Racking Contactor Integrating Disconnect Switch
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Solution Overview
Problem
Existing electrical circuit protectors for power distribution centers, such as those used in underground mining, have a high parts count and physical size, which is undesirable for compact and reliable equipment, and lack integration of the contactor and disconnect/grounding switch, making them less efficient and more costly.
Innovation Solution
The integration of a contactor and switch contacts into a racking contactor design, which includes a carriage and switch actuator, reduces parts count and size by combining the functions of a contactor and disconnect/grounding switch into a single mechanism, with movable contacts for selective engagement, and uses flexible conductors for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate contactor and disconnect/grounding switch components are used, then functional reliability is maintained, but device complexity and parts count increase
Solution Approach 1:
The patent combines the contactor and disconnect/grounding switch into a single integrated racking contactor assembly. The contactor contacts and disconnect switch contacts are merged into one structural unit that performs both functions simultaneously, reducing the total number of separate components while maintaining the reliability of both functions through shared mechanical and electrical pathways.
Solution Approach 2:
The racking contactor assembly serves multiple functions: it acts as both a contactor for motor starting and a disconnect/grounding switch for circuit isolation. This multi-functional design eliminates the need for separate dedicated components for each function, thereby reducing device complexity while preserving functional reliability through unified operation.
2Volume of stationary object
If separate contactor and disconnect/grounding switch components are used, then functional independence is maintained, but physical size and manufacturing cost increase
Solution Approach 1:
The patent merges the contactor and disconnect switch into a single racking contactor assembly, significantly reducing the physical volume required compared to housing two separate components. This consolidation eliminates redundant structural elements, mounting spaces, and clearance requirements, thereby reducing overall device size and associated manufacturing costs.
Solution Approach 2:
By designing a multi-functional racking contactor that performs both contactor and disconnect switch functions, the patent reduces the total material requirements and manufacturing steps. The unified design allows for more efficient production processes and lower assembly costs compared to manufacturing and assembling separate components.
3Volume of stationary object
If integrated racking contactor design is used, then device compactness is improved, but functional integration complexity increases
Solution Approach 1:
The racking contactor assembly is segmented into distinct functional zones: the contactor contact section, the disconnect switch contact section, and the racking mechanism section. This segmentation allows each functional element to be designed and manufactured independently using standard components, then assembled into a compact integrated unit, thereby reducing the complexity of functional integration while maintaining device compactness.
Solution Approach 2:
The patent employs a nested arrangement where the disconnect switch contacts are positioned within or adjacent to the contactor contacts, and the racking mechanism is integrated into the same structural space. This nesting approach maximizes space utilization, achieving compactness without requiring complex external linkages or separate mounting structures.
4Productivity
If movable contacts are used for selective engagement, then operational efficiency is improved, but mechanical complexity increases
Solution Approach 1:
The racking contactor employs movable contacts that can dynamically engage and disengage based on operational requirements. The racking mechanism provides controlled linear motion to bring the movable contacts into engagement with their respective mating contacts, enabling efficient circuit making and breaking operations while using simple, reliable mechanical components.
Solution Approach 2:
The racking mechanism acts as an intermediary that translates rotational or linear actuation motion into the precise linear motion required for contact engagement. This intermediary mechanism simplifies the overall design by providing a single, well-defined motion path for the movable contacts, reducing mechanical complexity compared to direct actuation systems.
Data Source
AI summary
A disconnect mechanism, an electrical component assembly including the disconnect mechanism, and an electrical circuit protector in turn including the electrical component assembly. The disconnect mechanism includes a carriage, as well as a switch actuator connected to the carriage for moving the carriage between a switch-closed position and a switch-open position. A contactor is mounted to the carriage so as to move with the carriage, the contactor including first and second contactor terminals and providing selective electrical connection between the contactor terminals. A movable disconnect switch contact is connected to the first contactor terminal, and is movable with the carriage and the contactor. A fixed disconnect switch contact is positioned for selective engagement with the movable disconnect switch contact as the carriage moves to the switch-closed position.