Insulating Barrier Switching Assembly for High-Voltage DC Arc Interruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromechanical switching apparatuses for low- or medium-voltage electrical systems face challenges in providing satisfactory interruption ratings, particularly for DC currents at high voltages, leading to long opening times and dangerous electric arcs, and are often large and expensive due to the need for series connections.
Innovation Solution
A switching apparatus with a movable barrier structure and synchronized kinematic assemblies that interpose an insulating barrier between electric contacts during opening, redirecting arcs to an arc-extinguishing chamber, and using time-delayed actuation to reduce size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromechanical switching apparatuses are used for high-voltage DC currents, then galvanic isolation is ensured, but opening time becomes relatively long leading to dangerous electric arcs
Solution Approach 1:
The patent extracts the arc-quenching function from the main switching mechanism by introducing a dedicated movable barrier structure that independently manages arc extinction. This barrier structure can move to intercept and extinguish arcs without being constrained by the opening speed of the main contacts, thereby resolving the contradiction between maintaining galvanic isolation and reducing opening time.
Solution Approach 2:
The movable barrier structure acts as an intermediary element between the separating contacts and the arc path. It intercepts and redirects arcs into the arc-extinguishing chamber, mediating the harmful arc effect while allowing the main switching mechanism to focus on achieving rapid disconnection and galvanic isolation.
2Reliability
If multiple switch poles are connected in series for high voltages, then interruption rating is improved, but device size and manufacturing cost increase
Solution Approach 1:
The patent merges the arc-quenching function into a single integrated chamber that can handle high-voltage interruption requirements. By combining multiple arc-extinguishing zones within one chamber and using a unified movable barrier structure, the design achieves high interruption ratings without requiring multiple separate switch poles, thereby reducing device size and complexity.
Solution Approach 2:
The patent transitions from a horizontal arrangement of multiple switch poles to a vertical arrangement within a single chamber. The movable barrier structure moves vertically to manage arcs from horizontally separating contacts, utilizing three-dimensional space efficiently to achieve high-voltage interruption capability in a compact form factor.
3Temperature
If electromechanical switching apparatuses operate at high voltages, then system voltage capability is improved, but electric arc energy increases causing damage to conductive parts
Solution Approach 1:
The patent converts the harmful high-energy arcs into a controlled phenomenon by directing them into the arc-extinguishing chamber. The movable barrier structure intercepts arcs and channels them through a controlled path where they can be safely extinguished, transforming the destructive arc energy into a manageable process that protects other conductive parts from damage.
Solution Approach 2:
The movable barrier structure serves as a protective intermediary that stands between the high-voltage arc and other conductive components. It absorbs and redirects arc energy into the dedicated extinguishing chamber, preventing arcs from striking and damaging other parts of the switching apparatus.
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 apparatus achieves efficient interruption ratings for high-voltage DC currents with reduced size and manufacturing costs, minimizing arc damage and ensuring safe, compact operation.
Implementation Method 1
Electric arcs, which usually strike between electric contacts under separation, may consequently last for a long time
Implementation Method 2
redirecting arcs to an arc-extinguishing chamber
Data Source
AI summary
The present disclosure relates to a switching apparatus for low or medium voltage electrical systems, wherein said switching apparatus comprising one or more switch poles. For each switch pole, said switching apparatus comprises a first pole terminal and a second pole terminal couplable with corresponding conductors of an electric line. Additionally, for each switch pole, the switching apparatus further comprises a fixed contact assembly including at least a fixed contact member electrically connected to said first pole terminal and a movable contact assembly including at least a movable contact member electrically connected to said second pole terminal. Furthermore, for each switch pole, the switching apparatus additionally comprises a movable barrier structure including at least a barrier member made of an electrically insulating material.