Fuse Grounding Contact for Floating Circuit Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high-voltage electrical switchgear solutions require additional grounding switches or complex mechanisms, leading to increased complexity and risk of electrical hazards during fuse replacement, especially when the downstream section of the circuit remains floating and potentially charged.
Innovation Solution
A grounding device with an elastic element and conductive contact, installed inside the fuse casing, automatically grounds both upstream and downstream sections of the electrical circuit, ensuring safe access by connecting the floating section to ground when the fuse is removed or inserted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch with three operating positions is used to ground both sides of the fuse, then grounding safety is improved, but the device complexity increases due to additional mechanisms
Solution Approach 1:
The patent combines the grounding function for both upstream and downstream sides into a single switch mechanism with three positions. The switch integrates the functionality of what would otherwise require separate grounding switches, merging multiple grounding operations into one unified device that achieves dual-side grounding through its intermediate position.
Solution Approach 2:
The switch with three operating positions serves multiple functions: it can connect the upstream side to ground, connect the downstream side to ground, or connect both sides simultaneously. This multi-functional design eliminates the need for separate grounding switches, reducing overall device complexity while maintaining comprehensive grounding capability.
2Reliability
If an additional grounding switch is added downstream of the fuse, then both sides grounding is achieved, but the device dimensions increase
Solution Approach 1:
The patent merges the downstream grounding function into the existing upstream grounding switch by adding a third operating position. This eliminates the need for a separate downstream grounding switch, thereby reducing the overall volume and dimensions of the switchgear while achieving grounding of both sides.
Solution Approach 2:
The single switch is designed to perform multiple grounding functions: grounding the upstream side, grounding the downstream side, and grounding both sides simultaneously. This multi-functional approach replaces what would require multiple separate switches, reducing the overall equipment footprint.
3Ease of operation
If the downstream section remains floating during fuse replacement, then operational simplicity is maintained, but electrical safety deteriorates due to potential charging
Solution Approach 1:
The switch is designed to automatically establish grounding connections before the fuse replacement operation begins. When positioned in the intermediate state, it proactively grounds the downstream section in advance, preventing any potential charging that could occur during the fuse removal and insertion process, thereby eliminating electrical hazards while maintaining operational simplicity.
Solution Approach 2:
The grounding switch counteracts the potential harmful effect of downstream section charging by establishing a grounding connection beforehand. This preliminary anti-action prevents the accumulation of dangerous voltages during fuse replacement, neutralizing the electrical hazard before it can manifest.
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
Ensures safe and efficient grounding of both sides of the electrical circuit, reducing complexity and eliminating electrical risks during fuse replacement by automatically connecting the floating section to ground, enhancing safety and operational simplicity.
Implementation Method 1
the elastic element is compressed, so that the contact moves back towards the first connection point
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The grounding device (8) ensures protection against overloads and short circuits in electrical equipment and is used in electrical equipment installed in an enclosure (1) and is made up of a conductive elastic element (9) and a conductive contact (10), which are installed in the casing (4) of the protection element (3) and connected between the operating means (2) and the shunt bar (7) of the electrical circuit. During the removal of the protection element (3), the contact (10) moves towards the second electrical connection point (6) of the casing (4), which ensures that the electrical circuit between the operating means (2) and the casing (4) is grounded. When the protection element (3) is inserted, the contact (10) moves back until it comes to a stop with the first connection point (5), which guarantees that no section of the electrical circuit remains floating.