Vacuum Circuit Breaker Pre-Ignition Arc Path for Fast Fault Response
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Solution Overview
Problem
Existing high-voltage network protection systems, such as series compensation and load flow controllers, require rapid response to faults like short circuits, but current solutions using power semiconductors or spark gaps are costly, space-intensive, and vulnerable to environmental factors.
Innovation Solution
A vacuum power interrupter with a movable contact system and integrated pre-ignition device that forms an arc current path for quick fault current conduction, followed by mechanical closure of continuous current contacts, reducing installation space and environmental susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power semiconductors are used for network protection, then reliable fault current conduction is achieved, but the cost increases significantly due to design requirements for short-circuit current over long time
Solution Approach 1:
The current conduction path is segmented into two separate paths: an arc current path for fault current conduction and a continuous current path for normal operation. This segmentation allows each path to be optimized independently, enabling the use of simpler, less expensive components for fault protection while maintaining reliability.
Solution Approach 2:
An arc is introduced as an intermediary element to conduct fault current. The arc serves as a temporary conductor during fault conditions, allowing the system to handle short-circuit currents without requiring the continuous current-carrying components to be designed for such extreme conditions, thereby reducing cost.
2Reliability
If a parallel arrangement of spark gap and circuit breaker is used, then fault protection is provided, but the installation space becomes very large
Solution Approach 1:
The arc current path and continuous current path are merged into a single vacuum interrupter housing. The contact system integrates both functions within the same compact structure, eliminating the need for separate spark gap and circuit breaker assemblies, thereby significantly reducing installation space.
Solution Approach 2:
The arc current path components are nested within the same vacuum interrupter housing as the continuous current path components. The arc contacts and continuous contacts share the same vacuum environment and structural framework, creating a compact nested arrangement that minimizes space requirements.
3Speed
If a spark gap is used for fault protection, then rapid response is achieved, but the open design makes it vulnerable to environmental influences such as icing or dust contamination
Solution Approach 1:
Both the arc current path and continuous current path are housed within a vacuum interrupter, creating an inert vacuum environment that protects the contacts from environmental influences such as icing, dust, and moisture. This maintains the rapid response capability of the spark gap while eliminating environmental vulnerability.
Solution Approach 2:
The separation of arc current path and continuous current path allows the arc contacts to be optimized for rapid fault response while being protected in the vacuum environment, while the continuous contacts are optimized for normal operation. Each segmented path can be independently designed and protected.
4Speed
If arc contacts are used for fault current conduction, then rapid fault protection is achieved, but contact surface damage and welding may occur
Solution Approach 1:
The contact system is segmented into arc contacts for fault current conduction and continuous contacts for normal operation. The arc contacts are designed to withstand arc erosion during fault conditions, while the continuous contacts maintain their surface integrity for reliable normal operation. This segmentation prevents damage transfer to the continuous current path.
Solution Approach 2:
The arc acts as an intermediary that carries the fault current temporarily. During normal operation, the continuous contacts carry the current without arc exposure. This intermediary arrangement protects the continuous contacts from arc damage while still enabling rapid fault response through arc formation when needed.
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
Enables rapid and reliable establishment of electrical contact during short circuits, minimizing damage to network systems by quickly disconnecting from the power network and preventing undesirable contact surface welding.
Implementation Method 1
an electrical pre-ignition device is provided, which has an ignition electrode arranged in the power switching tube for igniting an arc along an arc current path
Implementation Method 2
A vacuum interrupter preferably has a high vacuum with a pressure of less than 10^-3
Data Source
Figure 1~2
Figure 3~6
Figure 7~8
AI summary
The invention relates to a vacuum circuit breaker with a vacuum circuit breaker tube (2) comprising a vacuum housing (4) in which a contact system (5) is arranged having two contacts (6, 8) which are movably arranged relative to each other, characterized in that an electrical pre-ignition unit (10) with an ignition electrode arranged in the vacuum housing for igniting an arc (16) along an arc current path (18) is provided.