MOC Driver Spring Mechanism for Circuit Breaker Motion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern vacuum-operated circuit breakers face challenges with faster mechanism travel and reduced energy availability, which can lead to increased friction and reduced tolerance for sudden accelerations in older, retrofitted switchgear systems, necessitating an improved mechanism-operated cell (MOC) operator structure that slows down motion and ensures energy compatibility with the circuit breaker's operation.
Innovation Solution
The MOC operator structure incorporates a cam, follower, first lever, free-floating spring structure, and linkage system, where the cam drives the first lever to compress the spring, and the spring's force moves the cable and linkage structure, controlling motion and energy transfer to the breaker-panel interface, ensuring smooth operation and compatibility with the circuit breaker's energy constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If modern vacuum circuit breaker mechanism is used with faster travel and higher velocity, then circuit breaker operation speed is improved, but friction increases and tolerance for sudden accelerations decreases in older switchgear systems
Solution Approach 1:
The patent introduces an intermediary mechanism consisting of a cam, follower, and spring structure between the circuit breaker operating shaft and the MOC switch. This intermediary system converts the high-speed motion into controlled motion through mechanical multiplication and spring-mediated acceleration reduction, thereby protecting the older switchgear from excessive friction and sudden accelerations while maintaining compatibility with modern vacuum circuit breakers
Solution Approach 2:
The patent changes the motion parameters by using a cam profile designed to multiply travel distance while reducing velocity. The spring structure further modifies the acceleration profile by providing a gradual force application rather than sudden impulses, thus adapting the high-speed circuit breaker output to the lower-speed tolerance of legacy switchgear components
2Length of moving object
If motion multiplication is implemented to drive panel mounted components, then travel distance is improved, but energy consumption increases
Solution Approach 1:
The spring structure is pre-compressed during the cam rotation to store potential energy, which is then released to drive the MOC switch actuator. This preliminary energy storage allows the system to achieve the required travel distance multiplication without proportionally increasing energy consumption from the circuit breaker operating mechanism
Solution Approach 2:
The system uses dynamic motion multiplication where the cam profile and spring combination create a time-varying mechanical advantage. The mechanical advantage is highest when energy input is needed and lowest when energy output is delivered, optimizing the energy efficiency of the motion multiplication process
3Reliability
If MOC operator structure is added to provide redundant contacts, then reliability is improved, but device complexity increases
Solution Approach 1:
The cam-follower-spring mechanism serves multiple functions simultaneously: it multiplies motion distance, controls velocity, manages energy transfer, and provides the mechanical linkage for MOC switch actuation. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in overall device complexity despite the added reliability capability
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
This configuration slows down the motion of the mechanism, maintains energy compatibility, and minimizes adverse effects on the circuit breaker's performance, achieving a stable and efficient operation by controlling the energy transfer and motion, similar to the original air-magnetic breaker systems.
Implementation Method 1
a free-floating spring structure associated with the first lever... force of the spring structure moves the cable structure and thus the second lever
Implementation Method 2
a cam constructed and arranged to be coupled to the operating shaft of the circuit breaker, a follower in engagement with the cam
Implementation Method 3
due to the friction and inertia of system driven by the second lever, full motion of the cam and first lever is accomplished prior to any movement of the cable structure
Implementation Method 4
due to the friction and inertia of system driven by the second lever, full motion of the cam and first lever is accomplished prior to any movement of the cable structure
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A MOC operator structure for a vacuum circuit breaker includes a cam coupled to an operating shaft of the circuit breaker, a follower in engagement with the cam, a first lever coupled with the follower, free-floating spring structure associated with the first lever, a second lever, a linkage structure coupled with the second lever and constructed and arranged to be associated with a breaker-panel interface for moving auxiliary switches, and movable cable structure operatively coupled between the first and second levers. The first lever and spring structure are configured such that when the contacts are closed, movement of the cam via the operating shaft drives the first lever to a maximum position compressing the spring structure, prior to any movement of the cable structure, and wherein force of the spring structure moves the cable structure and thus the second lever, causing movement of the linkage structure.