Contact Bridge Position Sensing for Weld Fault Detection
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Solution Overview
Problem
Existing electrical switching assemblies are unreliable due to failure to detect faults such as welding between contacts and the contact bridge, and determining the switching state is inefficient, especially when multiple switching elements are involved.
Innovation Solution
A switching assembly with a movable contact bridge and a detector system using sensor elements, such as Hall sensors, to accurately detect the bridging and separated positions, and a controller with two switching points to prevent false readings, ensuring reliable contact separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detector with at least one detector element is used to detect the presence of the contact bridge, then the switching state can be detected, but fault states such as welding between contacts and the contact bridge are not detected or are incorrectly declared
Solution Approach 1:
The detector is divided into multiple detector elements (first detector element and second detector element) positioned at different locations. Each detector element monitors a specific position of the contact bridge, allowing the system to detect not only the presence/absence of the contact bridge but also its intermediate positions, thereby identifying fault states such as welding that a single detector cannot detect.
2Measurement precision
If the switching state is determined by applying a voltage in the circuit and measuring the voltage drop across the contacts, then the contact state can be determined, but it requires closing other switching elements which is time consuming and inefficient
Solution Approach 1:
The detector elements continuously monitor the position of the contact bridge in real-time without requiring voltage application or closing of other switching elements. The system is prepared in advance with detector elements positioned to detect the contact bridge at all relevant positions, eliminating the need for time-consuming voltage application and measurement procedures.
3Reliability
If one switching element is examined while other switching elements remain closed, then the contact state can be measured, but the process becomes time consuming when multiple switching elements are involved
Solution Approach 1:
The detector elements autonomously detect the position of the contact bridge without requiring external voltage application or manual intervention to close other switching elements. The system serves itself by continuously monitoring the contact bridge position through the detector elements, enabling simultaneous examination of multiple switching elements without sequential operations, thereby significantly improving productivity.
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
The solution provides reliable detection of the contact bridge position, preventing false declarations of open or closed states and reducing the time and inefficiency in determining the switching state, ensuring accurate operation even under high-voltage and high-current conditions.
Implementation Method 1
A detector of the assembly includes at least one sensor for detecting the presence of the contact bridge in at least one of the separated position or the bridging position
Data Source
AI summary
A switching assembly comprises a pair of fixed contacts, and a contact bridge movable between a bridging position in which the contact bridge electrically connects the contacts and a separated position in which the contacts are electrically separated. A detector of the assembly includes at least one sensor for detecting the presence of the contact bridge in at least one of the separated position or the bridging position, and a controller operatively connected to the sensor and having a first switching point and a second switching point. One of the switching points is associated with a position of the contact bridge between the bridging position and the separated position.