Gas Insulated Switchgear Insulator Outer Diameter Variation
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Solution Overview
Problem
Existing gas insulated switchgears face challenges in achieving sufficient electric field relaxation, particularly with the current transformer mounting cylindrical body, leading to larger sizes and inadequate insulation performance.
Innovation Solution
The design incorporates a ground tank with a current transformer mounting cylindrical body, a porcelain bushing, and a main circuit conductor, along with an insulator and ground shield that extend beyond the current transformer mounting cylindrical body, increasing the insulator's outer diameter in specific regions to enhance insulation and reduce device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure insulating gas is filled in pressure tanks and bushings to achieve insulation properties, then insulation performance is improved, but electric field relaxation cannot be sufficiently achieved and device size increases
Solution Approach 1:
The patent applies local quality by varying the insulator outer diameter at different locations along the insulator. Specifically, the insulator has a first outer diameter in a first region and a second outer diameter in a second region, where the diameters are different. This localized variation optimizes the electric field distribution at critical positions without requiring uniform increase of the entire insulator size, thus achieving sufficient electric field relaxation while controlling overall device size.
Solution Approach 2:
The patent changes the geometric parameter of the insulator by providing different outer diameters at different regions. This parameter change allows the insulator to better control the electric field distribution, achieving sufficient electric field relaxation without requiring high pressure insulating gas, thereby reducing device size while maintaining insulation performance.
2Reliability
If the current transformer mounting cylindrical body portion is enlarged to achieve sufficient electric field relaxation, then electric field relaxation is improved, but the current transformer and overall device become larger in size
Solution Approach 1:
The patent applies local quality by making the insulator outer diameter vary at specific locations rather than uniformly increasing the current transformer mounting cylindrical body. The insulator has enlarged outer diameters at first and second regions, which locally enhance electric field relaxation without requiring the entire current transformer assembly to be larger.
3Reliability
If epoxy resin is coated on conductors in bushings to achieve electric field relaxation, then some insulation improvement is achieved, but sufficient electric field relaxation cannot be achieved
Solution Approach 1:
The patent replaces the epoxy resin coating approach with a structural solution - varying the insulator outer diameter at different regions. This geometric variation of the insulator provides the necessary electric field relaxation without requiring additional coating materials or complex surface treatments, thereby achieving sufficient relaxation while maintaining structural simplicity.
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
This configuration achieves a reduction in size and weight of the gas insulated switchgear while enhancing insulation performance, allowing for lower high-pressure gas pressure and reduced costs.
Implementation Method 1
a ground tank which houses a circuit breaker and is filled with insulating gas
Implementation Method 2
an insulator which is provided extending further downward than the lower end of the current transformer mounting cylindrical body and increasing its extended insulator outer diameter than an insulator outer diameter located in the current transformer mounting cylindrical body... and a ground shield which is arranged in the insulator
Data Source
AI summary
A gas insulated switchgear includes a transformer mounting body; a bushing mounted on the transformer mounting body; and a main circuit conductor. The main circuit conductor includes a first main circuit conductor which is connected to a circuit breaker and is located in the bushing and a second main circuit conductor which is connected to the first main circuit conductor. An insulator extends below the lower end of the transformer mounting body and toward the vicinity of the connection between the first main circuit conductor and the second main circuit conductor, in a region where the first main circuit conductor is located in the transformer mounting body. A ground shield is arranged in the insulator, and extends below the lower end of the transformer mounting body and above a coupling portion between the transformer mounting body and the bushing.