DC Switch Limiting Pole for High-Current Arc Interruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high-voltage direct current electrical switches, particularly those above 2000A and 1500V, used in photovoltaic installations, face reliability issues and insufficient current breaking capacity due to inadequate arc control and current interruption capabilities.
Innovation Solution
A high-voltage direct current multipole electrical switch with a novel limiting pole design, featuring dual arcing chambers, magnetic circuits, and a switching mechanism that allows for series current interruption, effectively managing electric arcs and increasing breaking capacity by directing arcs into separate chambers for treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arc-suppression techniques (magnetic circuits, cut-off chambers, separators, spark arresters, arc horns) are used, then arcs can be controlled up to certain voltage and current levels, but the reliability and current interruption capacity are insufficient for high-voltage (1500V) and high-current (over 2000A) applications
Solution Approach 1:
The switch is divided into multiple independent poles (limiting pole and conducting poles), with each pole having separate arc-forming chambers and interruption chambers. This segmentation allows each chamber to handle specific arc interruption tasks, improving overall reliability while distributing the complexity across modular units rather than concentrating it in a single complex structure.
Solution Approach 2:
A dedicated limiting pole is introduced as an intermediary element between the power source and the load. This limiting pole with its specialized dual-chamber structure (arc-forming chamber and interruption chamber) acts as a mediator that handles the high-voltage arc interruption, protecting the main switch body and improving reliability without requiring the entire switch structure to be overly complex.
2Reliability
If conventional single-chamber arc interruption design is used, then the structure is simpler, but the current breaking capacity is insufficient for high-voltage DC applications
Solution Approach 1:
The arc interruption process is segmented into two distinct chambers: an arc-forming chamber where the arc is initially created and controlled, and an interruption chamber where the arc is finally extinguished. This segmentation allows each chamber to be optimized for its specific function, enabling the switch to handle high-voltage DC current interruption reliably while keeping each individual chamber's structure manageable.
Solution Approach 2:
The patent transitions from a single-dimensional arc interruption approach to a two-dimensional approach by introducing separate spatial chambers for arc formation and interruption. This dimensional change allows the arc to be managed through a multi-stage process across different spatial zones, increasing breaking capacity without requiring excessive complexity within a single chamber.
3Reliability
If all poles operate simultaneously without differentiation, then the switching mechanism is simpler, but the control over arc management and current interruption is insufficient
Solution Approach 1:
Different poles are assigned different functional qualities: the limiting pole is specifically designed with dual chambers for high-voltage arc interruption, while conducting poles have simpler structures optimized for current conduction. This local differentiation allows each pole to be optimized for its specific role, improving overall arc control capability while avoiding unnecessary complexity in poles that don't require it.
Solution Approach 2:
The limiting pole serves multiple functions: it provides the primary arc interruption path for high-voltage DC, houses both arc-forming and interruption chambers, and works in coordination with the conducting poles. This multi-functionality in a dedicated limiting pole improves arc control capability without requiring every pole to be equally complex, as each pole type is optimized for its specific functions.
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 solution enhances the reliability and current breaking capacity of high-voltage switches, enabling safe interruption of up to 1500V, specifically beneficial for photovoltaic farms by dividing electric arcs and treating them separately, thereby improving overall switch performance.
Implementation Method 1
a magnetic circuit including a magnet and generating a magnetic field configured to guide, towards the breaking chamber (40; 42) associated with that arc-forming chamber (36; 38), an electric arc forming in the open position between the contacts provided in that arc-forming chamber (36; 38)
Implementation Method 2
an electric arc forming in the open position between the contacts provided in that arc-forming chamber (36; 38)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This limiting pole (B) of a multi-pole DC electrical switch (2) comprises a compartment in which are provided an input terminal and an output terminal of a DC electrical current, a first electrical contact connected to the input terminal and a second electrical contact connected to the output terminal, a third and a fourth electrical contacts connected to each other in series, the third and fourth contacts being respectively movable simultaneously with respect to the first and second electrical contacts, between a closed position, in which the first and third contacts and the second and fourth contacts are in contact with each other to allow the flow of DC electrical current between the input terminal and the output terminal, and an open position, in which said contacts are separated from each other interrupting the flow of current between the input terminal and the output terminal.The limiting pole (B) comprises a first arc-forming chamber in which the first and third electrical contacts are placed, a second arc-forming chamber in which the second and fourth electrical contacts are placed, and a first and second arc-breaking chamber, respectively associated with the first and second arc-forming chambers.