Switching Device Degradation Detection via Release-to-Drive Timing
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Solution Overview
Problem
Existing low- and medium-voltage switching devices, such as circuit breakers, face challenges in monitoring the degradation of their control mechanisms due to aging, which can lead to safety and operational issues if not detected promptly.
Innovation Solution
A method for detecting degradation in switching devices by measuring the time elapsed between predetermined positions of the unlocking mechanism and drive element during successive actuations, using the electromagnetic actuator's current variations or position indicator signals, without requiring additional sensors, to track the evolution of the control mechanism's behavior over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional switching devices are used without monitoring, then device complexity is reduced, but reliability deteriorates due to undetected degradation from aging
Solution Approach 1:
The switching device monitors its own control mechanism degradation through built-in sensors that detect positions of existing components (unlocking mechanism, drive element). The system uses self-generated signals from normal operation without requiring external monitoring equipment, allowing the device to detect its own degradation state while maintaining simplicity.
Solution Approach 2:
Existing components in the switching device serve multiple functions: the unlocking mechanism and drive element are both operational components and sensing targets. The same mechanical parts that perform switching functions also provide positional information for degradation detection, eliminating the need for separate dedicated monitoring components.
2Measurement precision
If additional sensors are added to monitor control mechanism degradation, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system uses signals already present in the switching device (positions of unlocking mechanism and drive element during normal operation) to detect degradation. No external sensors or additional measurement equipment are required, as the device itself provides the necessary positional information through its operational components.
Solution Approach 2:
The positional relationship between the unlocking mechanism and drive element serves as an intermediary indicator of degradation. Instead of directly measuring degradation, the system monitors the time interval between positions of these components, which changes as degradation occurs, providing indirect but precise measurement of the degradation state.
3Reliability
If the control mechanism is monitored continuously, then reliability improves through early degradation detection, but loss of time for data processing increases
Solution Approach 1:
The system measures the time interval between the unlocking mechanism reaching its predetermined position and the drive element reaching its predetermined position during each actuation cycle. This periodic measurement during normal operation allows continuous monitoring without requiring separate continuous measurement systems, minimizing data processing time while maintaining reliability.
Solution Approach 2:
The system establishes a reference time interval when the control mechanism is new and compares subsequent measurements against this baseline. By having the reference value predetermined, the system can quickly assess degradation without complex real-time analysis, reducing data processing time while maintaining accurate fault prediction capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables early detection of degradation, allowing for timely maintenance or replacement, thereby preventing potential faults and ensuring the safety and reliability of the switching device.
Implementation Method 1
an actuator configured to move the release member from the locked position to the release position
Implementation Method 2
an elastic member linked to the drive element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6B
AI summary
A method is proposed for detecting a degradation of a switching device (30) comprising: - a movable electrical contact (10), - a control mechanism (4) comprising: -- a drive element (9) for the movable contact (10) -- an elastic element (7) linked to the drive element (9), -- a release element (8) configured to release the elastic element (7) so as to move the contact (10) in order to open an electrical circuit (50), - an actuator (1) configured to move the release element (8), the method comprising the steps: (i) controlling the actuator (1), (ii) determining a time interval (D) between a first instant (t1) corresponding to a predetermined position (P1) of the release element (8) and a second instant (t2) corresponding to a predetermined position (P2) of the drive element (9), (v) performing a series of successive commands of the actuator (1), so as to obtain a set (E) of values of the duration (D),(vi) determine a degradation of the unlocking element (8) of the switching device (30) from the evolution of the values of the assembly (E).