Equipotential Contact Switches for Short-Circuit Arc Prevention
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Solution Overview
Problem
Existing electric power switches struggle to withstand short-circuit currents without being damaged or destroyed, leading to potential explosions and significant damage to installations and equipment.
Innovation Solution
The introduction of an equipotential connecting member that maintains the fixed and movable contacts at the same electric potential during short-circuit events, preventing the formation of electric arcs and ensuring the switch remains operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switches are used to withstand short-circuit currents, then the switch may be destroyed or damaged by electrodynamic repulsion forces and thermal heating, but increasing the switch's robustness increases material usage and cost
Solution Approach 1:
The patent introduces an equipotential connecting member that electrically connects the fixed contact and movable contact, maintaining them at the same electric potential during short-circuit events. This prevents potential differences that would cause electric arcs, thereby protecting the switch from thermal damage without requiring excessive material for robustness
Solution Approach 2:
The equipotential connecting member acts as an intermediary element between the fixed and movable contacts. It provides a controlled electrical connection path that manages the short-circuit current flow and maintains equipotential conditions, preventing direct arc formation between contacts while using minimal material
2Stability of the object's composition
If contact pressure springs are used to prevent contact separation during short-circuit, then contact stability improves, but the switch becomes more complex and requires greater maneuvering effort
Solution Approach 1:
By maintaining the fixed and movable contacts at the same electric potential through the equipotential connecting member, the patent eliminates the need for excessive contact pressure to prevent arcing. The equipotential connection provides inherent stability during short-circuit events without requiring complex spring mechanisms
Solution Approach 2:
The patent extracts the essential function of maintaining contact stability from the complex pressure spring system and achieves it through the simpler equipotential connecting member. This reduces device complexity while maintaining contact stability during short-circuit conditions
3Reliability
If robust pressure springs are used to maintain contact pressure during short-circuit, then contact separation is prevented, but manufacturing cost and material usage increase
Solution Approach 1:
The equipotential connecting member provides a cost-effective solution by using electrical potential equalization rather than mechanical pressure to maintain reliable contact connection during short-circuit. This approach is simpler and less expensive to manufacture than robust pressure spring systems
Solution Approach 2:
The patent changes the fundamental parameter from mechanical contact pressure to electrical potential equality. By controlling the electrical parameter (potential difference) rather than the mechanical parameter (contact pressure), the system achieves reliable connection with reduced manufacturing complexity and cost
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 solution effectively increases the switch's ability to withstand short-circuit currents, preventing damage and allowing downstream protection devices sufficient time to interrupt the short-circuit, thereby reducing the risk of explosions and equipment failure.
Implementation Method 1
the equipotential connecting member is configured to press against the fixed contact and/or the movable contact in the closed position of the switch... maintaining the fixed and movable contacts at the same electric potential during short-circuit events, preventing the formation of electric arcs
Implementation Method 2
At the initial moment of a short-circuit, when the electric current begins to flow through the fixed contacts and to be distributed across the moving contacts, the electrodynamic repulsive forces (Fr) can sometimes be much greater than the force exerted by the contact pressure springs (Fp)
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3B
AI summary
The invention refers to a switch capable of withstanding short-circuit currents without being destroyed or deteriorated by the passage of such high currents. The switch comprises: at least one fixed contact and at least one movable contact, wherein the movable contact is displaceable between a closed position of the switch in which the fixed and the movable contacts are electrically connected, and an open position of the switch in which the fixed and movable contacts are separated. The switch comprises at least one equipotential connecting member electrically connecting the fixed contact and the movable contact in the closed position of the switch, such that the fixed and the movable contacts are at the same electric potential, and wherein at least a part of the equipotential connecting member is pressed against the fixed contact and/or the movable contact in the closed position of the switch.