Vacuum Parallel Switch Structure for High-Voltage Insulation Stability
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Solution Overview
Problem
Existing vacuum parallel switch devices for environmentally-friendly ring main units face challenges with weak insulation and high risk of breakdown at higher voltage levels, particularly in 24 kV and above, due to undesirable electric fields and rotary isolating switch structures.
Innovation Solution
A vacuum parallel switch device incorporating a direct-acting isolating switch and a parallel vacuum arc-extinguishing chamber, utilizing a linear motion mechanism with a rotating conductor assembly and cam transmission for opening and closing, ensuring stable insulation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotary isolating switch with a vacuum arc-extinguishing chamber is used, then the device achieves a small volume and low cost, but the electric field becomes undesirable and insulation weakens at higher voltage levels
Solution Approach 1:
The patent inverts the conventional rotary isolating switch structure by using a linear motion isolating switch instead. The moving isolating contact moves linearly along the bus rather than rotating, which fundamentally changes the electric field distribution and eliminates the undesirable electric field concentrations associated with rotary structures at higher voltage levels.
Solution Approach 2:
The patent segments the switch device into distinct functional components: a linear motion isolating switch for isolation functions and a parallel vacuum arc-extinguishing chamber for breaking functions. This segmentation allows each component to be optimized independently, with the linear motion structure providing better insulation characteristics while the vacuum chamber handles arc extinction.
2Reliability
If a linear motion mechanism with cam transmission is used, then the structure becomes compact and insulation is stabilized, but the device complexity increases
Solution Approach 1:
The patent merges the isolating switch and vacuum arc-extinguishing chamber into a single integrated device with shared components. The linear motion mechanism drives both the isolating contact and the vacuum chamber simultaneously, consolidating functions into one compact structure rather than separate devices.
Solution Approach 2:
The linear motion mechanism serves multiple functions: it drives the moving isolating contact for isolation, operates the parallel vacuum arc-extinguishing chamber for breaking, and coordinates both operations through a single actuation system. This multi-functionality reduces the need for separate mechanisms while maintaining insulation stability.
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 device provides improved insulation and reduces the risk of breakdown, achieving a simple and compact structure suitable for higher voltage levels with enhanced reliability and efficiency.
Implementation Method 1
a parallel vacuum arc-extinguishing chamber connected to an other end of the bus
Implementation Method 2
the insulating rotating member, the rotating support shaft, and the moving end of the parallel vacuum arc-extinguishing chamber cooperate by way of cam transmission
Data Source
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AI summary
The present invention discloses a vacuum parallel switch device, including: a main electrically-conductive loop, including an incoming line terminal bus, a bus connected to the incoming line terminal bus, a fixed isolating contact connected to an end of the bus, and a moving isolating contact assembly mating with the fixed isolating contact; and a vacuum parallel loop, including the incoming line terminal bus, the bus connected to the incoming line terminal bus, and a parallel vacuum arc-extinguishing chamber connected to an other end of the bus, where a rotating conductor assembly is connected to a moving end of the parallel vacuum arc-extinguishing chamber through a flexible connection, the rotating conductor assembly is connected to a lead-out conductor of the moving isolating contact assembly, and the moving end of the parallel vacuum arc-extinguishing chamber is driven through an insulating rotating member to implement opening or closing.