Switchgear Shutter Latch for Safe Maintenance Hold-Open
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Solution Overview
Problem
During maintenance, the need to manually manage shutter plates in switchgear housings can lead to risks if tools are forgotten, potentially damaging circuit breakers or disabling shutter plate movement, posing hazards to maintenance personnel.
Innovation Solution
A latch mechanism with a hook-shaped element guided along a spring-loaded J-shaped guide is introduced, allowing manual blocking of shutter plate movement during maintenance and automatic self-resetting upon reinsertion of the circuit breaker, ensuring safe and functional operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tool is used to manually block the shutter plate during maintenance, then the shutter plate can be held open for maintenance access, but the tool may be forgotten and cause damage to circuit breakers or disable shutter plate movement
Solution Approach 1:
The latch mechanism is self-actuating through spring means that automatically return the hook-shaped element to the unlatched position when the circuit breaker is reinserted, eliminating the need for manual tool removal and preventing forgotten tools from causing damage
Solution Approach 2:
The hook-shaped latch element acts as an intermediary between the maintenance personnel's manual blocking action and the shutter plate, providing a dedicated blocking mechanism that is automatically reset by the spring means when the circuit breaker is reinserted
2Ease of operation
If the shutter plate is manually blocked during maintenance, then maintenance personnel can safely access the opening, but the automatic shutter operation is disabled until the block is removed
Solution Approach 1:
The latch mechanism automatically resets itself through spring means when the circuit breaker is reinserted, restoring normal shutter operation without requiring maintenance personnel to manually remove the blocking tool or perform additional reset actions
3Reliability
If a latch mechanism is added to enable automatic blocking, then operational safety is improved, but the device complexity increases
Solution Approach 1:
The latch mechanism is implemented as a localized hook-shaped element with spring means positioned at a specific location on the shutter plate, adding minimal complexity only where needed for safety blocking rather than redesigning the entire shutter system
Solution Approach 2:
Instead of using a complex locking mechanism that requires active engagement, the invention uses a spring-loaded hook element that passively engages with the shutter plate and automatically disengages when needed, inverting the traditional active-locking approach
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 latch mechanism ensures the shutter plates remain functional and safe, preventing damage to circuit breakers and maintaining operational safety by automatically resetting without manual intervention upon reinsertion, thus reducing risks to maintenance personnel.
Implementation Method 1
spring means for urging the hook-shaped element towards the unlatched position
Data Source
Figure 1
Figure 2~3A
Figure 3B~3C
AI summary
The invention relates to a switchgear housing for housing an object, such as a circuit breaker, the switchgear housing comprising: - a wall with an access opening for access to for example a high voltage connector; - at least one shutter plate movable parallel to the wall between a closed position, wherein the shutter plate covers the opening and an open position, wherein the shutter plate exposes the opening; - urging means for urging the at least one shutter plate towards the closed position; - an operating mechanism for operating the shutter plate from the closed position to the open position when an object such as a circuit breaker is moved into the housing; and - at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position, wherein the path of the latch and the path of the shutter plate intersect, such that the latch, in the latched position, blocks movement of the shutter plate from the open position to the closed position.