DC Arc Chute Separator Structure to Prevent Insulation Ignition
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Solution Overview
Problem
Conventional DC arc chutes experience ignition and smoking of insulation plates due to high temperatures from splitter plates, which is not effectively addressed in existing designs.
Innovation Solution
Incorporating a separator, either as an air space or an insulating element, between splitter and insulation plates to prevent heat transfer, using materials resistant to high temperatures, and maintaining a specific distance or thickness to reduce heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation plates are placed directly adjacent to splitter plates to contain and cool the arc, then arc extinction performance is improved, but insulation plates are subjected to high temperatures causing ignition and smoking
Solution Approach 1:
A separator is introduced as an intermediary element positioned between the splitter plates and insulation plates. This separator acts as a thermal barrier that prevents direct heat transfer from the high-temperature splitter plates to the insulation plates, thereby protecting the insulation plates from ignition and smoking while maintaining their arc-containing function.
Solution Approach 2:
The space between splitter plates and insulation plates is segmented into two distinct zones: a first space for arc containment and a second space as a thermal buffer zone. This segmentation allows the insulation plates to remain close enough to the arc for effective containment while being sufficiently separated to avoid thermal damage.
2Power
If the gap between contacts is increased to raise arc voltage and interrupt DC current, then current interruption is achieved, but arc length increases and requires larger arc chute dimensions
Solution Approach 1:
The invention changes the thermal parameter distribution within the arc chute by introducing the separator and creating the two-space structure. This allows the arc chute to maintain compact dimensions while achieving the necessary arc voltage through optimized arc path configuration and thermal management, rather than simply increasing physical gap distances.
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
Prevents ignition and significantly reduces smoking of insulation plates by effectively isolating them from the high temperatures of the splitter plates, enhancing the arc chute's performance and safety.
Implementation Method 1
between splitter plates and insulation plates there is provided a separator having insulative properties
Implementation Method 2
The arc is attracted by magnetic and fluid-dynamic forces towards and between the splitter plates. The structure of the arc chute lengthens the arc further and splits it into small segments.
Implementation Method 3
Arc chute contains a set of stacks of substantially parallel metal plates insulated from each other by an air gap between each of them. The splitter plates split the arc into partial arcs and increase the arc voltage by multiplying the anode and cathode voltage drop.
Data Source
Figure 1a~2
Figure 3~4
Figure 5
AI summary
The present invention discloses an arc chute for a direct current switching device comprising at least one stack formed by a plurality of substantially parallel metallic splitter plates (1), at least one stack formed by a plurality of substantially parallel insulation plates (3), the edges of the insulation plates (3) facing the edges of the splitter plates (1), a housing (2) made of electrically insulating material surrounding at least one stack of splitter plates (1) and at least one stack of insulation plates (3). Between splitter plates (1) and insulation plates (3) there is provided a separator (4a, 4b) having insulative properties.