Underarm Vacuum Break Switch Shock Absorber for Closing Impact
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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 arrangement that includes a stationary post insulator, a rotating spindle insulator, and a phase base cross bar, utilizing a vacuum switch and disconnect blade configuration to ensure electrical safety and efficiency, with a shock absorber and open/close indicator for enhanced performance.
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 divides the vacuum disconnect switch into separate modular components: a vacuum switch assembly and a disconnect blade assembly. This segmentation allows each component to be optimized independently - the vacuum switch provides arc suppression while the disconnect blade provides visible isolation, eliminating the need for fragile porcelain ceramic bottles to serve both functions.
Solution Approach 2:
The patent extracts the vacuum switching mechanism from the traditional porcelain ceramic vacuum bottle structure. The vacuum switch assembly is separated and mounted independently on cross-arms, allowing the use of more durable materials and designs while maintaining the arc suppression benefits of vacuum technology.
2Reliability
If SF-6 gas insulation is used in vacuum disconnect switches, then electrical insulation is improved, but environmental harm occurs
Solution Approach 1:
The patent changes the insulation medium from SF-6 gas to vacuum environment. By utilizing the vacuum chamber inherent in vacuum interrupter technology, the system achieves superior electrical insulation without requiring any gaseous insulator, thereby eliminating SF-6 emissions and environmental harm.
Solution Approach 2:
The patent employs a vacuum environment as the inert atmosphere for electrical insulation. The vacuum chamber provides an inert, non-conductive environment that prevents arc formation and maintains electrical insulation without requiring any atmospheric gases, including environmentally harmful SF-6.
3Reliability
If traditional vacuum bottle disconnect switches are used, then electrical continuity is achieved, but visibility of switch state for safety is insufficient
Solution Approach 1:
The patent incorporates visual indicators on the disconnect blade assembly that change appearance based on the switch state. The disconnect blade's position and associated indicators provide clear visual differentiation between connected and disconnected states, enhancing safety and detectability.
Solution Approach 2:
The patent introduces a disconnect blade as an intermediary component between the vacuum switch and the power lines. This blade provides a visible, physical representation of the electrical connection state, serving as a mediator that translates the internal vacuum switch state into externally observable information for safety verification.
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 personnel, while allowing for efficient power line management and visualization of switch states, thus addressing the limitations of existing vacuum disconnect switches.
Implementation Method 1
a shock absorber and open/close indicator mounted to the actuator mechanism. The shock absorber reduces the moving mass and kinetic energy of the mechanism linkage during the closing event
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.