Externally Mounted Fuse Box for Liquid-Filled Transformers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The process of replacing fuses in liquid-filled transformers is inefficient and expensive due to the need for disassembly, contamination of transformer fluid, and extensive refurbishment, which prolongs downtime and reduces the transformer's lifespan.
Innovation Solution
An externally mounted fuse box for liquid-filled transformers that allows for efficient servicing by containing the fuse replacement process outside the transformer tank, minimizing liquid contamination and reducing the need for extensive refurbishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuses are mounted inside the liquid-filled transformer tank, then the transformer is protected from electrical faults, but the transformer liquid becomes contaminated with carbon and waste particles when fuses fail, requiring extensive disassembly and refurbishment
Solution Approach 1:
The fuse box is segmented from the main transformer tank into a separate, externally mounted unit. This segmentation allows the fuse containment chamber to be isolated from the transformer liquid, so that when fuses fail and contaminate the fuse box liquid, the main transformer liquid remains uncontaminated. The fuse box includes its own sealed environment with a gasketed opening that prevents contamination spread.
Solution Approach 2:
The fuse box is extracted from the interior of the transformer tank and mounted externally on the tank wall. This extraction removes the source of potential contamination (fuses) from direct contact with the transformer liquid, eliminating the harmful effect of liquid contamination while maintaining the protective function of the fuses.
2Ease of repair
If fuses are replaced by disassembling the transformer tank, then blown fuses can be replaced, but the process takes several days and involves draining thousands of gallons of contaminated liquid, making it expensive and inefficient
Solution Approach 1:
The fuse box is designed as a separable module that can be accessed independently from the main transformer. The gasketed opening allows the fuse box to be opened and fuses replaced without disassembling the entire transformer tank, dramatically reducing repair time from several days to a fraction of that time.
Solution Approach 2:
By extracting the fuse box from the transformer interior and mounting it externally, the repair process is simplified to only requiring access to the fuse box itself. This eliminates the need to drain thousands of gallons of liquid and disassemble the entire transformer, reducing both time and cost for fuse replacement.
3Ease of repair
If the transformer tank is disassembled for fuse replacement, then fuses can be accessed, but the sealed transformer tank must be refurbished and inspected, extending the maintenance process
Solution Approach 1:
The fuse box is segmented as a separate accessible module with a gasketed opening that can be opened independently. This allows fuse access without disrupting the sealed transformer tank, eliminating the need for complex refurbishment and inspection processes while maintaining easy access to fuses.
Solution Approach 2:
By taking out the fuse box from the transformer interior and mounting it externally with independent access, the complex refurbishment process is eliminated. The fuse box can be serviced without affecting the transformer tank's sealed integrity, greatly simplifying the maintenance process.
4Loss of substance
If contaminated liquid is drained and disposed of during fuse replacement, then the liquid is removed for proper disposal, but this creates environmental impact and increases maintenance costs
Solution Approach 1:
By extracting the fuse box from the transformer interior and isolating its liquid containment, the amount of liquid that becomes contaminated is reduced from thousands of gallons to only the small volume within the fuse box. This minimizes the substance loss requiring disposal and reduces environmental impact.
Solution Approach 2:
The fuse box is designed with a gasketed opening and sealed construction that prevents contamination from spreading to the transformer liquid. This preliminary protective measure prevents the harmful effect of widespread contamination, eliminating the need to drain and dispose of large volumes of contaminated liquid.
Data Source
AI summary
A fuse box mounted on a liquid-filled transformer is disclosed. The fuse box may include one or more fuse link assemblies securing one or more fuses within a base fuse box, a fuse holder coupling the one or more fuse link assemblies within the base fuse box, wherein the one or more fuse link assemblies are pulled-up from the fuse holder by hand to remove the one or more fuse link assemblies from the base fuse box. The fuse box may include a retaining ring to fasten the fuse holder to the one or more fuse link assemblies. The fuse box may include a method for servicing a fuse box on a liquid-filled transformer.