Overspeed Protection Testing Interval Optimization
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Solution Overview
Problem
Current overspeed testing methods for powerplant machines are inefficient, as they require frequent manual adjustments and operate on a fixed schedule, leading to mechanical, electrical, and thermal stresses, and result in unnecessary energy consumption and delayed energy export.
Innovation Solution
A condition-based algorithm integrated with the operational control system of powerplant machines to monitor components and determine the optimal interval for overspeed protection system testing, reducing the frequency of tests and allowing adaptable methodologies such as shutdown or operating modes without tripping the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed interval periodic testing is performed, then the overspeed protection system is tested regularly, but mechanical, electrical, and thermal stresses increase and maintenance intervals decrease
Solution Approach 1:
The patent transitions from a static fixed-interval testing schedule to a dynamic condition-based testing approach. The testing interval is adjusted dynamically based on monitored component conditions, allowing the system to adapt the testing frequency to actual wear and operational states, thereby reducing unnecessary stress from frequent testing while maintaining protection reliability.
Solution Approach 2:
The patent changes the testing parameter from a fixed time interval to a variable interval based on monitored conditions. By monitoring parameters such as component wear, operational hours, and system responses, the testing interval is adjusted to optimize between reliability and stress reduction, implementing a parameter-based adaptive testing strategy.
2Reliability
If manual speed adjustment is performed for testing, then the overspeed protection system can be tested, but large mechanical, electrical, and thermal stresses are introduced on components
Solution Approach 1:
The patent replaces manual mechanical speed adjustment with an automated control system that electronically adjusts shaft speed. This substitution eliminates the need for manual intervention and allows for more precise, controlled speed increases that reduce mechanical shocks and thermal transients while still effectively testing the overspeed protection system.
Solution Approach 2:
The patent implements preliminary monitoring and assessment of system conditions before conducting the overspeed test. By pre-evaluating component states and preparing the system in advance, the testing can be performed more safely with reduced stress, and the system can be quickly restored to normal operation after testing.
3Reliability
If the powerplant machine operates at FSNL for testing, then the overspeed protection system can be tested, but revenue is not generated and fuel and electricity are consumed
Solution Approach 1:
The patent implements periodic condition monitoring during normal operation rather than requiring dedicated FSNL testing periods. By continuously or periodically monitoring system parameters during revenue-generating operation, the testing function is integrated into normal operation, eliminating the need to shut down energy export for testing purposes.
Solution Approach 2:
The patent makes the operational control system multi-functional by integrating both normal operation control and overspeed protection testing functions into a single system. This allows the system to perform testing during normal operation without requiring separate FSNL mode, thereby maintaining energy export capability while still testing protection systems.
4Reliability
If frequent testing is performed, then the overspeed protection system reliability is maintained, but the maintenance interval decreases
Solution Approach 1:
The patent implements a self-monitoring system that automatically tracks component conditions and determines when testing is necessary. This self-service approach allows the system to extend maintenance intervals by only testing when conditions indicate it is necessary, rather than following a fixed schedule that may be overly conservative.
Data Source
Figure 1
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Figure 3A
AI summary
Various embodiments of the present invention are operable to determine when to test an overspeed protection system of a powerplant machine (105, 145). As described herein, embodiments of the present invention may be applied to a wide variety of powerplant machines, each comprising a shaft (137). After determining that test of the overspeed protection system should be performed, embodiments of the present invention may allow for a variety of methods to test the overspeed protection system.