Spark Gap Arrester With Offset Graphite Electrode Strips
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Solution Overview
Problem
Conventional isolating spark gaps experience wear and changes in electrode spacing due to repeated stress, leading to suboptimal response and insulation behavior, and require larger designs, which is undesirable.
Innovation Solution
The design features flat, rectangular electrodes with graphite electrodes spaced by a frame-like insulating film, having parallel protruding strips and grooves with offset edges, and a compact three-dimensional shape, along with identical electrodes rotated 180° for cost-effectiveness and secure assembly, using nickel-plated zamak castings and insulating sleeves for connecting screws, and an encapsulating plastic housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pin-shaped electrodes are used in isolating spark gaps, then the device can achieve potential equalization, but the electrodes are subject to constant wear and the distance between electrode and mating contact device changes, leading to degraded response behavior
Solution Approach 1:
The electrode is divided into multiple parallel strips instead of a single pin-shaped electrode. This segmentation allows the electrical function to be distributed across multiple strips, so that wear or damage to one strip does not completely degrade the electrode's functionality. The strip configuration maintains stable spacing while improving reliability.
Solution Approach 2:
The electrode strips are arranged with asymmetric spacing patterns where adjacent strips have different distances to their respective mating contact devices. This asymmetric design ensures that not all strips are affected equally by wear or thermal expansion, maintaining more consistent overall electrode spacing and response behavior over time.
2Volume of moving object
If conventional designs are used, then the isolating spark gap can function, but achieving compact size is difficult and the design requires larger dimensions
Solution Approach 1:
The electrode design transitions from a pin-shaped (1D) or planar (2D) configuration to a three-dimensional array of parallel strips. This dimensional change allows the electrodes to be packed more efficiently in space, achieving compact overall device size while maintaining sufficient insulation distance and reliable insulation behavior through the distributed strip structure.
3Reliability
If electrodes with elevations and depressions are used, then response behavior is improved, but manufacturing complexity increases and cost increases
Solution Approach 1:
Instead of creating complex three-dimensional elevations and depressions in the electrodes, the invention achieves improved response behavior by changing the two-dimensional parameter of strip arrangement and spacing. This parameter change maintains or improves response characteristics while significantly simplifying manufacturing, as flat strips can be easily fabricated and assembled compared to complex shaped electrodes.
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 configuration enhances response and insulation behavior, maintains low response voltage, and achieves a compact size while ensuring reliable and cost-effective construction and assembly.
Implementation Method 1
a spark gap arranged between the electrodes and an insulating material housing which surrounds the assembly composed of these components
Implementation Method 2
the contact surfaces of which resting on the graphite electrodes are preferably nickel-plated
Data Source
Figure 1~3
Figure 4~6
AI summary
The invention relates to an isolating spark gap as a potential equalization device with a first electrode (1), a second electrode (3), a spark gap arranged between the electrodes (1, 3) and an insulating housing (5) surrounding the assembly composed of these components, from which connecting parts (2, 4) project, wherein each electrode (1, 3) has a flat rectangular contact area (6) and a connecting part (2, 4) projecting from it on one side, both electrodes (1, 3) are stacked on top of each other with their contact areas insulated from each other and two graphite electrodes (9, 10) are arranged between the electrodes (1, 3), which are spaced apart from each other by a frame-like insulating film (11), and the mutually facing surface areas of the graphite electrodes (9, 10) have mutually parallel projecting strips (12) and grooves (13), wherein the strips (12) are slightly offset from each other.