Compact Recloser With Mechanical Operation and Erosion Sensing
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Solution Overview
Problem
Existing circuit interrupting devices, such as reclosers, lack efficient mechanisms for mechanically opening and closing without electrical assistance, and do not provide clear indicators of their operational state, which can complicate maintenance and operation.
Innovation Solution
A recloser design incorporating a handle for mechanical operation, an actuator with a plunger and single coil for contact control, and external indicators showing open and closed positions, along with position sensors and a controller for detecting contact erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a recloser uses electrical assistance for opening and closing operations, then the operation speed and reliability are improved, but the device cannot operate during power outages and requires additional electrical components
Solution Approach 1:
The recloser is divided into separate functional modules: a mechanical operation system (handle, linkage assembly) for manual opening/closing, and an electrical actuator system (coil, plunger) for automated reclosing. This segmentation allows each system to operate independently, enabling mechanical operation during power outages while maintaining electrical automation capability when power is available.
Solution Approach 2:
The linkage assembly is designed to translate rotational motion of the handle into linear motion of the plunger through pure mechanical means, without requiring electrical power. This self-service mechanical system ensures the recloser can be operated manually during power outages or for maintenance purposes.
2Ease of operation
If the recloser lacks external indicators, then the device structure is simpler, but the operational status cannot be clearly determined
Solution Approach 1:
The external indicator uses color-coded display portions (first display portion for closed position, second display portion for open position) to provide clear visual status indication. This allows operators to quickly determine the operational state of the recloser without complex instrumentation or electronic displays.
Solution Approach 2:
The linkage assembly serves as a mechanical intermediary that connects the internal plunger movement to the external indicator display. As the plunger moves between open and closed positions, the linkage assembly translates this motion to move the second display portion relative to the first display portion, providing external visibility of internal state changes.
3Measurement precision
If position sensors are added to detect contact erosion, then the measurement precision and maintenance efficiency are improved, but the device complexity increases
Solution Approach 1:
Position sensors are integrated into the sensor board to detect the position of the plunger and provide feedback signals to the controller. By monitoring plunger position over time, the system can detect changes that indicate contact erosion, enabling predictive maintenance before failure occurs.
Solution Approach 2:
The sensor board serves multiple functions: it detects plunger position for operational status monitoring, detects contact erosion through position analysis, and provides data for maintenance scheduling. This multi-functionality reduces the need for separate dedicated sensors for each measurement task.
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 mechanical operation without electrical assistance, provides clear operational status indication, and allows for detection of contact erosion, enhancing maintenance efficiency and reliability.
Implementation Method 1
an actuator including a plunger coupled to the second contact for closing and opening the circuit interrupter and a single coil used for driving the plunger
Data Source
AI summary
A recloser including a circuit interrupter having a first contact and a second contact movable relative to the first contact between a closed position, which allows current to pass through the circuit interrupter, and an open position, which separates the contacts and prevents current from passing through the circuit interrupter. The recloser further includes an actuator coupled to the circuit interrupter, the actuator including a plunger coupled to the second contact for closing and opening the circuit interrupter. The recloser further includes a sensor board including a first position sensor and a second position sensor, the first and second position sensors configured to generate signals indicative of a position of the plunger. The recloser further includes a controller configured to determine a velocity of the plunger based on a first signal generated by the first position sensor and a second signal generated by the second position sensor.