Gas Circuit Breaker Trigger Electrode Guide
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Solution Overview
Problem
Gas circuit breakers experience mechanical vibration during current breaking, leading to the formation of triple junctions, arc extinguishing gas leakage, and generation of metal foreign materials, which compromise electrical insulation performance.
Innovation Solution
A gas circuit breaker design featuring a bar-shaped trigger electrode and a guide portion within the cylindrical second arc contactor, which suppresses mechanical vibration, reduces triple junction formation, and minimizes arc extinguishing gas leakage by maintaining a controlled distance between the trigger electrode and the arc contactor, ensuring reliable electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moving electrode is disposed close to the insulating material to reduce mechanical vibration, then the electrical insulation performance is improved, but the arc extinguishing efficiency deteriorates due to insufficient gas flow direction control
Solution Approach 1:
The patent introduces a guide portion as an intermediary component between the moving electrode and the insulating material. This guide portion serves as a mediator that maintains a predetermined distance to prevent direct contact during vibration, thereby preserving electrical insulation performance while still allowing the moving electrode to be positioned sufficiently close to the insulating material for effective arc extinguishing.
Solution Approach 2:
The patent resolves the spatial conflict by adding a dimensional constraint through the guide portion's structure. The guide portion extends in a direction perpendicular to the movement direction of the moving electrode, creating a three-dimensional spatial arrangement that maintains the required distance while preserving the necessary proximity for arc control.
2Object-affected harmful factors
If the moving electrode is disposed away from the insulating material to avoid triple junction formation, then the electrical insulation performance is improved, but the arc extinguishing efficiency deteriorates due to insufficient gas flow direction control
Solution Approach 1:
The guide portion acts as an intermediary that prevents the formation of triple junctions by maintaining a predetermined distance between the moving electrode and the insulating material during operation, while still enabling the moving electrode to be positioned close enough to the arc contactor for effective arc extinguishing.
3Reliability
If the moving electrode is disposed close to the arc contactor to prevent discharge and metal foreign material generation, then the reliability is improved, but the mechanical vibration increases due to repeated contact
Solution Approach 1:
The guide portion provides beforehand cushioning by maintaining a predetermined distance between the moving electrode and the arc contactor. This prevents direct contact and the resulting mechanical vibration and discharge, while still allowing the moving electrode to be positioned close enough to effectively control and extinguish the arc.
4Productivity
If the arc extinguishing gas is pressurized to increase spray velocity, then the arc extinguishing efficiency is improved, but the gas leakage increases due to concave portions on the arc contactor
Solution Approach 1:
The patent converts the potential harm of gas leakage into a benefit by designing the guide portion to maintain a predetermined distance that prevents concave portion formation on the arc contactor. This eliminates the leakage path while preserving the pressurization effect for efficient arc extinguishing.
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 design effectively reduces mechanical vibration, maintains arc extinguishing gas pressure, and prevents the generation of metal foreign materials, thereby enhancing the electrical insulation performance and reliable arc extinction in gas circuit breakers.
Implementation Method 1
The gas circuit breaker as described above extinguishes the arc by compressing to pressurize the arc extinguishing gas inside with a piston and a cylinder
Implementation Method 2
an arc generated between the first arc contactor and the trigger electrode
Data Source
AI summary
A gas circuit breaker comprises: a first arc contactor 21; a cylindrical second arc contactor 41; a rod-shaped trigger electrode 31 that is disposed to be movable between the first arc contactor 21 and the second arc contactor 41, and moves inside the cylindrical second arc contactor 41 to ignite an arc at the second arc contactor 41 in the latter half of the current break interval; and a guide portion 41b that has an inner diameter larger than the outer diameter of the trigger electrode 31, has an inner diameter smaller than the inner diameter of a portion of the second arc contactor 41 which is close to the trigger electrode 31, and is disposed in the cylinder of the second arc contactor 41 so as to go around the trigger electrode 31 when the trigger electrode 31 is in a closed state with the first arc contactor 21.