Multi-Point Switch Contacts for High Short-Circuit Current
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Solution Overview
Problem
Existing switching devices often lack short-circuit strength, leading to destruction and rendering them unusable after a short-circuit event.
Innovation Solution
A switching device with at least two contact locations, each comprising a movable and a fixed contact, where one contact is formed as a socket and the other as a pin, and both contacts are designed with ribs to create multiple contact points, enhancing current conduction without welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a switching device uses a simple contact design, then the device complexity is low, but the short-circuit strength is insufficient leading to destruction after short-circuit events
Solution Approach 1:
The contact design is segmented into multiple contact points (at least two contact locations) instead of a single contact point. Each contact location includes a movable contact and a fixed contact, with one contact formed as a socket and the other as a pin. This segmentation distributes the mechanical and thermal stress during short-circuit events, preventing catastrophic failure while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention transitions from a single-point contact to a multi-point contact arrangement by adding spatial distribution in another dimension. The contact lamellae are arranged radially around the pin, creating multiple contact points in different spatial locations. This dimensional change allows the contact to withstand short-circuit forces better without significantly increasing structural complexity.
2Reliability
If a switching device uses a single contact point, then the contact structure is simple, but welding occurs during high current conduction
Solution Approach 1:
The contact structure is divided into multiple contact points (at least two contact locations) to distribute the current flow. This segmentation prevents localized overheating and welding at any single contact point, thereby improving reliability during high current conduction without requiring complex contact arrangements.
Solution Approach 2:
The contact lamellae are designed with specific local properties - they are arranged radially around the pin with defined spacing and orientation. This local quality optimization ensures that current is distributed evenly across multiple contact points, preventing welding while maintaining a simple overall contact structure.
3Reliability
If the contact surface area is increased to reduce contact resistance, then the current conduction capability is improved, but the actuating force required increases
Solution Approach 1:
The contact surface is segmented into multiple discrete contact points rather than a large continuous surface. This segmentation achieves effective current conduction through parallel current paths while allowing each individual contact point to be actuated with relatively low force, reducing the total actuating force requirement.
Solution Approach 2:
Instead of increasing contact surface area in a single plane, the invention distributes contact points in three-dimensional space around the pin (radial arrangement). This dimensional change provides sufficient current conduction capability while maintaining low actuating forces because each contact point remains small and easily actuated.
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
The solution enables the switching device to conduct high continuous currents up to 1000 A and very high short-circuit currents up to 30 kA without welding, while requiring only low actuating forces and maintaining stability against electromagnetic repulsive forces.
Implementation Method 1
a plurality of contact pieces (31) are riveted onto the contact webs (29)... enables the switching device to conduct high continuous currents up to 1000 A and very high short-circuit currents up to 30 kA without welding
Implementation Method 2
a resilient carrier strip (30) having two boundary flanges (28) and a plurality of contact webs (29) extending transversely to the boundary flanges (28) and connected to the boundary flanges (28)
Data Source
AI summary
Disclosed is a switching device having at least two contact locations wherein: each includes a movable contact and a fixed contact, one of the contacts being formed in a socket and the other contact being formed on a pin which can be received in the socket, and the movable contacts of both contact locations being in the form of a common component; one of the contacts at at least one of the contact locations has ribs, so that at the contact location a plurality of contact points is defined, the ribs being a separate component in the form of contact lamellae, and the contact lamellae being in the form of a high-current contact strip, which includes a resilient carrier strip having two boundary flanges and includes a plurality of contact webs, which run transversely to the boundary flanges and are connected to the boundary flanges.