Motorized Disconnect Switch Lockout System
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Solution Overview
Problem
High voltage air break disconnect switches require a secure lockout mechanism to prevent accidental operation, especially when remote control systems fail, and existing mechanical locks are vulnerable to tampering and require manual intervention for maintenance.
Innovation Solution
A wireless remote control lockout system using a dedicated motor powered by the switch battery, with a locking lever that engages a gear to prevent rotation of the switch blade drive motor, and a magnet sensor to disconnect power when locked, allowing for secure operation and manual override if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical lockout mechanism is used, then the switch can be secured against operation, but the mechanism is vulnerable to tampering and requires manual intervention
Solution Approach 1:
The patent replaces traditional mechanical padlock systems with an electromechanical lockout mechanism controlled by a motor (120) that engages a locking lever (82) with a locking tooth (94) to prevent motor shaft (49) rotation. The system uses a magnet sensor (138) with magnet (137) to detect lockout status and automatically disconnect power to the drive motor (12), eliminating the need for manual padlock application and providing reliable, tamper-resistant lockout control.
2Reliability
If remote control operation is implemented, then operational safety is improved, but the risk of unauthorized or accidental operation increases
Solution Approach 1:
The patent implements a lockout mechanism that can be engaged before remote control operation to prevent unauthorized or accidental switching. The locking lever (82) with locking tooth (94) physically prevents motor shaft (49) rotation, and the magnet sensor (138) detects the locked state to ensure the switch cannot be operated remotely until unlocked, providing a preliminary safety barrier against harmful unauthorized operation.
Solution Approach 2:
The magnet sensor (138) provides real-time feedback on the lockout status by detecting the presence or absence of magnet (137) on the locking lever (82). This feedback automatically controls the power circuit to the drive motor (12), preventing remote operation when locked and enabling operation only when unlocked, thus eliminating the risk of unauthorized operation while maintaining remote control functionality.
3Reliability
If a lockout mechanism is added, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the lockout mechanism with the existing motorized drive system by integrating the locking lever (82) to directly engage the motor shaft (49) and using the magnet sensor (138) to automatically control power to the drive motor (12). This integration eliminates the need for separate mechanical lockout components and manual operation mechanisms, providing enhanced safety while minimizing additional complexity through functional consolidation.
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
Ensures safe and secure operation of high voltage disconnect switches by preventing accidental closure and allowing remote or manual lockout, enhancing safety and security by preventing unauthorized operation.
Implementation Method 1
A magnet on the locking lever actuates a magnet sensor switch when the locking lever is in the locked position which disconnects power to the drive motor.
Data Source
AI summary
A communication system controlled motorized in-line high voltage air break disconnect switch with a lock out system including a communication device remote controlled lock out. Also a mechanical lock out is provided if a battery that powers the remote controlled lock out is not functioning or other unforeseen problems cause a failure of the switch or the remote controlled lock out to operate. The remote controlled lock out when operative can prevent the switch from operating the motor when the remote controlled lock out is actuated. The motorized switch typically includes the motor having a worm drive shaft carrying a hookstick eye ring. The remote controlled lock out includes a locking gear mounted on the drive shaft. A lockout lever having a locking tooth is provided that engages or disengages the locking gear when appropriately actuated by the remote control to lock or unlock the switch blade drive motor.