Description
Product Introduction (Non-Templated)
Sudden grid frequency shifts or unmanaged voltage sags across industrial substations can destabilize heavy rotating equipment, resulting in costly emergency outages and uncoordinated system trips. Safeguarding critical electrical networks requires high-precision numerical relays capable of responding instantly to grid anomalies under aggressive industrial environments—which is precisely where this advanced protection module comes into play.
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Plant electrical engineers managing substation modernizations or generator protection upgrades rely on this specific numerical relay platform to secure reliable fault isolation. Integrating it into existing switchgear environments prevents nuisance tripping while delivering comprehensive event logs and real-time parameter tracking for long-term power system health.
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Key Technical Specifications
- Manufacturer: GE Multilin (General Electric)
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- Product Series: MIV II Digital Voltage & Frequency Relay
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- Control Power Supply (HI Version): 110–250 V DC / 110–230 V AC
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- AC Voltage Input Range: 10–250 V (50/60 Hz)
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- Protection Elements: Three-phase over/undervoltage, ground overvoltage, and frequency thresholds
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- Enclosure Architecture: 1/4 19-inch rack-mounted withdrawable structure (IP52 rated front panel)
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- Operating Temperature: -20 °C to +60 °C (-4 °F to +140 °F)
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- Communication Interface: Supports standard serial/fieldbus protocols for SCADA integration
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- Net Weight: ~2.7 kg (5.95 lb)
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MIVII1000E00HI00
Application Scenarios & Pain Points
When an unmonitored voltage drop occurs on a heavy industrial busbar during a major utility disturbance, uncoordinated motor protection schemes can drop upstream breakers and shut down an entire manufacturing facility.
- Power Generation Facilities: Deployed for comprehensive three-phase over/undervoltage and ground fault protection on large turbo-generators.
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- Substation Distribution Feeder Protection: Installed in switchgear lineups to monitor busbar voltage health and trigger automated transfer switches (ATS) safely.
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- Heavy Industrial Plants: Used across continuous process steel mills and chemical refineries to isolate sensitive motor drives from severe grid frequency fluctuations.
A large water treatment complex in the Midwest experienced intermittent plant-wide shutdowns caused by unverified voltage sags tripping legacy electromechanical relays. Installing this configurable GE Multilin digital relay allowed precise time-delay curve tuning, eliminating false trips and ensuring stability through severe weather events.
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Related Products
- GE Multilin SR735: Compact feeder protection relay for basic electrical distribution setups.
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- GE Multilin 339: Motor protection system sharing comparable software configuration environments.
- GE Multilin F650: Advanced digital feeder protection and control system for complex substation architectures.
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- GE EnerVista Setup Software: Dedicated configuration and diagnostic programming package used for setting relay parameters.
- GE Drawout Case Spare Chassis: Replacement physical housing framework designed to mount MIV II relays safely inside switchgear panels.
The Engineer’s Guide: Field Pitfalls to Avoid
- WARNING: Hot-Pulling the Drawout Core Without CT/VT Precautions. Yanking the relay core straight out of an active switchgear case without isolating potential transformers (VT) can introduce open-circuit safety hazards or data corruption. How to avoid: Always follow proper isolation procedures and verify that internal shorting fingers engage correctly before extracting the unit.
- WARNING: Mismatching Auxiliary Power Supply Ranges. Applying a low-voltage DC source to the high-range (“HI”) power supply terminals—or vice versa—prevents proper booting and risks internal component stress. How to avoid: Cross-reference your auxiliary control power schematic against the relay nameplate rating before energizing.
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- WARNING: Omitting VT Ratio Corrections in Software. Failing to input the exact potential transformer (VT) ratios into the configuration tool results in massive scaling errors during real-time voltage and frequency monitoring. How to avoid: Program your primary-to-secondary VT ratios accurately via the front interface or EnerVista software prior to putting the loop into service.
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Frequently Asked Questions (FAQ)
- Can I program and check event logs locally using the front panel interface?Well, technically the relay features an onboard display and navigation buttons allowing operators to view active alarms, check event recorder logs, and modify select settings directly on-site.
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- What does the withdrawable chassis design mean for routine maintenance? The relay uses a modular plug-in core that can be smoothly extracted from its permanent metal case housing without rewiring external panel terminals, drastically reducing mean-time-to-repair (MTTR) during testing.
- Does this specific part number support digital substation communication protocols?Yes, the MIV II series integrates communication architectures designed to interface cleanly with upper-level SCADA, DCS, or substation automation systems.
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- What type of documentation typically accompanies a surplus or refurbished unit? Reputable industrial automation suppliers provide static bench-test reports, hardware condition verification (such as new surplus), and a standard 12-month operational warranty.
- How can I verify if an internal trip was triggered by an overvoltage versus a frequency shift?Access the event recorder and waveform capture logs via the front interface or configuration software; the relay logs, timestamps, and categorizes every fault condition down to millisecond precision.
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