CO2-Barrier Enclosure Coating for Gas-Insulated Switchgear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas insulated electric apparatuses using CO2 as insulation gas experience higher leakage rates, leading to frequent refilling needs and increased service efforts, which is not addressed by existing technologies.
Innovation Solution
Incorporating a CO2-barrier arrangement, such as a SiOx compound coating or glass film layer, on the enclosure wall and sealings to reduce CO2 permeability, maintaining the insulating properties of epoxy-based composite materials while minimizing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If CO2 is used as insulation gas, then environmental performance is improved, but gas leakage increases leading to frequent refilling needs
Solution Approach 1:
A CO2-barrier arrangement in the form of a coating layer (e.g., SiOx compound or glass film) is applied to the inner surface of the enclosure wall and sealings. This thin film structure specifically blocks CO2 permeation while maintaining the flexibility and integrity of the enclosure, thereby reducing gas leakage without compromising the overall system design
Solution Approach 2:
The CO2-barrier arrangement combines different materials with complementary properties: the enclosure wall material (providing structural strength and insulation) is combined with a CO2-barrier coating layer (providing selective gas permeability resistance). This composite structure addresses both the mechanical requirements and the CO2 retention requirements simultaneously
2Reliability
If CO2-barrier arrangement is added to reduce leakage, then gas retention is improved, but device complexity increases
Solution Approach 1:
The CO2-barrier arrangement is merged with the existing enclosure wall structure and sealings. Instead of adding a separate, independent barrier system, the CO2-blocking function is integrated into the existing components through coating layers, thereby reducing gas leakage without significantly increasing overall device complexity
Solution Approach 2:
The CO2-barrier is implemented as a thin film coating rather than a thick or bulky structure. This approach provides effective CO2 blocking while maintaining a compact design that does not substantially increase the complexity or dimensions of the enclosure system
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 CO2-barrier arrangement significantly reduces gas leakage, enhancing operational robustness and reducing the frequency of service occasions, ensuring reliable functionality over extended periods.
Implementation Method 1
The CO2-barrier arrangement is adapted to reduce the permeability of CO2 through an enclosure wall of the enclosure
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a gas insulated electric apparatus (1) comprising an enclosure (7) and an electric high voltage appliance (9) located inside the enclosure. The enclosure (7) contains an insulation gas (8) comprising at least 70 % by volume of CO2. The insulation gas has an elevated and pre-determined operating gas pressure level. The enclosure (7) comprises a CO2-barrier arrangement (15) adapted to reduce the permeability of CO2 through the enclosure wall.