Description
- Product Model: IS215VPROH2B
- Manufacturer: GE
- System Platform: Mark VI Speedtronic
- Form Factor: 6U VME single-slot board
- Power Supply Voltage: 24 V DC nominal (typically from rack power supply), with wide tolerance for field variations
- Power Consumption: Low power design, typically under 20 W, minimizing thermal load in enclosed racks
- Operating Temperature Range: -30°C to +65°C (extended industrial rating suitable for turbine enclosure environments)
- Humidity Tolerance: 5% to 95% non-condensing, ensuring reliability in high-humidity power plant settings
- Trip Solenoid Outputs: Controls up to 3 independent trip solenoids via associated TREG terminal board relays
- Redundancy Architecture: Triple modular redundant (TMR) design with 2-out-of-3 voting logic for critical protection functions
- Input Channels: Supports analog speed inputs (typically from magnetic pickups) and discrete fault signals
- Response Time: Overspeed detection and trip initiation within milliseconds, critical for rotor overspeed prevention
- Relay Configuration: Interfaces with 12 relays on TREG board, 9 of which form three groups of voted trip contacts
- Communication Interface: VME backplane bus for integration with Mark VI controllers and IONet
- MTBF: High reliability rating typical of Mark VI protection hardware (>100,000 hours in continuous duty)
- Certifications: Compliant with relevant industrial standards including CE marking where applicable, designed for IEC 61508 SIL-capable applications in turbine safety
- Dimensions: Approximately 233 mm (H) × 160 mm (W) × 330 mm (D), standard VME form factor for rack compatibility
- Weight: Approx. 0.45 kg, allowing straightforward handling during module replacement
Technical Architecture & Functional Positioning
The IS215VPROH2B occupies a dedicated position in the protection layer of the Mark VI control architecture, functioning as an independent emergency protection subsystem separate from the primary control processors. It is mounted in the VME rack alongside controller modules but operates with its own dedicated logic to ensure fail-safe behavior even if main control paths are compromised. This separation is a fundamental safety principle in turbine controls, preventing common-mode failures from disabling overspeed or trip functions.
At its core, the board employs TMR architecture with three independent processing paths that continuously vote on speed signals, acceleration rates, and other critical parameters. Speed inputs (from passive or active magnetic sensors) are conditioned, processed through analog-to-digital conversion, and evaluated against programmable overspeed setpoints. If two out of three channels agree on a fault condition—such as rotor speed exceeding 110-115% nominal—the board de-energizes trip relays via the associated TREG terminal board. This voted output drives hydraulic trip solenoids or fuel shutoff valves, achieving rapid turbine shutdown. The design incorporates hardware watchdogs, power-on self-tests, and continuous diagnostics to detect internal faults, forcing a safe trip if anomalies are identified.
Engineering value lies in its ability to provide SIL-rated protection independent of software-based controls, addressing risks like processor hang-ups, IONet failures, or cyber-induced disruptions. In gas turbine applications, where overspeed can destroy rotors in seconds, this hardware-centric approach delivers deterministic response times and high availability. The board’s analog and thermocouple input support extends functionality to monitor bearing temperatures or vibration thresholds, enabling integrated emergency logic without relying solely on main controllers.
Typical Application Scenarios
- Deployed in heavy-duty gas turbine packages (e.g., Frame 7FA, 9FA) for primary overspeed and emergency trip protection, ensuring compliance with API 670 and NFPA standards.
- Used in combined-cycle power plants where Mark VI controls manage multiple turbines, providing dedicated backup protection during load transients or fuel system faults.
- Serves as direct replacement or upgrade component in legacy Mark V systems transitioning to Mark VI, maintaining identical trip logic and wiring interfaces.
- Applied in steam turbine generator sets for overspeed, low lube oil pressure, and thrust bearing protection, integrating with mechanical trip backups.
- Utilized in offshore or remote power generation installations requiring robust, standalone protection under harsh vibration and temperature conditions.
Quality Standards & Testing Procedures
In turbine protection systems, component integrity directly impacts personnel safety and asset preservation—an undetected failure can result in catastrophic overspeed events. We treat each IS215VPROH2B as mission-critical, applying a structured verification process derived from OEM guidelines and decades of field experience to eliminate risks from aging, contamination, or prior misuse.
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