Compact Spark Gap With Nested Electrodes For High Current Protection
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Solution Overview
Problem
Existing spark gaps for protecting supply lines and AC networks against lightning are complex, expensive, and bulky, with inadequate current-carrying capacity and quenching behavior.
Innovation Solution
A compact spark gap design featuring a cavity surrounded by connection electrodes and an electrical insulator, with a pin electrode protruding into a tubular electrode, and stiffening electrodes for improved stability and heat dissipation, filled with a gas mixture for enhanced quenching behavior and dynamic ignition conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air spark gaps with trigger devices are used for high current and voltage protection, then current-carrying capacity is improved, but device complexity and size increase
Solution Approach 1:
The spark gap is divided into multiple cavities (first cavity and second cavity) separated by an insulator, with each cavity containing its own electrodes. This segmentation allows the device to handle high currents while maintaining a compact and simple overall structure, avoiding the need for complex trigger devices.
Solution Approach 2:
The electrodes are designed with nested geometries where one electrode is positioned within or adjacent to another cavity, creating a compact arrangement that maximizes current-carrying capacity within a small footprint, eliminating the need for bulky trigger mechanisms.
2Volume of moving object
If compact spark gap design is implemented, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The insulator is designed with localized features such as beads or protrusions at specific positions that provide precise mechanical guidance for the electrodes. This localized precision feature allows the overall device to remain compact while maintaining accurate electrode positioning without requiring high precision throughout the entire manufacturing process.
Solution Approach 2:
The insulator structure itself provides the guidance function through its geometric features (beads, protrusions), eliminating the need for separate guidance mechanisms. The electrodes self-align during assembly due to these built-in guidance features, reducing manufacturing precision requirements while maintaining compact dimensions.
3Reliability
If connection electrodes are made thin and highly conductive, then electrical properties are improved, but mechanical stability decreases
Solution Approach 1:
The connection electrodes are constructed as composite structures combining thin, highly conductive materials for electrical performance with thicker, mechanically stronger materials or reinforcement features for stability. This composite approach allows the electrodes to maintain both excellent electrical properties and mechanical strength simultaneously.
Solution Approach 2:
The electrodes feature curved or rounded geometries rather than sharp edges, which distributes mechanical stresses more evenly and improves structural stability. The curved surfaces also maintain good electrical conductivity while providing inherent mechanical strength, eliminating the need for thick rigid structures.
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 compact design improves current-carrying capacity and dynamic ignition conditions, ensuring stable and efficient discharge of high currents while maintaining structural integrity and insulation properties.
Implementation Method 1
A spark gap is proposed with a cavity that is surrounded by two connection electrodes and an electrical insulator arranged between them. The spark gap has a pin electrode protruding into a tubular electrode
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A spark-discharge gap (1; 21; 50) having a cavity (3; 23; 43), which is surrounded by two connecting electrodes (7a, 7b; 27a, 27b; 47a 47b) and an electrical insulator (2; 22; 42) arranged in between, and having a pin electrode (4; 24; 44) which projects into a tubular electrode (5; 25; 45) is disclosed. In one form, recesses (11; 41) in the connecting electrodes are provided on the side next to the cavity (3; 43), and a guide for the connecting electrodes is provided on the inner wall of the insulator. In another form, stiffening electrodes (12a, 12b; 27c, 27d) are provided which are respectively connected to one of the connecting electrodes. Both forms can be combined.