Underarm Vacuum Break Switch With Visible Air Gap and SF6-Free Insulation
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Solution Overview
Problem
Current vacuum disconnect switches in electrical power transmission systems face issues due to the fragility of porcelain ceramic components and the environmental impact of SF-6 gas, which is being phased out.
Innovation Solution
The development of an underarm overhead powerline vacuum break switch configuration that includes a stationary post insulator, rotating spindle insulator, and phase base cross bar, utilizing a vacuum switch and disconnect blade with a shock absorber to reduce kinetic energy and enhance safety, along with a visual indicator for operational status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If porcelain ceramic vacuum bottle disconnect switches are used, then reduced sparking is achieved, but fragility of the porcelain ceramic components occurs
Solution Approach 1:
The patent replaces traditional porcelain ceramic vacuum bottles with composite material constructions including fiberglass reinforced plastic housings and aluminum components. This substitution maintains the vacuum seal functionality while eliminating the fragility of porcelain, allowing the disconnect switch to achieve reduced sparking without the weakness of ceramic materials.
Solution Approach 2:
The invention uses more durable, replaceable components such as the aluminum vacuum chamber and fiberglass housing that can withstand mechanical stress and environmental conditions better than porcelain. These components are designed to be robust and long-lasting, reducing maintenance needs and improving overall reliability of the disconnect switch.
2Reliability
If SF-6 gas is used for insulation, then electrical insulation is improved, but environmental harm occurs leading to discontinuation under new regulations
Solution Approach 1:
The patent completely removes SF-6 gas from the disconnect switch design by using a vacuum-sealed chamber instead. The vacuum environment provides electrical insulation without requiring any gaseous medium, thereby eliminating the environmental harm associated with SF-6 gas while maintaining reliable electrical insulation performance.
Solution Approach 2:
The invention creates an inert vacuum environment within the disconnect switch chamber to provide electrical insulation. This vacuum atmosphere replaces the need for SF-6 gas, offering the same insulating properties without the environmental drawbacks, and allows the switch to operate safely without harmful greenhouse gases.
3Productivity
If traditional vacuum disconnect switches are used, then power interruption is achieved, but safety risks to wildlife from electrical shock remain
Solution Approach 1:
The patent introduces a disconnect blade as an intermediary component that provides a visible physical barrier between energized conductors. This blade, when in the closed position, clearly indicates to wildlife and workers that the circuit is active, while also providing additional insulation. When opened, it creates a visible air gap that signals de-energization, reducing electrical shock risks to wildlife.
Solution Approach 2:
The disconnect blade incorporates visual indicators such as colored markings or reflective surfaces that change appearance based on the switch position. These visual cues make the operational state of the switch more apparent to wildlife and personnel, helping to prevent accidental contact with energized components and reducing electrical shock hazards.
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
This configuration provides a safer, more reliable, and environmentally friendly solution by reducing the risk of electrical shock to wildlife and eliminating the need for SF-6 gas, while ensuring efficient power line disruption and restoration.
Implementation Method 1
vacuum switch
Implementation Method 2
disconnect blade with a shock absorber to reduce kinetic energy
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.