Switching System Arc Quenching and Contact Pressure
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Solution Overview
Problem
Existing switching systems for high DC voltages and currents face challenges in safely interrupting and isolating electrical currents without causing damage due to arc formation, particularly in high-voltage direct current (HVDC) applications.
Innovation Solution
A switching system with a rotatable contact link between two contact points, where the contact link is connected to a bearing part via a rotary link mount, allowing for a floating suspension and spring-loaded contact pressure to ensure uniform contact pressure and compensate for erosion, with a magnetic element driving arcs into a quenching chamber to be extinguished by increasing the electrical voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact link is used to interrupt high DC current, then current interruption is achieved, but arc damage to components occurs
Solution Approach 1:
The harmful arc is extracted from the contact points and directed into a dedicated quenching chamber where it is extinguished. The magnetic element extracts the arc from the contact area and transports it to the quenching chamber, separating the arc generation location from the components that would be damaged by it.
Solution Approach 2:
The harmful arc is converted into a beneficial process by using the magnetic field to control its path and the quenching chamber to extinguish it in a controlled manner. The arc's energy is dissipated in the quenching chamber rather than damaging the contact points, transforming a harmful effect into a controlled interruption mechanism.
2Reliability
If fixed contact pressure is used to ensure good electrical contact, then contact resistance is reduced, but manufacturing tolerances and erosion cause non-uniform contact pressure
Solution Approach 1:
The contact pressure system transitions from a static fixed pressure mechanism to a dynamic spring-loaded system. The springs provide continuous contact force that automatically compensates for wear and manufacturing variations, maintaining uniform contact pressure throughout the component's lifecycle rather than relying on precise initial manufacturing tolerances.
Solution Approach 2:
The contact pressure parameter is changed from a fixed mechanical preload to a dynamic spring force that can adapt to changing conditions. The spring constant and precompression are optimized to provide sufficient contact pressure while accommodating manufacturing tolerances and wear, transforming the pressure application method to achieve better uniformity.
3Reliability
If a rotary link mount with floating suspension is used, then manufacturing tolerances are compensated, but device complexity increases
Solution Approach 1:
The link mount incorporates floating suspension that allows dynamic adjustment within tolerance ranges. The bearing parts can rotate and adjust their positions dynamically to accommodate manufacturing variations, providing self-alignment and tolerance compensation through controlled movement rather than rigid fixed positioning.
Solution Approach 2:
The floating suspension system provides self-alignment and self-adjustment capabilities that automatically compensate for manufacturing tolerances without requiring external adjustment mechanisms. The system serves itself by using the natural movement and elasticity of the floating connection to adapt to dimensional variations in the manufactured components.
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 system effectively interrupts current flow while protecting components from arc damage, ensuring safe operation and extended lifespan by uniformly distributing contact pressure and compensating for manufacturing tolerances and erosion, and allowing operation in both current directions without orientation considerations.
Implementation Method 1
the magnetic field is in this case at least partially perpendicular to the propagation direction of the respective arc, by which a Lorentz force is exerted on the respective arc
Implementation Method 2
an arc can be produced at the contact points, via which arc, or via the plasma produced as a result, electrical current flows
Data Source
AI summary
A switching system has two contact points and a contact link disposed so at be rotatably movable about an axis of rotation of the contact link between the two contact points. The switching system further has at least one quenching chamber and a magnetic element for producing a magnetic field being parallel to the axis of rotation of the contact link, for driving an arc produced when the contact points are open into the quenching chamber.