CO2 Gas-Insulated Enclosure Barrier for Pressure Retention
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Solution Overview
Problem
Gas insulated electric apparatuses using CO2 as insulation gas face significant leakage issues due to high permeation rates through epoxy-based enclosures, leading to pressure drops and reduced dielectric and current switching performance, along with potential corrosion and decomposition of components.
Innovation Solution
A permeation barrier with a low permeation material, such as ethylene vinyl alcohol or aluminum oxide foil, is applied within the enclosure, surrounded by a flow promoter and/or surface activation layer to prevent gas permeation, ensuring a stable insulation gas pressure and reliable dielectric behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If CO2 is used as insulation gas to replace SF6 for environmental reasons, then environmental compatibility is improved, but gas permeation through enclosure increases leading to pressure loss
Solution Approach 1:
A permeation barrier layer is introduced as an intermediary component between the CO2 insulation gas and the enclosure wall. This barrier layer selectively prevents CO2 permeation through the enclosure while allowing the enclosure to maintain its structural and insulating functions, thus resolving the contradiction between using environmentally friendly CO2 and preventing gas loss.
Solution Approach 2:
The solution employs a composite structure consisting of the enclosure material combined with a permeation barrier layer having different permeation properties. This composite approach allows the system to benefit from both the environmental advantages of CO2 and the low permeation characteristics of the barrier material.
2Loss of substance
If permeation barrier is added to prevent CO2 leakage, then gas retention is improved, but device complexity increases
Solution Approach 1:
The permeation barrier is implemented as a thin film or layered structure applied to the enclosure interior surface. This approach provides effective gas retention without significantly increasing structural complexity, as the barrier can be applied as a coating or thin layer rather than requiring substantial additional components.
Solution Approach 2:
The permeation barrier is applied during the manufacturing process as a preliminary step before the enclosure is assembled and filled with gas. This preliminary action integrates the barrier function into the enclosure production itself, avoiding the need for separate installation steps and reducing overall device complexity.
3Reliability
If CO2 pressure is maintained at elevated levels for proper insulation performance, then dielectric strength is improved, but risk of leakage and operational disturbances increases
Solution Approach 1:
The permeation barrier acts as an intermediary that decouples the relationship between elevated CO2 pressure and gas loss. By preventing permeation at the enclosure interface, the barrier allows the system to maintain high pressure for dielectric strength without the corresponding increase in leakage that would otherwise occur, thus resolving the contradiction between reliability and pressure stability.
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 reduces gas leakage, maintaining stable insulation gas pressure and preventing component corrosion, thus ensuring reliable dielectric and current switching performance in gas insulated electric apparatuses.
Implementation Method 1
Gas insulated electric apparatuses using CO2 as insulation gas face significant leakage issues due to high permeation rates through epoxy-based enclosures
Implementation Method 2
The insulation gas serves as an electric insulation medium and prevents electric discharge between the enclosure and the electrical components inside the enclosure
Implementation Method 3
the insulation gas serves as a cooling medium for suppressing temperature rise due to electric current
Data Source
AI summary
The disclosure relates to a gas insulated electric apparatus, which includes an enclosure, an electric high voltage appliance arranged inside the enclosure and a permeation barrier arranged within the enclosure and circumferentially surrounding the electric high voltage appliance, whereby the enclosure contains an insulation gas including at least 70% by volume of CO2 and including an elevated and pre-determined operating gas pressure level, and the permeation barrier includes a permeation layer surrounded on at least one side by a flow promoter layer and/or a surface activation and/or primer layer.