Ablative Plasma Gun for Arc Flash Mitigation
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Solution Overview
Problem
Current arc flash mitigation techniques in electrical power systems are slow to respond and costly, causing damage due to the high stress on upstream transformers and inefficiencies in arc fault management.
Innovation Solution
An ablative plasma gun system with a first and second electrode forming a longitudinal slot, coupled with a dielectric layer, is used to generate plasma that bridges the gap between main electrodes upon detection of an arc fault, lowering impedance and creating a protective arc to quickly divert energy and trip upstream circuit breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard fuses and circuit breakers are used for arc flash mitigation, then the system is simple and cost-effective, but the response time is slow and insufficient to mitigate arc flash effectively
Solution Approach 1:
The plasma gun is pre-positioned and pre-charged within the circuit breaker, ready to inject plasma into the arc path before the arc flash fully develops. This preliminary positioning allows the system to respond immediately when an arc fault is detected, rather than relying on slower mechanical tripping mechanisms.
Solution Approach 2:
The invention replaces the mechanical operation of traditional circuit breakers with a plasma-based electrical intervention. Instead of mechanically opening contacts to interrupt the arc, the system uses a plasma gun to inject ionized gas that modifies the arc path and redirects current, achieving faster response times without mechanical movement.
2Reliability
If mechanical crowbar switches are used to short the line voltage and divert energy, then arc flash is mitigated, but the switches are large, costly, and cause extreme stress on upstream transformers
Solution Approach 1:
The invention extracts the arc redirection function from the main power circuit and implements it within the circuit breaker itself. The plasma gun is integrated into the breaker structure, allowing the arc to be redirected through a dedicated plasma injection path rather than forcing the entire upstream power system to handle the redirecting current.
Solution Approach 2:
The plasma acts as an intermediary medium between the arc source and the redirect path. Instead of directly shorting the line voltage through mechanical contacts that stress transformers, the plasma gun introduces ionized gas that facilitates current redirection through a controlled path, reducing the stress on upstream equipment.
3Length of stationary object
If conventional arc mitigation devices are used, then the structure is simple, but the device cannot effectively bridge larger gaps in medium voltage systems
Solution Approach 1:
The plasma jet extends the effective reach of the circuit breaker in the spatial dimension. By injecting plasma along the arc path, the system can bridge larger gaps between contacts than would be possible with direct mechanical contact alone, effectively extending the operational range of the breaker without proportionally increasing its physical size.
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 ablative plasma gun system achieves a faster response time and cost-effective arc flash mitigation by generating a wide plasma spread that effectively bridges larger gaps in medium voltage systems, reducing the stress on transformers and improving arc fault management.
Implementation Method 1
An ablative plasma gun having a first gun electrode and a second gun electrode arranged between a dielectric layer to form a longitudinal slot
Implementation Method 2
generate plasma that bridges the gap between main electrodes upon detection of an arc fault, lowering impedance
Implementation Method 3
Ablative plasma gun includes a first gun electrode and a second gun electrode arranged between a dielectric layer
Data Source
AI summary
An ablative plasma gun is presented. The ablative plasma gun includes a first gun electrode and a second gun electrode arranged between a dielectric layer to form a longitudinal slot. An opening at a distal end of the longitudinal slot is provided to spread generated plasma.