Corrugated Switchgear Enclosure for High-Pressure Dielectric Gas
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Solution Overview
Problem
Metal enclosures for gas-insulated switchgear face challenges in withstanding higher pressures required for gases like dry air, N2, and CO2, which demand increased pressure without enlarging the enclosure, and traditional solutions become heavy and expensive at higher pressures.
Innovation Solution
A metal enclosure design featuring corrugated metal walls with elongated metal elements and stiffeners attached outside the enclosure, distributing pressure forces across the corrugations, allowing for higher pressure resistance without increasing size, using materials like steel and welding for strong anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure of the gas inside the metal enclosure is increased to improve dielectric withstand, then the insulation performance is improved, but the metal enclosure walls must withstand higher forces requiring heavier and more expensive construction
Solution Approach 1:
The patent applies corrugations (curved geometric features) to the metal enclosure walls to enhance their mechanical strength and pressure resistance. The corrugated structure provides curvature that distributes stress more effectively, allowing the enclosure to withstand higher gas pressures without requiring increased wall thickness or weight.
Solution Approach 2:
The patent divides the enclosure walls into multiple segments connected by rigid links. This segmentation allows the structure to better distribute and manage mechanical stresses from internal pressure, improving overall structural efficiency and pressure resistance without proportionally increasing weight.
2Strength
If traditional metal enclosure designs are used to withstand high pressures, then pressure resistance can be achieved, but the enclosure size must be increased or the construction becomes heavy and expensive
Solution Approach 1:
The corrugated wall design with geometric curvature enhances the structural strength-to-weight ratio, allowing the enclosure to resist high pressures while maintaining a compact size and reduced weight compared to traditional flat-walled enclosures.
Solution Approach 2:
By segmenting the walls and connecting them with rigid links, the structure achieves improved pressure distribution and resistance, enabling high strength performance without proportional weight increase.
3Object-generated harmful factors
If gases like dry air, N2, or CO2 are used as dielectric media to improve environmental performance, then environmental friendliness is improved, but higher pressures are required to provide adequate insulation
Solution Approach 1:
The corrugated wall structure enables the enclosure to withstand the higher pressures required for environmentally friendly gases like dry air, N2, or CO2, making these gases viable options for GIS applications without compromising structural integrity.
Solution Approach 2:
The segmented wall design with rigid links provides the necessary pressure resistance to enable the use of eco-friendly dielectric gases, allowing the system to operate at higher pressures safely and efficiently.
Data Source
AI summary
A metal enclosure for electrical switchgear, the metal enclosure is configured to be pressurized above atmospheric pressure, the metal enclosure having: metal walls sealing a volume for accommodating the electrical switchgear, the metal walls including a first metal wall arranged opposite a second metal wall, wherein at least the second metal wall is a corrugated metal plate with corrugations that extend along a first axis, a set of elongated metal elements attached to the first metal wall and to the second metal wall, the elongated metal elements are arranged through holes in the first metal wall and in the second metal wall and reach outside the metal enclosure, a set of elongated metal stiffeners attached to a rear side of the second metal wall outside the metal enclosure, each of the metal stiffeners is attached to at least two of the corrugations of the second metal wall, wherein each metal stiffener is attached to at least one of the elongated metal elements.