Arc-Resistant Enclosure Louver and Fire Panel Arresting System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing arc-resistant electrical enclosures face challenges in configuring passages for forced-air cooling without allowing high pressure gases and flames to escape during an arc event.
Innovation Solution
An improved arresting system comprising a louver apparatus and a cover apparatus that work together to resist the flow of gases, plasma, and flames, where the louver apparatus moves from an open to a closed state in response to fluid pressure, and the cover apparatus transforms to block flames through a fire blocking panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passages are configured to permit forced air circulation for cooling, then cooling efficiency is improved, but the enclosure fails to resist high pressure gases and flames during arc events
Solution Approach 1:
The louver apparatus employs movable louvers that can dynamically transition between open and closed positions. During normal operation, louvers remain open to permit forced-air cooling. During an arc event, high pressure gases and plasma flow impinge on the louvers, causing them to automatically close and block the passage, thus preventing flame and gas escape while maintaining cooling efficiency during ordinary operation
Solution Approach 2:
The fire blocking panel utilizes material transformation in response to thermal parameters. When exposed to flame or extreme heat from an arc event, the panel undergoes a transformation from a first state (permitting fluid flow) to a second state (resisting flame communication). This parameter-based state change allows the enclosure to adapt its flow resistance properties based on thermal conditions, maintaining cooling during normal operation while blocking flames during arc events
2Productivity
If the louver apparatus remains in the open state to permit forced-air cooling, then cooling is effective, but high pressure gases can escape during an arc event
Solution Approach 1:
The louver apparatus is pre-configured to automatically close in response to the impingement of high pressure gases and plasma during an arc event. This preliminary anti-action mechanism is designed to counteract the harmful effect of gas escape before it can propagate, while maintaining the open state for effective cooling during normal operation. The louvers act as a passive safety mechanism that responds to pressure changes without requiring external control systems
3Reliability
If the fire blocking panel transforms to block flames, then arc resistance is improved, but fluid flow is restricted during normal operation
Solution Approach 1:
The fire blocking panel is designed to remain in a first state during normal operation that permits fluid flow through its openings, ensuring ease of operation for forced-air cooling. When exposed to flame or extreme thermal conditions during an arc event, the panel undergoes a transformation to a second state where it resists flame communication. This parameter-based state change ensures that the panel does not restrict fluid flow during normal operation while providing arc resistance when needed
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
The system allows for forced-air cooling during normal operation while effectively preventing the escape of gases, plasma, and flames during an arc event, enhancing the safety and integrity of the electrical enclosure.
Implementation Method 1
movable between an open state permitting fluid flow therethrough and a closed state wherein the number of louvers resist fluid flow therethrough responsive to a predetermined fluid pressure impinging on the number of louvers
Implementation Method 2
responsive to a flame, the fire blocking panel initiating a transformation from the first state toward a second state wherein at least some of the number of openings resist the communication of flames therethrough
Data Source
AI summary
An arc-resistant electrical enclosure includes an arresting system that permits forced-air cooling of the interior region to occur during ordinary operation of the enclosure while resisting the flow of hot gases, plasma, and flames to the exterior of the electrical enclosure in an arc event or other event. The arresting system advantageously includes a louver apparatus and a cover apparatus that work in conjunction to resist the flow of gases, plasma, and flames to the exterior of the cabinet in an arc event. The louver apparatus includes louvers that can be moved from an open state to a closed state responsive to a predetermined fluid pressure impinging on the louvers. The cover apparatus includes a fire blocking panel that permits fluid flow therethrough during ordinary operation but which, responsive to a flame, initiates a transformation from one state to another state wherein the openings resist the communication of flames therethrough.