Arc Mitigation Assembly With Movable Containment Shield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power equipment protection systems face significant damage from arc flash events due to the rapid release of energy, which can vaporize conductors and cause extensive damage, and current arc mitigation systems are complex and costly to implement, often leading to excessive current flow through the ground path.
Innovation Solution
A circuit protection device with a containment shield and plasma generating device that creates a secondary arc to divert energy away from the primary arc flash, using a movable containment shield and isolation assembly to prevent ground strike by routing exhaust gases and pressure out of the equipment enclosure without grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plasma generating device and containment chamber are used to divert arc flash energy, then arc flash damage is reduced, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the harmful charged particles and exhaust gases from the arc containment chamber by providing a designated exit path that directs them away from grounded parts. This removes the source of ground strike current without requiring complex additional components like charge collectors or specialized coatings.
Solution Approach 2:
The patent introduces an intermediary exit path as a mediator between the arc containment chamber and the external environment. This intermediate structure allows controlled discharge of exhaust gases and charged particles, preventing direct contact with grounded parts while maintaining system simplicity.
2Object-affected harmful factors
If charge collectors and coatings are added to prevent ground strike, then ground strike is avoided, but the production process becomes complex and cost increases
Solution Approach 1:
The patent extracts charged particles from the containment chamber through a designated exit path before they can deposit on grounded parts. This preventive extraction approach eliminates the need for additional charge collection components and specialized coatings, simplifying manufacturing.
Solution Approach 2:
The arc containment chamber's exhaust path serves dual functions: it vents exhaust gases for pressure relief and simultaneously directs charged particles away from grounded parts. This self-service approach combines multiple protective functions into the existing structure without adding separate components.
3Stability of the object's composition
If the containment shield is fixed, then structural stability is maintained, but exhaust gases and pressure cannot be effectively channeled away
Solution Approach 1:
The patent implements a moveable containment shield that can dynamically adjust its position in response to pressure changes during arc events. This dynamic capability allows the shield to effectively channel exhaust gases and pressure waves away from grounded parts while maintaining structural integrity, combining stability with adaptive movement.
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
Effectively mitigates arc flash damage by diverting energy away from the primary arc flash, reducing the risk of ground strike and minimizing damage to equipment while maintaining system safety and reducing costs through simplified design.
Implementation Method 1
A plasma generating device is included within the arc containment chamber. When the arc flash event is detected, the plasma device emits ablative plasma towards the electrodes. The ablative plasma reduces electrical impedance between the electrodes, and an electrical arc may be formed between the electrodes.
Implementation Method 2
The containment shield is operative to move away from the conductor base in response to a change in pressure produced by the arc within the containment chamber.
Implementation Method 3
The insulation between the conductors can become ionized, which makes the insulation conductive and enables arc formation.
Implementation Method 4
The ablative plasma reduces electrical impedance between the electrodes, and an electrical arc may be formed between the electrodes. The electrical arc diverts energy from the first arc flash zone to the arc chamber until the arc flash is abated or extinguished.
Data Source
AI summary
A circuit protection device is provided for use with a circuit that includes at least one pair of conductors. The protection device is configured to generate an arc. The protection device includes at least a pair of electrode assemblies electrically coupled to the at least one pair of conductors and a conductor base to support the pair of electrode assemblies. The protection device includes a cover coupled to the conductor base and defining at least one isolation chamber, wherein the electrode assemblies are disposed within the isolation chamber. The protection device includes a containment shield moveably coupled to the cover. The containment shield defines a containment chamber configured to contain charged particles produced by the arc. The containment shield is operative to move relative to the cover in response to a change in pressure produced by the arc within the containment chamber. An isolation assembly is coupled to at least one of the cover and the containment shield and configured to prevent the cover from contacting the containment shield.