IS200VTURH2B GE

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 (versus <3 ms on H1B) meets the most stringent turbine protection requirements.

• Highest Accuracy: ±0.002% reading (versus ±0.005% on H1B) ensures precise speed measurement for governor control and synchronization.

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

• Expanded Speed Range: 100,000 RPM maximum supports ultra-high-speed turbines and compressors.

• Expanded Sensor Support: Added variable reluctance sensor compatibility for flexible turbine installations.

• Acceleration-Based Overspeed Prediction: Predictive algorithm detects rapid acceleration and trips before mechanical overspeed occurs—provides an additional layer of protection.

• Self-Diagnostic Routines: Periodic internal self-tests verify hardware integrity—alerts if any fault detected.

• Speed Mismatch Detection: Compares all 3 channels—alerts if any channel deviates >1% (improved sensitivity) from median.

• Signal Quality Analysis: Monitors amplitude and waveform integrity for predictive maintenance.

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

• Captive Washer Terminals: Prevents screw loosening due to vibration.

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

• Direct Retrofit: Replaces all VTURH1A and H1B series boards with enhanced capabilities.

Application Fields

• High-Speed Gas Turbines: Overspeed protection for aero-derivative and high-frame turbines

• Steam Turbines: Overspeed protection for HP/IP/LP sections

• Generators: Grid synchronization speed, overspeed protection

• High-Speed Compressors: Speed monitoring for surge protection at >60,000 RPM

• Ultra-High-Speed Turbines: Applications requiring 50 kHz frequency response

• Turbo-Expanders: Speed measurement and overspeed protection

• Nuclear Power Plants: Safety-critical overspeed protection requiring <2 ms response

Comparison with H1B and Competitors

The GE IS200VTURH2B offers superior accuracy, faster response, expanded frequency range, and advanced predictive features compared to both its predecessor and competitors—making it the ideal solution for critical overspeed protection in the most demanding turbine applications.

Selection Guidelines

• When to choose: Any Mark VIe application requiring the highest level of overspeed protection—especially where <2 ms response, ±0.002% accuracy, or acceleration-based prediction is required.

• When to upgrade from H1B: Replace H1B boards with GE IS200VTURH2B when higher accuracy, faster response, acceleration prediction, or variable reluctance sensor support is beneficial.

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

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

• Scaling Configuration: Enter correct pulses per revolution (gear teeth count) in Toolbox ST for accurate RPM measurement.

• Trip Level Setting: Configure overspeed trip setpoint per turbine manufacturer specifications (typically 110–115% of rated speed).

• Acceleration Prediction Tuning: Configure acceleration threshold—predicts overspeed based on rate-of-change and trips early if acceleration exceeds safe limits.

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

• Compatibility: Fits all Mark VIe VME64x racks. Requires ControlST v7.0 or higher for full features (v6.5 operates in H1B compatibility mode).

Operational Precautions

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

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

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

4. Overspeed Testing: Perform simulated overspeed tests (function generator) to verify <2 ms response and trip logic.

5. Acceleration Prediction Testing: Simulate rapid acceleration events to verify predictive trip logic—critical for this advanced feature.

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

7. Speed Mismatch Testing: Introduce a known offset on one channel to verify mismatch alarm generation.

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

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

10. LED Diagnostics: Green = signal OK; Amber = marginal signal; Red = channel fault or overspeed condition. Refer to GEH-6855 for expanded blink codes (H2B specific).

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

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

13. Spare Stock: Maintain 1 spare per 3–4 racks; “H2B” backward-compatible with H1A/H1B sockets.

14. Annual Verification: Perform speed and overspeed tests during outages; document response times (<2 ms) and compare with baseline.

15. Firmware Updates: Ensure the GE IS200VTURH2B is in “standby” mode during updates. Use ControlST v7.0 or higher for full feature support.

16. ESD: Handle by edges only with grounded wrist strap.