Technical Specifications

Main Features and Advantages

Millisecond-Precision SOE Recording
The defining capability of the Westinghouse 5X00357G04 is its ability to timestamp digital events with 1-millisecond resolution. The module samples each of its 16 channels at a high frequency (125 µs typical) and logs every state change to an internal event buffer with a timestamp synchronized to the Ovation system clock via IRIG-B or NTP . In turbine trip investigations, this precision enables engineers to sequence events accurately—for instance, determining whether protective relay A activated 37 milliseconds before relay B, providing objective forensic evidence for root cause analysis .

Integrated 48VDC On-Card Excitation and Robust Isolation
The 5X00357G04 includes a built-in 48VDC auxiliary power source for dry contact field circuits, eliminating the need for external excitation supplies and simplifying wiring in remote marshalling cabinets . This design reduces potential failure points and streamlines installation. The module also provides 1500VAC galvanic isolation between field inputs and the system logic, ensuring that high-voltage transients from switchyard equipment do not propagate to the DCS backplane, a critical safety feature when monitoring circuit breaker status in high-voltage substations .

Intelligent Filtering and Reliability for Critical Monitoring
The Westinghouse 5X00357G04 incorporates advanced signal conditioning to handle real-world electrical noise. Each channel includes a configurable 4ms debounce filter to suppress contact bounce from mechanical relays and breakers. A sophisticated jitter counter monitors rapid state changes; if four transitions are detected within a short interval (indicating contact chatter), the module temporarily suspends logging to prevent buffer overflow, resuming automatically when the signal stabilizes . This ensures that SOE records contain genuine events rather than noise-generated spurious entries.