Electric Arc Protection Device Using Short-Circuit Extinction
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Solution Overview
Problem
Current protection methods against electric arcs in electric installations often result in equipment shutdown and prolonged outage, failing to differentiate between arcs with fleeting causes and those requiring human intervention, leading to unnecessary disruptions and potential safety hazards.
Innovation Solution
A protection device and method that utilize a detection apparatus, a short-circuiting mechanism, and an electronic control unit to establish a short-circuit for arc extinction, followed by a predefined time delay to assess the arc's persistence, allowing for selective treatment of arcs with fleeting causes without interrupting power supply and isolating the installation from the power source only if the arc is persistent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a short-circuit is established to extinguish an electric arc, then the arc extinction speed is improved, but the equipment shutdown time increases due to manual intervention requirements
Solution Approach 1:
The system performs preliminary assessment by detecting whether an electric arc persists after a predetermined time period. Based on this preliminary detection, it decides whether to maintain the short-circuit state or restore power, avoiding unnecessary manual intervention and equipment shutdown for transient arcs
Solution Approach 2:
The system continuously monitors the electric arc status after initial detection and uses this feedback information to determine the appropriate response. If the arc disappears within the predetermined time, the system feedbacks to restore power automatically; if it persists, the system maintains the protective shutdown state
2Reliability
If power supply is interrupted to eliminate an electric arc, then the safety against persistent arcs is improved, but the operational continuity deteriorates due to unnecessary shutdowns for fleeting causes
Solution Approach 1:
Before executing power supply interruption, the system performs a preliminary detection phase to assess whether the electric arc is transient or persistent. This preliminary action distinguishes between fleeting causes that don't require shutdown and genuine hazards needing intervention
Solution Approach 2:
The protective response is made dynamic and adaptive based on the actual arc behavior. The system transitions from a static protective approach (always shutdown) to a dynamic one where the response level (maintain short-circuit or restore power) changes according to whether the arc persists beyond the predetermined time threshold
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 approach enables rapid extinction of electric arcs with fleeting causes without service disruption, reducing the risk of damage and ensuring continuous operation, while isolating and addressing persistent arcs to prevent reoccurrence, thus enhancing safety and minimizing operational downtime.
Implementation Method 1
at least one detection apparatus of the electric arc
Implementation Method 2
at least one short-circuiter establishing a short-circuit for extinction of the electric arc
Data Source
AI summary
A device for protection against an electric arc in an electric installation comprising: at least one detection apparatus of the electric arc, at least one short-circuiter establishing a short-circuit for extinction of the electric arc, an electronic control unit of the short-circuiter commanding to an established state of said short-circuit in case of detection of the electric arc by the detection apparatus, and a switchgear apparatus for interrupting said short-circuit at the end of a predefined short-circuit time delay as from the time this short-circuit is established.