Busbar Current Breaker With Cavity Filter Arc Transfer
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Solution Overview
Problem
Existing power isolators with metallic filter elements in blow-out channels struggle to minimize external impact during circuit board separation, as the filter material is limited to these channels and does not effectively manage the arc formed between the busbar and the circuit board.
Innovation Solution
Extending the metallic filter element into the cavity ensures contact with the circuit board upon separation, allowing the arc to rise onto the filter element, converting system inductance energy into heat loss, and using additional filter elements on both sides of the piston to distribute current flow, with optional inclusion of an extinguishing agent and recesses in the housing to enhance cooling and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter elements are placed only inside discharge channels, then the structure is simple, but the arc cannot be effectively cooled and external effects occur
Solution Approach 1:
The filter element is divided into multiple sections: a first section inside the discharge channel and a second section extending into the cavity. This segmentation allows the filter to cool arcs at different locations - the first section handles arcs in the discharge channel while the second section handles arcs forming in the cavity between the circuit board and busbar ends, thereby eliminating external effects without requiring a completely complex redesign
Solution Approach 2:
The filter element extends from the discharge channel into the cavity space, adding a spatial dimension to the filter's coverage. This dimensional extension allows the filter to intercept arcs before they can escape externally, transforming the filter's functionality from a passive channel component to an active cavity protector
2Object-affected harmful factors
If the filter element extends into the cavity to contact the circuit board, then arc cooling is improved, but the risk of external arcs increases
Solution Approach 1:
The insulating plate serves as an intermediary barrier between the conductive busbar and the conductive filter element. This intermediary maintains galvanic isolation during normal operation while still allowing the filter element to extend into the cavity to cool arcs, as the insulating plate prevents direct electrical contact between the filter and busbar
3Loss of energy
If additional filter elements are added on both sides of the piston, then current distribution is improved, but the device complexity increases
Solution Approach 1:
Multiple filter elements are merged into a coordinated system where the first filter element inside the discharge channel and the second filter element in the cavity work together. Additionally, filter elements on both sides of the piston are combined to distribute current flow, creating a synergistic effect that improves energy management without proportionally increasing complexity
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 design significantly reduces external impact, ensuring almost complete prevention of external arcs and maintaining galvanic isolation, while safely interrupting high currents and voltages without additional extinguishing agents, and enhances cooling efficiency.
Implementation Method 1
These elements cool the arc plasma and thus contribute to a more rapid extinguishing of the arc
Implementation Method 2
metallic filter elements may be present. These elements cool the arc plasma
Implementation Method 3
As a result of the circuit board contacting the filter element, the arc spreads to the metallic filter element as the circuit board moves further away from the ends of the busbar
Implementation Method 4
thereby converting the energy from the system inductance into heat loss in the filter
Implementation Method 5
the extinguishing agent is a silicon compound, in particular a silicone oil or a silicone-containing grease
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a current breaker in which a busbar (18) passes through a cavity (25) in which a piston (14) can be moved. By moving the piston (14), a circuit board (19) is broken out of the busbar (18), thus interrupting the current flow. The current breaker has at least one metal filter element (16) which, according to the invention, extends up to the cavity (25). This ensures that the disconnected circuit board (19) touches the at least one filter element (16) during tripping. After the circuit board (19) is separated from the busbar (18), an electric arc is formed which, due to the filter element (16) being touched by the circuit board (19), switches over to the metal filter element (16) when the circuit board (19) continues to move, as a result of which the energy from the system inductance is converted into heat loss in the filter element (16). When suitably designed, there is only a moderate increase in pressure in the current breaker and thus practically no external effect. Additionally, an extinguishing agent, e.g. a silicone oil or a silicone-containing grease, may be provided. The housing can be sealed and the filter elements (16, 16') can be insulated from the exterior.