Circuit Breaker Interrupter Gas Flow for Arc Cooling
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Solution Overview
Problem
Gas-insulated circuit breakers face dielectric weaknesses due to hot gas generated by electric arcs, which are not effectively cooled, leading to reduced performance and capacity for handling higher currents.
Innovation Solution
A gas-guiding structure within the circuit breaker's interrupter unit, featuring a guide tube and diverting elements that create a circular flow of hot gas away from the arc region, mixing it with cold quenching gas for improved cooling through turbulent mixing, enhancing dielectric strength and allowing for higher current handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot gas is cooled only by axial or radial flow, then the cooling process is simple, but the cooling efficiency is insufficient and dielectric strength is reduced
Solution Approach 1:
The patent introduces a circular flow component in addition to the axial flow, transforming the cooling process from one-dimensional (axial) to two-dimensional (axial + circular). The guide tube directs hot gas axially away from the arc region, while diverting elements generate circular flow around the longitudinal axis, creating a combined flow pattern that enhances cooling efficiency and utilizes housing volume more effectively
Solution Approach 2:
The guide tube and diverting elements act as intermediary structures that mediate between the hot gas source (arc region) and the cooling medium (cold quenching gas). The guide tube serves as an intermediary channel to transport hot gas, while diverting elements serve as intermediaries to transform the flow direction and generate circular motion, facilitating efficient heat exchange
2Power
If the housing volume is not fully utilized for cooling, then the structure is simple, but the cooling capacity is limited and cannot handle higher currents
Solution Approach 1:
By adding the circular flow dimension to the axial flow, the patent expands the cooling path and increases the volume of housing utilized for cooling. The circular flow pattern allows cold quenching gas to penetrate more effectively into the hot gas region from multiple directions, maximizing the use of available housing volume for heat dissipation and enabling higher current handling capacity
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 circular flow guidance effectively cools hot gas, increasing the dielectric strength of the interrupter unit and enabling it to handle higher currents by better utilizing the housing volume for cooling, thus improving overall performance.
Implementation Method 1
The quenching gas is locally intensely heated by an electric arc in the electric arc region and dissociates to form a hot gas
Implementation Method 2
hot gas is mixed, in a region remote from the electric arc region in the housing of the diverting element, with relatively cold quenching gas located there by the circular flow and cooled down by so-called turbulent cooling
Implementation Method 3
The quenching gas is locally intensely heated by an electric arc in the electric arc region and dissociates to form a hot gas
Data Source
AI summary
An interrupter unit for a circuit breaker includes a gas-insulated housing, which is fillable with a quenching gas, and a gas-guiding structure, which is disposed in the housing and has a guide tube and at least one diverting element. The guide tube extends in tubular manner about a longitudinal axis of the interrupter unit in order to guide hot gas, which is created in an electric arc region of the interrupter unit by the heating of quenching gas by an electric arc, away from the electric arc region. The at least one diverting element is configured to set hot gas exiting from the guide tube in a circular flow running around the longitudinal axis.