GE IS200VTURH2BAB

Key Specifications

Advantages & Distinctive Features

• Redundant Speed Measurement: 3 independent channels with 2-out-of-3 voting logic—ensures trip integrity while preventing false trips.

• Ultra-Fast Response: <2 ms overspeed trip detection meets the most stringent turbine protection requirements.

• Highest Accuracy: ±0.002% reading ensures precise speed measurement for governor control and synchronization.

• Expanded Frequency Range: 50 kHz supports very high-speed turbines and finer gear tooth resolution.

• Acceleration-Based Overspeed Prediction: Predictive algorithm detects rapid acceleration and trips before mechanical overspeed occurs.

• Self-Diagnostic Routines: Periodic internal self-tests verify hardware integrity.

• Thicker Silicone Coating + Enhanced Edge Encapsulation: Superior protection against humidity, salt spray, chemicals, and condensing environments—suitable for offshore, Arctic, and chemical plants.

• Extended Temperature Range: –30 °C to +75 °C operation—suitable for extreme environments.

• 1000-Event Fault Log with waveform snapshots—enables comprehensive post-event analysis.

• Gold-Plated Captive Washer Terminals: Corrosion-resistant and vibration-proof connections.

• Hot-Swappable: No rack power-down for replacement.

• Direct Retrofit: Replaces all VTURH1A, H1B, H2B, and H2BAA series boards.

Application Fields

• High-speed gas turbines: Aero-derivative and high-frame turbines requiring <2 ms response

• Steam turbines: HP/IP/LP overspeed protection

• Ultra-high-speed compressors: >60,000 RPM applications

• Turbo-expanders: Speed measurement and overspeed protection

• Nuclear power plants: Safety-critical overspeed protection

• Offshore platforms: Salt-spray and condensing environments

• Arctic installations: Extreme cold (–30 °C) environments

• Desert power plants: Extreme heat (+75 °C) environments

• Chemical processing: Corrosive environments

Comparison with Competitors

The GE IS200VTURH2BAB offers unmatched accuracy, fastest response, expanded frequency range, advanced predictive features, and extreme-environment protection—making it the definitive choice for critical overspeed protection in the world’s most demanding turbine applications.

Selection Guidelines

• When to choose:

  • Critical overspeed protection requiring <2 ms response and ±0.002% accuracy

  • Ultra-high-speed turbines (>60,000 RPM, 50 kHz frequency)

  • Extreme environments (–30 to +75 °C, condensing, chemical exposure, salt spray)

  • Applications needing acceleration-based overspeed prediction

  • Maximum reliability (nuclear, critical infrastructure)

• Sensor Selection: Variable reluctance sensors provide improved high-frequency response for ultra-high-speed applications.

• Redundancy: Use all 3 channels with 2-out-of-3 voting for maximum protection integrity.

• Scaling: Enter correct pulses per revolution (gear teeth) in Toolbox ST.

• Trip Levels: Set per manufacturer spec (typically 110–115% of rated speed).

• Acceleration Prediction: Configure acceleration threshold to predict overspeed before mechanical limits are reached.

• Speed Mismatch Threshold: Default 1%—adjust based on sensor accuracy.

• Coating Verification: Inspect under UV (365 nm)—thicker silicone coating shows distinct fluorescence; verify enhanced edge encapsulation bead is continuous.

• Compatibility: Fits all Mark VIe VME64x racks. Requires ControlST v7.0 or higher for full features.

Operational Precautions

1. Wiring: Follow GEH-6855 diagrams—correct polarity and shield grounding essential. Use shielded twisted-pair cables; ground shield at terminal board only.

2. Sensor Gap: For proximity probes, verify air gap and bias voltage are correct.

3. Calibration: Verify speed reading against known reference (portable tachometer) during commissioning.

4. Overspeed Testing: Simulate overspeed with function generator to verify <2 ms response and trip logic.

5. Acceleration Prediction Testing: Simulate rapid acceleration events to verify predictive trip logic.

6. Voting Logic Test: Simulate single-channel failures to verify 2-out-of-3 logic.

7. Speed Mismatch Test: Introduce offset on one channel to verify alarm generation.

8. Self-Diagnostic Verification: Allow self-test to complete during commissioning—verify “SELF-TEST PASSED” in fault log.

9. Signal Quality Monitoring: Review amplitude trends in Toolbox ST—degrading amplitude indicates sensor/cable issues.

10. LED Diagnostics: Green = signal OK; Amber = marginal; Red = fault/overspeed. Refer to GEH-6855 for H2B-specific blink codes.

11. Fault Log: Access 1000-event log via Toolbox ST for post-event analysis.

12. Coating Care: Thicker silicone coating provides superior chemical resistance; use GE-approved silicone-safe cleaner. Inspect annually under UV—rework voids with approved silicone coating per GE FSB-MKVIe-112.

13. Hot-Swap: Remove/insert slowly under power—processor auto-recognizes new module.

14. Spare Stock: Maintain 1 spare per 3–4 racks; “H2BAB” backward-compatible with all VTURH sockets.

15. Annual Verification: Perform speed and overspeed tests during outages; document <2 ms response times.

16. Firmware Updates: Ensure the GE IS200VTURH2BAB is in “standby” mode during updates. Use ControlST v7.0 or higher.

17. ESD: Handle by edges only with grounded wrist strap—coating does not protect connectors.

18. Storage: Anti-static bag with desiccant at –40 to +85 °C; rotate every 3 years for coating inspection.