Dual Power Transfer Switch Interlock for Safe Manual Maintenance
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Solution Overview
Problem
Dual power transfer switches in power distribution cabinets face safety risks due to complex operations and user errors during manual mode, where users cannot visually verify the states of internal components, leading to potential wrong operations and safety hazards.
Innovation Solution
The implementation of interlock devices, including a contact main shaft interlock device and a charging main shaft interlock device, which selectively lock or unlock the contact and charging main shafts using electromagnetic actuators and link mechanisms, restricting user operations to prevent unsafe states and ensure safe maintenance procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dual power transfer switch operates in manual mode to allow user input via operation interfaces, then the device can perform maintenance operations, but the user cannot visually verify the states of internal components leading to potential wrong operations
Solution Approach 1:
The patent implements a visual feedback mechanism where the position of the contact main shaft (first closed position, second closed position, or open position) is displayed to the user through the operation interface. This allows users to verify the actual state of internal components before performing maintenance operations, eliminating the risk of wrong operations while maintaining manual operation capability.
Solution Approach 2:
The patent introduces an intermediary display mechanism that translates the internal state of the contact main shaft into visible information for the user. This intermediary layer bridges the gap between the user and the internal components, allowing safe manual operation without direct visual access to the mechanical parts.
2Ease of repair
If the contact main shaft locking device is always accessible for manual operation, then maintenance can be performed, but unsafe operations can occur when the shaft is not in the open position
Solution Approach 1:
The patent implements a preliminary anti-action mechanism where the contact main shaft interlock device prevents the locking device from being actuated unless the contact main shaft is already in the open position. This preliminary prevention eliminates the possibility of unsafe maintenance operations before the shaft is properly positioned.
Solution Approach 2:
The system requires the contact main shaft to be in the open position (a preliminary condition) before the locking device becomes accessible for manual operation. This preliminary action ensures that the system is in a safe state before maintenance operations can commence.
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 interlock devices enhance the safety and reliability of dual power transfer switches by preventing user errors during maintenance, ensuring that switches are properly set before removal from the cabinet and maintaining continuous power supply to critical loads.
Implementation Method 1
the first actuator comprises a first electromagnetic actuator. A first actuating link of the first electromagnetic actuator is configured to move the locking link into or out of engagement with the locking link in response to an input to the first electromagnetic actuator
Implementation Method 2
the second actuator comprises a second electromagnetic actuator, a second actuating link of the second electromagnetic actuator being configured to move the first interlock link in response to an input to second electromagnetic actuator
Data Source
AI summary
A dual power transfer switch includes a contact system, which has a contact main shaft rotatably arranged to move contact assemblies. The contact main shaft has a first closed position, a second closed position, and an open position. At the first closed position, the contact assemblies connect a first power source to a load. At the second closed position, the contact assemblies connect a second power source to the load. At the open position, the contact assemblies disconnects from the load. The dual power transfer switch also includes a contact main shaft locking device configured to keep the contact main shaft at the open position. The contact main shaft locking device includes a locking link and a first actuator. The dual power transfer switch includes a contact main shaft interlock device.