Low-Voltage Switch Pole Arc Chamber for Uniform Arc Distribution
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Solution Overview
Problem
Low voltage switching devices face issues with uneven distribution of electric arcs among arc-breaking plates, leading to inefficient arc-quenching and increased mechanical and thermal stresses, which can result in premature degradation and damage to components outside the arc-extinguishing area.
Innovation Solution
A switch pole design featuring an insulating casing with a channel connecting the contact area to the arc-extinguishing area, including a terminal arc-breaking plate and an additional arc-breaking element anchored to the insulating wall, ensuring uniform arc distribution and preventing arcs from jumping to outside components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arc chamber design is used, then arc-breaking plates are present to extinguish arcs, but uneven distribution of electric arcs among arc-breaking plates occurs leading to inefficient arc-quenching
Solution Approach 1:
The arc chamber is segmented into multiple zones with arc-breaking plates arranged at different positions and orientations. The partition wall divides the arc chamber into first and second arc-extinguishing zones, creating a more distributed arc path that ensures arcs engage with multiple arc-breaking plates uniformly, improving arc-quenching efficiency.
Solution Approach 2:
Arc-breaking plates are arranged not only in series but also in parallel configurations across different spatial dimensions. The partition wall creates additional spatial separation, forcing arcs to travel through a more complex three-dimensional path that intersects with multiple arc-breaking plates, ensuring more uniform arc distribution.
2Reliability
If arc-breaking plates are positioned near electric contacts, then arcs can be extinguished, but electric arcs may bypass some arc-breaking plates causing uneven stress distribution
Solution Approach 1:
The arc chamber is divided into multiple zones by partition walls, creating a segmented path for arc propagation. This segmentation ensures that arcs must pass through multiple restricted channels, each containing arc-breaking plates, thereby distributing mechanical and thermal stresses more evenly across all arc-breaking plates and preventing any single plate from bearing excessive stress.
Solution Approach 2:
Partition walls act as intermediaries that guide and constrain arc paths between the electric contacts and the arc-breaking plates. These partition walls force arcs to follow specific trajectories that ensure interaction with multiple arc-breaking plates, preventing arcs from bypassing plates and causing uneven stress concentration.
3Reliability
If arc-breaking plates are used to cool and split arcs, then currents can be broken, but arcs may jump towards conductive parts outside the arc-extinguishing area causing damage
Solution Approach 1:
The partition wall structure extracts and isolates the arc-containing zones from the rest of the switch pole. By creating dedicated arc-extinguishing zones separated by insulating partition walls, the design prevents arcs from jumping to external conductive parts, as the partition walls act as physical barriers that confine arcs within the arc chamber boundaries.
Solution Approach 2:
Insulating partition walls serve as intermediaries between the arc-extinguishing area and external conductive components. These partition walls intercept and contain arcs within the arc chamber, preventing direct contact with external components and thereby protecting them from electric and thermal stresses.
4Power
If switching devices operate at high voltages (1-1.5 kV), then power distribution capability is improved, but electric arcs with higher energy content arise causing more severe stresses
Solution Approach 1:
The arc chamber is segmented into multiple zones with partition walls, creating a distributed arc path that lengthens the overall arc trajectory. This segmentation allows the arc energy to be dissipated across multiple arc-breaking plates and partition surfaces, reducing the thermal concentration at any single point and enabling the device to handle higher voltage operations.
Solution Approach 2:
The partition wall structure adds spatial dimensions to arc extinction, forcing arcs to travel through a more complex three-dimensional path rather than a direct linear path. This multi-dimensional arc path increases the effective arc length and distributes thermal energy across a larger volume, reducing peak temperatures and enabling higher voltage operation.
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 uniform utilization of arc-breaking plates, reduces mechanical and thermal stresses, and prolongs the lifespan of the arc chamber while preventing arcs from striking outside components, thereby enhancing the reliability and efficiency of the switching device.
Implementation Method 1
The insulating wall includes a channel passing through said insulating wall and connecting said contact area to said arc-extinguishing area
Implementation Method 2
an arc chamber including a number of arc-breaking plates positioned near the electric contacts and designed to cool and split possible electric arcs
Implementation Method 3
electric arcs may arise between the electric contacts under separation of the switch poles
Data Source
AI summary
Described herein is a switch pole for a low voltage switching device including an insulating casing defining an internal space with a contact area and an arc-extinguishing area of the switch pole, a fixed contact assembly and a movable contact assembly positioned in the contact area and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled, and an arc chamber positioned in the arc-extinguishing area that includes a plurality of parallel arc-breaking plates. The insulating casing includes an insulating wall partially separating the contact area from the arc-extinguishing area and a channel connects the contact area to the arc-extinguishing area. The switch pole further includes an additional arc-breaking element anchored to the insulating wall, passing through the channel of the insulating wall and arranged in electrical connection with a terminal arc-breaking plate of the arc chamber.