High-Voltage Circuit Breaker Particle Trap for Insulation Reliability
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Solution Overview
Problem
High-voltage circuit breakers face issues with particle generation and dust accumulation during mechanical switching, leading to insulation deterioration and potential flash-overs due to the accumulation of conductive particles on insulator surfaces.
Innovation Solution
The implementation of a particle trap system integrated into the insulator flanges, positioned radially outward from the central axis, which captures particles through gravity and prevents them from escaping, using a metal shield to protect the trap from electric fields, ensuring the particles remain trapped and do not interfere with the insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particles are allowed to move freely in the circuit breaker, then the structure remains simple, but insulation performance deteriorates due to particle accumulation on insulator surfaces
Solution Approach 1:
The particle trap is integrated within the existing insulator structure, specifically utilizing the insulator flange area. The trap is positioned radially outward from the central axis, nested within the overall insulator assembly, thereby adding particle containment functionality without significantly increasing external dimensions or structural complexity.
Solution Approach 2:
The particle trap acts as an intermediary structure between the particles and the insulator surface. By providing a dedicated containment area with shielding, it prevents direct contact between particles and the insulator, thereby protecting insulation performance without requiring complete particle elimination.
2Reliability
If a particle trap is added to contain particles, then insulation performance improves, but device complexity increases
Solution Approach 1:
The insulator flange serves dual purposes: maintaining the mechanical integrity of the insulator and housing the particle trap. By utilizing existing structural elements for multiple functions, the design adds particle containment capability while minimizing increases in overall device complexity.
Solution Approach 2:
The particle trap is merged with the insulator flange structure rather than being a separate component. This integration combines the structural support function with the particle containment function, reducing the number of discrete parts and simplifying the overall device architecture.
3Reliability
If particles are trapped radially outward from the central axis, then particles are securely contained, but the insulator inner surface is farther from the central axis
Solution Approach 1:
The particle trap utilizes the radial dimension outward from the central axis to create containment space. By extending the trap radially rather than axially or circumferentially, the design achieves effective particle containment while minimizing the impact on the insulator inner surface positioning and maintaining compact overall dimensions.
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 particle trap effectively prevents particle accumulation near insulation gaps, maintaining insulation integrity and enhancing the circuit breaker's performance by securely containing particles and dust, thus reducing the risk of flash-overs and improving operational reliability.
Implementation Method 1
The particle trap may comprises a pocket, the pocket being located behind the insulator when seen radially outwards from the central longitudinal axis. In this case, particles cannot easily move from the pocket back towards an inner surface of the insulator. The pocket may be shielded from an electric field by a metal shield being located between the pocket and the insulator.
Implementation Method 2
The particle trap may be located at a lowermost portion of the insulator flange, wherein the lowermost portion is lowermost in regard of gravity in an installation position of the circuit breaker. Thereby, the particles can enter the particle trap due to gravity and are prevented by gravity from leaving the particle trap.
Data Source
AI summary
A high-voltage circuit breaker comprises a first main contact and a second main contact extending along a central longitudinal axis and being at least partially enclosed by an insulator, wherein the insulator has an inner surface facing the central longitudinal axis and being arranged at a first distance from the central longitudinal axis, and further comprises at least one particle trap for trapping particles generated during operation of the circuit breaker, wherein the particle trap has an inner surface facing the central longitudinal axis and being arranged at a second distance from the central longitudinal axis, the second distance being larger than the first distance.