GE IS200VTURH1B

Key Specifications

Advantages & Distinctive Features

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

• Faster Response: <3 ms overspeed trip detection (versus <5 ms on H1A) meets the most stringent API 670 requirements.

• Higher Accuracy: ±0.005% reading (versus ±0.01% on H1A) ensures precise speed measurement for governor control and synchronization.

• Expanded Sensor Support: Added hall-effect sensor compatibility for flexible turbine installations.

• Wider Frequency Range: 30 kHz maximum supports higher-speed turbines and finer gear tooth resolution.

• Speed Mismatch Detection: Compares all 3 speed channels—alerts if any channel deviates >2% from the median, indicating sensor or wiring issues.

• Signal Quality Analysis: Monitors amplitude and waveform integrity for predictive maintenance—detects degraded sensors before failure.

• Captive Washer Terminals: Prevents screw loosening due to vibration—essential for turbine control cabinets.

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

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

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

Application Fields

• Gas Turbines: Overspeed protection, speed measurement for governor control, acceleration monitoring

• Steam Turbines: Overspeed protection, speed measurement for synchronization, zero-speed detection for turning gear

• Generators: Speed measurement for grid synchronization, overspeed protection

• Compressors: Speed monitoring for variable-speed drives and surge protection

• Diesel Engines: Speed measurement and overspeed protection for emergency generators

• High-Speed Turbines: Applications requiring 30 kHz frequency response

Comparison with H1A and Competitors

The GE IS200VTURH1B offers superior accuracy, faster response, expanded diagnostics, and enhanced sensor support compared to both its predecessor and competitors—making it the ideal solution for critical overspeed protection in demanding turbine applications.

Selection Guidelines

• When to choose: Any Mark VIe application requiring reliable speed measurement and overspeed protection—especially where <3 ms response or ±0.005% accuracy is required.

• When to upgrade from H1A: Replace H1A boards with GE IS200VTURH1B when faster response, higher accuracy, speed mismatch detection, or hall-effect sensor support is beneficial.

• Sensor Selection: Verify field sensors are compatible. Hall-effect sensors provide improved noise immunity for electrically noisy environments.

• 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).

• Speed Mismatch Threshold: Default 2% deviation—adjust based on sensor accuracy and installation conditions.

• Compatibility: Fits all Mark VIe VME64x racks. Requires ControlST v6.5 or higher for full features.

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 (e.g., portable tachometer) during commissioning.

4. Overspeed Testing: Perform simulated overspeed tests (function generator) to verify <3 ms response and trip logic.

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

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

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

8. LED Diagnostics: Green = signal OK; Amber = marginal signal; Red = channel fault or overspeed condition.

9. Fault Log: Access 750-event log via Toolbox ST for post-event analysis.

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

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

12. Annual Verification: Perform speed and overspeed tests during outages; document response times.

13. Firmware Updates: Ensure the GE IS200VTURH1B is in “standby” mode during updates.

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