Switchgear Pressure Release Duct Layout for Arc Energy Isolation
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Solution Overview
Problem
Conventional gas-insulated switchgear designs face issues where a common pressure release duct for the main circuit and cable chambers requires the cable chamber's pressure release plate to withstand higher arc energies, leading to increased cost and weight due to stronger construction, and the plate may fail to operate for lower arc energies, causing pressure buildup.
Innovation Solution
The switchgear incorporates separate pressure release plates for the main circuit and cable chambers, with the first plate opening to the duct from the main circuit chamber and a second plate opening from the cable chamber, featuring a closing portion between these openings to maintain independence and reduce influence on the cable chamber, allowing for lighter and cheaper construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of the pressure release plate on the cable chamber side is increased to withstand first arc energy from the main circuit chamber, then the plate can endure higher arc energy, but the cost and weight increase
Solution Approach 1:
The pressure release duct is divided into two separate chambers: a main circuit chamber for handling high-energy arc events and a cable chamber for low-energy operations. This segmentation allows each chamber to have optimized pressure release plates with appropriate strength for their specific function, preventing the cable chamber plate from needing to withstand main circuit arc energies.
Solution Approach 2:
The harmful factor (high arc energy from main circuit) is extracted and isolated from the cable chamber by providing separate pressure release pathways. The main circuit chamber's pressure release plate handles the high arc energy, while the cable chamber's plate only deals with its own lower energy events, eliminating the need for excessive strength in the cable chamber plate.
2Strength
If the strength of the pressure release plate on the cable chamber side is increased to withstand first arc energy, then the plate can endure higher arc energy, but the cost increases
Solution Approach 1:
The pressure release system is segmented into two independent chambers with separate pressure release plates. The cable chamber plate only needs to withstand second arc energy levels, allowing for cheaper material selection and manufacturing processes compared to a unified design where the plate would need to handle first arc energy.
Solution Approach 2:
Each pressure release plate is designed with local quality appropriate to its chamber's requirements. The main circuit chamber plate has high strength to withstand first arc energy, while the cable chamber plate has lower strength sufficient for second arc energy, optimizing material usage and reducing overall manufacturing cost.
3Weight of stationary object
If the pressure release plate on the cable chamber side is made with lighter construction to reduce cost and weight, then cost and weight decrease, but the plate may fail to operate when second arc energy is released
Solution Approach 1:
By segmenting the pressure release system into separate chambers, the cable chamber plate only needs to handle second arc energy events. This allows the plate to be designed with lighter construction and lower strength materials while maintaining sufficient reliability for cable chamber pressure release operations.
Solution Approach 2:
The cable chamber pressure release plate is designed with local quality optimized for its specific function - lighter construction with appropriate strength for second arc energy levels. This ensures reliable operation for cable chamber pressure release without the excessive weight and cost of a design intended for first arc energy.
4Device complexity
If a common pressure release duct is used for both main circuit and cable chambers, then device complexity is reduced, but the cable chamber is affected by pressure release from the main circuit chamber
Solution Approach 1:
The pressure release duct is segmented into separate main circuit chamber and cable chamber sections with independent pressure release plates. This segmentation prevents pressure waves and arc energy from the main circuit chamber from affecting the cable chamber, as each chamber has its own controlled pressure release pathway.
Solution Approach 2:
The harmful influence (pressure release effects from main circuit) is extracted and contained within the main circuit chamber's own pressure release pathway. The cable chamber has its own separate pressure release mechanism, isolating it from the harmful effects of main circuit pressure events.
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 design ensures effective pressure release from the main circuit chamber without affecting the cable chamber, reducing costs and weight while maintaining operational efficiency.
Implementation Method 1
a first pressure release plate covering a first opening provided on a first wall surface partitioning the main circuit chamber and the duct; and a second pressure release plate covering a second opening provided on a second wall surface partitioning the cable chamber and the duct, wherein the first pressure release plate is configured to open the first opening by an increase in pressure in the main circuit chamber so as to communicate the main circuit chamber and the duct
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a switchgear (100), a main circuit chamber (1) and a cable chamber (2) are partitioned from each other and provided in a casing (9). A first pressure release plate (1D) that covers a first opening (1H) provided on a first wall surface (1W) partitioning the main circuit chamber (1) and a duct (6), and a second pressure release plate (2D) that covers a second opening (2H) provided on a second wall surface (2W) partitioning the cable chamber (2) and the duct (6) are provided. The first pressure release plate (1D) is configured to communicate the main circuit chamber (1) and the duct (6) by an increase in pressure in the main circuit chamber. The first opening (1H) is provided between a discharge port (6H) inside the duct (6) and the second opening (2H), and the first pressure release plate (1D) constitutes a closing portion (50) that closes a passage of the duct (6) inside the duct (6) according to the pressure increase in the main circuit chamber (1).