Scissor-Arm Switch Actuation for Safe High-Voltage Maintenance
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Solution Overview
Problem
Existing switch actuation mechanisms pose safety risks during maintenance by requiring technicians to operate near high voltage terminals, necessitating a solution that allows safe servicing without interrupting power delivery.
Innovation Solution
A mechanism using scissor arms actuated by a screw drive to transport switches between extended and retracted positions, ensuring electrical isolation and safe decoupling of high-voltage terminals, facilitated by a non-conductive path and battery-powered operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If technicians manually operate switches near high voltage terminals, then switch maintenance can be performed, but safety risks increase due to exposure to energized terminals
Solution Approach 1:
The patent introduces a scissor mechanism as an intermediary device between the technician and the high voltage terminals. This mechanism includes scissor arms that can be extended to reach the switch terminals while keeping the technician at a safe distance. The scissor mechanism acts as a mechanical mediator that transfers the actuation force from the technician's position to the switch terminals without requiring direct contact with energized components.
Solution Approach 2:
The patent segments the switch actuation function into two separate components: a scissor mechanism for reaching and actuating distant terminals, and a handle for local operation. This segmentation allows the technician to operate the handle locally while the scissor arms extend to perform the actual switching operation at the terminals, thereby separating the operator from the harmful high voltage environment.
2Productivity
If switches are kept in extended position for power delivery, then power can be continuously delivered, but maintenance access becomes difficult
Solution Approach 1:
The patent implements a dynamic scissor mechanism that can transition between extended and retracted positions. During normal operation, the scissor arms remain extended to maintain switch connectivity and power delivery. During maintenance, the scissor arms can be retracted to provide technicians with safe and easy access to the switch components. This dynamic positioning capability allows the system to adapt its configuration based on operational or maintenance mode.
Solution Approach 2:
The scissor mechanism is pre-configured in an extended position during normal operation to ensure continuous power delivery. Before maintenance begins, the mechanism can be preliminarily retracted to a safe position, preparing the system for maintenance activities without interrupting the overall power delivery through alternative pathways or sequential switching.
3Reliability
If scissor arms are used to reach terminals, then safe distance can be maintained, but mechanism complexity increases
Solution Approach 1:
The scissor mechanism is designed to be self-supporting and self-positioning through its geometric structure. The scissor arms naturally maintain their extended or retracted position through mechanical interlocking and friction, eliminating the need for complex motors, sensors, or control systems. The mechanism serves itself by using the mechanical advantage of the scissor geometry to maintain position and enable movement, thereby reducing overall system complexity while maintaining safety distance.
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 safe servicing of high-voltage switches by maintaining power delivery and preventing contact with energized terminals, reducing downtime and enhancing safety during maintenance.
Implementation Method 1
The drive is an electrical screw drive. The mechanism can include attachment points to couple with the switch.
Data Source
AI summary
An electrical connection is provided. An electrical connection apparatus includes a mechanism to transport a switch between a retracted position and an extended position. The mechanism includes multiple scissor arms. The mechanism includes a drive configured to receive power from a power source. The drive uses the power to extend the scissor arms to transport the switch to the extended position and retract the scissor arms to transport the switch to the retracted position.