Flexible Drive Shaft for Circuit Breaker Racking
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Solution Overview
Problem
The existing racking mechanisms for circuit breakers in switchgear cabinets are cumbersome and hazardous due to the need for heavy protective equipment and alignment of racking tools, which complicates efficient and safe disconnection and reconnection of circuit breakers, especially in energized systems.
Innovation Solution
A flexible connecting member links a drive mechanism with a rack engaging element, allowing the rack engaging element to be removably engaged with a racking mechanism and rotated to operate the racking mechanism without requiring the drive mechanism to be repositioned or aligned, enabling safer and less physically demanding operation of circuit breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rigid shaft and motor are used to drive the racking mechanism, then sufficient torque can be applied to operate the racking mechanism, but the device becomes heavy and cumbersome requiring alignment with the racking mechanism
Solution Approach 1:
The patent replaces the rigid shaft with a flexible drive shaft that can bend and flex to accommodate misalignment between the drive mechanism and the racking mechanism. This flexible connection allows the operator to engage the racking tool without precise alignment while still transmitting sufficient rotational torque to operate the racking mechanism effectively.
2Reliability
If heavy protective personal equipment is worn for safety, then operator protection is improved, but the operator's mobility and ease of operation are reduced
Solution Approach 1:
The patent replaces the manual screw-driven racking mechanism with an automated motor-driven system. The motor provides the necessary torque to operate the racking mechanism, eliminating the need for the operator to manually turn heavy handles or apply significant physical force. This substitution reduces the physical strain on operators wearing protective equipment while maintaining safety through controlled automated operation.
3Power
If an elongated rigid shaft is used to connect the motor to the racking mechanism, then torque can be transmitted effectively, but the device complexity and alignment requirements increase
Solution Approach 1:
The flexible drive shaft replaces the elongated rigid shaft, allowing torque transmission while accommodating angular and positional misalignment. This eliminates the need for complex alignment procedures and reduces the overall device complexity by removing alignment adjustment mechanisms and precision mounting requirements.
Solution Approach 2:
The flexible drive shaft introduces dynamic flexibility to the torque transmission system, allowing it to adapt to varying operational conditions and misalignments during engagement and operation, rather than requiring fixed precise alignment as a rigid shaft would demand.
Data Source
AI summary
Systems, devices and methods for racking circuit breakers in a switchgear cabinet include a drive mechanism that is flexibly linked to a racking mechanism associated with each circuit breaker. The drive mechanism can be connected for racking multiple circuit breakers without requiring re-positioning of the drive mechanism.