Under-the-Hood Logic

This relay uses a standalone onboard microprocessor with isolated voltage input stages. No external controller dependency, all supervision logic processed locally inside the unit.

  1. Three-phase VT voltage inputs route through high-isolation surge suppression and filtering.
  2. Analog front-end scales raw AC voltage for high-resolution ADC conversion.
  3. Onboard firmware compares each phase against adjustable over/under voltage thresholds.
  4. Phase sequence, frequency and loss-of-potential logic run continuous background checks.
  5. Output contacts activate for alarm or trip; all abnormal events logged with time stamp for review.

 

Field Service Pitfalls: What Rookies Get Wrong

Unfused VT Circuit FeedsTechs skip secondary VT fusing or use oversized fuses. Short circuits on wiring take out relay input boards with no upstream protection.

  • Field Rule: Install proper 1A VT secondary fuses at the panel; test fuse continuity after every cabinet outage.

Mismatched VT Ratio ProgrammingDefault relay settings rarely match site transformer ratios. Incorrect scaling leads to false undervoltage trips during normal operation.

  • Quick Fix: Confirm system VT ratio, input nominal voltage and setpoint curves before commissioning.

Poor Cabinet Airflow AccumulationStacked panel devices with zero side clearance trap radiant heat. Sustained high ambient temps drift trip thresholds over time.

  • Field Rule: Leave minimum 20mm side clearance; keep cabinet louvers and filter screens clear of dust buildup.

 

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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