Vacuum Switch Drive Geometry for Faster Contact Closure
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Solution Overview
Problem
Existing medium-voltage electrical switches experience kinetic energy loss during the transition from the closed to open position due to interference with the drive element of the vacuum bulb, which slows down the moving contact and affects performance characteristics like short-circuit closure.
Innovation Solution
A switching device with a movable element featuring a conductive blade and insulating support with curved drive surfaces that minimize kinetic energy loss by optimizing the contact between the drive element and the support, allowing for faster circuit closure without increasing the energy of the control mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moving contact engages with the drive element during the closing stroke, then the vacuum bulb can be actuated, but the moving contact speed is reduced due to kinetic energy transfer
Solution Approach 1:
The drive surface of the support and the receiving surface of the drive element are both designed with curved shapes. This curvature allows for optimized contact geometry that minimizes kinetic energy loss during the transfer from moving contact to drive element, thereby maintaining higher moving contact speed while still reliably actuating the vacuum bulb.
Solution Approach 2:
The invention changes the geometric parameters of the contact surfaces by designing them with specific curved profiles. This parameter optimization ensures that the kinetic energy transfer is minimized, allowing the moving contact to maintain its speed while still providing sufficient force to actuate the drive element and vacuum bulb.
2Speed
If the control mechanism energy is increased to improve closing speed, then the closing performance improves, but other operational phases like opening or grounding are negatively affected
Solution Approach 1:
The invention converts the previously harmful kinetic energy loss into a beneficial optimized energy transfer. By designing curved contact surfaces, the kinetic energy that was previously lost is now efficiently transferred to actuate the vacuum bulb, improving closing performance without needing additional control mechanism energy.
Solution Approach 2:
By optimizing the geometric parameters of the drive surfaces, the system achieves better energy utilization during the closing stroke. This allows the existing control mechanism energy to be used more effectively, improving closing speed without compromising the energy available for other operational phases.
3Ease of operation
If a retractable subsystem is used to move the vacuum bulb's moving electrode, then the switch can operate, but the contact speed is slowed down due to energy transfer to the retractable subsystem
Solution Approach 1:
The curved drive surfaces are designed to work in conjunction with the retractable subsystem, optimizing the interaction between the moving contact and the drive element. This curvature minimizes the energy absorbed by the retractable subsystem, allowing it to perform its function while causing minimal deceleration to the moving contact.
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 device improves performance by reducing kinetic energy loss during the closing stroke, enhancing short-circuit closure without modifying the control mechanism, thus maintaining or improving other operational phases like opening or grounding.
Implementation Method 1
the shape of the support's drive surface and the shape of the drive element's receiving surface minimize the kinetic energy loss experienced by the moving element, thus preventing excessive deceleration of the moving element during the main circuit closing stroke
Data Source
Figure 1
Figure 2A~2F
Figure 3(A)~3(D)
AI summary
A switching device (50) is proposed for an electrical appliance (100), comprising: - a vacuum bulb (3), - a drive element (4) connected to the vacuum bulb (3), - a movable element (20) that can be moved between a closed position of an electrical circuit and an open position of the circuit, and comprising: -- an electrically conductive blade (11), -- a support (12) integral with the blade (11), the movable element (20) being configured to: - during a circuit opening stroke, drive the drive element (4) via the conductive blade (11), and - during a closing stroke, drive the drive element (4) via the support (12). The support (12) includes a drive surface (14) in contact with a receiving surface (7) of the drive element (4) during a circuit closing stroke.The training surface (14) of the support (12) and the receiving surface (7) of the training element (4) are convex in shape.