Reactive Coating Arc Extinguishing Switch
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Solution Overview
Problem
Existing high-current safety fuses have variable shutoff times and are hazardous due to prolonged electric arcs, which can lead to cable fires and material vaporization, making it difficult to safely disconnect high-voltage direct currents.
Innovation Solution
An interruption switch with a reactive material coating in a reaction chamber that extinguishes electric arcs, featuring a contact unit with a separation region that can be actively or passively tripped, using pyrotechnic or mechanical means, and a consumable design for single-use operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional safety fuses are used to interrupt high currents, then the circuit can be disconnected, but the shutoff time varies within a large range causing cable utilization to be limited to 30% of its current-carrying capacity
Solution Approach 1:
The patent changes the physical-chemical parameters of the reaction chamber environment by introducing a reactive coating material that undergoes exothermic reaction when exposed to the electric arc. This chemical reaction fundamentally alters the thermal and chemical environment, enabling rapid arc extinction while maintaining predictable and consistent shutoff characteristics, thereby resolving the contradiction between reliable protection and efficient cable utilization.
2Reliability
If high-voltage direct current is disconnected, then the circuit can be interrupted, but the electric arc remains stable and vaporizes materials producing toxic gases and conductive substances that support the arc
Solution Approach 1:
The patent converts the harmful high-temperature electric arc into a beneficial tool by using it to trigger the exothermic reaction of the reactive coating material. The arc's thermal energy initiates the chemical reaction, which then produces hot reaction products that actively suppress and extinguish the arc, transforming the arc from a destructive force into the mechanism that eliminates itself and protects against material vaporization and toxic gas production.
Solution Approach 2:
The reactive coating material acts as a strong oxidizing agent that accelerates the combustion process when triggered by the electric arc. This exothermic oxidation reaction rapidly consumes the arc's energy and produces hot reaction products that further accelerate the extinction process, preventing material vaporization and toxic gas formation while ensuring reliable current interruption.
3Ease of operation
If the separation region is separated to interrupt the current path, then the circuit can be disconnected, but the electric arc vaporizes all materials in its reach and produces highly toxic gaseous substances
Solution Approach 1:
The reactive coating material serves as an intermediary substance between the electric arc and the reaction chamber walls. Instead of the arc directly contacting and vaporizing the chamber materials, the coating material intercepts the arc's energy through exothermic reaction, converting it into controlled chemical reaction products that safely extinguish the arc without causing material vaporization or toxic gas production.
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
Rapid and effective disconnection of high currents at high voltages with reduced material damage and safety hazards, ensuring reliable operation even after prolonged periods without maintenance.
Implementation Method 1
an electric arc, once formed in or on the switch, is not extinguished by itself, but rather remains stable and vaporizes all the materials in its reach here due to its extremely high temperature of several 1000° C.
Implementation Method 2
The coating is formed from a reactive material which is designed in such a way that, under the influence of an electric arc, it reacts in an exothermic manner
Data Source
AI summary
An interruption switch is provided for interrupting high currents at high voltages, with a casing, which surrounds a contact unit defining the current path through the interruption switch which has a first and second connection contact and a separation region. The contact unit is formed such that a current can be supplied to it via the first connection contact and can be discharged therefrom via the second connection contact, or vice versa. The separation region is formed such that, when it is separated, the current path between the first connection contact and the second connection contact is interrupted. The separation region is arranged inside a reaction chamber. A coating with a reactive material is present in the reaction chamber. The reactive material is designed such that under the influence of an electric arc it attenuates or extinguishes the electric arc.