GIS Disconnector Rear Arcing Chamber for g3 Powder Containment
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Solution Overview
Problem
The generation of harmful powder during the opening of disconnectors in GIS using g3 gas, resulting from the decomposition of the gas and metal oxides, affects dielectric strength due to metal oxide particles on the corona shield surface, leading to peak effects.
Innovation Solution
A disconnector design that confines the arc generation by separating rear contacts before arcing contacts, using a movable electrically conducting tube and a lever mechanism to trigger an arc between rear contacts within a confined chamber, preventing gas decomposition in the main disconnector chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If g3 gas is used to replace SF6 in GIS disconnectors, then environmental impact is reduced, but harmful powder is generated during opening due to gas decomposition
Solution Approach 1:
The disconnector is divided into two separate chambers: a main chamber for normal operation and a dedicated rear arcing chamber for arc containment. This segmentation isolates the harmful decomposition effects to the rear chamber, preventing powder generation in the main chamber while maintaining environmental benefits of g3 gas usage
Solution Approach 2:
The arc that causes harmful decomposition is intentionally redirected to occur in the rear chamber rather than being eliminated. By confining the arc to a dedicated space, the harmful decomposition effects are contained and isolated, converting a potentially damaging phenomenon into a controlled process that protects the main chamber
2Ease of operation
If arc is generated during disconnector opening, then electrical separation is achieved, but dielectric strength is degraded due to metal oxide particles on corona shield surface
Solution Approach 1:
The arc generation process is extracted from the main disconnector chamber and relocated to a dedicated rear arcing chamber. This separation removes the source of metal oxide particle contamination from the main chamber, preserving dielectric strength while maintaining the electrical separation function
Solution Approach 2:
The rear arcing chamber acts as an intermediary space that isolates the harmful arc generation process from the main chamber. This intermediate structure prevents direct contamination of the main chamber components, particularly the corona shield, while still enabling the necessary arc discharge for electrical separation
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 solution effectively contains the arc and gas decomposition within a rear chamber, minimizing dielectric strength degradation and powder generation in the main disconnector chamber.
Implementation Method 1
g3 decomposition is combined with molted metal leading to metal oxyde particules
Implementation Method 2
triggering an arc between said rear contacts
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
The invention concerns a disconnector (100) for a GIS comprising , in a gas chamber and along an axis (AA'): - a pair of permanent contacts (24, 41), both being fixed; - an electrically conducting tube (30) movable along said axis (AA') the tube (30) moving from a position in which both permanent contacts are in electrical contact to a position in which both main contacts are electrically separated; - a pair of arcing contacts (22, 42), one (22) fixed and the other one (42) movable together with said electrically conducting tube (30); - a pair of rear contacts (521, 522), one of them (522) being in electrical contact with said movable arcing contact (42); - means (6) for moving said electrically conducting tube (30) and said movable arcing contact (22, 42) along said axis (AA'), thereby opening said disconnector (100) and for separating said rear contacts (521, 522) from each other before the arcing contacts (22, 42) separate.