Vacuum Bottle Housing With Ice Shield for Underarm Switch Safety
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Solution Overview
Problem
Existing vacuum disconnect switches face issues with fragility of porcelain ceramic and the use of environmentally harmful SF-6 gas, which are being phased out due to environmental regulations.
Innovation Solution
The development of underarm overhead powerline vacuum break switches featuring a stationary post insulator and rotating spindle insulator, connected to a phase base cross bar, with a vacuum switch arrangement that includes a powerline pathway and a disconnect blade, ensuring no electrical continuity when the switch is broken, and utilizing a vacuum bottle housing encapsulated in an ice and water shield to protect the vacuum bottle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porcelain ceramic vacuum bottles are used in disconnect switches, then electrical insulation and vacuum sealing are achieved, but the porcelain ceramic becomes fragile and prone to breaking during operation
Solution Approach 1:
The patent applies composite materials by combining porcelain ceramic with a fiberglass reinforcement structure. The fiberglass provides mechanical strength and flexibility to the vacuum bottle, preventing the fragility issues of pure porcelain ceramic while maintaining the electrical insulation and vacuum sealing properties. This composite construction allows the vacuum bottle to withstand operational stresses without breaking.
2Reliability
If SF-6 gas is used for insulation in vacuum disconnect switches, then electrical insulation performance is improved, but environmental harm increases leading to regulatory phase-out
Solution Approach 1:
The patent applies parameter changes by replacing SF-6 gas with nitrogen gas in the vacuum bottle insulation system. This substitution maintains the required electrical insulation performance while eliminating the environmental harm associated with SF-6 gas. The nitrogen gas provides adequate dielectric strength for vacuum disconnect switch operation without being subject to environmental regulations or phase-out requirements.
3Device complexity
If a simple vacuum switch design is used, then device complexity is reduced, but safety against electrical shock to wildlife is insufficient
Solution Approach 1:
The patent applies the intermediary principle by introducing a fiberglass reinforcement structure as a mediator between the vacuum bottle and the external environment. This fiberglass layer acts as an additional protective barrier that prevents electrical shock to wildlife (such as birds) while maintaining the simplicity of the overall switch design. The fiberglass serves as both structural reinforcement and safety protection without significantly increasing device complexity.
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 and more environmentally friendly switch arrangement that prevents electrical continuity when open, reduces the risk of electrical shock to wildlife, and uses nitrogen gas instead of SF-6, enhancing safety and compliance with environmental regulations.
Implementation Method 1
a vacuum bottle housing encapsulated in an ice and water shield to protect the vacuum bottle
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.