Oval Interrupter Layout in Three-Phase Gas-Insulated Circuit Breakers
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Solution Overview
Problem
Existing gas-insulated circuit breakers face challenges in providing simple mechanical connections while maximizing interrupting capabilities due to the interference of electric fields with interrupter connections, limiting the dimension and space between interrupters.
Innovation Solution
The interrupters in the three-phase gas-insulated circuit breaker have a non-circular cross-section, such as oval or elliptic, allowing for increased accommodation of insulating gas and improved exhaust performance, with arrangements like linear or triangular configurations to optimize mechanical and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If interrupters are arranged in a triangular manner to increase open space between them, then the spacing between interrupters is improved, but the dimension of interrupters is limited due to electric field interference with connections
Solution Approach 1:
The patent applies asymmetry by changing the interrupter cross-section from a conventional circular shape to an oval shape with length at least 10% greater than width. This asymmetric geometry allows the interrupter to accommodate more insulating gas volume while maintaining appropriate spacing in triangular arrangements, resolving the conflict between open space requirements and interrupter dimensions by optimizing the shape rather than relying solely on increased spacing.
2Ease of manufacture
If interrupters have circular cross-section to simplify mechanical connection, then manufacturing simplicity is improved, but insulating gas accommodation volume is limited reducing interrupting capability
Solution Approach 1:
The patent applies parameter changes by modifying the cross-sectional geometry parameters of the interrupter from a circular shape (equal width and length) to an oval shape where length is at least 10% greater than width. This parameter change increases the gas accommodation volume while maintaining manufacturing feasibility through standardized oval-shaped components, thereby improving interrupting capability without excessively complicating the manufacturing process.
3Reliability
If interrupter volume is increased to accommodate more insulating gas for improved exhaust performance, then interrupting capability is improved, but the enclosure space requirements increase
Solution Approach 1:
The patent applies asymmetry by using oval-shaped interrupters with length at least 10% greater than width, which optimizes the volume-to-cross-sectional-area ratio. This asymmetric shape allows the interrupter to accommodate more insulating gas volume for improved exhaust performance and interrupting capability while occupying less overall enclosure space compared to a circular interrupter of equivalent gas volume, thus resolving the contradiction between reliability improvement and enclosure space requirements.
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 enhances the interrupting capability and accommodates more insulating gas, improving the circuit breaker's performance and handling higher voltage ratings.
Implementation Method 1
an insulating gas such as SF6 or alternatives... which enables to adequately extinguish an electric arc formed between contact elements of the interrupter during a current interruption operation
Implementation Method 2
a dielectric insulation medium, may be a dielectric insulation gas... The interrupters are usually installed within a tank as enclosure in a linear or triangle manner
Data Source
Figure 1a~1b
Figure 2a~2c
AI summary
The invention relates to a three-phase gas-insulated circuit breaker comprising a longitudinally extending enclosure (1) defining an axis (2) and three longitudinally, parallel to the axis (2) extending interrupters (3) arranged distant to each other within the enclosure (1) and comprising a radially extending cross-section having a length (6) and a width (7), whereby the length (6) is at least 10% greater than the width (7).