Shear Pin Bursting Device for High-Voltage Transformers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bursting devices for high-voltage transformers are prone to false triggering due to material fatigue and sensitivity to external influences, leading to high maintenance costs and unpredictable pressure relief, especially when exposed to aggressive oils and accidental damage during maintenance.
Innovation Solution
A bursting device featuring a shear pin with a predetermined breaking point, a bursting cap with a flange section and peripheral seal, and securing elements that ensure reliable and controlled pressure relief, preventing uncontrolled rupture and damage, while being easy to assemble, replace, and resistant to external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard paper disc covered by metal foil is used as a bursting disc, then protection from aggressive oil is achieved, but assembly errors cause sealing failures and the structure becomes complex
Solution Approach 1:
The invention extracts the fragile hard paper disc from the bursting disc assembly and replaces it with a robust bursting cap made of metal or plastic. The bursting function is transferred to a shear pin with a predetermined breaking point, while the bursting cap serves purely as a protective cover and sealing element. This separation eliminates the sealing problems associated with metal foil-covered paper discs while maintaining protection from aggressive oil.
Solution Approach 2:
The shear pin is designed as a disposable component with a predetermined breaking point that fails at a specific pressure threshold. After triggering the pressure relief mechanism, the shear pin is replaced while the bursting cap and housing remain reusable. This approach simplifies maintenance and ensures reliable pressure relief without the complexity of reusable fragile bursting discs.
2Reliability
If a hard paper disc is used as a bursting disc, then pressure relief is achieved, but sensitivity to external forces causes accidental destruction during maintenance
Solution Approach 1:
The invention extracts the pressure-sensitive bursting function from the protective cover by introducing a shear pin with a predetermined breaking point. The bursting cap becomes a robust protective element that is not sensitive to external forces, while the shear pin remains protected within the housing until triggered by excessive internal pressure.
Solution Approach 2:
The shear pin is designed with a predetermined breaking point that acts as a safety threshold. Normal maintenance forces or external influences cannot trigger the pressure relief mechanism because the shear pin remains intact under these conditions. Only when internal pressure exceeds the predetermined threshold does the shear pin break, ensuring that accidental destruction during maintenance is prevented.
3Reliability
If a bursting cap with flange section and peripheral seal is used, then controlled pressure relief is achieved, but assembly complexity increases
Solution Approach 1:
The invention merges the sealing function with the bursting cap by integrating a peripheral seal directly into the cap structure. The flange section provides both mechanical support and sealing surfaces, combining multiple functions into a single component. This reduces the number of separate sealing elements and simplifies assembly compared to traditional bursting disc designs.
Solution Approach 2:
The bursting device is segmented into distinct functional components: the bursting cap with integrated seal, the shear pin with predetermined breaking point, and the housing with receiving block. This segmentation allows each component to be optimized for its specific function and facilitates easy assembly and replacement, particularly during maintenance when the shear pin can be quickly replaced without removing the bursting cap.
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 solution provides a durable, cost-effective, and reliable pressure relief mechanism that prevents false triggering and ensures controlled pressure release, reducing maintenance costs and enhancing safety during operation and maintenance.
Implementation Method 1
The shear pin (8) has a predetermined breaking point (8C)
Implementation Method 2
A compression spring can be arranged in the direction of the axis of the opening between the flange section of the bursting cork and the wall of the high-voltage device
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a bursting device (1) for a high-voltage device (2). The bursting device (1) is suitable in particular for on-load tap changers or high-voltage transformers filled with a filling medium such as gas or oil. The bursting device (1) according to the invention has a bursting cork (3) with support blocks (7) arranged on the inner surface (3B). A shear pin (8) is in arranged in each receiving block (7), said shear pin being divided into a first portion (8A) and a second portion (8B). The first portion (8A) of the shear pin (8) protrudes into the receiving block (7). The second portion (8B) of the shear pin (8) is arranged below the circumferential edge (9) of an opening (5) of the high-voltage device (2).