Underarm Vacuum Break Switch With Visual Gap and Shock Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vacuum disconnect switches in electrical power transmission systems are fragile and use environmentally harmful SF-6 gas, which is being phased out due to environmental regulations, and they do not adequately address safety concerns for wildlife and maintenance personnel.
Innovation Solution
The development of an underarm overhead powerline vacuum break switch with a stationary post insulator and rotating spindle insulator connected to a phase base cross bar, featuring a vacuum switch and disconnect blade that creates an air gap when open, ensuring electrical discontinuity and using a shock absorber to reduce kinetic energy during closure, along with a visual indicator for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vacuum bottle disconnect switches are used, then electrical switching function is achieved, but the porcelain ceramic is fragile and SF-6 gas is environmentally harmful
Solution Approach 1:
The patent extracts and removes the harmful SF-6 gas from the vacuum bottle disconnect switch, replacing it with alternative insulation methods that do not rely on environmentally harmful gases. The switching function is achieved through mechanical disconnection and alternative insulation structures rather than SF-6 gas containment.
Solution Approach 2:
The patent changes the physical and chemical parameters of the insulation medium by replacing SF-6 gas with alternative materials or vacuum conditions. This parameter change eliminates the environmental harm while maintaining the electrical insulation properties necessary for reliable switching operation.
2Reliability
If vacuum bottle disconnect switches are used, then electrical switching is achieved, but the porcelain ceramic structure is fragile during contact switch operation
Solution Approach 1:
The patent segments the disconnect switch structure into separate functional components, isolating the mechanical switching elements from the fragile porcelain ceramic body. This segmentation allows the switching operation to occur in a more resilient structural configuration, reducing stress on the porcelain ceramic during contact make and break operations.
Solution Approach 2:
The patent incorporates cushioning elements and shock-absorbing mechanisms before the contact switch operation to reduce mechanical stress on the porcelain ceramic structure. This beforehand cushioning prevents sudden impacts and vibrations from compromising the fragile ceramic body during switching operations.
3Reliability
If disconnect switches are used to interrupt power, then electrical safety is improved, but wildlife and maintenance personnel safety concerns remain
Solution Approach 1:
The patent introduces visual indicators and intermediate safety features that mediate between the electrical switching function and the safety of wildlife and maintenance personnel. These intermediaries provide clear visual confirmation of the switch state and incorporate design elements that reduce direct exposure to electrical hazards for both personnel and wildlife in the vicinity.
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 safer, more reliable, and environmentally friendly switching mechanism that prevents electrical continuity when open, reduces the risk of damage to electrical contacts, and enhances safety for both wildlife and maintenance personnel by visually indicating the switch's state.
Implementation Method 1
a shock absorber to reduce kinetic energy during closure
Implementation Method 2
creates an air gap when open, ensuring electrical discontinuity
Data Source
AI summary
An underarm gang operated vacuum break switch (underarm switch) has an electrically live portion under a mounting arm, which provides advantages over the standard vacuum break switch, which have the electrically live portion above the mounting arm. Because the non-electrified mounting arm is above the electrified portion, the underarm switch is safer for perching birds and other wildlife. The nature of the underarm switch also provides other benefits including a disconnect blade that when opened creates a visual gap to ensure electrical discontinuity along with a safety locking arm tied to deactivating the underarm switch. Adding to the safety measures is a visual indicator that shows an electrician when the switch is live and safe to open the disconnect blade. Other safety measures include a shock absorber assembly and inertia slowing mass protecting electrical contacts within the vacuum break switch from failing.