Switchgear Pole Shaft Angle Diagnosis
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Solution Overview
Problem
The 'grenade' mechanism in existing high-power switching devices can malfunction over time due to sagging springs and increased mechanical friction, leading to incomplete closure of contacts and potential electric arcs, posing a risk to the circuit breaker.
Innovation Solution
A diagnostic method is developed to evaluate the mechanical performance of the switching device by measuring the angle of rotation of the pole shaft during contact closure, determining specific values from these measurements, and comparing them to initial operating gauges to diagnose mechanical wear and excess energy levels in the drive mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 'grenade' mechanism is used to ensure complete closure and locking of contacts, then reliability of contact closure is improved, but mechanical wear and energy loss increase over time leading to malfunction
Solution Approach 1:
The method performs preliminary diagnostic measurements of the pole shaft rotation angle during closing operations to detect wear and energy loss before they cause complete malfunction. By monitoring the rotation angle parameter over time, the system can identify degradation trends and schedule maintenance before the 'grenade' mechanism fails, extending its effective service life while maintaining reliable contact closure.
Solution Approach 2:
The invention implements a feedback mechanism by measuring and recording the pole shaft rotation angle during each closing operation, comparing it against reference values, and diagnosing the mechanical state based on deviations. This continuous monitoring provides feedback on the health of the 'grenade' mechanism, allowing for predictive maintenance that preserves both reliability and operational duration.
2Reliability
If spring tension is increased to overcome mechanical friction and ensure complete closure, then contact closure reliability is improved, but energy consumption and mechanical stress increase
Solution Approach 1:
Instead of increasing spring tension, the method changes the diagnostic parameter being monitored from force/energy measurements to rotational angle measurements. By measuring the pole shaft rotation angle and comparing it to reference values, the system can detect insufficient closure due to friction or spring sag without requiring additional energy input. This allows for diagnosis and corrective action without increasing energy consumption during normal operation.
3Loss of energy
If mechanical friction is reduced through lubrication and maintenance, then energy loss is decreased, but complexity of maintenance increases
Solution Approach 1:
The invention replaces direct mechanical intervention (disassembly, lubrication, physical inspection) with a non-contact diagnostic approach using rotational angle measurement. By monitoring the pole shaft rotation angle electrically, the system can detect increased friction and energy loss without requiring physical access to the friction points, thereby reducing maintenance complexity while still achieving energy loss detection and management.
4Reliability
If the toggle mechanism is designed for robust locking, then contact locking reliability is improved, but the risk of incomplete closure due to dead point failure increases
Solution Approach 1:
The method performs preliminary diagnostic measurement of the pole shaft rotation angle to verify that the toggle mechanism has successfully passed its dead point and achieved complete closure before considering the operation successful. By monitoring the rotation angle throughout the closing process, the system can detect incomplete closure due to dead point failure and trigger appropriate corrective actions, preventing the hazardous unlocked closed state that could lead to electric arcs.
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
This method effectively diagnoses mechanical wear and energy levels in the switching device, preventing incomplete closure and reducing the risk of electric arcs by accurately assessing the mechanical performance and energy storage capabilities.
Implementation Method 1
at least one elastic device for movement of the support arm for the movable contact towards the closed position
Data Source
Figure 1
Figure 2~4
Figure 5A~5B
AI summary
The method involves measuring a rotation angle of a pole shaft (20) during closing travel of electric contacts (12, 14). Two specific values are reconstituted from measurements. The specific values are compared with a specific initial operating reference of a switchgear device (10). Mechanical wear performances of a drive mechanism (22) are diagnosed based on a comparative state between the specific values obtained and specific values of the operating reference. A latching state of a toggle device (26) of the drive mechanism of the pole shaft is diagnosed according to an angular difference. An independent claim is also included for a switchgear apparatus.