Description
- Product Model: IS220PPROH1A
- Manufacturer: GE
- System Platform: Mark VIe
- Power Supply Voltage: 28 V DC nominal (minimum 27.4 V DC recommended), with transient tolerance to ensure reliable protection during power disturbances.
- Power Consumption: Typically under 10 W, minimizing thermal load in protection racks.
- Operating Temperature Range: -30 °C to +65 °C, extended industrial grade for turbine control room or enclosure deployment.
- Storage Temperature Range: -40 °C to +85 °C, supporting long-term spare storage.
- Humidity Range: Up to 95% non-condensing, suitable for humid power generation environments.
- Communication Interfaces: Dual RJ-45 10/100 Mbps Ethernet ports for redundant IONet connectivity with deterministic protocol support.
- Speed Inputs: 3 channels for overspeed detection (typically magnetic pickup or passive sensors), with high-accuracy frequency measurement for rapid trip response.
- Accuracy: 0.05% of reading on speed inputs, critical for precise overspeed protection thresholds.
- Synchronization Check: Backup verification of generator phase, voltage, and frequency match to utility bus before breaker closure.
- Watchdog Functionality: Independent monitoring of primary controller health, triggering emergency trip on detected anomalies.
- Isolation Type: Galvanic isolation on inputs and trip paths to prevent noise propagation and ensure safety integrity.
- Mounting Type: Plugs onto protection terminal boards (e.g., IS200TPROH1C, IS200TREAH1A, IS200SPROH1A) via DC-37 connector, with vibration-resistant design.
- Environmental Protection: Conformal-coated PCB; certified for Class I, Division 2 hazardous locations (Groups A–D) in approved configurations.
- Certifications and Standards: Compliant with IEC 61000 EMC series, IEC 61508 SIL-capable elements, hazardous area approvals, and GE Speedtronic qualification for turbine protection.
- Mean Time Between Failures (MTBF): High (>200,000 hours typical for Mark VIe protection packs), supporting safety-critical continuous operation.
- Electromagnetic Compatibility (EMC): Meets industrial standards for immunity and emissions, essential in high-power turbine environments.
- Diagnostics: Continuous self-testing, speed input health, sync check status, watchdog timer, and Ethernet-based fault reporting via IONet.
Technical Architecture & Functional Positioning
The IS220PPROH1A serves as an independent backup protection layer in Mark VIe turbine control architectures, positioned parallel to the primary control system to provide fail-safe overspeed protection, synchronization verification, and watchdog supervision. It interfaces with dedicated protection terminal boards (e.g., TPROH or TREAH series), processes high-speed inputs from magnetic pickups or sensors, performs independent calculations for overspeed trip thresholds, and issues emergency trip commands via hardwired paths to the trip board. Data exchange occurs over redundant IONet Ethernet for status monitoring and alarm integration with the main controller.
Core technologies include precision frequency counters for speed inputs (achieving 0.05% accuracy), phase-angle comparators for synchronization checks, independent watchdog circuitry to detect primary control faults, and dual Ethernet interfaces enabling TMR configurations where three PPRO packs vote on protection decisions. The module operates autonomously for critical trip functions, ensuring protection availability even during primary controller anomalies.
These features address paramount turbine safety requirements: providing diverse, independent overspeed protection to prevent catastrophic runaway conditions, verifying safe synchronization to avoid out-of-phase breaker closure damage, and acting as a fail-safe watchdog to mitigate primary control failures. In TMR setups, the pack contributes to SIL-rated protection integrity, while continuous diagnostics enable predictive maintenance and reduce spurious trips.
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