Gas Insulated Bus Expanded Diameter Heat Dissipation
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Solution Overview
Problem
Existing gas insulated buses face challenges in reducing size while maintaining insulation and conductivity performance, and existing particle conditioning methods are unreliable and inefficient, especially for long bus lengths.
Innovation Solution
A gas insulated bus design with an expanded diameter part near the insulator and a reduced diameter part elsewhere, along with insulation coatings, to manage heat and electric fields, and a particle removal method involving an inclined metal container to accelerate particle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the metal container is reduced to make the gas insulated bus smaller, then the size of the gas insulated bus is reduced, but the temperature of the insulating spacer part increases excessively
Solution Approach 1:
The metal container is designed with non-uniform diameter: a first diameter in the first region (near insulating spacers) and a second diameter in the second region (away from insulating spacers), where the first diameter is larger than the second diameter. This local variation in geometry allows the region near insulating spacers to maintain lower temperatures while other regions can be more compact, thus resolving the contradiction between overall size reduction and local temperature control.
2Reliability
If a particle trap with low electric field strength is formed in the metal container to facilitate particle motion, then particle conditioning is enabled, but the insulation performance is degraded
Solution Approach 1:
The metal container has different diameters in different regions, creating localized electric field variations. The first region with larger diameter near insulating spacers provides conditions for particle accumulation with reduced electric field stress, while the second region maintains higher electric field strength for insulation. This spatial differentiation allows particle conditioning without compromising overall insulation performance.
3Object-affected harmful factors
If the diameter of the metal container is reduced to satisfy insulation performance requirements, then the insulation capability is maintained, but the conductivity performance and temperature control are worsened
Solution Approach 1:
By making the first diameter larger than the second diameter, the design creates a local expansion near insulating spacers that improves heat dissipation in the critical region where temperature control is most important for conductivity performance, while maintaining compact overall dimensions for insulation 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
The design reduces the size of the gas insulated bus while ensuring reliable insulation and conductivity performance, and the particle removal method shortens operation time by efficiently trapping and removing particles.
Implementation Method 1
a particle trap with a low electric field strength is formed in the metal container and in which before operation, a voltage lower than an operating voltage is applied to a high-voltage conductor in a stepwise fashion to allow a particle to float and accumulate in the particle trap
Implementation Method 2
a conductor (high-voltage conductor) supported by an insulator is coaxially accommodated in a cylindrical grounded metal container in which insulating gas (typically SF6 gas) is contained
Data Source
AI summary
The present invention is provided to satisfy insulation and conductivity performance requirements, to reduce the size of a gas insulated bus, and also to make conditioning for a particle more reliable. In a gas insulated bus having a conductor supported in a cylindrical metal container via an insulator, insulating gas being contained in the metal container, the metal container has an expanded diameter part formed over a given range in an area of the metal container in which the insulator is positioned and a reduced diameter part formed over the entire area of the metal container except for the expanded diameter part. Thus, when the temperature of the insulator increases during conduction, heat from the insulator is transferred to the metal container via a large space in the expanded diameter part and released to the air through a large outer surface of the expanded diameter part of the metal container.