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Description
Application Scenarios
At a nuclear auxiliary feedwater pump station in South Korea, regulatory auditors flagged single-point power vulnerabilities in the turbine trip system. The legacy power supplies lacked redundancy and failed silently during a simulated brownout. After retrofitting all Mark VIe racks with GE 8920-PS-DC-02 modules in 2+1 redundant configuration, the system passed rigorous SIL 3 validation with zero power-related faults during 72-hour stress tests. During an actual grid disturbance six months later, one supply failed—but the load seamlessly transferred to the remaining units without interrupting protection logic. The plant’s lead controls engineer stated: “The 8920-PS-DC-02 didn’t just meet compliance—it gave us confidence.” This real-world resilience highlights how power integrity directly enables functional safety.
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Technical Principles and Innovative Values
Innovation Point 1: True Hot-Swap with Zero Bus Disturbance – The 8920-PS-DC-02 features active current sharing and soft-start circuitry that prevents voltage droop or surge when inserting or removing units under full load—critical for live turbine operations.
Innovation Point 2: Integrated Health Monitoring – Continuously tracks input voltage, output current, internal temperature, and fan status (if equipped), reporting anomalies via a dry contact to the Mark VIe diagnostic bus for predictive maintenance.
Innovation Point 3: Optimized for IONet Stability – Ultra-low output impedance and high transient response ensure stable 24 VDC delivery during rapid I/O switching events (e.g., solenoid actuation), preventing communication glitches on the 8502-BI-DP bus interface.
Innovation Point 4: Global Compliance Out of the Box – Single model supports worldwide AC mains without jumper changes, simplifying spares management across international fleets.
Application Cases and Industry Value
A floating production storage and offloading (FPSO) vessel in the North Sea upgraded its gas turbine control system to Mark VIe, requiring power supplies that could withstand salt spray, vibration, and 24/7 operation. The GE 8920-PS-DC-02. with conformal coating and marine-grade components, has operated continuously for over 4 years with zero failures—despite ambient temperatures swinging from –10°C to +55°C. Maintenance logs show no unplanned outages linked to power issues, a stark contrast to the previous system’s quarterly failures.
In a U.S. Department of Energy microreactor pilot project, the 8920-PS-DC-02 was selected for its proven SIL 3 pedigree. During seismic testing (simulating 0.3g earthquake), it maintained regulation within ±0.5%—ensuring safety relays remained energized. Regulators cited its robust design as a key factor in granting operational approval.
Related Product Combination Solutions
GE 8500-RACK: Standard Mark VIe I/O chassis that houses the 8920-PS-DC-02 alongside I/O modules.
GE 8502-BI-DP: Bus interface module powered by 8920-PS-DC-02 for IONet communication.
GE VCMI-MKVIe: Main controller card dependent on clean 24 VDC from this supply.
GE 8512-DO: Digital output board driving trip solenoids—requires stable power during high-current pulses.
HIMA F35: In hybrid safety architectures where HIMA handles final elements and Mark VIe provides process control.
BENTLY NEVADA 3500/25: Vibration monitor often co-located in turbine cabinets, sharing the same 24 VDC rail.
Phoenix Contact QUINT4-PS/1AC/24DC/10: Third-party alternative for non-SIL applications (not recommended for SIS).
GE ToolboxST: Software used to monitor power supply health data reported via the Mark VIe network.
Installation, Maintenance, and Full-Cycle Support
Installing the GE 8920-PS-DC-02 requires insertion into a designated power slot in a Mark VIe rack with secure backplane engagement. For redundant setups, at least two units must be installed, and the system automatically balances load. Wiring involves only AC input and grounding—no external diodes or OR-ing modules needed thanks to integrated redundancy circuitry.
Routine maintenance includes visual inspection of status LEDs and periodic verification of output voltage under load. The module’s fault relay can be wired to a plant alarm panel for remote notification. Replacement takes under 3 minutes: release the latch, pull out the unit, and insert a new one—no system shutdown.
We supply only genuine GE 8920-PS-DC-02 units—new surplus or factory-refurbished—with full burn-in testing at 24 VDC/10 A for 48 hours, thermal imaging validation, and redundancy switchover simulation. Every unit is firmware-matched to Mark VIe releases and backed by a 12-month warranty. Our support team includes ex-GE field service engineers who provide commissioning guidance and failure analysis.
Contact us for a customized solution—whether you’re building a new combined-cycle plant or hardening an aging turbine control system, the GE 8920-PS-DC-02 ensures your safety logic never loses power.
