Flexible Conductor Threaded Connection for Circuit Breaker Contacts
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Solution Overview
Problem
Existing circuit-breaker pole parts face challenges in accommodating flexible conductors for high nominal currents due to the limited diameter of movable electrical contacts, preventing secure attachment and efficient mechanical connection for high current applications.
Innovation Solution
A flexible conductor with an inside thread at one end is screwed onto an outside thread on the distal end of the movable lower electrical contact, allowing for a secure mechanical connection and enabling the use of thicker conductors for high nominal currents, along with additional securing mechanisms like washers or screw-nuts for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flexible conductor is attached to the movable electrical contact using screwing elements, then a secure mechanical connection is achieved, but the diameter of the movable electrical contact becomes insufficient for high nominal currents
Solution Approach 1:
The invention transitions from a two-dimensional attachment problem (surface mounting on the contact) to a three-dimensional solution by utilizing the longitudinal axis of the movable electrical contact. The threaded rod extends along the length of the contact, allowing the flexible conductor to be secured through a three-point attachment system (two clamping elements at opposite sides and the threaded rod providing longitudinal stability), thereby accommodating thicker conductors for high nominal currents while maintaining secure mechanical connection.
2Quantity of substance
If the flexible conductor is made thicker to handle high nominal currents, then current carrying capacity increases, but the conductor cannot be attached to the small diameter movable electrical contact
Solution Approach 1:
The invention segments the attachment system into distinct functional components: a threaded rod for longitudinal positioning, two clamping elements for lateral securing, and the flexible conductor itself. This segmentation allows each component to be optimized independently - the threaded rod provides precise positioning along the contact length, while the clamping elements provide secure lateral attachment, enabling the use of thicker conductors without compromising attachment feasibility.
3Stability of the object's composition
If screwing elements are used to attach the flexible conductor, then mechanical stability is improved, but through holes are required in the conductor which complicates the design
Solution Approach 1:
Instead of creating holes in the flexible conductor to insert screwing elements (conductor-modifying approach), the invention inverts the approach by having the threaded rod and clamping elements attach to the external surface of the movable electrical contact (contact-modifying approach). This inversion eliminates the need for holes in the conductor, maintaining mechanical stability through external clamping while preserving the conductor's structural integrity and simplicity.
Data Source
AI summary
The disclosure relates to a pole part of a circuit-breaker arrangement having an insulation housing for accommodating a vacuum interrupter containing a pair of corresponding electrical switching contacts, wherein a fixed upper electrical contact is connected to an upper electrical terminal molded or assembled in the insulation housing and a movable lower electrical contact is connected to the insulating housing by a support plate of the insulation housing via a flexible conductor that includes a first end for attaching the flexible conductor to the lower electrical terminal and a second end for attaching the flexible conductor to the movable lower electrical contact. The second end of the flexible conductor is provided with an inside thread which is screwed to an outside thread arranged on the distal end of the movable lower electrical contact.