Variable Venting Arc Mitigation Shield
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Solution Overview
Problem
Existing arc mitigation systems face challenges in safely diverting fault energy from arc flash events without causing excessive current flow through the ground path, leading to complex production processes and increased costs due to the need for additional components like charge collectors and coatings.
Innovation Solution
The proposed solution involves a circuit protection device with a containment shield that generates a secondary arc to divert energy from the primary arc flash, using a biasing assembly to create a variable venting path for arc gases and pressure, preventing excessive current flow through the ground by allowing the containment shield to move away from the conductor base and venting arc products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a containment device with electrodes and plasma generating device is used to divert arc energy, then arc flash energy is redirected to a safe zone, but excessive current flows through the ground path due to charged particle deposition
Solution Approach 1:
The invention extracts and removes charged particles from the arc plasma before they can deposit on grounded parts. A charged particle removal device is positioned to intercept particles emerging from the arc containment chamber, preventing their deposition on ground path components and eliminating the source of excessive ground current.
Solution Approach 2:
The invention introduces a charged particle removal device as an intermediary between the arc containment chamber and the ground path. This mediator captures and removes charged particles from the plasma flow, preventing direct interaction between particles and grounded surfaces that would otherwise create harmful ground path currents.
2Object-generated harmful factors
If charge collectors and coating components are added to prevent excessive ground current, then ground path current is controlled, but the production process becomes complex and costs increase
Solution Approach 1:
The invention employs a charged particle removal device that operates autonomously within the arc mitigation system. The device self-regulates particle removal without requiring external control systems or complex monitoring, simplifying the overall production process while effectively controlling ground path currents.
3Reliability
If a containment shield is made stationary to maintain dielectric integrity, then arc product containment is improved, but arc gases and pressure cannot vent effectively
Solution Approach 1:
The invention transforms the containment shield from a stationary structure to a dynamic, movable component. The shield can move relative to the arc containment chamber in response to internal pressure, automatically opening vent paths when pressure builds up while maintaining dielectric integrity during normal operation. This dynamic behavior allows the system to adapt to varying operational conditions.
4Object-generated harmful factors
If the containment shield moves away from the conductor base to vent arc gases, then arc product venting is improved, but the gap creation mechanism adds structural complexity
Solution Approach 1:
The invention uses pneumatic pressure from the arc plasma itself as the actuating force to move the containment shield. The high-pressure arc gases generated during arcing automatically push the shield away from the conductor base, creating vent paths without requiring external mechanical actuators or complex movement control mechanisms.
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 effectively enhances the flow of ionized gases, heat, and pressure out of the containment chamber, reducing damage from arc flash events while maintaining dielectric integrity and avoiding ground path current, thus minimizing equipment damage and operational costs.
Implementation Method 1
an arc flash can occur... The insulation between the conductors can become ionized, which makes the insulation conductive and enables arc formation
Implementation Method 2
The insulation between the conductors can become ionized, which makes the insulation conductive
Implementation Method 3
a biasing assembly positioned between the cover and the containment shield... configured to permit the containment shield to move away from the conductor base
Data Source
AI summary
Equipment protection systems, arc containment devices, and methods of assembling arc containment devices are disclosed. In one example, an electrical isolation structure includes a conductor base, a cover coupled to the conductor base and defining an isolation chamber, a containment shield disposed on the conductor base within the isolation chamber, and a biasing assembly positioned between the cover and the containment shield. The containment shield defines a containment chamber configured to enclose the plurality of electrode assemblies. The containment shield is configured to at least partially contain the arc products within the containment chamber. The biasing assembly is configured to permit the containment shield to move away from the conductor base to thereby define a gap between the conductor base and the containment shield to enable at least some of the arc gases to vent from the containment chamber.