Two-Piston Arc Quenching for Fast Three-Phase Switchgear Protection
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Solution Overview
Problem
Existing three-phase electrical switchgear systems struggle to quickly quench arcs, with circuit breakers taking too long to interrupt fault currents, potentially causing significant damage.
Innovation Solution
An arc quenching device using pyrotechnical actuators to drive conductive pistons that short-circuit all three phases via two pistons, reducing the arc quenching time to less than 5 ms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit breaker is used to interrupt fault currents, then the arc can be quenched, but the opening time is relatively long (30 to 60 ms)
Solution Approach 1:
The patent replaces the mechanical circuit breaker system with a pyrotechnical actuator system that uses chemical energy to drive pistons for rapid short-circuiting. The pyrotechnical actuator converts chemical energy to mechanical motion instantaneously, eliminating the mechanical delays inherent in traditional circuit breakers and achieving arc quenching within 2 ms.
Solution Approach 2:
The patent pre-positions conductive pistons in close proximity to the busbars, ready for immediate deployment. When an arc is detected, the pyrotechnical actuator instantly propels the pre-positioned pistons to create the short-circuit path, eliminating the time required for mechanical movement and contact closure that plagues traditional circuit breakers.
2Reliability
If three separate pistons are used to short-circuit each phase individually, then complete phase short-circuiting is achieved, but device complexity and cost increase
Solution Approach 1:
The patent designs a single piston structure that performs multiple functions by sequentially contacting different busbars. The piston is configured to first contact one phase busbar and then continue moving to contact another phase busbar, allowing one piston to accomplish what would traditionally require two separate pistons, thereby reducing overall system complexity.
Solution Approach 2:
The patent merges the functions of multiple pistons into a single integrated piston structure. By designing the piston with appropriate geometry and movement characteristics, it combines the short-circuiting function for multiple phases into one component, reducing the total number of moving parts and simplifying the overall device architecture.
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 device effectively short-circuits all three phases within 5 ms, minimizing damage from arcs and reducing the complexity and cost of the quenching mechanism.
Implementation Method 1
at least one pyrotechnical actuator arranged with the first and second pistons to axially move each of the first and second pistons if the at least one pyrotechnical actuator is fired
Data Source
AI summary
An arc quenching device for a three-phase electrical switchgear. The device includes a first busbar, a second busbar and a third busbar, each of a respective phase of the three-phase switchgear. The device also includes a first piston and a second piston, each of an electrically conductive material. The device also includes at least one pyrotechnical actuator arranged with the first and second pistons to axially move each of the first and second pistons if the at least one pyrotechnical actuator is fired. The first and second pistons are arranged in relation to the first, second and third busbars such that said axial movement brings the first piston into contact with both the first busbar and the second busbar, and the second piston into contact with both the first busbar and the third busbar.